{"id":98265,"date":"2023-03-01T08:00:52","date_gmt":"2023-03-01T13:00:52","guid":{"rendered":"https:\/\/www.solarpowerworldonline.com\/?p=98265"},"modified":"2023-02-23T15:46:33","modified_gmt":"2023-02-23T20:46:33","slug":"build-a-smart-foundation-for-wire-management-using-rail-or-rail-less-solar-pv-on-your-metal-roof","status":"publish","type":"post","link":"https:\/\/www.solarpowerworldonline.com\/2023\/03\/build-a-smart-foundation-for-wire-management-using-rail-or-rail-less-solar-pv-on-your-metal-roof\/","title":{"rendered":"Build a Smart Foundation for Wire Management Using Rail or Rail-less Solar PV on Your Metal Roof"},"content":{"rendered":"<p><img decoding=\"async\" loading=\"lazy\" src=\"\/wp-content\/uploads\/2022\/04\/s5-sponsored-featured-april2022.jpg\" alt=\"\" width=\"770\" height=\"385\" class=\"aligncenter size-full wp-image-98271\" srcset=\"https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-featured-april2022.jpg 770w, https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-featured-april2022-500x250.jpg 500w, https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-featured-april2022-368x184.jpg 368w\" sizes=\"(max-width: 770px) 100vw, 770px\" \/><\/p>\n<p><em>By S-5!<\/em><\/p>\n<p>Are you new to installing solar PV modules on a metal roof? We\u2019ve heard from many of you who\u2019d like a better grasp on the fundamentals of solar PV installation \u2013 especially when setting the stage for proper wire management. So today, the solar experts at S-5! are offering you a primer on:<\/p>\n<ul>\n<li>The\u00a0<strong>components of a PV array<\/strong>\u00a0and how they work together.<\/li>\n<li>An overview of\u00a0<strong>Module-Level Power Electronics<\/strong>\u00a0(MLPE).<\/li>\n<li>The steps to get ready for solar\u00a0<strong>PV wire-management<\/strong>\u00a0design.<\/li>\n<\/ul>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"\/wp-content\/uploads\/2022\/04\/s5-sponsored-image1-april2022.png\" alt=\"\" width=\"462\" height=\"346\" class=\"aligncenter size-full wp-image-98272\" srcset=\"https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-image1-april2022.png 462w, https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-image1-april2022-318x238.png 318w\" sizes=\"(max-width: 462px) 100vw, 462px\" \/><\/p>\n<h4>How Do the Components of Your PV Array Interact?<\/h4>\n<p>Let\u2019s take a quick look at some basic features of your solar array:<\/p>\n<ul>\n<li>A solar\u00a0<strong>cell<\/strong>\u00a0(PV cell) is made of semiconductor material. The cell absorbs and converts sunlight into direct current (DC) electricity.<\/li>\n<li>A solar<strong>\u00a0module<\/strong>\u00a0is a collection of cells wired together and housed in a sealed frame with a glass surface.<\/li>\n<li>Each module has two\u00a0<strong>conductor<\/strong>\u00a0wires: one positively charged [+] wire and one negatively charged [-] wire. Conductors are mounted on the underside of each module.<\/li>\n<li>A\u00a0<strong>string\u00a0<\/strong>is a set of modules electrically connected by conductor wires. There are typically 16 to 18 modules in a string but the number of modules will vary depending on their output and your inverter\u2019s input capacity.<\/li>\n<li>A solar\u00a0<strong>array<\/strong>\u00a0is the collection of module strings working together to generate a single electrical output.<\/li>\n<li><strong>Balance of System (BOS)<\/strong>\u00a0components are the items your system needs to work effectively other than the modules. Elements of BOS include:\n<ul>\n<li>An\u00a0<strong>inverter<\/strong>\u00a0to convert the DC electricity into alternating current (AC) electricity. The inverter may be located on the roof at the edge of the PV system, another place outside the building or even inside the building.<\/li>\n<li>A\u00a0<strong>homerun<\/strong>\u00a0to route the generated electricity from the modules to the inverter for DC-to-AC conversion. The homerun houses bundles of wires and may consist of conduit or wire management trays.<\/li>\n<li><strong>Combiner\/junction boxes<\/strong>\u00a0house wiring junctions and other electrical connection devices.<\/li>\n<li><strong>Mounting hardware<\/strong>\/structures.<\/li>\n<li><strong>Batteries<\/strong>\u00a0and other supplemental parts.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"\/wp-content\/uploads\/2022\/04\/s5-sponsored-featured-april2022.jpg\" alt=\"\" width=\"770\" height=\"385\" class=\"aligncenter size-full wp-image-98271\" srcset=\"https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-featured-april2022.jpg 770w, https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-featured-april2022-500x250.jpg 500w, https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-featured-april2022-368x184.jpg 368w\" sizes=\"(max-width: 770px) 100vw, 770px\" \/><\/p>\n<h4>How Do You Get the Energy From Your Modules to the Building?<\/h4>\n<p>Conductors under the modules need to be plugged together in series where the \u201c+\u201d conductor of one module connects to the \u201c\u2013\u201d conductor of the next module in the string. This results in a \u201c+\u201d conductor on one end of the string and a \u201c\u2013\u201d conductor on the other end. Jumper wires are attached to the string ends to route the electricity beneath the array, through the homerun and to the inverter.