OpenSprinkler Forums Hardware Questions OpenSprinkler Pi (OSPi) OSPi with RPi model A Re: Re: OSPi with RPi model A



The backup battery is used for the real-time clock (RTC). It does time keeping even when the controller is off or the Internet connection is down.

Typical 24V AC sprinkler solenoids need power to stay on. When power is down, they will turn off and hence no water will flow through the valves.