Mike,
A trick for cheap/easy battery monitoring:
1. Use the boat, then measure each battery's voltage to find your weakest (lowest voltage) battery. By the time you measure the last battery, the first battery has recovered noticeably, so either wait at least 1/2 hour, (still recovering, but changing more slowly) or just mentally account for the climbing voltages of each battery.
2. charge, then again find your weakest (lowest voltage) battery (should be the same one).
3. repeat 1 and 2, just to see if your system is stable.
4. repeat 1 and 2 at least yearly.
5. keep a visually accessible cheap digital voltmeter on that one weakest battery.
6. if you have AGMs, also monitor the highest voltage battery (it is usually the first to die when series charging AGMs).
In other words, instead of monitoring all the batteries, just take care of the one likely to die first.
Mark Stafford
> From: Mike <biankablog@
> Subject: [Electric Boats] An electric cruise to and from New York and a battery question.
> To: "ELECTRIC BOATS" <electricboats@
> Date: Tuesday, September 22, 2009, 2:40 PM
>
> I just completed a 140 mile cruise....
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