How to measure RV fridge watt-hours per day
Measure a cycling RV refrigerator before estimating battery runtime or solar charging requirements.
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A refrigerator's running watts and its daily watt-hours answer different questions. Its duty cycle varies with ambient heat, door openings and thermostat settings.
Prefer a 24-hour energy reading
Use an appropriately rated appliance energy meter for supported AC fridges, or a compatible battery-side monitor for a DC system. Record actual Wh across a representative day. Safety comes before measurement: never use a meter or adapter outside its electrical rating.
When a meter is not available
Estimate operating watts × on-hours. For example, 60W for six hours of compressor runtime is 360Wh. The same running wattage at twelve hours becomes 720Wh. That twofold difference shows why using a product listing's watts alone can mislead.
Separate refrigerator energy from system losses
If measuring AC-side draw, consider inverter inefficiency and its separate standby demand. If measuring battery-side consumption, avoid adding those losses again. Mark which part of the system each reading includes.
Run a hot-day and mild-day scenario
A fridge that looks easy to power on a cool day can operate longer in summer. Use both measurements in the calculator, then size reserve for the trip conditions you expect rather than one convenient data point.
Turn your result into an equipment checklist
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