....................................... Similar to synchronizing a coulomb counter, but not limited to 100% SOC.......................................
Exactly. That's an excellent description of what it does. It's both automatic and also can be initialized manually using Reset Capacity in the app.
For anyone struggling with inaccurate results, make sure to go through all the setup steps.
Setting up a JBD BMS is neccesary.
- Check accuracy of Temperature, Current & Voltage and adjust if needed. (calibration)
- Determine the 100%, 80%, 60%, 40% & 20% voltage set points. I chose to use resting voltages. Voltage is stable after 24hrs rest. Enter & save those stable voltage set points.
- Choose Lite or Normal LiFePO4 as basic parameter settings depending on how you want to use the battery. Then further adjust those parameter settings to meet your requirements.
If you set it up correctly you will get accurate enough results. Skip the set up and get less than accurate results.
Understand that SOC is a combination of coulomb counting and voltage set points. Accurate 80%, 60%, 40% & 20% voltage set points are critical.
Newer JBD BMS's may have entries for 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20% & 10% as you can enter those in the most current JBD Tools Windows PC program.
The BMS can learn capacity but the JBD BMS manual warns of up to 25% deviation if relying on that. Each automatic adjustement is 10% according to the manual. It's quicker and more accurate to do it manually IMO.
Resellers like Overkill might do a basic setup that's good enough for most but it's worth checking all the critical settings and adjusting/correcting as needed for your requirements.