[RE-wrenches] Wireless relays

[Kirk Herander]

Hi Jason,

https://www.iohvaccontrols.com/category/wireless-solutions.html

I used the IO-WRP model, with a range of about 1/4 mi. to remotely
disconnect a GTI whenever the backup genny starts. The next model down,
without antenna, has a range of about 100 ft.
The IO-WRP was better suited to my app. I am going from the basement of the
main house where the system / gen ATS is to a barn about 150' away where
the array is mounted.

These units are actually designed for hvac to be controlled remotely by
T-stats or whatever. But basically if any of the 3 send channels have 24vac
applied on the base unit, the corresponding receive channel on the
satellite unit will output 24vac. So that signal in my case is holding a
contactor closed to keep the GTI connected to grid AC unless the generator
starts.

What's nice about these RF units is that if the 24vac power is lost on
either for any reason, connection will be lost and the action at the remote
unit will be aborted. pretty failsafe by nature, at least for what I'm
doing.

I purchased it online from supplyhouse.com - no local distributor stocked
them.

On Mon, Nov 7, 2022 at 9:34 AM Jason Szumlanski via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Recently there was a discussion about remotely controlled contactors to
> shed PV during generator operation I believe. I have a little bit of a
> different need for remote relays. I need to remotely disconnect air
> conditioning 24 volt control circuits using the dry contacts in the Enphase
> smart controller. In other words, I want to shed air conditioning loads
> when the system goes off grid and selectively turn them back on using the
> logic in the smart controller. So what I would need is something that
> detects a disconnection of the dry contacts and then sends a wireless
> signal to disconnect the 24 volt control circuit at the remote location in
> the house.
>
> Normally I would just hardwire this, but it is not an option in this case.
> Does anyone know of an elegant and cost effective way to accomplish this?
>
> Jason Szumlanski
> Florida Solar Design Group
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-- 

*Kirk Herander / **kirkh at vermont.solar <kirkh at vermont.solar>*

*Owner|Principal, VT Solar, LLC*

*Celebrating our 31st Anniversary 1991-2022!!*

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