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post #22 of Old 08-12-2013
mitiempo
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Re: understand 12v electrical

Quote:
Originally Posted by kentobin View Post
Battery Maintenance Facts

State of Charge Specific Gravity Voltage - 12V Voltage - 6V
100% 1.265 12.7 6.3
75% 1.225 12.4 6.2
50% 1.190 12.2 6.1
25% 1.155 12.0 6.0
Discharged 1.120 11.90 6.0
* Sulfation of Batteries starts when specific gravity falls below 1.225 or voltage measures less than 12.4 (12v Battery) or 6.2 (6 volt battery).
True, but a 20 hour test brings the battery down to 10.5 volts. The load should be 5% of battery or bank size for accuracy. If you can't get it exact don't bother trying - you already have an inaccurate AH estimation and don't need another one.

I don't expect the issue to be the batteries, but the monitor.

Brian
Living aboard in Victoria Harbour
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