Backup Power Calculators
Size generators, essential loads, portable power stations, UPS systems, whole-home batteries, and compare backup ownership costs.
Generator Size Calculator
Estimate generator capacity from running watts, additional starting surge, simultaneous load, and design margin.
CalculatorEssential Load Calculator
Estimate peak backup power and daily energy required for selected essential household loads.
CalculatorGenerator Fuel Use and Cost Calculator
Estimate fuel consumption and operating cost for a generator over a selected runtime and outage duration.
CalculatorPortable Power Station Runtime Calculator
Estimate usable energy and runtime for a portable power station at a selected continuous load.
CalculatorUPS Runtime Calculator
Estimate backup duration for a UPS from battery energy, load, conversion efficiency, and reserve allowance.
CalculatorWhole-Home Battery Size Calculator
Estimate nominal battery capacity required for a selected outage duration and share of whole-home electricity use.
CalculatorGenerator vs Battery Backup Cost Calculator
Compare simplified multi-year ownership cost for a standby generator and a home battery system.
CalculatorGenerator Fuel Tank Runtime Calculator
Estimate generator runtime from fuel-tank size and fuel-consumption rate at a selected electrical load.
CalculatorSolar Generator and Portable Power Station Size Calculator
Estimate portable power-station battery capacity, inverter rating, solar input, panel quantity, and recharge time for selected daily loads.