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demderder avatar image
demderder asked

Can I use Node-Red to change MPPT charging current based on a temp sensor?

I just installed Venus Large and I've done some small task using relays to control fans or lights. I know the MPPT has temperature scaling so it'll do 100% output at 40c and 0% output at 70c and the scale is linear. I'm wanting to add another layer of protection for peace of mind. My idea is:


150/35 mppt with venus os on rasp pi and a 1 wire temp sensor attached to the cover of MPPT

If temperature greater than 50c then set MPPT output 15a, If temperature less than 40c for 30min then set MPPT output to 35a

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matt1309 avatar image
matt1309 answered ·

Hi @demderder


I believe this is possible. I always use DBUS address page for finding out the corresponding MQTT topics easily:

dbus · victronenergy/venus Wiki · GitHub


So i think the topic you're looking for is:

W/{VRMID}/solarcharger/{DEVICEID}/Settings/ChargeCurrentLimit

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demderder avatar image demderder commented ·
Thanks for the link! It helped a lot
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