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    <link href="https://www.emc-direct.de/en/the-company/news-technical-articles/technical-contributions/?sAtom=1" rel="self" type="application/atom+xml" />
    <author>
        <name>EMC-direct</name>
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    <title>Blog / Atom Feed</title>
    <id>https://www.emc-direct.de/en/the-company/news-technical-articles/technical-contributions/?sRss=1</id>
    <updated>2026-05-20T10:30:49+02:00</updated>
    
        <entry>
            <title type="text">PV system cabling: Ensure performance through correct cabling</title>
            <id>https://www.emc-direct.de/en/the-company/news-technical-articles/technical-contributions/pv-system-cabling-ensure-performance-through-correct-cabling</id>
            <link href="https://www.emc-direct.de/en/the-company/news-technical-articles/technical-contributions/pv-system-cabling-ensure-performance-through-correct-cabling"/>
            <summary type="html">
                <![CDATA[
                
                                            Bifacial modules are one of the increasingly widespread technologies in modern solar systems in Germany and Europe. However, their ability to convert sunlight into electricity on both the front and back of the module significantly increases the technical requirements for cable...
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            </summary>
            <content type="html">
                <![CDATA[
                 
 Content of this article: 
 
  1. Basics of PV system cabling  
  2. Protective devices for safe PV systems  
  3. Planning the cable routes  
  4. Step-by-step guide to cabling  
  5. Fault prevention during cabling  
 
 
 PV system cabling: Ensure performance through correct cabling 
 The correct cabling of a PV system is crucial for the safety, efficiency and service life of your photovoltaic system. From choosing the right cable cross-section to connecting the modules - every step has an impact on performance. Find out below how to wire your PV modules safely and professionally and avoid typical mistakes. 
   Make an inquiry now   
 The basics of PV system cabling 
 Before you start installing your PV modules, it is important to understand the basic cabling components and standards. Correct planning reduces subsequent costs and increases the efficiency of your solar system. 
 Important cabling components 
 The cabling of a PV system comprises several essential parts: 
 
 PV modules: Generate direct current (DC) from sunlight. 
 Solar cables: Special cables for high UV and temperature resistance. 
 Inverter: Converts direct current into alternating current (AC) for the power grid. 
 Feed-in point: Connection to the domestic grid or electricity supplier. 
 Cable ducts &amp;amp; installation pipes: Protect cables from the weather, mechanical stress and animal bites. 
 
 Protective devices for safe PV systems 
 In addition to correct cabling, protective components are essential for the safe operation of your photovoltaic system: 
 
 DC disconnectors (load-break switches): Enables voltage-free switching of the DC side between modules and inverter - essential for maintenance work and in the event of fire. Mandatory according to DIN VDE 0100-712. 
 Overvoltage protection type 1 + type 2: Protects the system from lightning strikes and overvoltages from the grid. Type 1 is installed on the house connection, type 2 on the inverter (in accordance with DIN VDE 0100-443 and 0100-534). 
 Circuit breaker (AC side): Protects the AC side between the inverter and the feed-in point against overload and short circuit. 
 RCD: Protects against dangerous residual currents - particularly important for PV systems with contact to earthed components. 
 Cable protection with cable glands &amp;amp; conduits: EMC-direct offers UV-resistant cable glands (M16-M32, IP68) and cable protection conduits to protect against mechanical damage, weather and rodents. 
 
   Contact us now   
 DC vs. AC side 
 
 
 
  Characteristic  Direct current side (DC)  Alternating current side (AC)  
 
 Range 
 PV modules to inverter 
 Inverter to feed-in point 
 
 
 Cable type 
 Special solar cable (UV &amp;amp; weather resistant) 
 Standard NYM cables or underground cables 
 
 
 Material 
 Mostly finely stranded copper cables, tinned 
 Copper or aluminum conductors 
 
 
 Voltage 
 Typically 600-1,000 V DC (residential buildings) 
 Low voltage (230V / 400V AC) 
 
 
 Standards 
 DIN VDE 0100-520 &amp;amp; DIN VDE 0100-712 
 DIN VDE 0100 Part 410 &amp;amp; 540 
 
 
 
 
 Standards &amp;amp; guidelines 
 Clear safety and quality standards apply to PV system cabling: 
 
 DIN VDE 0100-520: Electrical installations of PV systems, protection against electric shocks. 
 DIN VDE 0100-540: Requirements for cables, lines and protective measures for direct current. 
 Earthing obligation: Protection against overvoltages and electric shocks. 
 Protective measures: Cables must be UV-resistant, protected against animal bites and correctly laid. 
 
 
  Tip:  Proper earthing and the use of tested solar cables reduce the risk of performance losses and increase the service life of your photovoltaic system. 
 
 PV system cabling - planning the cable routes 
 Careful planning of the cable routes is crucial in order to minimize power losses, ensure safety and optimally connect the modules to the inverter. 
 Cable routes &amp;amp; laying 
 
 Cables should have the shortest possible routes from the module to the inverter. 
 Avoid sharp-edged points and external influences such as heat or moisture. 
 Use cable ducts or installation pipes from EMC-direct to protect the cables mechanically. 
 
 
 Checklist for safe cable routing: 
 
 No unnecessary bends or twists. 
 Lay cables so that water can run off. 
 Protect against rodents and mechanical damage. 
 
 
 Cable length &amp;amp; cross-section 
 Selecting the right cable length and cross-section is crucial to avoid power losses. Longer cables require larger cross-sections. 
 
 
 
  Amperage (A)  Cable length up to 10 m  Cable length up to 20 m  Note  
 
 
 
 8 A 
 2.5 mm² 
 4 mm² 
 For small strings (4-8 modules) 
 
 
 16 A 
 4 mm² 
 6 mm² 
 For medium strings (8-12 modules) 
 
 
 25 A 
 6 mm² 
 10 mm² 
 For large strings (12+ modules) 
 
 
 
 
 
  Tip:  Shorter cable runs reduce power losses, increase efficiency and reduce material costs. 
 
   Find out more now   
 Optimal arrangement of the PV modules 
 
 Series connection: Increases voltage, but voltage failure possible in the event of a fault. 
 Parallel connection: Increases current, reduces the risk of failure of individual modules. 
 Plan strings correctly: Same modules in series, same strings in parallel to achieve maximum output. 
 
 Step-by-step guide to PV system cabling 
 Correct PV system cabling is crucial to ensure the safety, efficiency and service life of your photovoltaic system. Proceed as follows: 
 
  Planning the cable routes:  Plan the cable routes before installation. Make sure that DC and AC cables run separately. 
  Selecting the correct cable cross-section:  Calculate the appropriate cross-section based on the current and cable length. 
  Mounting the solar modules:  Attach the modules securely to the substructure. 
  Connecting the PV modules (strings):  Connect the modules and pay meticulous attention to the polarity. 
  Earthing &amp;amp; protective measures:  All metal parts and cable routes must be properly earthed. 
  Connection to the inverter:  Route the cables to the inverter and check all safety distances. 
  Testing &amp;amp; commissioning:  Measure voltages before switching on for the first time. 
 