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"\/wp-content\/uploads\/2022\/04\/s5-sponsored-image3-april2022.png\" alt=\"\" width=\"606\" height=\"340\" class=\"aligncenter size-full wp-image-98273\" srcset=\"https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-image3-april2022.png 606w, https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-image3-april2022-500x281.png 500w, https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-image3-april2022-368x206.png 368w\" sizes=\"(max-width: 606px) 100vw, 606px\" \/><\/p>\n<p>As with any electrical component, grounding is important. The building code requires any metallic item in your solar PV system not carrying power\/electricity (like the metal module frames) to be grounded. The ground path has to go to the system ground of your building for protection in case a wire carrying electricity breaks over time and electrifies some other metallic component. These other metallic items must be electrically bonded to one another using an approved method to maintain a continuous ground path. Some rail-less mounting solutions function as UL-listed bonding devices and make the bonded connection automatic.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"\/wp-content\/uploads\/2022\/04\/s5-sponsored-image4-april2022.png\" alt=\"\" width=\"832\" height=\"238\" class=\"aligncenter size-full wp-image-98274\" srcset=\"https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-image4-april2022.png 832w, https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-image4-april2022-500x143.png 500w, https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-image4-april2022-368x105.png 368w\" sizes=\"(max-width: 832px) 100vw, 832px\" \/><\/p>\n<p>Once all components are bonded together, a ground-path chain is established and only one of the components in the chain needs a wire to connect the system to the ground (as each bonded metal component is then also grounded).<\/p>\n<p>Wires cannot lay on the roof as they\u2019ll carry electricity and the metal roof is, well, metallic. And keeping wires off the roof protects them from water and debris. Conductor wires are often longer than needed if you\u2019re simply connecting to an adjacent module, so they should be coiled, tucked up under the module and secured in place. The best practice is to attach wires to the underside of the module frames using wire clips. Wire clips come in many different forms and are an easy way to prevent wires from touching the roof.\u00a0<a href=\"https:\/\/s-5.com\/products\/tools-hardware\/#PVclips\" target=\"_blank\" rel=\"noopener\"><strong><u>Explore our new wire clips!<\/u><\/strong><\/a><\/p>\n<h4>What Are Module-Level Power Electronics and How Do They Work?<\/h4>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"\/wp-content\/uploads\/2022\/04\/s5-sponsored-image5-april2022.png\" alt=\"\" width=\"339\" height=\"254\" class=\"alignleft size-full wp-image-98276\" srcset=\"https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-image5-april2022.png 339w, https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-image5-april2022-318x238.png 318w\" sizes=\"(max-width: 339px) 100vw, 339px\" \/><br \/>\nModule-level power electronics (MLPE) refer to devices electrically connected to each module such as microinverters, optimizers and rapid-shutdown devices.\u00a0<em>(See image to the left: An example of an MLPE mounted on the S-5! CorruBracket&#x2122; 500T PV.)<\/em><\/p>\n<p><strong>Let\u2019s take a quick look at these three components:<\/strong><\/p>\n<ul>\n<li><strong>Microinverters<\/strong>\u00a0convert power from DC to AC at each module. They can be mounted to the underside of each module using clips or attached to the roof. The benefit of microinverters is an increase in efficiency. The disadvantage of these devices is you\u2019ll have more individual pieces of electronic equipment to maintain.<\/li>\n<\/ul>\n<ul>\n<li><strong>Optimizers\u00a0<\/strong>help each module increase efficiency but do not convert power at the module level. They are less expensive than microinverters, but (as with microinverters) there are more pieces to maintain. The best place to affix an optimizer is beneath the module on the frame.\u00a0<em>(Image below shows the installation of an optimizer on a solar panel.)<\/em><\/li>\n<\/ul>\n<ul>\n<li><strong>Rapid-shutdown devices<\/strong>\u00a0are safety solutions. They de-energize solar system DC conductors and give firefighters safe access to the roof during a fire. Rapid-shutdown devices should be attached to the module frame.<\/li>\n<\/ul>\n<h4>How Do You Prepare for Successful Wire Management?<\/h4>\n<p>Here are few best practices to consider before starting your wire-management design:<\/p>\n<div style=\"border-style: solid; border-width: thin; padding: 15px 15px 0px 15px;\">\n<table>\n<tr>\n<td width=\"200\"><img decoding=\"async\" loading=\"lazy\" src=\"\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage1-april2022.jpg\" alt=\"\" width=\"150\" height=\"188\" class=\"aligncenter size-full wp-image-98277\" srcset=\"https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage1-april2022.jpg 265w, https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage1-april2022-189x238.jpg 189w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/td>\n<td>\n<ul>\n<li>Pre-planning your installation is key to any good metal rooftop solar PV electric design.<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<td><img decoding=\"async\" loading=\"lazy\" src=\"\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage2-april2022.jpg\" alt=\"\" width=\"341\" height=\"250\" class=\"aligncenter size-full wp-image-98278\" srcset=\"https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage2-april2022.jpg 341w, https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage2-april2022-325x238.jpg 325w\" sizes=\"(max-width: 341px) 100vw, 341px\" \/><\/td>\n<td>\n<ul>\n<li>We understand there\u2019s a preference to get as many modules on the roof as possible, but it\u2019s a good practice to have periodic walk space. Leaving walk space will help accomplish a quicker installation and give you better access for operations and maintenance in the future.