{"id":686,"date":"2026-04-29T05:42:37","date_gmt":"2026-04-29T05:42:37","guid":{"rendered":"https:\/\/skssynergies.com\/blog\/?p=686"},"modified":"2026-04-29T05:42:37","modified_gmt":"2026-04-29T05:42:37","slug":"what-is-solar-panel-temperature-coefficient","status":"publish","type":"post","link":"https:\/\/skssynergies.com\/blog\/what-is-solar-panel-temperature-coefficient\/","title":{"rendered":"What is solar panel temperature coefficient"},"content":{"rendered":"<p data-start=\"91\" data-end=\"311\">When choosing solar panels for a hot city like Chennai, most people focus on wattage and efficiency. But there\u2019s another factor that has a <strong data-start=\"230\" data-end=\"278\">direct impact on your daily power generation<\/strong>\u2014the <strong data-start=\"283\" data-end=\"310\">temperature coefficient<\/strong>.<\/p>\n<hr data-start=\"313\" data-end=\"316\" \/>\n<h2 data-section-id=\"bgkd2r\" data-start=\"318\" data-end=\"353\">What Is Temperature Coefficient?<\/h2>\n<p data-start=\"355\" data-end=\"468\">The <strong data-start=\"359\" data-end=\"386\">temperature coefficient<\/strong> tells you <strong data-start=\"397\" data-end=\"467\">how much a solar panel\u2019s efficiency drops as temperature increases<\/strong>.<\/p>\n<p data-start=\"470\" data-end=\"627\">Solar panels are tested under standard conditions (25\u00b0C). But in real life\u2014especially in Chennai\u2014panel temperatures can easily reach <strong data-start=\"603\" data-end=\"626\">60\u201370\u00b0C on rooftops<\/strong>.<\/p>\n<p data-start=\"629\" data-end=\"701\">The coefficient is usually expressed as a percentage per degree Celsius.<\/p>\n<p data-start=\"703\" data-end=\"715\">For example:<\/p>\n<ul data-start=\"716\" data-end=\"808\">\n<li data-section-id=\"nhumd1\" data-start=\"716\" data-end=\"808\">A panel with <strong data-start=\"731\" data-end=\"744\">-0.35%\/\u00b0C<\/strong> means:\n<ul data-start=\"754\" data-end=\"808\">\n<li data-section-id=\"d2yuv9\" data-start=\"754\" data-end=\"808\">For every 1\u00b0C rise above 25\u00b0C, output drops by 0.35%<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><a href=\"https:\/\/skssynergies.com\/blog\/ongrid-solar-system-chennai\/\"><span style=\"color: #0000ff;\"><em><strong>Ongrid solar system Chennai home<\/strong><\/em><\/span><\/a><\/h2>\n<hr data-start=\"810\" data-end=\"813\" \/>\n<h2 data-section-id=\"5o5vj9\" data-start=\"815\" data-end=\"832\">Simple Formula<\/h2>\n<p data-start=\"834\" data-end=\"871\"><span class=\"inline-block align-middle\"><span class=\"katex\"><span class=\"katex-mathml\">P=Prated\u00d7(1+\u03b3(T\u221225))P = P_{rated} \\times \\left(1 + \\gamma (T &#8211; 25)\\right)<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">P<\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mord mathnormal\">P<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mathnormal mtight\">r<\/span><span class=\"mord mathnormal mtight\">a<\/span><span class=\"mord mathnormal mtight\">t<\/span><span class=\"mord mathnormal mtight\">e<\/span><span class=\"mord mathnormal mtight\">d<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mbin\">\u00d7<\/span><\/span><span class=\"base\"><span class=\"minner\"><span class=\"mopen delimcenter\">(<\/span><span class=\"mord\">1<\/span><span class=\"mbin\">+<\/span><span class=\"mord mathnormal\">\u03b3<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">T<\/span><span class=\"mbin\">\u2212<\/span><span class=\"mord\">25<\/span><span