 Fault prevention during cabling 
 
 
 
  Fault  Risk  Solution EMC-direct  
 
 
 
 Incorrect polarity of the modules 
 Short circuit, loss of power 
 Marking and check before connection 
 
 
 Cable too thin 
 Voltage loss, overheating 
 Select suitable cross-section 
 
 
 Cable too long 
 Power loss, unclear 
 Calculate optimum cable lengths 
 
 
 Insufficient earthing 
 Electric shock, insurance problems 
 Have a specialist company check the earthing 
 
 
 Improper installation 
 Loss of performance 
 Installation according to the manufacturer&#039;s instructions 
 
 
 
 
 
  Tip:  Document every step of the wiring and keep photos or plans of the cable routes. This will make subsequent maintenance and troubleshooting easier. 
 
 Conclusion: Fault-free PV system cabling for maximum performance 
 Proper cabling of PV systems is the basis for smooth operation. Incorrect cable cross-sections, excessively long cable runs or improper earthing lead to power losses, safety risks and increased maintenance costs. 
   Make an inquiry now   
 Do you still have questions about PV system cabling? 
  Which cable types are suitable for cabling photovoltaic systems?   Specially insulated solar cables that are UV and weather-resistant are used for PV system cabling. Copper conductors are common as they offer low line losses. 
  How do I choose the right cable cross-section for my PV system?   The cross-section depends on the current, the length of the paths and the permissible power loss. The calculation should be carried out in accordance with DIN VDE 0100-520. 
  Why is earthing necessary when cabling PV systems?   Earthing protects people from electric shocks and the system from overvoltage damage. 
  What is the maximum cable length in a PV system?   There is no fixed limit, but the voltage drop on the DC side should ideally be limited to between 1-3 %. 
 
 
 Author: Thaddäus Nagy 
 Managing Director of EMC-direct 
 Thaddäus Nagy is Managing Director of EMC-direct and is responsible for the strategic direction and further development of the company in the field of electrical connection technology and cable management. 
 
       
 
 &amp;nbsp; 
  Free white paper on the safe operation of systems  
 In order to raise awareness of the high quality requirements for the assembly and electrical installation of photovoltaic systems, experts have produced the white paper &quot;Knowing - and avoiding - common causes of damage to photovoltaic systems&quot; on behalf of EMC-direct. 
   Download here free of charge   
 &amp;nbsp; 
  Source &amp;amp; further information:   www.photovoltaik.eu  
                ]]>
            </content>

                            <updated>2026-04-20T10:15:00+02:00</updated>
                    </entry>

    
    
        <entry>
            <title type="text">Drainage clips against soiling: increased yield through optimized module drai...</title>
            <id>https://www.emc-direct.de/en/the-company/news-technical-articles/technical-contributions/drainage-clips-against-soiling-increased-yield-through-optimized-module-drainage</id>
            <link href="https://www.emc-direct.de/en/the-company/news-technical-articles/technical-contributions/drainage-clips-against-soiling-increased-yield-through-optimized-module-drainage"/>
            <summary type="html">
                <![CDATA[
                
                                            Soiling can significantly impair the performance of your PV system. Even slight soiling leads to a loss of efficiency and can reduce the service life of the modules. Drainage clips offer a practical solution here.
                                        ]]>
            </summary>
            <content type="html">
                <![CDATA[
                 
 Content of this article: 
 
  1. What is soiling and why is it relevant?  
  2. How drainage clips work  
  3. Advantages at a glance  
  4. Installation and application instructions  
  5. Frequently asked questions about drainage clips  
 
 
 Drainage clips against soiling: increased yield through optimized module drainage 
 Soiling can significantly impair the performance of your PV system. Even slight soiling leads to a loss of efficiency and can reduce the service life of the modules. Drainage clips offer a practical solution here: they improve water drainage, prevent the accumulation of dirt and support the self-cleaning of the modules. With this measure, yield losses can be minimized and maintenance and cleaning costs can be sustainably reduced. 
   Make an inquiry now   
 What is soiling and why is it relevant? 
 Soiling describes the deposition of dirt particles on the surface of solar modules. This soiling acts as a barrier to sunlight and can reduce the yield of a PV system by 3 to 5 % per year. In addition to efficiency losses, they increase the risk of hotspots. Drainage clips specifically address this problem by reducing the accumulation of dirt on the module frame and improving self-cleaning by rainwater. 
 How drainage clips work 
 Drainage clips are small but effective aids that are attached along the edges of the module. They drain rainwater efficiently over the edge of the frame, prevent the formation of waterlogging and thus reduce the accumulation of dirt particles. 
  Important properties:  
 
  Self-cleaning effect : dirt is automatically removed when it rains. 
  Simple installation : Can be retrofitted without special tools, compatible with standard frame profiles. 
  UV resistance : Made of UV-stabilized plastic for a long service life. 
 
 Advantages of drainage clips at a glance 
 
  Reduction of soiling : Less dirt deposits lead to more stable yields. 
  Minimized maintenance : Longer intervals between cleaning save costs. 
  Prevention of waterlogging : No water accumulation at the lower module edges. 
  High cost-effectiveness : Low investment costs are often amortized with just one cleaning. 
 
   Find out more now   
 Installation and application instructions 
 According to the recommendations of the IEA PVPS, the inclination of PV modules should be at least 10° to allow water to drain off. Drainage clips are a decisive support, especially for flat installations (e.g. on carports or flat industrial roofs). 
 
 Important application limits 
 The clips cannot work on a slope of exactly 0° (completely flat installation) as there is no gradient for water drainage. In addition, clips do not replace basic cleaning in the event of extreme incrustation, but merely increase the intervals between cleaning. 
 
 Conclusion: More yield through simple solutions 
 Soiling is one of the underestimated factors influencing the profitability of PV systems. Drainage clips offer a simple way to support the natural self-cleaning effect. The result is more stable yields and a more even load on the modules. 
   Make an inquiry now  
 Frequently asked questions about drainage clips 
  When is it particularly worthwhile using them?   Particularly for flat pitched systems (&amp;lt; 15°) in dusty or pollen-rich environments (e.g. agriculture), where typical dirt marks form on the lower module frame. 
  Can the clips be retrofitted?   Yes, the clips are designed for easy retrofitting. They are attached to the existing module frame without tools. 
  Which module types are they suitable for?   They are compatible with almost all framed standard modules. Due to their design, they are not suitable for frameless glass-glass modules. 
 
 
 Author: Thaddäus Nagy 
 Managing Director of EMC-direct 
 Thaddäus Nagy is responsible for strategic development at EMC-direct in the field of connection technology. With his many years of experience in the photovoltaic industry, he focuses on practical solutions for yield optimization and operational reliability of solar systems. 
 
