[Destroyer]

Originally Posted by 1BadTitan

Damn, that kinda sucks... I was hopiong it would be enough for some LED lighting and an A/V system.
I'm looking at a double din stereo that has a dvd player with external video output that will be run to a 20" flat panel in the cuddy for my kids. I was aslo gonna run an amp, maybe a 200w to power a small sub and 6 6 1/2" speakers.

So, how much power do you figure you'll need, and for how long? If you want to know how many watts are in a single amp, you need to know the voltage. As an example, if you use a standard 12 volt circuit for your voltage the equation for determining how many watts are in an ampere is Watts = Volts x Amps. So it would be 12 volts x 16 amps = 192 watts. Not enough for a 200w system to recharge, but it would slow the drain to almost nothing. Maybe a 100w system would be better? Do you really need that much power? Don't forget that essentially you're going to be in an 18' x 7' room. 100w is still enough power to crank the volume to the threshold of pain. (and less volume would probably be appreciated by your fellow boaters that don't want to hear blasting music as they fish.). LED lights need next to nothing, so don't even think about them. How much power does the LED screen take? If it were me I'd get one of those self-contained 12" or 15" battery operated units anyways. Unless it's marine grade, I don't think that 20" tv screens were really made for the harsh marine environment. All that being said, would a dual battery system work for you? Run the A/V off of one battery and only the engine off the other. Charge them up at home.