class=\"mclose\">)<\/span><span class=\"mclose delimcenter\">)<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<p data-start=\"873\" data-end=\"881\">Where:<\/p>\n<ul data-start=\"882\" data-end=\"1062\">\n<li data-section-id=\"aq3s2y\" data-start=\"882\" data-end=\"913\"><span class=\"katex\"><span class=\"katex-mathml\">PP<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">P<\/span><\/span><\/span><\/span> = Actual power output<\/li>\n<li data-section-id=\"1n25yz0\" data-start=\"914\" data-end=\"968\"><span class=\"katex\"><span class=\"katex-mathml\">PratedP_{rated}<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mord mathnormal\">P<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mathnormal mtight\">r<\/span><span class=\"mord mathnormal mtight\">a<\/span><span class=\"mord mathnormal mtight\">t<\/span><span class=\"mord mathnormal mtight\">e<\/span><span class=\"mord mathnormal mtight\">d<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span> = Rated power at standard conditions<\/li>\n<li data-section-id=\"ypmgfz\" data-start=\"969\" data-end=\"1026\"><span class=\"katex\"><span class=\"katex-mathml\">\u03b3\\gamma<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">\u03b3<\/span><\/span><\/span><\/span> = Temperature coefficient (negative value)<\/li>\n<li data-section-id=\"yjcvim\" data-start=\"1027\" data-end=\"1062\"><span class=\"katex\"><span class=\"katex-mathml\">TT<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">T<\/span><\/span><\/span><\/span> = Panel temperature in \u00b0C<\/li>\n<\/ul>\n<hr data-start=\"1064\" data-end=\"1067\" \/>\n<h2 data-section-id=\"1ybce9k\" data-start=\"1069\" data-end=\"1112\">Why Solar Panels Lose Efficiency in Heat<\/h2>\n<p data-start=\"1114\" data-end=\"1236\">Solar panels generate electricity using sunlight, but <strong data-start=\"1168\" data-end=\"1208\">excess heat actually reduces voltage<\/strong>, which lowers power output.<\/p>\n<p data-start=\"1238\" data-end=\"1241\">So:<\/p>\n<ul data-start=\"1242\" data-end=\"1286\">\n<li data-section-id=\"91djth\" data-start=\"1242\" data-end=\"1266\">More sunlight = good<\/li>\n<li data-section-id=\"st7tdr\" data-start=\"1267\" data-end=\"1286\">More heat = bad<\/li>\n<\/ul>\n<p data-start=\"1288\" data-end=\"1350\">That\u2019s why temperature coefficient is critical in hot regions.<\/p>\n<hr data-start=\"1352\" data-end=\"1355\" \/>\n<h2 data-section-id=\"1g2lke8\" data-start=\"1357\" data-end=\"1403\">Chennai Reality: Why This Matters More Here<\/h2>\n<p data-start=\"1405\" data-end=\"1417\">Chennai has:<\/p>\n<ul data-start=\"1418\" data-end=\"1514\">\n<li data-section-id=\"bdjbrb\" data-start=\"1418\" data-end=\"1457\">High ambient temperatures (30\u201340\u00b0C)<\/li>\n<li data-section-id=\"10isru5\" data-start=\"1458\" data-end=\"1477\">Strong sunlight<\/li>\n<li data-section-id=\"17m7ax1\" data-start=\"1478\" data-end=\"1514\">Concrete rooftops that trap heat<\/li>\n<\/ul>\n<p data-start=\"1516\" data-end=\"1596\">This causes panel surface temperatures to rise much higher than air temperature.<\/p>\n<p data-start=\"1598\" data-end=\"1625\">Typical rooftop conditions:<\/p>\n<ul data-start=\"1626\" data-end=\"1682\">\n<li data-section-id=\"12pmtwx\" data-start=\"1626\" data-end=\"1651\">Air temperature: 35\u00b0C<\/li>\n<li data-section-id=\"1lputl\" data-start=\"1652\" data-end=\"1682\">Panel temperature: 60\u201370\u00b0C<\/li>\n<\/ul>\n<p data-start=\"1684\" data-end=\"1761\">That\u2019s <strong data-start=\"1691\" data-end=\"1724\">35\u201345\u00b0C above test conditions<\/strong>, leading to significant energy loss.