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marc-fritschi avatar image
marc-fritschi asked

Additional relays with Cerbo GX

I want to add more relays to the Cerbo GX to control external devices. Which solution could work for me (and the Cerbo GX / Node-RED flow)?

cerbo gxNode-REDRelay
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Alexandra avatar image Alexandra ♦ commented ·
Are you switching AC or DC loads?

Easy ones for AC are Shelley relays. You can use sonoff ones as well.

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iammotorhomeless avatar image
iammotorhomeless answered ·

@Marc Fritschi some Shelley's are easier than others

I have the Shelley Pro 4PM, I use it more for monitoring
the electric fire is on switch 0
the tumble dryer on switch 1
my cascading MP 48/1600 invertor on switch 2
the lower socket (garage heater) on switch 3

and the flow looks like this

shellypro4pm-flow-01.jpgand my Gui looks like this
shellypro4pm-gui-01.jpg

the best part is that I can automatically switch the Fire, switch 0, off and on again, to stop mother turning it up after the sun has gone down :)
the lower socket (garage heater) on switch 3 goes on and off based on air temp from a RuuviTag next to my batteries

and that looks like this

shellypro4pm-flow-02.jpg


I believe some of the Shelleys can also switch DC loads... but I have never done that.

hope this helps you



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marc-fritschi avatar image marc-fritschi commented ·
This is just a very complete and helpful answer. Thank you!!
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iammotorhomeless avatar image iammotorhomeless marc-fritschi commented ·

@Marc Fritschi
how familiar are you with node red ?
if you need more, once you have your Shelley installed and ready to go
give me a shout, I am happy to help

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highlow avatar image
highlow answered ·

any tuya devices used locally

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