The great thing about Raspberry Pis, compared to Arduinos, is that you don't have to scour Amazon or your local electronics shop for a high-quality power supply to drive your board. Raspberry Pi ...
4.14 Finally, multiply 174 by 1.25 = 217.5 (approximate to 220) watts of solar panels, which accounts for inefficiency of 25%. This is the minimum solar panels needed to power this solar refrigerator.