<\/p>\n<hr data-start=\"1763\" data-end=\"1766\" \/>\n<h2 data-section-id=\"tuuuf5\" data-start=\"1768\" data-end=\"1800\">Real Example (Chennai Summer)<\/h2>\n<p data-start=\"1802\" data-end=\"1827\">Let\u2019s compare two panels:<\/p>\n<h3 data-section-id=\"hdbsrv\" data-start=\"1829\" data-end=\"1841\">Panel A:<\/h3>\n<ul data-start=\"1842\" data-end=\"1882\">\n<li data-section-id=\"18n7ztx\" data-start=\"1842\" data-end=\"1882\">Temperature coefficient: <strong data-start=\"1869\" data-end=\"1882\">-0.40%\/\u00b0C<\/strong><\/li>\n<\/ul>\n<h3 data-section-id=\"hdbsqw\" data-start=\"1884\" data-end=\"1896\">Panel B:<\/h3>\n<ul data-start=\"1897\" data-end=\"1937\">\n<li data-section-id=\"11pdxs2\" data-start=\"1897\" data-end=\"1937\">Temperature coefficient: <strong data-start=\"1924\" data-end=\"1937\">-0.30%\/\u00b0C<\/strong><\/li>\n<\/ul>\n<p data-start=\"1939\" data-end=\"1973\">If panel temperature reaches 65\u00b0C:<\/p>\n<ul data-start=\"1975\" data-end=\"2012\">\n<li data-section-id=\"8rgm8n\" data-start=\"1975\" data-end=\"2012\">Temperature rise = 65 &#8211; 25 = 40\u00b0C<\/li>\n<\/ul>\n<p data-start=\"2014\" data-end=\"2025\">Power loss:<\/p>\n<ul data-start=\"2026\" data-end=\"2101\">\n<li data-section-id=\"1fgk7jp\" data-start=\"2026\" data-end=\"2064\">Panel A: 40 \u00d7 0.40% = <strong data-start=\"2050\" data-end=\"2062\">16% loss<\/strong><\/li>\n<li data-section-id=\"mucjp1\" data-start=\"2065\" data-end=\"2101\">Panel B: 40 \u00d7 0.30% = <strong data-start=\"2089\" data-end=\"2101\">12% loss<\/strong><\/li>\n<\/ul>\n<p data-start=\"2103\" data-end=\"2158\">\ud83d\udc49 That\u2019s a <strong data-start=\"2115\" data-end=\"2142\">4% difference in output<\/strong>, every hot day.<\/p>\n<p data-start=\"2160\" data-end=\"2245\">Over a year, this becomes a <strong data-start=\"2188\" data-end=\"2244\">big difference in electricity generation and savings<\/strong>.<\/p>\n<hr data-start=\"2247\" data-end=\"2250\" \/>\n<h2 data-section-id=\"j0qi4d\" data-start=\"2252\" data-end=\"2290\">Good vs Bad Temperature Coefficient<\/h2>\n<ul data-start=\"2292\" data-end=\"2414\">\n<li data-section-id=\"c8oko9\" data-start=\"2292\" data-end=\"2341\"><strong data-start=\"2294\" data-end=\"2317\">Better (lower loss)<\/strong>: around <strong data-start=\"2326\" data-end=\"2339\">-0.30%\/\u00b0C<\/strong><\/li>\n<li data-section-id=\"1v23y7y\" data-start=\"2342\" data-end=\"2379\"><strong data-start=\"2344\" data-end=\"2355\">Average<\/strong>: around <strong data-start=\"2364\" data-end=\"2377\">-0.35%\/\u00b0C<\/strong><\/li>\n<li data-section-id=\"o5607z\" data-start=\"2380\" data-end=\"2414\"><strong data-start=\"2382\" data-end=\"2390\">Poor<\/strong>: <strong data-start=\"2392\" data-end=\"2414\">-0.40%\/\u00b0C or worse<\/strong><\/li>\n<\/ul>\n<p data-start=\"2416\" data-end=\"2487\">\ud83d\udc49 The closer the value is to zero, the better the performance in heat.<\/p>\n<hr data-start=\"2489\" data-end=\"2492\" \/>\n<h2 data-section-id=\"1ge4658\" data-start=\"2494\" data-end=\"2533\">Which Panels Perform Better in Heat?