I'll assume you have one 4 channel amp at 400 watts per channel,
1 sub amp at 600 watts,
1 Lincoln arc welder,
and a underdash Pioneer 8 track.
If using a home constructed 12V 400Ahr battery utilizing potatoe and sea water chemistry (about semi size) I estimate you your battery will last......
about 1.5 minutes if welding tungstun to wood.
I made a few assumptions, and maybe some are off a little.
With some refinement we can probably get closer to the truth!
No, he double posted, and couldn't delete it.
...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.