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With two 6 volt batteries I would get about 200 usable Ah versus 85 usable Ah with the two 12 volt batteries. That's the way I understand it. I should correct myself in the first post in talking about the drop in voltage possibly being caused by too small a gauge wire. Again as I understand it...

Thanks, Carl, for the input. I get the battery stress test done in a couple of days. It sounds like we are/were dealing with the same thing. I hadn't thought about the Zamp controller overcharging but I have wondered if the converter's "smart" charger was a culprit. If the batteries fail the...

I have a CR85 Isotherm refrigerator in a 2016 Fleet and recently have had the voltage drop to 10.5 volts on three occasions. The drop occurred after the fridge had been running almost continuously for 10 hours, using about 25 Ah each session. I have two AGM batteries less than two years old and...