Now with solar power being more mainstream you can find batteries, inverters and a simple AC chargers (nod to Battery Minders) to make such a system is APC Power doesn't make what you want.
I am looking for a battery backup to use at our cottage to connect a router, modem and thermostat system monitor so that if the power goes out I still can connect to check on the inside temp and see when and if the power goes back on. The issue I am having is that last winter the power went out for several hours. The system monitor messaged me that the power was out immedietly and the battery backup lasted for a few hours but eventually died before the power came back on. Once the power came back on the battery backup did not since it needs to be manually reset after it dies. This kind of defeats the purpose of having it, I do not want to have to drive 2 hours to reset if every time the power goes out and the backup dies. Does anyone know of a battey backup that will automatically power back on once power is restored? Thank you in advance for your suggestions.