THE POWER LAB
Estimate backup hours from watt-hours and a continuous device load.
THE POWER LAB / RUNTIME ESTIMATOR
1,024 Wh × 85% ÷ 60 W
No solar input or recharging assumed. Not a runtime guarantee. Actual use depends on temperature, battery condition, inverter idle draw, and variable loads.
Check continuous and surge output separately. This estimate does not confirm that a battery can start your appliance. Use manufacturer guidance and a dedicated contingency plan for medical equipment. Fuel generators must remain outdoors, more than 6.1 m / 20 ft from building openings.
Estimated hours = battery capacity in watt-hours × usable energy allowance ÷ continuous load in watts. A 1,024 Wh battery at 85% allowance and a continuous 60 W load gives about 14.5 hours. The loss allowance is a planning assumption, not a measured efficiency rating.
Refrigerators cycle on and off. Their average consumption is different from the power drawn while the compressor runs, and startup surge can exceed the running load. Measure energy use or consult the exact appliance documentation, then check the battery’s continuous and surge output separately. This calculator does not establish electrical compatibility.
Add every load you expect to run together. Temperature, inverter idle draw, battery age and charging conditions can affect usable energy. No solar charging is assumed. Equipment needed for health or safety requires a dedicated contingency plan with the relevant professional or supplier.
Understand backup power · Research power equipment · Power outage guide
PRACTICAL GEAR / READY WHEN YOU NEED IT
Find the right tool for the next gap in your kit. Compare the essentials below, then check current prices and options on Amazon.
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