I've no idea what the batteries are TBH. I've not found THE boat yet
I have got plans for it though - if the batteries aren't up to par, I'm going to install my own array of them. As for lighting etc. I'm on that too - I imagine it can get gloomy in winter. I'm also going to add a solar array to the roof (built by myself - keeping the ol' costs down!). I've done a bit of digging around and I'm probably going to create my own panel with an Arduino for checking battery levels and controlling the on board electronics.
As I don't have much money, I plan to get a boat that could do with some TLC. That way I won't feel bad about ripping it up to do it up to my specs (and I can get a bigger boat for the money!) Now I've wrote it all down, I'm not sure how the missus is going to react to living on a floating project!
Back on topic....
I suppose even at 90% efficiency, Its better to have some half decent speakers than trying to botch some 12V solution. My original thought was that inverters were ridiculously inefficient (like 50% or something).
Good point - I might get one of them power usage meters and see how much power the computer takes at full pelt. I would ideally like to take my computer rather than a laptop.
Thanks again charlton! Legend!