Well that's kind of the problem..the charge voltage was if anything high, which I'm scratching my head over. But the "sag" was the tell - after the bank was drained a bit I put a 100amp load tester on each battery and I actually had 3 that failed including the one with the nearly dry cell.
I'm just going to pull them out of circuit for now - 230AH is fine for most days and I've now got some telecom powersupplies which can actually kill my 2KW generator - gives me enough power for get-home. I am wired as 4 (series) banks of 3 (par) for 48V. It will be 4x2 after pulling them (this config is apparently non-optimal and may partially explain the problem - reading suggests parallel bad, series good)
I'll get what credit I can from wal-mart for the old ones (amazingly..
So a smaller bank and being more diligent about running the genset when I read the tide-table upside-down should work better.
-Keith
--- In electricboats@
>
> Keith,
>
> I keep thinking about your motoring range issue and your comment about a bad battery. I have read in a few places that a bad battery in a string will significantly reduce range. What kind of voltage differences did you have? Do you have one big bank or two separate banks?
>
> Thanks, Mark F
>
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