AC valves operated by DC OS

[Shay]

Hello,
I bought OS 3.0 DC version for replacing 24AC controller, The reason for selecting DC and not AC is for future usage of DC outputs.
While searching for information regarding required power supply, I have found this page – https://rayshobby.net/wordpress/understanding-24vac-sprinkler-valves.
It is written there that usage of DC for controlling AC valves will “potentially shortens its life”.
Is that correct ? should I expect shorter life for these AC valves ?

Additional question is related to required DC power supply. I saw a requirement for 7.5-12V with min output current of 1A.
Will it be better to use lower voltage (7.5V) to reduce current drawn by coil and thus increase life cycle ?

Last question is regarding DC plug to be used – is there a need for a plug of 2.5mm or 2.1mm ?

Thanks

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[Ray]

Yes, that’s why the DC-powered OpenSprinkler is shipped with a 7.5VDC 2A power adapter (it’s included by default for US/Cadana orders, but not included for other countries). It provides a holding current that’s the closest to a typical sprinkler solenoid.

I think 12VDC is still pretty safe: I’ve seen discussions online where users have been using 12VDC to drive their sprinkler solenoids for years without any problem.

We had a batch of DC-powered controller that used 2.5mm plug (more specifically, the plug is 5.5mm OD x 2.5mm ID). The current batch should all be 2.1mm, which is more common. The power adapters that we ship can accommodate both 2.5mm and 2.1mm.

[Author]

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