Originally Posted by
LordFoo
Hmm.. I know I've seen guitar amps that run off a battery (Pignose?) How about a car battery (or several, in parallel, depending on weight) and an inverter for an off-the-shelf solution? (Although, I don't think car batteries do well when they go through complete drain/charge cycles)
Car stereo amps run off 12V or a bit more DC so just use one of those. You can use "marine" deep cycle batteries for repeated cycling although for a good car amp and a good deep cycle battery you're looking at a fair chunk of cash- and you haven't even got speakers or the enclosures yet. Also, them batteries weigh about 50lbs (not exaggerating)
THEN you still have the issue of run time. How much power are you thinking? I'd say you'd want at least 50W if you plan to use it in an outdoor environment. Back in my pimped out honda car stereo days my battery would last around 30-45mins before dying in the car. (~400W)
Also, at low wattages depending what subs you're running you might want to think about adding a capacitor to help prevent underpowering your speaker.