{"product_id":"hyundai-645w-156-half-cell-1500v-topcon-silver-bifacial-solar-panel","title":"Hyundai 645W 156 Half-Cell 1500V TOPCon Silver Bifacial Solar Panel","description":"\u003ch2\u003e\u003cstrong\u003eHyundai 645W 156 Half-Cell 1500V TOPCon Silver Bifacial Solar Panel\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe HD HYUNDAI ENERGY SOLUTIONS CO., LTD. HiS-T645NJ is a 645W monocrystalline solar module with a rated efficiency of 23.37%, placing it among the highest-efficiency panels in our database. At its physical size it delivers roughly 234 watts per square metre, a high power density that suits roofs where usable area is limited. Its power temperature coefficient of -0.294%\/°C is better than the ~-0.35%\/°C class average, meaning it holds output better on hot rooftops. Under normal operating cell temperature (45.12°C NOCT), real-world output is closer to 607W — about 5.9% below the lab STC rating, which is normal and useful for sizing your array against summer conditions. For system design, its open-circuit voltage (Voc) of 58V and max-power voltage (Vmp) of 47.9V determine how many panels can be safely wired in series within your inverter's voltage window. It carries a 30-year warranty.\u003c\/p\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003ePower Density\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e234 W\/m²\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— High for its class. Higher density means more power from the same roof area, which matters most when space is tight.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eReal-World Output (NOCT)\u003c\/h3\u003e\n\u003cp\u003eRated 645W at lab STC, but about\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e607W\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eat 45.12°C operating temperature (~5.9% lower). Use the NOCT figure when estimating hot-weather production.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eHeat Tolerance\u003c\/h3\u003e\n\u003cp\u003eTemperature coefficient\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e-0.294%\/°C\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003evs a ~-0.35%\/°C class average. Better than average — strong hot-climate choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eString Sizing\u003c\/h3\u003e\n\u003cp\u003eVoc\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e58V\u003c\/strong\u003e, Vmp\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e47.9V\u003c\/strong\u003e. Divide your inverter's max input voltage by the cold-weather-adjusted Voc to find the maximum panels per string.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0687\/5090\/1474\/files\/body_72c13b0f-f467-42ba-aec9-7db75c7c187d.png?v=1783613636\" alt=\"\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Hyundai","offers":[{"title":"Default Title","offer_id":48013461455074,"sku":"HiS-T645NJ","price":230.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0687\/5090\/1474\/files\/p_ic_49c70e7c-7339-4b1c-8795-90021ddccdff.png?v=1783613755","url":"https:\/\/greenvistaliving.com\/products\/hyundai-645w-156-half-cell-1500v-topcon-silver-bifacial-solar-panel","provider":"Green Vista Living","version":"1.0","type":"link"}