Reward for lost Kraken!
Join Date: Apr 2006
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" I'm thinking that I need to connect those 2 as a single bank for house batteries and get a new starting battery"
This is a good idea--and the way things are often being done these days, instead of the old a/b banks. Among other things you get better life from the deep cycle batteries, because you are discharging them to less depth, and you can use a smaller cheaper starting battery, which won't hurt when it needs replacement. And it will last a long time, since it is only doing "SLI" duty. (Starting/Lights/Ignition, aka a car battery.)
I didn't check the numbers (have to scroll too much & I've had my share of sun and heat today, thank you) but would agree that stereos are most often loosely rated--and when the volume gets cranked and everyone is happy...it's a good thing to have a separate starting battery on the boat.
Seems like you're burning 186AH/day, plus another 200+ for the stereo. I like music sometimes too--but that's a heck of a power bill. If you figure that as 400AH per day, you'd want an 800AH battery bank to support it, so it was discharged only to 50% then recharged every day. How big a boat is this on??
I'd like into high efficiency stereo speakers (they vary widely, 10x from some to others) and find out what kind of amplifier the stereo uses. I don't remember the pros/cons of the different types but again--some consume 2x-3x more power than others, all the time. "Car" stereos usually are built with no regard for power consumption since there's an engine assumed. Some real sleuthing with some audio folks could cut that power use in half--without losing anything more than some cost up front.
And, it sounds like you seriously want a wind generator or other continuous power charging system to help defray that energy budget.