Just re-read Marks original "battery #1 low" post. Seems that it was DURING charging. Kind of calls my "surface charge" speculation into question I think.
Hmmm.
--- In electricboats@yahoogroups.com, "luv2bsailin" <luv2bsailin@...> wrote:
>
> Hi guys,
> Maybe that few mA the Paktraker uses is enough to bleed off the surface charge. Are those lower readings showing up after the bank is charged, with no load? If so, that may be the case. It would be interesting to know what they read after running awhile. I would guess that should pretty well even them out, or at least swamp out any surface charge effects. The real test would be to graph out the individual voltages over time during a run and compare the slopes. If you run at a steady amp draw until you see a rapid increase in rate of drop (a "knee" in the slope), you'll have a pretty good indication of actual capacity at that particular amp draw. I don't know at what DoD that knee normally occurs, but I have seen it on several plots I've taken and would consider it the "darn-near-dead" (DnD?) point for all practical purposes.
> Anyhow, all my boat projects are on ice (literally) for the winter, so I hope you all don't mind me throwing my $.02 into the mix in an attempt at a little vicarious tinkering and troubleshooting. I haven't paid that much attention to the finer points of battery string management so I find this thread very interesting and educational.
> Cheers,
> Jim McMillan
>
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