I think you will find two batteries are not enough to be practical. As noted above it depends on the weather, your battery age, fridge use, etc. We have a 4 battery system for our residential fridge. If the weather is <90 degrees we are OK if we run the generator for 1.5-2 hours in the AM and 1-2 hrs in the late afternoon. We use that same time to run the microwave, shower, and other large power needs. Overnight our voltage drops to 11.9- 12.0
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