Hi. I’m not certain of what the algorithm used actually does when calibrating SOC% vs pack voltage. But the adjustment seems far too steep - the SOC% changes faster than the voltage would indicate for an LFP pack.
Is there a procedure for this? How often should the ‘target’ be manually adjusted?
Hello, good question as this also confused me for some time until recently. To my current knowledge these two are not directly related. This is what I know:
target voltage/curve is determined by Control-Logic>Remote settings. I always used Ramped, but now changed to Dynamic Ramped (Victron profile). Target voltage is then set in steps of 0.3V until max pack voltage is reached
in Hardware > Shunt settings you enter the capacity of the pack. There you also see the first Recalibrate SOC-reset setting. Once your charge flows over 101,5%, SOC will be reset to 100%
final SOC calibration is done based on minimal Bypass value/session for all cells under Control-Logic > Charging. This means ALL cells need to reach a certain bypass value before SOC is reset to 100%. Actual bypass voltage is found in Hardware>Cellmon. This means, if you have one misbehaving cell (or bad connection), you will never enter the Bypass Complete phase. Monitoring of the bypass value per cell is found under Telemetry>Cell-Info
There are some links that explain it in more detail. Search for Dynamic Voltage and Victron Profile.
I tried used the dynamic ramped voltage setting, but the watchmon won’t save the configuration. Do you know if this setting REQUIRES a Victron controller/inverter?