       
 
 &amp;nbsp; 
  Free white paper on the safe operation of photovoltaic systems  
 Experts from EMC-direct have developed the white paper &quot;Knowing - and avoiding - common causes of damage to photovoltaic systems&quot; to raise awareness of the highest quality standards. 
   Download now free of charge   
 &amp;nbsp; 
  Source &amp;amp; further information:   www.photovoltaik.eu  
                ]]>
            </content>

                            <updated>2026-04-19T11:15:00+02:00</updated>
                    </entry>

    
    
        <entry>
            <title type="text">PA12 and stainless steel: materials for durable photovoltaic installations</title>
            <id>https://www.emc-direct.de/en/the-company/news-technical-articles/technical-contributions/pa12-and-stainless-steel-materials-for-durable-photovoltaic-installations</id>
            <link href="https://www.emc-direct.de/en/the-company/news-technical-articles/technical-contributions/pa12-and-stainless-steel-materials-for-durable-photovoltaic-installations"/>
            <summary type="html">
                <![CDATA[
                
                                            The service life of a photovoltaic system depends not only on the quality of the solar modules, but also to a large extent on the mounting and connection materials used. Find out more here.
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            </summary>
            <content type="html">
                <![CDATA[
                 
 Content of this article: 
 
  1. Polyamide 12 (PA12): The specialized plastic  
  2. Stainless steel fasteners: Maximum security  
  3. Material comparison: PA12 vs. stainless steel  
  4. Advantages of combining PA12 and stainless steel  
  5. The decisive interaction of the components  
 
 
 PA12 and stainless steel: materials for durable photovoltaic installations 
 The service life of a photovoltaic system depends not only on the quality of the solar modules, but also to a large extent on the fastening and connection materials used. Plastic parts made of PA12 and stainless steel components have proven to be particularly reliable in practice, as they combine UV stability, corrosion protection and mechanical stability. When planning and installing professional PV systems, these material properties should be taken into account at an early stage to ensure long-term operational reliability. 
   Make an inquiry now   
 Polyamide 12 (PA12): The specialized plastic for the solar industry 
 In photovoltaic installation, it is often wrongly assumed that UV-stabilized PA6.6 is sufficient for all outdoor applications. However, practice shows that UV radiation is only one of many stress factors. Polyamide 12 (PA12) has established itself as a technically superior solution, as it eliminates specific weak points of standard plastics. 
  Molecular advantages and low water absorption   Hygroscopicity is a critical factor for the durability of plastics. PA12 has a modified molecular structure with extremely low water absorption. This means that the material remains impact-resistant and flexible without becoming brittle, even in extremely dry conditions or long periods of frost. 
  Resistance to zinc chloride and galvanic corrosion   An often underestimated risk when using standard cable ties is chemical incompatibility with the mounting systems. Many substructures are made of galvanized steel. In combination with moisture, salts or chloride-containing air pollutants, zinc chloride can form. PA12 is one of the few high-quality plastics with complete zinc chloride resistance. 
 Stainless steel fasteners: Maximum safety for extreme environments 
 In photovoltaic installations, there are scenarios in which even high-performance plastics such as PA12 reach their physical limits. Wherever extreme mechanical loads, aggressive atmospheric conditions or strict fire protection requirements prevail, stainless steel fasteners are the technical spearhead. 
  Corrosion protection near the coast and offshore installations   Installations in maritime environments are permanently exposed to salt. This chloride-containing atmosphere drastically accelerates corrosion processes. While conventional steels fail here within a short time, stainless steels of the V2A (304) or V4A (316) grades offer long-lasting protection. 
  Fire protection and mechanical limit loads   Stainless steel fasteners are non-combustible and do not contribute to the spread of fire in the event of a thermal incident. They also have superior tensile strength - ideal for extreme wind loads or large cable cross-sections with a high dead weight. 
 Material comparison: PA12 vs. stainless steel 
 
 
 
 
  Criterion  
  PA12 (high-performance)  
  Stainless steel (V2A/V4A)  
 
 
  UV stability  
 Very high (solar-specific) 
 Excellent 
 
 
  Water absorption  
 Very low (approx. 0.8 %) 
 Zero 
 
 
  Zinc chloride resistance  
 Fully immune 
 Fully immune 
 
 
  Service life (outdoor)  
 Approx. 25 years 
 Over 30 years 
 
 
  Fire protection (UL 94)  
 V2 / HB 
 Non-flammable 
 
 
 
 
 Advantages of combining PA12 and stainless steel 
 The combination of both materials creates synergies for fastening solar modules: 
 
  Clamping systems : PA12 clamps with stainless steel screws ensure a tight fit with simultaneous flexibility. 
  Load distribution : Stainless steel brackets carry the mechanical load, while PA12 clips dampen vibrations. 
  Corrosion-free : Material separation minimizes the risk of galvanic corrosion. 
  Efficiency : PA12 components can often be mounted on stainless steel brackets without tools. 
 
   Make an inquiry now   
 Components alone are not enough - interaction is crucial 
 A durable system can only be created if the components are used correctly: 
 
 Combine PA12 ties with PA12 or coated stainless steel clips. 
 If necessary, use stainless steel ties with insulating underlays. 
 Do not install uncoated metal clips directly on aluminum profiles. 
 Always apply edge protection to all sharp edges. 
 
 Operational safety starts with planning 
 
  Determine corrosivity class  - in accordance with ISO 9223 (C1-CX). 
  Define material guidelines : PA12 for C3-C5; stainless steel for C5-CX. 
  System check : Check chemical compatibility between the binder and the mounting rail. 
  Installation quality : Observe preload and ensure water drainage. 
 
 Conclusion: Durable fastening for PV modules 
 The combination of PA12 and stainless steel combines mechanical stability with long-lasting weather resistance. Choosing these materials reduces maintenance costs and secures the return on investment for decades. 
   Enquire now   
 Frequently asked questions about PA12 and stainless steel 
  When is stainless steel essential for cable fastening?   In corrosive environments such as near the coast or in agriculture, as well as in strict fire protection regulations that require non-combustible materials. 
  Can PA12 clamps be used for all module types?   Yes, they are available in different versions and are particularly gentle on bifacial and standard glass-glass modules. 
  Do PA12 clamps require regular maintenance?   They are largely maintenance-free. However, a visual inspection as part of normal system maintenance is recommended. 
 
 
 Author: Thaddäus Nagy 
 Managing Director of EMC-direct 
 As Managing Director, Thaddäus Nagy is responsible for the strategic direction and product management at EMC-direct. With his many years of experience in photovoltaics and connection technology, he ensures that installers always have access to innovative, high-quality solutions. His focus is on the development of practical products for maximum safety and efficiency. 
 
       
 
 &amp;nbsp; 
  Free white paper on the safe operation of systems  
 EMC-direct&#039;s specialist authors have created the white paper &quot;Knowing - and avoiding - common causes of damage to photovoltaic systems&quot; to raise awareness of quality standards. 
   Download the whitepaper now   
 &amp;nbsp; 
  Source &amp;amp; further information:   www.photovoltaik.eu  
                ]]>
            </content>

                            <updated>2026-04-14T10:15:00+02:00</updated>
                    </entry>

    
    
        <entry>
            <title type="text">Clamp bifacial modules correctly: Optimal installation for bifacial photovolt...</title>
            <id>https://www.emc-direct.de/en/the-company/news-technical-articles/technical-contributions/clamp-bifacial-modules-correctly-optimal-installation-for-bifacial-photovoltaic-modules</id>
            <link href="https://www.emc-direct.de/en/the-company/news-technical-articles/technical-contributions/clamp-bifacial-modules-correctly-optimal-installation-for-bifacial-photovoltaic-modules"/>
            <summary type="html">
                <![CDATA[
                
                                            In Germany and Europe, bifacial modules are one of the increasingly widespread technologies in the field of modern solar systems. However, their ability to convert sunlight into electricity on both the front and back of the module significantly increases the technical requirem...
                                        ]]>
            </summary>
            <content type="html">
                <![CDATA[
                 
 Content of this article: 
 
  1. What are bifacial modules?  
  2. Why classic fasteners are reaching their limits  
  3. Edge clips vs. wire clips  
  4. Cable routing for landscape systems  
  5. Avoiding errors during cabling  
  6. The challenge: frame edges less than 5 mm  
  7. S-shaped wire clips as the standard solution  
  8. Frequently asked questions about clamping  
 
