Wireless Sprinkler Solenoids: How DC Latching Solenoids Work

A wireless sprinkler solenoid is the part that lets you open and close an irrigation valve without running a signal wire back to the controller. The solenoid itself is the small electric coil on top of the valve. Making it “wireless” means sending it the open and close command over the air instead of down a buried wire, which is exactly what the Thrive EVO wireless valve system does with the valves you already have.

If you have been searching for a wireless sprinkler solenoid, you are usually trying to solve one of two problems: a valve you cannot reach with wire anymore, or a new valve you want to run without trenching a fresh wire path to it. This guide explains what the solenoid actually does, the difference between a standard AC solenoid and a DC latching solenoid, and how you get wireless control of either one without replacing your controller.

What a sprinkler solenoid actually does

Every automatic irrigation valve has a solenoid bolted to the top of it. The solenoid is an electromagnet with a small plunger inside. When the controller sends it power, the plunger lifts, a tiny amount of water bleeds through a port, and the pressure difference pops the valve open so your zone runs. Cut the power and the plunger drops, the port closes, and the valve shuts.

That is the whole job. The controller is the brain that decides when to water, but the solenoid is the muscle that physically opens the valve. If the wire between the two ever breaks, corrodes, or gets cut by a shovel, the controller can still send the command but the solenoid never hears it. The zone goes dead. On a large property, chasing a single broken wire under a parking lot or a new road can cost more than the whole zone is worth.

AC solenoids vs DC latching solenoids

There are two common types, and the difference matters when you start thinking about wireless.

• Standard 24 volt AC solenoids. This is what the large majority of in-ground systems use. The solenoid needs continuous 24 volt alternating current the entire time the valve is open. The moment the power stops, the valve closes. Simple and reliable, but it means a live wire has to run from the controller to every valve.
• DC latching solenoids. These are built around a small permanent magnet. Instead of holding the valve open with constant power, they take a short pulse of direct current to flip open and a second reversed pulse to flip closed. Once latched, they hold their position with no ongoing power at all. That low power draw is why DC latching solenoids are the standard choice for battery powered timers and for two wire systems where you cannot deliver constant voltage down a long run.

The takeaway is not that one type is better. It is that a DC latching solenoid only needs a brief signal to change state, which makes it a natural fit for wireless and battery powered control. A standard AC valve, on the other hand, expects a controller and a wire. The good news is that you do not have to rip out either one to go wireless.

How you make a solenoid wireless without new wire

This is the exact problem the Thrive EVO was built to solve. The EVO is a wireless valve system, not a controller and not a timer. It sits between the controller you already own and the valve you already have, and it carries the open and close command across the air so no new signal wire is needed.

Here is how the pieces fit together:

• The transmitter connects to a station output on your existing multi wire controller. When the controller calls for that zone, the transmitter picks up the signal.
• The receiver sits out at the valve and wires directly to the solenoid. When it hears the transmitter, it drives the solenoid open, and when the controller ends the cycle, it closes it again.

Because the command travels wirelessly, you keep the controller, keep the valve, and keep the solenoid. You are only replacing the buried wire between them with a reliable radio link. The EVO works with any standard multi wire irrigation controller and standard irrigation valves, and it is compatible with two wire systems and pump start relays as well, so it fits the odd cases as easily as the common ones.

Range, stations, and what to expect

A wireless link is only useful if it actually reaches. The EVO holds a reliable range of about 700 yards line of sight, or roughly 200 yards through buildings, walls, and other obstacles. Each Thrive device manages up to 4 stations, so a single receiver can bring a small cluster of valves back online rather than one at a time.

That coverage is what makes the retrofit cases work. A valve stranded across a new parking lot, a zone cut off when a road went in, or a bank of valves at the far corner of a commercial site can all be reconnected to the controller running them today, instead of adding a second clock or boring a new wire path.

When wireless beats running new wire

Running fresh wire is not always hard, but on the jobs where it is hard, it is very hard. Wireless makes the most sense when:

• The valve is across a barrier. A driveway, a road, a sidewalk, or a new building sits between your controller and the valve, and trenching or boring across it is expensive or not allowed.
• You are repairing a failure, not building new. A wire fault somewhere under the turf has killed a zone, and finding the exact break would mean digging up a lot of healthy ground.
• You are adding to a system that is already finished. The landscape is in, the hardscape is poured, and you do not want to tear any of it up to add a station.

In each of these, the solenoid and valve are fine. The wire is the problem, and wireless removes the wire from the equation. For a full walk through of the retrofit process, see our guide on how to make an existing sprinkler system wireless without trenching.

How this differs from a smart controller

It is easy to mix these up, so it is worth being clear. A smart controller decides the schedule and, in newer systems, connects to an app. A wireless valve system like the EVO does not set the schedule at all. It simply carries the signal your existing controller already produces out to the valve without a wire.

If your goal is app control and cloud scheduling on top of wireless valves, that is a separate layer. The Thrive AirLink Cloud Controller handles that side, running your stations from the Thrive mobile app over the Amazon Sidewalk network, which covers about 95 percent of the populated United States, with a low cost gateway for the spots that fall in the gap. You can compare the wireless controller approach against WiFi controllers on our wireless irrigation controller with no WiFi page. For most solenoid problems, though, the EVO on its own is all you need.

Frequently asked questions

Can you make a sprinkler solenoid wireless? Yes. A wireless valve system like the Thrive EVO carries the open and close command from your existing controller out to the valve over the air, so the solenoid operates without a signal wire running back to the controller. You keep the valve and solenoid you already have.

What is the difference between an AC and a DC latching solenoid? A standard 24 volt AC solenoid needs continuous power the entire time the valve is open. A DC latching solenoid uses a short pulse to open and another to close, then holds its position with no ongoing power, which is why it is common in battery powered and two wire systems.

Does the Thrive EVO replace my solenoid? No. The EVO does not replace the solenoid or the valve. Its receiver wires to the solenoid you already have and drives it wirelessly, so you are only replacing the buried signal wire with a radio link.

How far will the wireless signal reach? The EVO holds a reliable range of about 700 yards line of sight, or around 200 yards through obstacles such as walls and buildings. Each Thrive device manages up to 4 stations.

Will it work with my existing controller? Yes. The EVO works with any standard multi wire irrigation controller and standard valves, and it is compatible with two wire systems and pump start relays. You keep the controller you already own.

The simplest way to control a valve you cannot reach

A wireless sprinkler solenoid is not about buying a special new solenoid. It is about getting the signal to the one you already have without a wire in the way. The EVO does that with your existing controller and valves, which is why it fits both the everyday zone and the stranded valve across the parking lot. When you are ready, you can find Thrive through irrigation distributors on our where to buy page.