12/15/2023 0 Comments Simplenote vs letterspaceThere are very few consumer solar controller options and what I could find is expensive $100 or more for a single valve. Unfortunately irrigation valves require power, which in practice means a wire. We found one run goes maybe 800 feet through four splices. I believe these systems are grounded through literal ground. Mine has 5 strands 4 wires for signal, one common neutral. Irrigation wire tends to be fairly hardy plastic but not metal armored. Guess why I’m reading about this? (Although in my case I think it’s a gopher, not a shovel.) PVC conduit is about $50-$100 for 100 feet, so next time I run a wire I might splurge for some protection. Hopefully they’re buried deep enough that they aren’t broken but in practice they get broken frequently. You know, right under all the shovels and other tools. The wires are usually direct buried in your lawn. Also the 24VAC solenoids are standard any ordinary irrigation controller can control any brand’s solenoids and valves. The nice thing is if the power is cut the valve automatically closes, there’s no need to energize it to get it to close. That’s a lot of power! But I’m not sure how many watts it really ends up being I’m finding things that suggest it’s about 2W, not the 12W I’d naively assumed. When the computer turns the water on it supplies continuous power at about 0.5 amps. The solenoids are controlled via a 24V AC wired signal coming from an irrigation computer. It’s moving a small part that controls a small water flow it’s not turning a big valve or somehow manipulating full water pressure. The key thing here is that the solenoid isn’t doing a lot of work. I think a spring is involved somewhere to hold the solenoid valve closed. That lowers the pressure on the diaphragm, allowing the main water flow to go down the pipe. When the solenoid gets electricity it raises that stopper so a small amount of water is released. There’s a solenoid as part of the system that ordinarily is in a closed position so water can’t flow out a dump port. The valve is a diaphragm ordinarily held in place by finely balanced water pressure. (What a brand name!) Some notes on how it works. I’ve got a bunch of automatic irrigation in my lawn, all Irritrol equipment. But WSL seems to install show-motd by default and so you get a MOTD once a day. WSL doesn’t run login or PAM for shells so some of this stuff doesn’t happen in the WSL context. (It does not check if it’s a login shell.)
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