I've read through a bunch of SoC issues by numerous people and have not seen the answer to my problem. I will try to be thorough and include my design and diagnostics I've done already.
- I have a 105AH x 4 lithium battery bank in a 12v parallel configuration totaling 420AH
- I'm using a Victron 12/3000/120 Hybrid Inverter
- I have a BMV712 with all things on the load side of the shunt(bus bar off the load side) and a single connection to the battery negative from the battery side. I have the B1 wire connection to the battery positive. I have triple verified everything is wired on the correct side
- Loads are reading properly depending on what I turn on.
This is where it gets strange. I have a 420AH bank. If I put a 100A load on the system, it will say I have only 40 minutes left and drain to 0 in such time. I should be getting around 4 hours based on the load. I did a 200A test yesterday and drained my battery bank to -381 consumed AH. However, my SoC went to 0 after only -71 Ah.
Ultimately, my BMV is reading loads in real time correctly and total consumed correctly, but the SoC is way off. It's like it doesn't understand I put 420Ah in the battery capacity setting. I put a picture of my current battery settings. I have tried synchronizing SOC to 100% multiple times at full battery charge and continues to think I have a small battery bank it seems.
Screenshot of BMV settings below. My absorb and float settings on the inverter/charger are 13.9.
thanks for any help,