Blackout power calculator

Illustrative estimates, not a medical-device power guarantee. Use manufacturer ratings and measured consumption. Fridges have startup surges; CPAP humidifiers can greatly increase demand. Never backfeed an outlet.

Solar estimate includes a 25% charging allowance. Clouds, shading, temperature, battery aging, idle draw, and conversion losses reduce performance. Generator runtime cannot be inferred from tank size alone; use its manufacturer’s fuel-consumption chart. Do not use a vehicle starter battery as an assumed deep-cycle supply.