 
 Clamping bifacial modules correctly: Optimal installation for bifacial photovoltaic modules 
 Bifacial modules are one of the increasingly widespread technologies in modern solar installations in Germany and Europe. However, due to&amp;nbsp;their ability to convert sunlight into electricity on both the front and rear sides, the technical requirements for cable routing and installation on the back of the module&amp;nbsp;are also increasing significantly. 
   Make an inquiry now   
 What are bifacial&amp;nbsp;modules? 
 Bifacial modules are photovoltaic modules that convert sunlight into electrical energy on both the front and rear sides. In&amp;nbsp;comparison to classic monofacial modules, they can achieve a higher yield&amp;nbsp;depending on the site conditions.&amp;nbsp; 
 Bifacial modules are increasingly being used in ground-mounted systems and Agri-PV projects, as they offer higher efficiency per square meter due to the backside light yield. However,&amp;nbsp;correct installation is crucial to avoid damage to the module frame or loss of power. 
 Why classic cable fasteners are reaching their limits in modern PV systems&amp;nbsp; 
 With&amp;nbsp;the further development of modern photovoltaic modules - especially bifacial glass-glass modules - the requirements for cable management have also changed significantly. However, many&amp;nbsp;conventional cable fixings were developed for older generations of modules with wide aluminum frames and single-sided energy generation. 
 Modern bifacial modules place new demands on cable routing: 
 
  Narrow frame edges :&amp;nbsp;On the short module side, the usable edge is often &amp;lt;5mm - too little for classic edge clips. 
  Narrow module spacing :&amp;nbsp;In landscape installations, surface-mounted fastenings collide with neighboring rows of modules. 
  Box profiles :&amp;nbsp;Closed hollow chamber profiles offer hardly any points of attack for edge clips.&amp;nbsp; 
 
 Wire clips solve these problems thanks to their flexible spring steel construction.&amp;nbsp; 
   Contact us now   
 Edge clips vs. wire clips 
 In&amp;nbsp;modern photovoltaic installations, the choice of the right cable fastening system is crucial. While classic edge clips were the standard for a long time, wire clips are now becoming increasingly popular for professional PV installations in Germany&amp;nbsp;. 
 
 
 
 
  Feature  
  Edge clips  
  Wire clips (spring steel /&amp;nbsp;S-shape)  
 
 
  Fastening principle  
 Mechanical fixing to the edge of the frame 
 Tension-based fixing via spring force 
 
 
  Suitable for narrow frames (&amp;lt;5&amp;nbsp;mm)  
 Unsuitable 
 Optimal 
 
 
  Suitable for long module side (&amp;gt;15&amp;nbsp;mm)  
 Well suited&amp;nbsp; 
 Suitable 
 
 
  Contact surface on&amp;nbsp;module  
 Large-area edge support required 
 Minimal or low-point contact surfaces 
 
 
  Mechanical&amp;nbsp;load  
 May damage&amp;nbsp;anodized layer 
 No&amp;nbsp;damage to the frame edge 
 
 
  Use for landscape layouts  
 Problematic with narrow module spacing 
 Very&amp;nbsp;well suited for narrow module spacing 
 
 
 
 
 Cable routing for landscape PV systems and narrow module spacing 
 In&amp;nbsp;Germany, PV systems are increasingly being planned with high area efficiency. Landscape installations on commercial roofs or ground-mounted systems in particular require very narrow module spacing. 
 &amp;nbsp; This places high demands on cable management:  
 
 little space between module rows&amp;nbsp; 
 increased requirements for clean string routing&amp;nbsp; 
 Avoidance of shading on the back of the module&amp;nbsp; 
 
 Wire clips enable direct, space-saving cable routing along the back of the module without additional loss of installation space. 
 Error prevention during cabling 
 
 
 
  Fault  Risk  Solution EMC-direct  
 
 
 
 Incorrect polarity of the modules 
 Short circuit, loss of power 
 Marking and check before connection 
 
 
 Cable too thin 
 Voltage loss, overheating 
 Select suitable cross-section 
 
 
 Cable too long 
 Power loss, unclear 
 Calculate optimum cable lengths 
 
 
 Insufficient earthing 
 Electric shock, insurance problems 
 Have a specialist company check the earthing 
 
 
 Improper installation 
 Loss of performance 
 Installation according to the manufacturer&#039;s instructions 
 
 
 
 
 The challenge: frame edges under 5&amp;nbsp;mm&amp;nbsp; 
 At&amp;nbsp;the short module side of modern bifacial modules, the classic mounting edge disappears. With&amp;nbsp;a typical frame height of 30 mm, the usable edge is often less than 5 mm - classic edge clips no longer engage securely and can damage the anodized layer of the frame. 
 &amp;nbsp; This leads to typical installation problems:  
 
 classic cable clips do not have a sufficient contact surface&amp;nbsp; 
 Edge clips lose mechanical hold&amp;nbsp; 
 increased risk of material stress on the module frame&amp;nbsp; 
 restricted cable routing with tight module connections&amp;nbsp; 
 
 This problem is exacerbated in particular&amp;nbsp;in narrow PV layouts with landscape installation. 
   Find out more now   
 S-shaped wire clips as a standard solution for modern PV systems 
 S-shaped wire clips made of spring steel are a&amp;nbsp;particularly proven system in professional photovoltaic installations. 
  These have been specially developed for the requirements of modern bifacial modules with narrow frame profiles&amp;nbsp;:  
 
 flexible S-geometry for tension-free cable retention&amp;nbsp; 
 quick or low-tool installation&amp;nbsp; 
 no mechanical stress on the sensitive module edges 
 
 Conclusion: Precise cable routing is crucial for efficiency and operational safety 
 The&amp;nbsp;professional cable routing of bifacial photovoltaic modules is an important factor for the long-term efficiency and operational reliability of modern PV systems. Even minor planning or installation errors can lead to unfavorable cable routing, mechanical stress or indirect yield losses due to shading&amp;nbsp;. 
 Modern solutions such as wire clips made of spring steel enable material-friendly, space-saving and permanently stable cable routing, even in narrow module arrays and landscape installations. 
 Anyone who consistently implements these requirements and takes them into account as early as the planning phase&amp;nbsp;creates the basis for an efficient, low-maintenance and durable photovoltaic system with high yield stability. 
   Make an inquiry now   
 Frequently asked questions about clamping bifacial&amp;nbsp;modules 
  Can wire clips be retrofitted in existing PV systems&amp;nbsp;?  
 Yes, wire clips can be easily retrofitted in many cases, as long as there is access to the back of the module. Existing cable fastenings can be replaced, especially during maintenance work or string optimization. It is important to redesign the cable routing to avoid tension or unfavorable bending radii.&amp;nbsp; 
  Are there standards or specifications for cable routing in PV systems?  
 Yes, cable routing in photovoltaic systems is subject to various technical requirements. The&amp;nbsp;central standard is&amp;nbsp;DIN VDE 0100-712, which specifies requirements for mechanical protection, cable routing and electrical safety in photovoltaic systems. For PV cables themselves,&amp;nbsp;EN 50618 applies, which defines requirements for weather and UV resistance and minimum bending radii during installation, among other things. In addition, the module manufacturer&#039;s installation instructions must be observed, as they define specific requirements for permissible fixing points and cable routing.&amp;nbsp; 
  How do extreme temperatures affect the cable routing&amp;nbsp;?  
 Extreme temperatures lead to expansion and contraction of cables and module frames. Without&amp;nbsp;flexible fastening, this can lead to mechanical stresses. Wire clips counteract these movements as they work elastically and do not fix cables rigidly. The&amp;nbsp;reduces material stress and prevents long-term damage to cables or plug connections. 
  Can wire clips be used with all module manufacturers&amp;nbsp;?  
 In principle, wire clips can be used universally, but the specific frame geometries and installation instructions of the module manufacturers must be observed. Some&amp;nbsp;manufacturers provide exact specifications for cable routing and permissible fixing points. It is important that the clips do not exert any mechanical stress on critical glass or frame areas and are compatible with the substructure&amp;nbsp;. 
 
