I just bought one of these for about 30 bucks in order to charge up individual batteries for a battery bank as some point. In the meantime, what else could I do with it? Could I charge up a capacitor bank for example? How about running whatever power the sun gives during the day and feeding it back into the grid? May not be much power but it ought to save me some money in relation to the electric bill I assume. Any thoughts or ideas would be appreciated.