<\/h2>\n<h3 data-section-id=\"lyn28a\" data-start=\"2535\" data-end=\"2552\">TOPCon Panels<\/h3>\n<ul data-start=\"2553\" data-end=\"2680\">\n<li data-section-id=\"40ayiv\" data-start=\"2553\" data-end=\"2605\">Typically have <strong data-start=\"2570\" data-end=\"2605\">better temperature coefficients<\/strong><\/li>\n<li data-section-id=\"1rm4o35\" data-start=\"2606\" data-end=\"2647\">Perform more efficiently in high heat<\/li>\n<li data-section-id=\"11tw7xs\" data-start=\"2648\" data-end=\"2680\">Ideal for Chennai conditions<\/li>\n<\/ul>\n<hr data-start=\"2682\" data-end=\"2685\" \/>\n<h3 data-section-id=\"1f87x9g\" data-start=\"2687\" data-end=\"2707\">Mono PERC Panels<\/h3>\n<ul data-start=\"2708\" data-end=\"2804\">\n<li data-section-id=\"1knqgar\" data-start=\"2708\" data-end=\"2742\">Slightly higher losses in heat<\/li>\n<li data-section-id=\"rtkpv\" data-start=\"2743\" data-end=\"2804\">Still reliable but less efficient in extreme temperatures<\/li>\n<\/ul>\n<hr data-start=\"2806\" data-end=\"2809\" \/>\n<h3 data-section-id=\"pfuk94\" data-start=\"2811\" data-end=\"2830\">Bifacial Panels<\/h3>\n<ul data-start=\"2831\" data-end=\"2934\">\n<li data-section-id=\"v7xygq\" data-start=\"2831\" data-end=\"2888\">Can help slightly due to better airflow (if elevated)<\/li>\n<li data-section-id=\"c0yrw4\" data-start=\"2889\" data-end=\"2934\">But temperature coefficient still matters<\/li>\n<\/ul>\n<hr data-start=\"2936\" data-end=\"2939\" \/>\n<h2 data-section-id=\"1a7mcd6\" data-start=\"2941\" data-end=\"2983\">How to Reduce Heat Loss on Your Rooftop<\/h2>\n<p data-start=\"2985\" data-end=\"3039\">Even with a good panel, installation plays a big role.<\/p>\n<h3 data-section-id=\"wgikty\" data-start=\"3041\" data-end=\"3062\">1. Elevate Panels<\/h3>\n<ul data-start=\"3063\" data-end=\"3134\">\n<li data-section-id=\"ud3t4k\" data-start=\"3063\" data-end=\"3101\">Leave space between roof and panel<\/li>\n<li data-section-id=\"123e79p\" data-start=\"3102\" data-end=\"3134\">Improves airflow and cooling<\/li>\n<\/ul>\n<h3 data-section-id=\"ciymj\" data-start=\"3136\" data-end=\"3172\">2. Use Proper Mounting Structure<\/h3>\n<ul data-start=\"3173\" data-end=\"3222\">\n<li data-section-id=\"ivlbmh\" data-start=\"3173\" data-end=\"3222\">Avoid flush mounting directly on hot concrete<\/li>\n<\/ul>\n<h3 data-section-id=\"b0lsg4\" data-start=\"3224\" data-end=\"3264\">3. Choose Light-Colored Roof Coating<\/h3>\n<ul data-start=\"3265\" data-end=\"3312\">\n<li data-section-id=\"crnwoe\" data-start=\"3265\" data-end=\"3312\">Reflects heat and reduces panel temperature<\/li>\n<\/ul>\n<h3 data-section-id=\"1tl82xr\" data-start=\"3314\" data-end=\"3347\">4. Select High-Quality Panels<\/h3>\n<ul data-start=\"3348\" data-end=\"3407\">\n<li data-section-id=\"16gvlm1\" data-start=\"3348\" data-end=\"3407\">Lower temperature coefficient = better long-term output<\/li>\n<\/ul>\n<hr data-start=\"3409\" data-end=\"3412\" \/>\n<h2 data-section-id=\"1httdyb\" data-start=\"3414\" data-end=\"3446\">Why This Affects Your Savings<\/h2>\n<p data-start=\"3448\" data-end=\"3471\">Higher heat loss means:<\/p>\n<ul data-start=\"3472\" data-end=\"3569\">\n<li data-section-id=\"o7qnb0\" data-start=\"3472\" data-end=\"3504\">Less daily energy generation<\/li>\n<li data-section-id=\"7rzzhe\" data-start=\"3505\" data-end=\"3543\">Lower savings on electricity bills<\/li>\n<li data-section-id=\"roug37\" data-start=\"3544\" data-end=\"3569\">Longer payback period<\/li>\n<\/ul>\n<p data-start=\"3571\" data-end=\"3698\">In Chennai, where heat is constant, even a small efficiency difference can result in <strong data-start=\"3656\" data-end=\"3697\">thousands of units lost over 25 years<\/strong>.