 
 Author: Thaddäus Nagy 
 Managing Director of EMC-direct 
 Thaddäus Nagy is Managing Director of EMC-direct and is responsible for the strategic direction and further development of the company in the field of electrical connection technology and cable management. With many years of experience in electrical engineering and a deep understanding of industrial applications, he is intensively involved with the requirements of modern energy and photovoltaic systems. 
 
       
 
 &amp;nbsp; 
  Free white paper on the safe operation of&amp;nbsp;systems  
 In order to raise awareness of the high quality requirements for the assembly and electrical installation of photovoltaic systems at&amp;nbsp;, experts have produced the white paper &quot;Knowing - and avoiding - common causes of damage to photovoltaic systems&quot; on behalf of EMC-direct. 
   Download here free of charge   
 &amp;nbsp; 
  Source &amp;amp; further information: &amp;nbsp; www.photovoltaik.eu  
                ]]>
            </content>

                            <updated>2026-02-24T10:15:00+01:00</updated>
                    </entry>

    
    
        <entry>
            <title type="text">Crimping technology in photovoltaics: Why crimping remains the gold standard</title>
            <id>https://www.emc-direct.de/en/the-company/news-technical-articles/technical-contributions/crimping-technology-in-photovoltaics-why-crimping-remains-the-gold-standard</id>
            <link href="https://www.emc-direct.de/en/the-company/news-technical-articles/technical-contributions/crimping-technology-in-photovoltaics-why-crimping-remains-the-gold-standard"/>
            <summary type="html">
                <![CDATA[
                
                                            Reliable electrical connections are a key requirement for the safe operation of photovoltaic systems. Even the smallest contact faults can lead to increased contact resistance, heat generation or, in extreme cases, arcing in the long term.
                                        ]]>
            </summary>
            <content type="html">
                <![CDATA[
                 
 Content of this article: 
 
  1. What is crimping?  
  2. Crimping technology vs. crimpless technology  
  3. The &quot;black box&quot; problem: risks of crimpless  
  4. It all depends on the right crimping tool  
  5. 5 reasons for the gold standard  
  6. Frequently asked questions  
 
 
 Crimping technology in photovoltaics: Why crimping remains the gold standard 
 Reliable electrical connections are a key prerequisite for the safe operation of photovoltaic systems. Even the smallest contact errors can lead to increased contact resistance, heat generation or, in extreme cases, arcing in the long term. Against this background, crimping technology has established itself as the preferred connection method over decades. 
 While new, tool-free connector systems promise simplified assembly, the professionally executed crimp connection remains the proven standard in professional applications. 
   Make an inquiry now   
 What is crimping? 
 Crimping refers to the precise, plastic deformation of a contact sleeve around an electrical conductor in order to create a permanent, non-detachable connection. In contrast to simple crimping, a defined pressure is applied using a calibrated tool, which results in cold welding. This process forms the technical basis for the success of the MC4 connector in photovoltaics. 
 The cold welding mechanism 
 If the crimping process is carried out correctly, the metal structures flow into each other on a microscopic level. The result is a materially bonded unit with two key properties: 
 
  Oxidation protection : the high compression eliminates air gaps. No oxygen can penetrate - corrosion is permanently prevented. 
  Minimal contact resistance : The metallurgical connection creates a stable contact resistance over decades. 
 
 Crimping technology vs. crimpless technology 
 
 
 
  Criterion  Crimping technology (MC4)  Crimpless technology  
 
 
 
  Contact principle  
 Cold welding 
 Spring or clamping contact 
 
 
  Connection type  
 Material connection 
 Force-fit 
 
 
  Visual inspection  
 Possible 
 Not possible 
 
 
  Long-term stability  
 Very high 
 Dependent on spring force 
 
 
 
 
 The &quot;black box&quot; problem: Why crimped connectors are risky 
 
 The treacherous long-term risk 
 With crimpless systems, the inside remains invisible after assembly.  Stray individual strands  or  inadequate contacting  often go unnoticed during commissioning. Only under full load do these faults develop into hotspots, which can cause expensive damage such as arcing or melting housings years later. 
 
 Material fatigue: When the spring force decreases 
 PV systems are exposed to extreme temperature cycles. While a cold weld remains tight, every mechanical spring is subject to  relaxation : over decades it loses tension, which gradually increases the contact resistance. 
 It all depends on the right crimping tool 
 The quality depends largely on the tool. Professional installations require: 
 
  System-compatible crimping pliers : Precisely matched to the MC4 contact geometry. 
  Cross-section adjustment : Correct adjustment to 4 mm² or 6 mm². 
  Calibrated crimping : This is the only way to guarantee a genuine cold weld. 
 
   Make an inquiry now   
 5 reasons why crimping technology remains the gold standard 
 
  Long-term stability : Lasts the entire service life of the system without maintenance. 
  Verifiable quality : The stranded wire deposit can be checked visually. 
  Oxidation protection : Gas-tight connection prevents corrosion. 
  Mechanical immunity : Resistant to vibrations and wind loads. 
  Fire protection : Minimizes the risk of hotspots and arcing. 
 
 Frequently asked questions 
  Which crimping tools are suitable for MC4 connectors?   Only use tools that are certified for the geometry of MC4 connectors. Universal pliers often lead to poor crimping. 
  How do you check the quality?   Ensure that the strands are evenly inserted and firmly seated. The sleeve must not be torn and the insulation crimp must firmly enclose the cable. 
 
 
 Author: Arnd Diedrichs 
 Hand Tools &amp;amp; Product Management Division, EMC-direct 
 Arnd Diedrichs is responsible for the hand tools division at EMC-direct. With over 30 years of experience, he has driven numerous innovations under the  Toolova  brand. He is an expert in crimping, stripping and cutting tools for photovoltaics and electrical installations. 
 
