Multiplus ll internal temp

DIY
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1

Greetings,

I found a good solution in the archives provided by “Robert.” He demonstrated placing a Victron temp sensor on the MPll (24v 3K) transformer top left lug in the center of the winding with the attached excellent photos. This will solve my problem, however, before I get into the inverter, i would like to know if that lug is energized and if so is direct from the DC feed line, in this case 24V? If there is a newer way or method through the VRM to measure the MPll temp I would appreciate some guidance. I’m running the latest Beta version 3.5 - 20.

I have the MPll VS activating two USB powered computer fans upon the MPll reaching pre-alarm for over-temp.

Thank you in advance

robert1
robert11920×2560 443 KB

Robert2
Robert21920×1440 230 KB

2

The lug itself does not carry current.

It outputs a small voltage based on the temperature it reads (like in the 0 to 5v range). It is signal only.

3

While I haven’t played around with it myself I do believe there is a way to get internal temperature data of Victron products via node red or signal K. The guys who have worked with it more might be able to tell you more.