say I have 600 watts from all my amplifiers, 600w/12v = 50amps So from my battery specs, says it can run at ~1.7 hours at 25 ampere load, So is my understanding correct that Im gonna get less than an hour of power at that load? Does it always pull that load or only when really cranked loud? and is there a table that says how many amps for what guage wire? Im trying to get a system in my boat, so we would be sitting with the engine off?, but this does not seem worth it if i dnot have to restart periodically to recharge. (dual battery/isolator system btw). Thanks for the advice, im trying to do this on a budget, but not too cheap.