For your more serious solar charging needs, we've assembled these solar battery charger packages. These solar powered chargers will charge 2-4 AA NiMH batteries in about 3-6 hrs of sun, depending on the size of the solar panel, the battery capacity, and the amount of sun and panel orientation. With a higher wattage solar panel, you'll get faster charging, the ability to solar-charge C and D batteries, and you can add a splitter to charge multiple items at the same time.