Originally Posted by Griff (Post 3268258)

I run all of my stereo off of one Interstate group 29M deep cycle battery. The head unit is wired into a switch at the helm, but everything else is wired to the 29M. The head unit really doesn't pull hardly any power since the internal amp is switched to off. I have 8 speakers, 2 subs, a PDX 4.150 and PDX 4.100 bridged. I've never run the battery down so low that the stereo would cut out. I've run it at 3/4 volume 3-4 hours.
I have 2 other group 24 batteries for starting the engines.

Originally Posted by Griff (Post 3268737)

I have 2 Perko switches. #1 on each switch is for the starting battery on each engine. #2 on both switches goes to the deep cycle. That way I can charge the deep cycle off either engine. I never put both switches on #2 when running. If I switch both switches to ALL, as long as I have one good battery, I can start both engines. I do not have an on board charger. A few times when I have run the stereo hard for a long time I will charge the deep cycle with a 10 amp charger overnight.