Hyundai 645W 156 Half-Cell 1500V TOPCon Silver Bifacial Solar Panel

The 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.