Path-Q Solar
How long could a battery keep essential home appliances running during an outage?
Answer
A rough estimate is usable battery energy divided by the average load, adjusted for inverter losses and any reserve. Runtime can range from hours to much longer depending on which appliances run and how continuously they operate.
Key points
- Usable capacity, rather than the nameplate capacity, is the relevant starting point.
- Continuous loads such as refrigeration, networking, and heating controls accumulate energy use over time.
- Motors and compressors can require high starting power even when their average energy use is modest.
What it depends on
- Usable battery capacity and reserve setting
- Average and peak load of the backed-up circuits
- Inverter efficiency and operating limits
- Solar recharge during the outage
Risks and trade-offs
- Runtime estimates based only on appliance wattage may overlook cycling and startup demand.
- Adding high-power heating, cooking, or pumping loads can reduce runtime sharply.
- Actual runtime will vary with temperature, battery condition, and user behavior.
Information you may need
- Battery usable kWh and continuous and surge power ratings
- Appliance wattage, duty cycle, and starting requirements
- Which circuits are backed up
- Whether solar recharge is available
Your next step
What to do next
List essential loads and estimate their daily outage energy use before selecting battery capacity.
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