       
 
 &amp;nbsp; 
 Download free whitepaper 
 Find out more about quality standards in our white paper &quot;Knowing - and avoiding - common causes of damage to photovoltaic systems&quot;. 
   Download the white paper now   
 &amp;nbsp; 
  Source &amp;amp; further information:   www.photovoltaik.eu  
                ]]>
            </content>

                            <updated>2026-02-18T09:15:00+01:00</updated>
                    </entry>

    
    
        <entry>
            <title type="text">Cable protection in solar parks: the right choice of UV-resistant conduits</title>
            <id>https://www.emc-direct.de/en/the-company/news-technical-articles/technical-contributions/cable-protection-in-solar-parks-the-right-choice-of-uv-resistant-conduits</id>
            <link href="https://www.emc-direct.de/en/the-company/news-technical-articles/technical-contributions/cable-protection-in-solar-parks-the-right-choice-of-uv-resistant-conduits"/>
            <summary type="html">
                <![CDATA[
                
                                            Protective pipes in PV systems are often underestimated - yet they have a significant influence on service life and operational safety. Black is not a UV certificate: only long-term UV-stabilized pipes made of PP-UV, HDPE-UV or PVC-U with a documented test certificate are suit...
                                        ]]>
            </summary>
            <content type="html">
                <![CDATA[
                 
 Content of this article: 
 
  1. Why cable protection in PV systems is often underestimated  
  2. UV resistance: materials, additives, proofs  
  3. Separate areas of application: Roof/exterior, ground, concrete  
  4. Pressure requirements in the ground (tips)  
  5. Animal browsing in PV parks: Measures with a sense of proportion  
  6. Procurement &amp;amp; verification (DE/EU)  
  7. Selection tips &amp;amp; product examples  
  8. Conclusion: System quality through suitable pipe selection  
 
 
 Why cable protection in PV systems is often underestimated 
 Photovoltaic systems do not only consist of modules, cables and inverters. Clamps, clips and, in particular, conduits also influence service life and operational safety. Unsuitable standard empty conduits on roofs quickly become brittle due to UV radiation - with risks for cable sheaths, seals and yield. 
 UV resistance: materials, additives, verification 
 Black coloration is not proof of UV resistance. UV radiation gradually degrades polymers; without stabilization, plastics lose toughness and can crack. Long-term UV-stabilized types are mandatory for outdoor and roof mounting. Proven in the PV environment:  PP-UV ,  HDPE-UV  and - in UV-stabilized versions -  PVC-U  with coordinated additive packages. Tested compounds and reliable evidence (e.g.&amp;nbsp;e.g. tests in accordance with ISO&amp;nbsp;4892-2) are essential. Standard PVC installation pipes without UV certification (e.g.&amp;nbsp;e.g. FBY, FFKuS) are not suitable for outdoor and roof applications. 
 Separate areas of application: Roof/exterior, soil, concrete 
 
  Roof &amp;amp; exterior sections:  Only use long-term UV-stabilized pipes (PP-UV, HDPE-UV or PVC-U in UV-resistant design with verification). Avoid standard installation/concealed/concealed empty pipes (incl. standard corrugated PVC installation pipes such as FBY/FFKuS and&amp;nbsp;a.) outdoors. 
  Soil:  Design the compressive strength for the load case. High compressive strengths are often required for large solar parks (guide value: &amp;gt;&amp;nbsp;750&amp;nbsp;  N). Refer to the manufacturer&#039;s data sheets for specific classes. 
  Concrete/over-concreting:  Only use pipes that are expressly designated as suitable for concrete. Lightweight soil pipes are typically not approved for this purpose. 
  Fire protection/halogen-free:  Provide halogen-free, flame-retardant types in safety-relevant areas; consider conflicting objectives (impact resistance/costs). 
 
 Pressure requirements in the ground (notes) 
 The required compressive strength depends on the type of installation, compaction, traffic and point loads. Standard and class assignment as well as permissible installation types must be checked  in the data sheet depending on the manufacturer . 
 Animal browsing in PV parks: measures with a sense of proportion 
 &quot;Marten-proof&quot; means risk reduction, not absolute protection. Chemically neutral, low-taste plastics (e.g.&amp;nbsp;e.g. PA, PP) and smooth, hard surfaces, to which marking odors adhere less well, are tried and tested. Special additives/formulations can provide support in outdoor areas. In hotspots, metal-coated or hybrid-reinforced systems increase resistance. 
 Procurement &amp;amp; verification (DE/EU) 
 
 Do not install standard installation/flush-mounted pipes on roofs. 
 Request UV test reports (e.g.&amp;nbsp;e.g. ISO&amp;nbsp;4892-2), pressure resistance, temperature range and fire information if necessary. 
 IP protection depends on the connection system (sleeves/couplings, sealing compounds) -  check data sheet . 
 Relevant installation standards and project specifications apply for underground installation; specific standard assignment is made  via the product data sheet . 
 
 Selection information &amp;amp; product examples 
 
  HDPE-UV  (unslotted, with tension wire) - for buried PV/RES applications; concrete cover only with express approval. Link:  HDPE corrugated pipe (UV, 10&amp;nbsp;years)  
  PP-UV corrugated pipe  (long-term UV-resistant) - for outdoor/roof routes; verify pressure/temperature/bending radius and fastening systems on a project-specific basis. Link:  PP corrugated pipe (UV)  
  Compound solutions  - combine UV stabilization, compressive strength and, if necessary, fire protection; selection strictly according to project specification and data sheet. 
 
  Make an inquiry now  
 Conclusion: System quality through suitable pipe selection 
 UV-resistant protective conduits are central to PV cable protection. Those who clearly separate areas of application (roof/outside vs. underground), select PP-UV, HDPE-UV or PVC-U in UV-stabilized design, take into account high pressure requirements in the ground (guideline value: &amp;gt;&amp;nbsp;750&amp;nbsp;  N) and demand reliable proof (UV tests, IP protection according to data sheet), reduce failures and rework and increase system availability. 
 
 
 
 Thaddäus Nagy 
 Managing Director EMC-direct 
 Thaddäus Nagy is responsible for cable protection for PV and wind energy projects at EMC-direct. He supports ground-mounted systems in the MW range throughout Europe and has many years of experience in the plastics industry (including&amp;nbsp;, BASF, Covestro, LANXESS) and in strategy consulting (BCG). 
 &quot;Z-parts such as protective tubes also significantly determine the service life of a PV installation. Black is not UV proof - the tested material formulation is decisive.&quot; 
 Further information about Thaddäus Nagy &amp;nbsp; 
       