<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<td><img decoding=\"async\" loading=\"lazy\" src=\"\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage3-april2022.jpg\" alt=\"\" width=\"200\" height=\"176\" class=\"aligncenter size-full wp-image-98279\" srcset=\"https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage3-april2022.jpg 501w, https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage3-april2022-270x238.jpg 270w\" sizes=\"(max-width: 200px) 100vw, 200px\" \/><\/td>\n<td>\n<ul>\n<li>Each module brand has designated attachment zones based on their testing and the maximum loads they allow. It\u2019s important to know the design wind loads at your specific building site so you can determine the proper module attachment zones and the frequency of attachments. (<em>Image below references specific module clamping zones in high-wind areas.<\/em>)<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/table>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage4-april2022.jpg\" alt=\"\" width=\"545\" height=\"391\" class=\"aligncenter size-full wp-image-98280\" srcset=\"https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage4-april2022.jpg 545w, https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage4-april2022-500x359.jpg 500w, https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage4-april2022-332x238.jpg 332w\" sizes=\"(max-width: 545px) 100vw, 545px\" \/><\/p>\n<table>\n<tr>\n<td width=\"200\"><img decoding=\"async\" loading=\"lazy\" src=\"\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage5-april2022.jpg\" alt=\"\" width=\"200\" height=\"200\" class=\"aligncenter size-full wp-image-98281\" srcset=\"https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage5-april2022.jpg 341w, https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage5-april2022-150x150.jpg 150w, https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage5-april2022-238x238.jpg 238w\" sizes=\"(max-width: 200px) 100vw, 200px\" \/><\/td>\n<td>\n<ul>\n<li>The prep work of coiling and clipping the wires to each module is much easier to do while standing on the ground. Plus, taking care of the extra wiring in advance will minimize your time on the roof and make installation much smoother. When you clip up module wires, position the conductor ends at the exact locations needed. Then you can easily connect the modules together on the roof without the need to reach for the conductor ends.<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<td><img decoding=\"async\" loading=\"lazy\" src=\"\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage6-april2022.png\" alt=\"\" width=\"250\" height=\"264\" class=\"aligncenter size-full wp-image-98282\" srcset=\"https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage6-april2022.png 250w, https:\/\/www.solarpowerworldonline.com\/wp-content\/uploads\/2022\/04\/s5-sponsored-tableimage6-april2022-225x238.png 225w\" sizes=\"(max-width: 250px) 100vw, 250px\" \/><\/td>\n<td>\n<ul>\n<li>If you\u2019re using a rail-less solar PV mounting system, the standing seam metal roof seams or exposed-fastened roof trapezoidal or corrugated ribs become the rails. The modules are best laid out in landscape orientation. Rail-less systems can be installed on-the-fly with the right mounting solution. Our <a href=\"https:\/\/s-5.com\/solar-calculator\/?step=solar_calculator&#038;screen=add_project\" rel=\"noopener\" target=\"_blank\"><strong><u>Solar Calculator<\/u><\/strong><\/a> can help you with the layout when you\u2019re using the PVKIT rail-less system.<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/table>\n<\/div>\n<p>&nbsp;<\/p>\n<h4>Ideas to Hold Onto<\/h4>\n<p>Now you have a solid understanding of your PV system\u2019s basic infrastructure. We laid the groundwork by defining commonly used terms and examined:<\/p>\n<ul>\n<li>The way many components connect to form a PV array.<\/li>\n<li>The items involved in Module-Level Power Electronics (MLPE).<\/li>\n<li>The advance preparations that pave the way for successful rail-less solar wire management on a metal rooftop.<\/li>\n<\/ul>\n<h5><strong><em>Ready to take your knowledge to the next level?<\/em><\/strong><\/h5>\n<p>String design in wire management is critically important, and there\u2019s a lot to consider. In an upcoming blog, we\u2019ll cover the two main approaches for rail-less wire management \u2013 the direct method and the trunk method \u2013 and give you key strategies for planning your PV array\u2019s electric design. Check back soon!<\/p>\n<p><em>Sponsored Content by S-5!<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>By S-5! Are you new to installing solar PV modules on a metal roof? We\u2019ve heard from many of you who\u2019d like a better grasp on the fundamentals of solar PV installation \u2013 especially when setting the stage for proper wire management. So today, the solar experts at S-5! are offering you a primer on:&hellip;<\/p>\n","protected":false},"author":18300,"featured_media":98271,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":""},"categories":[4352],"tags":[5320],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Build a Smart Foundation for Wire Management Using Rail or Rail-less Solar PV on Your Metal Roof<\/title>\n<meta name=\"description\" content=\"By S-5! Are you new to installing solar PV modules on a metal roof? 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