I am on a sailboat in the Caribbean. This week I had 4x 200ah Victron lithium batteries installed professionally with a bms, bmv712, battery protect, mppt 100 solar chargers x 3. Everything seems to work well except the temperature on one of them was 52C and the others were in the high 40s. Is this normal?
If this is normal depends.. If there is a lot of active equipment running in a confined space, perhaps heated by the sun? Then it could be normal.
Nevertheless 52 degrees is uncomfortably hot for li-ion batteries. Ideal is somewhere between 20 and 25 C
Is this a problem?
What can I do to change it?
Start there. If it is hot, the batteries will be hot so then rather consider improving ventilation, perhaps with some extraction.
Electrical gear does not perform well at high temps, so if your inverter is also hot you will be losing performance.
Space should be left around all the components so there is reasonable airflow.
If the batteries are all in the same place/compartment and equally cooled, wired to share the load, you may have a faulty temp sensor. Installer should test.
Guessing the plus 6 setting was to trigger load reduction early and keep temps down/help battery life.
