Gasoline generators can develop energy for an infinite period of time provided that you have gasoline or propane available to refill them. For photo voltaic generators, the rate of electricity technology depends upon the size on the hooked up solar array. This electric furnace sizing calculator gives you accurate specifics https://what-size-generator-do-i53186.blogofoto.com/58060374/what-size-generator-do-i-need-for-2000-square-feet-for-dummies