Sunforce 50022 5-Watt Solar Battery Trickle Charger Features sturdy and durable aluminum frame with amorphous solar cells ; Includes 12V DC plug, battery clamps and mounting hardware for easy installation Completely weatherproof for added durability Amorphous solar panel works in all daylight conditions; even on cloudy days Built-in overcharge/discharge protection Maintains and trickle charges 12 Volt batteries for your car, boat, RV, electric fence, deer feeder and more