I'm attempting an interesting project, but wanted to gather initial assistance and advice from the Talkbass community before even trying. Essentially, I would like to build an amp or amp/cabinet capable of producing adequate acoustic/coffeehouse levels of volume but powered entirely with renewable energy. No, this isn't meant to replace conventional needs, but rather act as a standalone exhibit that is also practical. Here's my ideas and musings thus far: It would be difficult to provide the voltage/amps required of most existing systems from a small photovoltaic system wind, except maybe pedal powered generators. Therefore, a new amplifier would be needed... TO keep things cheaper and simple, the power source would most likely be coming from solar, and therefore a DC current. Storage would be ideal (to play in low-light and indoor conditions). This could utilize a battery, or even a car battery, etc. As far as the speaker and amplifier, I do not have much electronic engineering expertise. I was thinking that car audio would be the place to source these items, being that they are already meant to run on a DC circuit. Perhaps an amplifier for a subwoofer and a car audio subwoofer/box. Plus, with the rate that my generation likes to 'pimp' their rides with these obnoxious systems, I'm sure there are plenty of cheap, used parts out there. That's a just a little bit of what I've been thinking. I could also use help designing the cabinet box itself, but that will be later in development. So fellow Talkbass community members: Is that at all possible? And would anyone have any ideas/advice?