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True residential refrigerators designed for homes are not designed for RV use, hence the new trend towards manufacturers designing RV-specific compressor refrigerators. The cheapest run on 115 Volt AC power so need an inverter when powered by batteries, but many run on DC power directly from battery bank. DC would be my personal choice if buying a new fridge, provided it has a quality compressor.
Anyway, I was interested in general data for the Whirlpool and Samsung refrigerators mentioned in the OP, and found the following. The Samsung is more efficient, but not by as much as claimed when measured over long instead of instantaneous periods. Maybe the “inverter” fridge the OP mentioned was a different model.
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