20W DC5V Monocrystalline Ultra-thin Solar Panel Rear Wiring USB Port with Cable
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This panel measures 254mm x 386mm for solar, less the areas covered by conductors or open between cells. The gross solar input is 98.04W at the AM1.5 standard. At assumed 20% efficiency, the output is 19.61W. Test values of 0.91A at 16.91V resulted in a calculated 15.3881W. The sun was measured at 100,000LUX at 34 north on 2022/02/23. At AM1.5 there should be about 10% more power. Considering the additional 10% and conductor losses, this panel outputs close to what its area predicts and close to the advertised wattage. The USB output will be less.
fast and perfect as always
On a bright sunny day at the end of July/Seattle latitude, one hour past the peak sun, the unit charged a 12V battery at only 8 watts.