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Involvement Level: Expert (understands the inner workings)
Pros: Solar cells are immersed in resin, which reduces reflection losses, convenient contact plate.
Cons: All of those plates have different area of silicon units, so you can not build a battery of them. One of four that I bought contains 8 elements 3.5 x 25 mm, i.e. less than 20% of the area is filled with silicon. No way to provide the claimed 2V at 150 mA! Even 15 mA.
Other: Better find something else for the price. Disappointing.