I've been using a Multiplus 5000 for a few months. Parallel to the grid, it charges a 20 KWH li ion (NOT Lifepo) battery from 17kwP solar.
Now that the days recently got darker and rainy, I have an increasing low battery problem. The MP5000 goes into sustain mode at 33% / 51.2V.
The voltage of my cells is in the range of 2.7 ... 4.2 V (2 parallel Blocks with each 15 cells, 60V if fully loaded). Everything in the ESS is configured so that discharge should take place until 43V.
So why does the MP5000 stop at 51.2? Which Option did i miss?