Understanding your RV refrigerator's power use is key to managing battery life, especially when camping off-grid. Here's a breakdown:  

RV Refrigerator Power Consumption  

Most RV refrigerators are absorption-style (common in older models) or compressor-style (modern, energy-efficient units). Their wattage varies:  

- Absorption Fridge (Electric Mode): Draws 300–400 watts when heating elements are active, but cycles on/off, averaging 100–200 watts per hour.  

- Compressor Fridge: Runs more efficiently, using 60–120 watts while running and cycling less frequently.  

Battery Life Calculation  

A 12V 100Ah battery holds 1,200 watt-hours of energy (12V × 100Ah). However, lead-acid batteries should not be discharged beyond 50% to avoid damage, leaving 600 usable watt-hours. Lithium batteries can safely discharge 80–90%, offering 960–1,080 watt-hours.  

 Example:  

- A compressor fridge drawing 100 watts while running (and operating 40% of the time due to cycling) consumes ~40 watts per hour.  

- Lead-Acid Battery: 600Wh ÷ 40W = 15 hours.  

- Lithium Battery: 960Wh ÷ 40W = 24 hours.  

  Real-World Factors  

- Ambient Temperature: Heat increases fridge runtime.  

- Door Openings: Frequent access raises power use.  

- Battery Efficiency: Voltage drop and inverter losses (if used) reduce runtime.  

 Maximizing Battery Life  

- Use propane mode for absorption fridges when possible.  

- Upgrade to a lithium battery and compressor fridge for efficiency.  

- Pair with solar panels or a generator for extended off-grid stays.  

Final Tip: A 12V 100Ah battery alone won't power a fridge long-term. Plan for supplemental charging to keep your food cold and your adventures uninterrupted!