Best fit
Best for 10-hour target
BLUETTI AC180
94%SCORE
1,152Wh1,800W500W solar
Closest match to the required capacity with useful compressor headroom.
Runtime calculator
What size battery backup do you need?
Enter the real device load, surge, and target hours. We’ll estimate usable capacity and show products that meet both output and runtime requirements.
Use measured wattage when possible. Nameplate ratings can be higher than typical consumption, while motors may need much more power at startup.
Tool-driven conversion
Recommendations feel earned because they come from the visitor’s own inputs.
Recommendations feel earned because they come from the visitor’s own inputs.
Your result
Recommended minimum capacity
1,120Wh
Choose at least 1,800W continuous output with enough surge headroom for the compressor.
1,800WMinimum output
900W+Surge requirement
Estimated runtime by capacity
Calculation
Required Wh = load × hours ÷ efficiency × reserve
Cycling appliances require a duty-cycle estimate. Medical equipment must be checked against manufacturer-approved power options.
Do not use calculator output as a guarantee for life-sustaining equipment.
Products that fit
Recommended from your result
Only show models that clear both runtime and output requirements.
Fast charge
Best for faster recovery
EcoFlow DELTA 2
89%SCORE
1,024Wh1,800WFast AC
Slightly below target capacity but strong if the fridge cycles lightly.
Long runtime
Best for extended outages
DELTA 2 Max
99%SCORE
2,048Wh2,400WExpandable
Higher cost, but much more reserve for long outages.