ALLPOWERS: 7.5W Solar Car Battery Charger
SunPower is 23.5% Efficient
ALLPOWERS car battery charger can charge 12V batteries with the power of the sun and create 7.5 watts of energy, the efficiency of SunPower is 23.5%, while most monocrystalline panel in the market is only 17% SunPower solar panel works in all daylight conditions and is water resistant（rain drop is OK, but not completely waterproof）for added durability works with automotive, motorcycle, tractor, boat batteries, car battery and more built-in blocking diode to prevent reverse discharge, not only maintains the battery lifetime but also extends its usage life.