<\/p>\n<hr data-start=\"3700\" data-end=\"3703\" \/>\n<h2 data-section-id=\"1jmkquq\" data-start=\"3705\" data-end=\"3721\">Final Verdict<\/h2>\n<ul data-start=\"3723\" data-end=\"3970\">\n<li data-section-id=\"lrxbca\" data-start=\"3723\" data-end=\"3817\">Temperature coefficient is one of the <strong data-start=\"3763\" data-end=\"3815\">most important factors for Chennai solar systems<\/strong><\/li>\n<li data-section-id=\"7cgyd0\" data-start=\"3818\" data-end=\"3904\">Panels with <strong data-start=\"3832\" data-end=\"3902\">lower (better) coefficients perform significantly better in summer<\/strong><\/li>\n<li data-section-id=\"bzj98s\" data-start=\"3905\" data-end=\"3970\">Ignoring this can reduce your system\u2019s real-world performance<\/li>\n<\/ul>\n<p data-start=\"3972\" data-end=\"4117\">\ud83d\udc49 For Chennai homes in 2026:<br data-start=\"4001\" data-end=\"4004\" \/>Choose panels with <strong data-start=\"4023\" data-end=\"4046\">-0.30%\/\u00b0C or better<\/strong>, preferably <strong data-start=\"4059\" data-end=\"4080\">TOPCon technology<\/strong>, for maximum efficiency and savings.<\/p>\n<hr data-start=\"4119\" data-end=\"4122\" \/>\n<h2 data-section-id=\"1xvwnkw\" data-start=\"4124\" data-end=\"4131\">FAQs<\/h2>\n<h3 data-section-id=\"1pmm32o\" data-start=\"4133\" data-end=\"4196\">1. What is a good temperature coefficient for solar panels?<\/h3>\n<p data-start=\"4197\" data-end=\"4255\">Anything around <strong data-start=\"4213\" data-end=\"4235\">-0.30%\/\u00b0C or lower<\/strong> is considered good.<\/p>\n<h3 data-section-id=\"qhwrnk\" data-start=\"4257\" data-end=\"4315\">2. Does higher temperature always reduce solar output?<\/h3>\n<p data-start=\"4316\" data-end=\"4381\">Yes. Heat reduces voltage, which lowers overall power generation.<\/p>\n<h3 data-section-id=\"1myfbn4\" data-start=\"4383\" data-end=\"4448\">3. Is temperature coefficient more important than efficiency?<\/h3>\n<p data-start=\"4449\" data-end=\"4504\">In hot cities like Chennai, both are equally important.<\/p>\n<h3 data-section-id=\"tdtzr1\" data-start=\"4506\" data-end=\"4548\">4. Do all panels heat up the same way?<\/h3>\n<p data-start=\"4549\" data-end=\"4609\">No. Design, materials, and installation affect heat buildup.<\/p>\n<h3 data-section-id=\"13j6lvv\" data-start=\"4611\" data-end=\"4661\">5. Can installation reduce temperature losses?<\/h3>\n<p data-start=\"4662\" data-end=\"4734\">Yes. Proper elevation and airflow can significantly improve performance.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When choosing solar panels for a hot city like Chennai, most people focus on wattage and efficiency. But there\u2019s another factor that has a direct impact on your daily power generation\u2014the temperature coefficient. What Is Temperature Coefficient? The temperature coefficient tells you how much a solar panel\u2019s efficiency drops as temperature increases. Solar panels are [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_joinchat":[],"footnotes":""},"categories":[1],"tags":[],"class_list":["post-686","post","type-post","status-publish","format-standard","hentry","category-solar-panel"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Solar Panel Temperature Coefficient Explained<\/title>\n<meta name=\"description\" content=\"Understand solar panel temperature coefficient and why it matters for maximising output on Chennai rooftops in extreme summer heat.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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