Sub amp modules?

I have no experience running things from batteries but... :)

You might try a TC2000 + STA517B board:
41Hz Audio:AMP11-HV kit (50V)
Hifimediy (T3)

Or I think (not sure) you could use 2x 24V batteries in series with gnd at center to provide +-24V and use this one bridged:
Connexelectronic
Undervoltage protection is at 23V, you might have to ask Cristi whether it would work.


None of these options will get you anywhere near 200W into 8ohms though. You'll need a lower impedance driver, or a step-up voltage transformer.

:)