165 Watt Solar Panel for Charging 12 Volt Battery; RV, Boat, High Efficiency! Made in USA! 165 watts solar panel for charging 12 volt battery; Highest Efficiency 165 Watt Solar Panel on the market! Ideal for charging 12 or 24 volt batteries in an off-grid system; Made in U.S.A.! Please call (510-498-8221) or email us via Amazon for volume discount.