 
 Frequently asked questions 
  Is the black color sufficient as UV proof?   No. UV resistance results from additives and tested compounds - not from the color. Black alone is not proof. Test reports are decisive, e.g.&amp;nbsp;e.g. in accordance with ISO&amp;nbsp;4892-2. 
  Which materials are suitable for roofs and outdoor sections?   PP-UV, HDPE-UV and PVC-U in UV-stabilized design with documented test certificate. Standard empty pipes without UV certification (e.g.&amp;nbsp;e.g. FBY, FFKuS) are not suitable for outdoor and roof applications. 
  What compressive strength do I need for underground installation in solar parks?   The pressure class according to EN&amp;nbsp;61386-24 is decisive for underground installation in ground-mounted solar parks. With standard-compliant bedding (sand/gravel, without driving over), 450&amp;nbsp;N is the established standard class - as designed and classified by independent manufacturers for ground-mounted PV systems. In the case of increased mechanical stress - for example due to compaction equipment, construction site traffic or shallow cover depths - 750&amp;nbsp;N or more is required. The binding specification is made depending on the load case via the product data sheet and the project specification. 
  What is the difference between 450&amp;nbsp;N and higher pressure classes?   450&amp;nbsp;N covers the typical ground installation case in ground-mounted PV systems with standard-compliant bedding. 750&amp;nbsp;N is used for increased loads - e.g.&amp;nbsp;e.g. heavy traffic, intensive compaction, narrow cover or special soil conditions. Explicit manufacturer approval is always required for concrete coverings. The basis is EN&amp;nbsp;61386-24. 
  How do I take fire protection into account?   Provide halogen-free, flame-retardant types in safety-relevant areas. Observe conflicting objectives: Such pipes are flame-retardant, but can be less impact-resistant and more expensive. Implement the requirements from the project specification. 
  What needs to be considered for connectors and IP protection?   The IP protection of the overall system depends on the connector system used (sleeves, couplings, sealing compounds). Example: HDPE-UV 450&amp;nbsp;N achieves IP40 in its basic state; with sealing ring (up to 110&amp;nbsp;mm) IP67, with special sealing compound IP68. Please refer to the relevant product data sheet for details. 
  Is PVC-U approved for roof applications?   Yes - but only in UV-stabilized versions with documented test certificates. Standard PVC installation pipes without UV certification (e.g.&amp;nbsp;B. FBY, FFKuS) are not suitable for outdoor and roof applications and must not be used there. 
  Which certificates should I request when purchasing?   UV test report (e.g.&amp;nbsp;e.g. ISO&amp;nbsp;4892-2), pressure class in accordance with EN&amp;nbsp;61386-24, permissible temperature range, IP protection class of the connector system and fire protection classification if applicable. For underground installation additionally: installation approval of the manufacturer for the respective load case. 
  Source &amp;amp; further information:  This article is based on the technical article by Thaddäus Nagy, published on 29.10.2025 on photovoltaik.eu:  &quot;EMC-direct: Thermowells often underestimated&quot;  
                ]]>
            </content>

                            <updated>2025-10-29T09:30:00+01:00</updated>
                    </entry>

    
    
        <entry>
            <title type="text">DC plug cross-mounting on PV systems: an underestimated safety risk</title>
            <id>https://www.emc-direct.de/en/the-company/news-technical-articles/technical-contributions/dc-plug-cross-mounting-on-pv-systems-an-underestimated-safety-risk</id>
            <link href="https://www.emc-direct.de/en/the-company/news-technical-articles/technical-contributions/dc-plug-cross-mounting-on-pv-systems-an-underestimated-safety-risk"/>
            <summary type="html">
                <![CDATA[
                
                                            DC connectors that can be mechanically joined together are by no means safe to combine. Cross-installation - i.e. mixing connectors from different manufacturers - is one of the most common and most dangerous installation errors in photovoltaic systems. What appears to be a pra...
                                        ]]>
            </summary>
            <content type="html">
                <![CDATA[
                 
 Content of this article: 
 
  1. DC plug cross-mounting on PV systems  
  2. Why standards do not guarantee compatibility  
  3. MC4 connectors and pre-assembly  
  4. Fire hazard due to thermal overload  
  5. Loss of warranty and insurance risk  
  6. Personal liability of the installer  
  7. Practical advice from EMC-direct  
  8. Frequently asked questions (FAQ)  
  9. Note from the provider  
  10. Source &amp;amp; further information  
 
 
 DC plug cross-connection on PV systems: An underestimated safety risk 
 Article on the topic &quot;EMC-direct: Cross installation is very risky&quot; - first published on 24.09.2025 as a guest article by Thaddäus Nagy on  www.photovoltaik.eu.  
 Anyone who installs photovoltaic systems will be familiar with the situation: the connectors from two different manufacturers can be mechanically joined together - and at first glance, everything seems to fit. However, this apparent compatibility is deceptive. Cross-installation, i.e. the combination of DC connectors from different manufacturers, is one of the most common installation errors in photovoltaics.  Thaddäus Nagy , Managing Director of EMC-direct, explains the technical and legal consequences of this error. 
 Why standards alone do not guarantee compatibility 
 A common misunderstanding in practice: Because  IEC 62852  is an international standard for DC connectors in PV systems, many installers assume that standard-compliant connectors can always be combined with each other.  This is wrong.  The standard defines minimum requirements for individual connectors - but not interoperability between products from different manufacturers. 
 In practice, this means that two connectors, each of which complies with the standard on its own, can cause considerable safety problems when combined. Differences in material composition, manufacturing tolerances and contact geometry mean that the contact surface is too small or mechanical stresses occur in the connector. The consequences are increased contact resistance, reduced electrical conductivity and an increased risk of heat generation and arcing. 
 MC4 connectors and the problem of pre-assembly 
 This issue is particularly relevant for solar modules that are supplied with pre-assembled connection cables. Many of these modules - especially those manufactured in Asia or China - are equipped with connectors that are described as &quot;MC4-compatible&quot;, but are neither officially certified nor have tested compatibility with connectors from other brands. 
 This creates a dilemma for the installer: If the pre-assembled connector of the module is replaced by another or combined with a mating connector of a different brand, this technically constitutes a cross-installation - regardless of whether the connection can be closed mechanically. Adapter solutions often also lead to insufficient contact surface or mechanical stresses. 
 Fire hazard due to thermal overload 
 The electrical contact resistance at an improperly manufactured plug connection is not just an efficiency problem - it is a serious safety risk. High direct currents flow in PV systems for many hours every day. Even a slightly increased resistance at a plug-in point can lead to continuous heat generation, which thermally damages the connector and spreads to adjacent components. 
 There is also a second, insidious problem: connectors that are not designed to work together do not usually offer sufficient protection against moisture and dirt. Water - whether from rain, dew or condensation - penetrates the connection and triggers corrosion processes on the contact surfaces. These are barely visible from the outside, but increasingly impair conductivity. The consequence follows a dangerous chain of escalation: poor contact, heat development, arcing, fire. 
 Loss of warranty and insurance risk 
 The technical risks of cross-installation are serious - the legal and economic consequences are no less so. Almost all module manufacturers link their guarantee conditions to standard-compliant installation, which expressly includes the use of approved and tested plug connections. Unauthorized cross-installation can therefore be considered improper use and will result in the complete loss of the module&#039;s warranty. 
 In the event of a claim, many solar insurers check whether the technical connection conditions have been complied with. If cross-installation is proven, there is a risk of loss of insurance cover - even if the damage is not directly attributable to the plug connection. 
 Personal liability of the installer according to BGB 
 The civil law dimension of cross-connection is particularly important for specialist companies and independent installers. According to  § 634 BGB , the contractor is liable to the customer for defects in the building. If an installation error such as cross-installation is subsequently identified as the cause of damage, the installer is liable - potentially for many years after the system has been commissioned. 
 What appears to be a pragmatic solution at the time of installation can therefore lead to considerable financial burdens in the long term. 
 Practical advice from EMC-direct 
 EMC-direct&#039;s advice is clear: use original connectors, use adapters certified by the manufacturer or rely on individually configured and tested connector systems from the outset. 
 FAQ 
  What is cross-mounting for DC connectors?   Cross-installation refers to the combination of connectors from different manufacturers or designs in a PV system. Even if these can be joined together mechanically, they are generally not compatible with the standards and can cause considerable safety risks. 
  Why are &quot;MC4-compatible&quot; connectors not automatically safe to combine?   The term &quot;MC4-compatible&quot; merely describes an external similarity with the MC4 connector system. It does not imply official certification or tested compatibility with connectors of other brands. Tolerances, materials and contact geometry can differ considerably despite similar external shapes. 
  Which standard regulates DC connectors in PV systems?    IEC 62852  specifies requirements for connectors for PV systems. However, it does not guarantee cross-manufacturer compatibility. For standard-compliant and safe installation, only connectors that have been approved by the module manufacturer or tested together as a compatible system should be used. 
  What are the legal consequences of cross-installation for the installer?   According to  § 634 BGB , the installer is liable for defects in the work. If cross-installation is identified as the cause of damage, the liability can continue to apply for years after commissioning. In addition, there is a risk of loss of warranty with the module manufacturer and possible loss of insurance cover. 
  How can cross-installation be reliably avoided in practice?   The safest method is the consistent use of original connectors from the module manufacturer or mating connectors expressly certified by the manufacturer. Alternatively, individually configured, tested connector systems can be used. Before installation, the approval documentation for the connectors used should be checked and documented. 
 
