We have made some 16 hour pulls with both a Ford & a Ram running the refrigerator on gas and the few parasitic drains. Never had the battery discharge to where it wouldn't keep the fridge running. We do not have an inverter. Does the 50-90% flash on your inverter say the battery is down 10% or 50%? Until you know that, your interpretation of the data may be raising a concern for an issue that doesn't affect your refrigerator.
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2006 3000RK
2009 Ram 2500
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