Measuring and Switching on Extraction fan based on temperature using the relay and a GX

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rikesh asked Oct 29, '20

Measuring and Switching on Extraction fan based on temperature using the relay and a GX

Hi, I'm also trying to see if I need use a Thermostatic bimetal tempertaure sensor https://www.tro-pacific.com/collections/controller/products/thermostat-no-10-50-deg-c-61-x-34-x-35-mm

to measure the temperature inside an electrical box and connect this to CERBO GX Temp inputs to trigger a relay switch and turn on an extraction fan.https://www.tro-pacific.com/products/filter-fan-58m3-h-230v-50-60hz

Question:

1. Is this possible to connect this Thermostatic bimetal temp sensor to CERBOGX?

2. Do I need to use Thermostatic bimetal temp sensor or could use victron sensor somehow for this purpose? https://www.victronenergy.com/live/temperature_sensors

cerbo gx Temperature Sensor

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Modifications Space

Node Red Space

Answer 1 · 2020-10-29T05:03:35Z

Guy Stewart (Victron Community Manager) answered · Oct 29, 2020 at 05:03 AM

Hi @Rikesh

Relay control based on a temperature is not something that is offered via the GX menu at the moment.

BUT there are 'workarounds'...

There is an application explained here using the built in controls to heat a thermal pad for a lithium battery- https://www.youtube.com/watch?v=q0Uu7EXJU4s

You might also want to look into the 'unsupported' Node Red. There is further specific discussion here - https://community.victronenergy.com/questions/9730/how-can-you-control-relays-using-temperature-data.html

Lastly there are 3rd party stand alone products that are dedicated to this kind of job.

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rikesh commented · Oct 29, 2020 at 07:33 AM

thanks mate and MTW I like all your videos

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Guy Stewart (Victron Community Manager) ♦♦ rikesh commented · Oct 29, 2020 at 08:19 AM

I appreciate you watching them, and I get your feedback about more detailed and specific system wiring videos and of course a complete Cerbo GX video (which will be an absolute epic).

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rikesh Guy Stewart (Victron Community Manager) ♦♦ commented · Nov 06, 2020 at 12:34 AM

I'm working on what could become a complex systems wiring and with CERBOGX is our holy grail.

But if this works then we would have tested CERBOGX to its limits.

1. We are using tank input for water level monitoring.

2. Temp sensor via tank input (software changed to relay) to switch on another relay to turn on exhaust fan.

3. Turbine connected via its safety switch and regulator/controller to energy meter (Scott Clark suggestion) to GX.

Wouldn't mind your help on this?

And of course do a complete video (your video expertise would help)?

4. The we have the stock standard schematics for BYD15.4kWk on Quattro 3 phase with both solar and wind turbine as a grid and off grid system.

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rikesh rikesh commented · Nov 06, 2020 at 12:36 AM

5. Use digital inputs to control a motor controller to lift our solar panels and automate this for strong winds to lower it down as well.

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Jesse commented · Feb 05, 2021 at 03:35 AM

This would be a handy feature!

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rikesh Jesse commented · Feb 05, 2021 at 03:38 AM

yes when we test this I will post a video

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kclendaniel commented · Jul 22, 2021 at 02:00 AM

I just set up a fan controlled by the tank pump and I am curious how to configure the percentages to trigger the off/on with cooling vs the heating of the thermal pad example. Does the Cerbo automatically detect when the % for on is higher than off and flip the logic? By default it appears that if the tank drops to a certain level then it turns on to bring to a higher level but for this 'cooling' application the 'on' threshold would be higher than the 'off'. In theory this would work where the % is anywhere between the two values but I cannot seem to get the relay to trigger unless it is above the 'on' % meaning this setup for an exhaust fan will not work.

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Answer 2 · 2021-02-05T04:36:32Z

Kevin Windrem answered · Feb 05, 2021 at 04:36 AM

I'm not sure you'd need to go through Cerbo at all. Just connect the temperature sensor's contacts in series with the fan's power input.

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