question

andreasfi2 avatar image
andreasfi2 asked

IP22 and MPPT 75/15 Stop Charging Due to Low Temp

Hi Community!

I have the following setup in my RV:

  • IP22 Charger with 20A
  • MPPT 75/15 with two 110Wp Panels attached
  • BMV 712
  • Liontron 150Ah Battery

The car is currently parked in a large garage and 230V power cable is attached. Two days ago I tokk the car out of the garage and I saw that the BMV 712 reports that only 48% of the battery capacity ist left. As the 230V cable was detached at that time I looked at the status of the MPPT. It was sunny outside an I expected it to charge the battery, but it wasn't. It showed that the battery temp was at -18°C which was definitely wrong. The temperature was around 24°C.

It was the second time that this happened. The first time I saw this -18°C in the IP22 status when it was about 30°C.

After some time the -18°C information disappeard and the MPPT was charging the battery again.

There is no temperature sensor installed on the BMV's shunt.

Any ideas?

Kind regards

Andreas


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MPPT ControllersBMV Battery Monitorbluesmart ip22
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1 Answer
klim8skeptic avatar image
klim8skeptic answered ·

Might be an idea to set the aux2 input on the bmv to none.

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