Path-Q Solar
What happens to backup duration if the battery must power a refrigerator continuously during an outage?
Answer
A refrigerator adds a recurring energy load and a startup surge, so backup duration becomes shorter than it would be for lights and electronics alone. The actual reduction depends on the refrigerator's duty cycle, ambient temperature, efficiency, battery capacity, inverter losses, and whether other loads operate at the same time.
Key points
- Use measured energy consumption where possible rather than multiplying nameplate watts by all outage hours.
- Account for compressor startup and possible simultaneous startup with other motor loads.
- Keep the refrigerator closed to reduce runtime during the outage.
- Include freezer contents, temperature requirements, and any medical or food-safety consequences.
- Model the refrigerator together with the other critical loads and reserve.
What it depends on
- Refrigerator energy use and compressor startup
- Ambient temperature and door-opening frequency
- Battery usable capacity and inverter efficiency
- Other concurrent loads and outage duration
Risks and trade-offs
- A refrigerator can run intermittently but still consume energy throughout the outage.
- A battery may have enough energy but insufficient surge power to start the compressor.
- Prioritizing refrigeration may require shedding less critical loads.
Information you may need
- Refrigerator model or measured consumption
- Battery usable capacity and surge rating
- Critical-load list and target outage duration
- Required temperature or food-storage duration
Your next step
What to do next
Have the installer model the refrigerator's measured or manufacturer-rated energy and startup demand alongside the other backup loads.
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