Backup Power Map
What do you want to keep running?
Choose the appliance or its common US nominal size (HP, ton or BTU). We use published sizing references for a screening estimate, then let the equipment nameplate or manual override that estimate when you have the actual watts.
Your backup sizing estimate
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Options to compare
Base units are screened by published output and battery ratings, across affiliate and non-affiliate brands. Compatibility, startup duration and stock still need checking. No hands-on testing is claimed.
How this estimate was calculated
The estimate includes 25% continuous-power headroom, 10% startup headroom for motor loads, 85% inverter efficiency, 90% usable battery capacity and 20% energy reserve. Appliance consumption varies by model, temperature and operating cycle. Verify voltage, outlet limits and manufacturer startup compatibility before buying. Hardwired, 240 V, medical and life-safety loads require qualified review.