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Uxcell 5pcs 2v 40ma poly mini solar cell panel module diy for light toys charger 40mm x 40mm.
Only 10 left in stock order soon.
Build a solar fan with a solar panel solar motor and a propellor rotor.
Set up a monitoring station with a multimeter and solar panel.
Sold by uxcell and ships from amazon fulfillment.
Compare the efficiency of a solar panel over time without changing the angle of the panel.