 
 Author: Thaddäus Nagy 
 Managing Director of EMC-direct 
 Thaddäus Nagy is Managing Director of EMC-direct and is responsible for the strategic direction and international project support in the field of cable management and cable protection for photovoltaics. Together with his team, he has overseen the construction of several dozen ground-mounted systems in Europe in recent years. He supports international customers in the specification and selection of suitable components - including projects with outputs of over 100&amp;nbsp;MW. His work is based on many years of experience in plastics and plastics processing as well as an established partner, supplier and quality network in Asia. 
 He regularly publishes practice-oriented technical articles on cable protection and cable management in the PV environment. 
 
       
 
 Note from the supplier 
 Specialist companies can find suitable solar connectors for standard-compliant PV installations in the EMC-direct range:  Solar connectors . Further information on common causes of damage to photovoltaic systems can be found in the free EMC-direct white paper for download. 
   Make an inquiry now   
 Free white paper on the safe operation of photovoltaic systems 
 EMC-direct experts have produced the white paper &quot;Knowing and avoiding common causes of damage to photovoltaic systems&quot; to raise awareness of the highest quality standards. 
   Download now free of charge   
 Source &amp;amp; further information 
 First published: 24.09.2025, guest article by Thaddäus Nagy on  www.photovoltaik.eu  
  www.photovoltaik.eu  Ph  oto:&amp;nbsp;  ©  EMC-direct/Ulrich Wolf    
                ]]>
            </content>

                            <updated>2025-09-24T15:30:00+02:00</updated>
                    </entry>

    
    
        <entry>
            <title type="text">Why installation errors in photovoltaic systems cause long-term damage</title>
            <id>https://www.emc-direct.de/en/the-company/news-technical-articles/technical-contributions/why-installation-errors-in-photovoltaic-systems-cause-long-term-damage</id>
            <link href="https://www.emc-direct.de/en/the-company/news-technical-articles/technical-contributions/why-installation-errors-in-photovoltaic-systems-cause-long-term-damage"/>
            <summary type="html">
                <![CDATA[
                
                                            Installation errors in photovoltaic systems are among the most common causes of damage and yield losses. The technical article explains typical sources of error and shows practical solutions.
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            </summary>
            <content type="html">
                <![CDATA[
                 In practice, installation errors are one of the most common reasons for damage and power losses in photovoltaic systems. They are often caused by ignorance, time pressure or the use of unsuitable materials. It is therefore crucial for installers and planners to recognize typical weak points at an early stage and to consistently eliminate them - because many problems do not show up immediately, but develop gradually over months or years. 
 The article bundles the most important risk areas and classifies them in such a way that they can be used directly in everyday project work. 
 The topic was also addressed in a specialist article by EMC-direct on   photovoltaik.eu &amp;nbsp;. 
 Why installation errors can be so expensive in the long term 
 Unlike obvious defects, the pitfall of many installation errors is that they initially remain inconspicuous. Mechanical stresses in modules, inadequate protection against the weather or weaknesses in the electrical installation can permanently reduce efficiency. If UV radiation, temperature changes and humidity are added to this, the ageing of individual components accelerates - with consequences that can even lead to the failure of entire strings. 
 Mechanics and roof design: when the basis is not right 
 Incorrect module installation is a particularly common problem. If solar modules are not installed in accordance with the specifications, mechanical stresses can occur that put strain on the structure of the module. The consequences range from subtle cell damage to visible damage - and therefore measurable yield losses. 
 
 &quot;This can lead to mechanical stresses in the modules, which in the worst case can cause cracks in the solar cells or the glass.&quot; 
 Source: EMC-direct, published on photovoltaik.eu  
 It becomes critical when such damage is coupled with moisture ingress: this increases the susceptibility to further degradation. There are additional risks on the roof. Temporary roof penetrations or cable routing that is permanently exposed to UV radiation can cause cables to become brittle. If the insulation is chafed as a result, the path to short circuits and consequential damage to components is not far away. 
 Practical focus: cable routing on the roof 
 Every detail counts in the design. A roof feed-through &quot;via the raised roof tile&quot; appears to be a quick solution in the short term, but often leads to leaks and mechanical stress on the cables in the long term. As a result, repair costs and the risk of unplanned downtime increase - both factors that operators pay for particularly dearly. 
 Electrical installation and earthing: safety starts with the details 
 In addition to the mechanical installation, the quality of the electrical installation is decisive for safety and reliability. Proper earthing is a key element in protecting the system from overvoltages and preventing faults. 
 
 &quot;Proper earthing is therefore essential to avoid overvoltages and electromagnetic interference.&quot; 
 Source: EMC-direct, published on photovoltaik.eu  
 Earthing errors can not only damage electronic components, but also increase the risk of electrical accidents. For specialist companies in Germany, this means that the protection concept, choice of materials and design must fit together - and be consistently checked during acceptance. 
 Cable management under the influence of the weather: the underestimated permanent stress 
 Photovoltaic systems are constantly exposed to demanding weather conditions. If adequate protection against moisture, dirt and UV radiation is not taken into account during installation and material selection, there is a risk of corrosion, insulation faults and premature material fatigue. 
 
 &quot;UV radiation, temperature fluctuations and moisture can cause cable management components to age and become brittle.&quot; 
 Source: EMC-direct, published on photovoltaik.eu  
 Poorly routed cables also increase the risk of insulation damage - for example due to moisture, corrosion or chafing. In practice, this often results in inverter failures because the devices are dependent on a constant and uninterrupted voltage supply. Such failures are costly and tie up time, which is usually in short supply on construction sites. 
 Ground-mounted systems: additional risks from animals, snow and operation 
 In ground-mounted systems, special stresses are added. Loose cables or cables hanging under modules can become a hazard if animals get caught in them. At the same time, additional weight from snow or ice increases the mechanical load. Consistent cable management reduces these risks, relieves the strain on junction boxes and plug connections and minimizes damage - even during maintenance work such as mowing. 
 Conclusion: less improvisation, more standard 
 Installation errors are rarely &quot;a single slip-up&quot;. It is often a chain of small imperfections that lead to performance losses, failures and increased maintenance costs under real environmental conditions. If planning, materials and execution are properly dovetailed, risks are noticeably reduced - and yield and safety are protected over the entire service life of the system. 
 The   free white paper on the safe operation of photovoltaic systems  provides in-depth information on common causes of damage and preventive measures. 
  Author:    Thaddäus Nagy , Managing Director EMC-direct 
  Source &amp;amp; further information:    www.photovoltaik.eu   
                ]]>
            </content>

                            <updated>2025-02-09T10:15:00+01:00</updated>
                    </entry>

    
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