DC or AC?

What is better, OpenSprinkler in the DC or in the AC variant?

First you have to explain where the differences are. DC stands for "Direct Current" and means direct voltage while AC stands for "Alternate Current" and alternating voltage.

A distinction is made here between two different power supplies. But which one is “better”?

This question is not so easy to answer. The 24VAC technology is quite old, but particularly robust. But you also need a power supply unit, which takes up a lot of space. And then there is the problem of "humming", i.e. the transformer makes humming noises. The big advantage, however, is that all irrigation technology from the major manufacturers works with 24VAC. As a result, an existing computer with 24VAC control, which, for example, does not yet have a WLAN or Internet connection, can easily be connected to the OpenSprinkler Replace AC.

The DC technology, on the other hand, is very new. We deliver with that OpenSprinkler DC always use a 7,5VDC power supply, as this is difficult to find on the open market. In fact, you can OpenSprinkler Operate DC from 5VDC to 12VDC - internally, the necessary voltage to open the valves is generated with a booster. With 7,5V we even have the optimal ratio between internal and external resistance, so that the power consumption in this variant is particularly low. So the DC version is actually the better one when you set up a new system.

Would you like to go with me? OpenSprinkler you need a relay to control additional components such as lights or pumps. But watch out while waiting for OpenSprinkler AC can take normal 24VAC relays, for DC one must use 3-32VDC SOLID STATE RELAYS. If you use a 12VDC power supply on the OpenSprinkler DC, so you can also use normal 12VDC relays. It is important that the 12VDC + from the power supply is connected directly to the relay +, the relay - is then connected to the desired port 1-8 on the OS DC - i.e. relays do not connect to COM, but always connect solenoid valves to COM. This bypasses the booster.

SSRs do not have any mechanics like traditional relays, so they are more reliable and durable.

Another interesting feature of the DC variant is that the solenoid valves no longer "hum" but only "click" when switching on and off.

Both variants can easily switch all types of 24VAC solenoid valves. Yes, you read it right! The 24VAC solenoid valves also work with the DC!

Both at OpenSprinkler AC as with DC, you can order the “standard power supply” when ordering. The AC is the 24VAC 1A, the DC is the 7,5VDC 2,93A plug-in power supply. Both are included for a surcharge of EUR 10. Individually, these cost almost twice as much.

Conclusion: To replace an existing computer OpenSprinkler Use AC for new installations OpenSprinkler DC.