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Jeff,
More data points. My boat has a 16 cubic foot top-loading refer with small freezer compartment on one end, medium to poor insulated like yours. No holding plates.
The 20-year old air-cooled Adler-Barber draws over 6 amps, and runs 75-80% of the time in 80-deg ambient temp. Same draw as yours...over 100AH per 24-hour period.
Bill
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