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Trying to use a Shelly Plus 1PM to monitor my pool's SWG, but the switch function isn't working (lemmy.world)

submitted 1 year ago by FapFlop@lemmy.world to c/homeassistant@lemmy.world

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Right now if the pool timer is switched off, the SWG stays on. Likewise, if I switch the Shelly off and switch the timer on, the SWG stays off (and the pump turns on). Checking the SW terminal with a voltage sensor, it is hot when the pool timer is switched on, and dead when switched off. The workaround right now is the setting the schedule feature to closely match what the timer is doing.

Any ideas?

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[–] Godnroc@lemmy.world 3 points 1 year ago (1 children)

I'll start by apologizing for not knowing anything about anything in this arrangement, but I did read a little up on that Shelly relay.

If I understand right, you are just using the Saltwater Generator (SWG) while the timer is active? The timer triggers the relay through the switch input (SW) and that causes power to turn on the output terminal (O). I assume you are using the Shelly with the input in switch mode so that it is on when the timer is on and off when the timer is off.

The issue you are having is that the SWG is still on even after the timer has turned off? It almost sounds like perhaps the settings are not in switch mode and are instead in button mode. My understanding is that it would cause the SWG to turn off-on or on-off for every full off-on-off cycle of the timer.

Hope that helps a little!

[–] FapFlop@lemmy.world 1 points 1 year ago* (last edited 1 year ago) (1 children)

Switch mode is set to ‘Follow’. I do see now that the page is showing the input as ‘OFF’ where previously it wasn’t changing from ‘ON.’ Perhaps some leaking current or a massive delay.

More testing tomorrow!

Edit: Current leak confirmed. :( Randomly went back to ON and switched it on. But at least I know it’s not a Shelly issue?

[–] Faceman2K23@discuss.tchncs.de 1 points 1 year ago

Lots of reports out there of people having current leak issues when doing anything more than the usual light switch configuration. Personally, I'd just put a dumb power meter on it and leave the chlorinator hooked up to the pump line.

[–] Faceman2K23@discuss.tchncs.de 2 points 1 year ago

is the switch input treating the input as a momentary switch rather than a traditional rocker? I think they support both modes.

[–] ipha@lemmy.world 1 points 1 year ago (2 children)

What's your end goal? To be able to control the SWG with either the timer or shelly, or just monitor power?

If you just want to monitor power, leave shelly on all the time and don't use the switch input at all.

[–] FapFlop@lemmy.world 2 points 1 year ago (1 children)

The SWG needs to be off if water isn’t flowing through it (pump off), per the manufacturer. :/

I considered deleting the timer entirely, but I don’t think the 1PM could handle the load.

[–] nukeworker10@lemmy.world 2 points 1 year ago* (last edited 1 year ago) (1 children)

Isn't there a flow switch? Mine has a Flow Switch as a safety feature that came with the cell. While I understand what you are trying to do, it is not safe for you or the equipment. If the cell has been on any significant amount of time with no flow, you have likely damaged it. See this Article

[–] FapFlop@lemmy.world 2 points 1 year ago

Appreciate the concern, but my safety or the equipment’s safety isn’t at risk here. The cell I have (Pentair IC40) has an integrated flow and salt sensor. If either are low, the system is off. The low power draw of the system is specifically what I’m after to know to check the cell to see why it’s not generating.

I just installed the Shelly this afternoon, which is why I’m posting after not getting the expected result out of the switch input.

[–] ThorAlex@infosec.pub 1 points 1 year ago

Like he said, no need to use the shelly for switching if you only need power monitoring.

Or you can use a Shelly EM.