Only a few years ago, if you needed professional level reliability in an irrigation controller, then it was necessary to invest in a mains powered controller. Battery controllers were generally seen as being less reliable, only able to handle single watering zones.
The latest generation of battery valves from Israeli manufacturer Galcon changes all this. Based on the agricultural controller technology, the new range of controllers are fully waterproof, can handle up to 4 watering zones and have a single battery that lasts and entire year. In addition a rain sensor can be wired into the unit.
The Galcon is available either pre-wired with a single latching solenoid valve, or with up to 4 separate valves.