They should have a diode in series to prevent discharge of the battery when night falls. Admittedly the small ones will not be too good, but there are now the poly and mono crystelline types which charge without direct sunlight.
They should have a diode in series to prevent discharge of the battery when night falls. Admittedly the small ones will not be too good, but there are now the poly and mono crystelline types which charge without direct sunlight.
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