If you can find true deep cycle 12V batteries, there's not really any difference. Unfortunately, some of what are sold as marine deep cycle are more like dual purpose batteries, more oomph but lower lifespan (thinner plates).
But even these differences are smaller percentages and I think that size, weight and format are more important. I suggest picking batteries that fit and that you can install without a forklift. ;) Some people prefer the simplified wiring that 12V systems can afford, but in practice, there's not that much difference there either.
Bottom line, it's your money, buy what you're comfortable with. 12V or 6V is one of the lesser decisions. You may not even be able to tell the difference.
Eric
--- In electricboats@yahoogroups.com, Daniel Michaels <nov32394@...> wrote:
>
> Thanks those figures look good to me. It boils down to 3.5 hrs @ 3 knots for 48 volt system. That's 3 hrs more than I need. Is it better to have 12 volt batteries? I thought that the 6v golf cart batteries were much better than a deep cell 12 volt.
>
> Dan
>
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