Wagan EL2448 Solar ePanel Charger for 12 V Battery 12.4 watts, folds up for convenient transport and storage, ideal for indoor and outdoor use Use to charge laptop computers, cell phones and other DC powered items High impact tempered glass to resist hail, ice, flying debris or force wind Requires only daylight (not direct sunlight), monocrystalline solar panel charges even in cloudy and overcast weather Suitable for trickle charging a wide range of batteries and power packs