Re: Battery Sizing - am I crazy?
Ok well the answer is in. According to Trojan, as Mainsail said, Golf Carts will have almost 50% longer life. The tradeoff, as I suspected, is in cranking amps - apparently even the deepest "Marine Deep Cycle" battery is still designed with cranking performance in mind.
This comes directly from Trojan tech support when I asked them specifically about the differences between their SCS200 G27 and T-105 Golf Cart batteries. Credit to Trojan for the quick response.
I'll say that I find it disappointing, and counter-productive that manufactuers don't make these tradeoffs clear. There are a ton of marine buyers who want nothing but the very best deep cycle performance and published literature makes no note of these lifetime tradeoffs.
Anyway, as far as I'm concerned the verdict is in. I have little doubt that a normally sized golf cart house bank can start any engine in it's sailboat. So...
Never buy a marine battery for your boat unless you absolutely can't fit a GC.
Last edited by asdf38; 11-21-2012 at 01:11 PM.