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Old 11-19-2014, 08:46 AM   #27
timjet
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Join Date: Apr 2009
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Yes Brian I think you're right. The meter estimates SOC by subtracting the amps used from the bank capacity the user initialized the unit with when installed.

In the case I mentioned above the fully charged state was not accurate because one of the batteries in the bank was dead, thus making the bank capacity less than what the unit was initially programed with.

I suppose the point I'm trying to make is that relying on just SOC may give you a false indication of the state of your batteries.

And again as you mentioned the bank capacity is just a guess so when initializing the meter you are in effect guessing. Garbage in Garbage out.
I don't have the SOC manual in front of me but I believe it says that the typical battery bank will loose 3% of it's capacity every year. I think with as much use as I've given my batteries (charge cycles) it's much more than 3%.
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