Red, white and solar: 160,000 military buildings to get rooftop arrays
When my grid power fails, I switch my fridge to battery backup and can run all incidental things like some lights, computers and internet. The rest of my power needs like pumping well water are too much for my small system. In winter I use wood heat which requires no grid power.
But my solar and battery system is a toy. If I wanted cost effective backup power I would simply buy a small generator.