Setting SoC cut-off for inverter
clarksandquist Registered Users Posts: 2 ✭
Have a Victron Multiplus 3000 connected to 2 Lithium Ion batteries (Tesla Model S modules) and I want to avoid always charging back up to 100% when I am not regularly using my RV. I understand that keeping the batteries at a lower SoC (like 50%) is better for battery life and then only charging up to 100% shortly before a trip. Is there a way I can set the Inverter to quit charging the batteries at 50% sometimes and then change back to fully charging them when needed? (PS- If you can't tell, I am new to all this).
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Install a manual disconnect, so you know the battery bank won't be drawn down.
- Assorted other systems, pieces and to many panels in the closet to not do more projects.
I assume you are running 22.8V nominal voltage modules made of total cell count of 444 Panasonic NCR18650B cells running in a configuration of parallel groups of 74 cells, with 6 groups in series, either one module for 24v inverter or two modules in series for 48v inverter.
To charge a bit over 50% SOC you would charge with absorb voltage setting of 23.4 vdc per module. This is about 3.9 v per cell.
Greatest stress on these batteries is electrolyte degradation which is greater at higher voltages. Cells must not be allowed to go over 4.3v per cell as this is the point where accelerated electrolyte degradation gets really damaging.