DIG’s ECO1™ line of solar (ambient light) powered irrigation controllers is available with an anti-siphon valve, inline valve, or actuator to retrofit brass or plastic manual anti-siphon valves. The controllers’ power is derived via a patented, time-tested internal photovoltaic module and microelectronic energy management system that is fueled by the surrounding ambient light. After being charged, this efficient energy system provides enough power for the timer to function at any time, night or day, and in any weather with no direct sunlight required. This energy system also makes the solar powered controller environmentally friendly, functioning only on clean renewable solar power without the need for a backup battery or AC power. The ECO1 solar powered irrigation controllers are available with programming flexibility, including the latest in water conservation features, to allow better operation of drip or sprinkler systems, day and night, and throughout the year without the use of AC power or batteries.