Ted, I bet you're putting too much faith in that % of charge remaining and it's causing fuzzy math results. The SOC% is known to drift on many of these meters. That's apparently what makes the Balmar SG-200 so unique in its ability to track Battery health and SOC so accurately.
Do you have a Kill-a-watt meter? If so, plug it into the fridge and let it do its monitoring for a 24 hr period. It'll provide an independent source for the watts consumed during that period.
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