Expected voltage sag?
I've got two 6 volt GC batteries. I have an inverter just powering a laptop. It's pulling under 100 watts AC. What kind of voltage sag would you expect that to put on these batteries if they were full...
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A SG check of each cell is in order, should all be within +/- 0.005. I suspect at least one battery has a weak or bad cell. At 12.3 volts you are most likely below 50% SOC. Depending what the inverter plus laptop draws, ours is 3 amps with one laptop, it should be a few days before you get to that point. But battery temp is also a factor here at -1C.
