Assuming they are using LiFePO4 cells which I think is likely, as long as you keep the cell voltages in the range 3.45V-3.10V/cell (13.8V-12.4V,~100%-20%SOC) under load or when being charged you should get good use out of them. LFP batteries are happy being deep cycled.
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
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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