If you forget and leave the amp on, you might want to think about the fact that a class D amp will not drain the batteries nearly as quickly!
Seriously, if I were you I would be looking at speakers that are easy to drive. When you make an amplifier work hard, not only will it have higher distortion but it will draw more power from the wall.
A more efficient speaker might mean that the amps only make 15 watts. That's low enough power that you could even use tubes! With a class D amp the power drain would be insubstantial.
A friend of mine lives off grid FWIW...
Seriously, if I were you I would be looking at speakers that are easy to drive. When you make an amplifier work hard, not only will it have higher distortion but it will draw more power from the wall.
A more efficient speaker might mean that the amps only make 15 watts. That's low enough power that you could even use tubes! With a class D amp the power drain would be insubstantial.
A friend of mine lives off grid FWIW...