Power outages are not rare everywhere. Where they are rare, a diesel generator that is hardly ever used is likely to not work the time you actually need it. Whe

Power outages are not rare everywhere. Where they are rare, a diesel generator that is hardly ever used is likely to not work the time you actually need it. When the grid is working, powering your A/C from solar is still a good idea, and returning power to the grid when you don't need the AC is often helpful. In terms of emergency power outage in hot day situations, you don't need to cool the whole building, or cool it to a comfortable temperature, it just needs to be below a "wetbulb" of 35°C in a single room people can shelter in until power is restored.