Higher voltage should not be an issue with a true deep cycle lead acid battery. The heavier 2vdc cells and 4 and 6vdc batteries don't care.
12vdc deep cycle batteries are often not true deep cycle, it's just hard to do. Usually they are compromise - dual purpose starting/house batteries. Remember starting batteries are designed for high current over a short time (thin plates with a lot of surface area), while, deep cycle batteries provide a modest amount of current over a long period (big thick plates.) You could do both with a big enough deep cycle battery so that the high current is only a modest load for that battery. It be hard to imagine any pleasure boat engine couldn't be started by 6, 2vdc (1000 ah/20 hr rate) cells in series. Of course, your 12vdc 1000 ah battery should be used to replace your ballast, since with box it would weight 1200 pounds or more.
Weight btw is a good way to compare 2 batteries claiming to be deep cycle lead-acid batteries, providing X amp hours, the heavier battery will almost always last longer.
--- In electricboats@yahoogroups.com, Jennifer Richards <jennifer_c_richards@...> wrote:
>
> From what I understand of it, having higher voltage means you can use
> thinner gauge cable and reduce transmission loss. However with batteries
> comes the issue of whether higher voltage will be detrimental to the
> individual batteries in series, plus the higher the total voltage of the
> system the more potential for shorting. Secondly it all comes down to
> matching the voltage required by the motor.
>
>
> In the case of the OZ motor it can run up to 96v; but to do so reduces
> the life of the motor considerably, and this is why I like to know all
> about the whole system. It is cheaper for a manufacturer to run a
> smaller motor to death, but use a cheaper (less efficient or smaller and
> therefore overpowered) motor than run a better motor at a lower voltage
> to get the most out of it.
>
> Jeny
>
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