Originally posted by cracovian
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The nominal energy storage of each of your 12V batteries is ~2.35kWh (13.08*180). So you got about 72% (1.69/2.35) of the rated capacity out of the battery. You said on your first post that the batteries were all reading 13.37V. If the batteries had been sitting without any use for a long period of time this voltage should equate to a battery over 90% full. If the 1.69kWh from the Xantrex is the output power you will have to add the inverter losses, might be as high as 15%-20% because of the low power draw.
10.9V shutdown is fine, corresponds to ~2.7V/cell (10.9/4). Discharging at 100W (~.05C, 100*180/13.08) and cutting out at 10.9 would mean you would have somewhere around 5% left in the battery.
Charging at 2A is going to take 90 hours to charge the battery.
Simon
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