Hi all
I have got a bit of a problem at the moment - perhaps an expert out there can help me with this issue.
Setup: Smart MPPT-150/30, Multiplus (MP)II - 5KVA, Cerbo GX, DIY Lifpo4 battery pack - 12KWh.
Problem: The SOC on VRM is not showing what it is suppose to be. After grid charging of battery to SOC of 95%. The input AC was then disconnected. The SOC has remained at 95% since.
VRM has been showing SOC 95% irrespective of actual battery voltage. This is then stopping charging of batter from MPPT and also from grid via MPII.
No problem whatsoever running this setup at all - Except until yesterday (09/04/2022 to present time)
Tried:
1) Disconncted and reconnected all - MPII & Battery Pack, MPPT and Cerbo GX - NO change.
2) Rebooting Cerbo GX via Remote Console - NO change.
3) Rebooted MPII and grid connection - NO change,
4) Increase Bulk and Float voltage to that higher than Battery Management System (BMS) - battery charged for a small increment due to the increase in MPPT Bulk & Float voltage - other than that NO change.
5) Applied continuous AC load - Battery voltage reduced due to load but SOC on VRM still showing 95%.
6) Applied AC load to drain battery and for BMS to restart - battery voltage dropped, BMS restarted but SOC still at 95%. As you can see on the screen shots Battery Voltage and SOC is in the same parameter box or window.
7) Checked for latest firmware - currently running latest firmware.
8) Changing Battery Monitor in Remote Console to Automatic and MultiplusII - NO Change.
Any assistance is much appreciated.
Many thanks!
Trung.
Screen shot 1 - SOC at 96% with No AC load. This then prevents the MPPT from charging the batteries (at 52.28V - SOC should about 50% - BMS showing 50.3% - connected directly to lifepo4 battery). At 50.3% - MPPT should kick in with the lower battery voltage and actual SOC.
Screen short 2 - SOC at 96% with AC load - SOC should reduce with AC load but it just stays static. MPPT kick in due to AC load / draw (but it should be charging anyway due to low SOC/Voltage).
