Critical Loads
Critical loads are the essential home circuits and appliances a battery should support during an outage.
What critical loads means
Critical loads are the appliances and circuits a homeowner wants to keep running during an outage. They usually include essentials such as refrigeration, selected lights, internet equipment, medical devices, a well pump, or limited heating and cooling support.
Critical-load planning is the safest starting point for battery sizing because it avoids assuming a battery must run the entire home. Use the Battery Sizer with the Critical Loads Battery Guide before comparing battery quotes.
How to list critical loads
- Write down each essential appliance or circuit.
- Estimate watts and expected runtime for each load.
- Separate true essentials from comfort loads that can wait until grid power returns.
Why it matters
A clear critical-loads list prevents overspending on battery capacity and helps homeowners compare backup proposals more accurately.
Example
A critical-loads list might include a refrigerator, modem/router, several LED lights, phone charging, and a well pump, while excluding an electric oven or whole-home air conditioning.