The battery backup power is usually installed just outside of the home. The battery connected to the major power pack, which is connected to a power grid, automatically responds to the outage and restores your home's electricity.
A battery backup power will operate just like any other alternative power source for the home. The backup power provides an emergency source of power supply to the home the moment there is a power outage or failure in the home’s main electrical power source. This sometimes occurs whenever there is an external interruption on the regular home power source. Such possible external sources are a storm, blizzard or even an equipment failure.
Most of the battery backup power packs have a limited battery run time, as the whole idea of having a backup is to provide interrupted power to certain electrical items in the home. The cool thing about a typical battery backup power is that the emergency power supply stays sufficient just long enough for the regular power to come back on. In essence, what this means is that the limited on battery run time is sufficient enough to supply power to the home, pending the return of regular power supply.