along with low battery voltage alarm. floor S.O.C. is set to 25%, BatteryLife active S.O.C is currently at 35%, but of course it would never get below 55% as long as suspend mode is triggered at this relatively high SOC level.
After some lookup and investigation, I found the relevant settings that needed to be modified - ESS cut-off voltage and ESS Dynamic cut off curve values. After lowering the Sustain threshold voltage from 25.5v to 24.8v, and the Dynamic cut off at 0.005C from 26.0v to 25.0v, the false alarm and early suspend did not appear again, but I still wonder why the default settings are so relatively high. Is daily charge cycle of more than 50% bad for Lifepo4 batteries? even if the answer was yes, the BatteryLife optimization mechanism shoud take care of that by dynamically setting the active SOC limit. Suspend mode, if I understand correctly, is sort of emergency mean to protect the battery if abnormal scenario happens. Is 26.0v abnormal for 6 cell 24v Lifepo4 battery? lead acid battery? or is there something else that I should be aware of when lowering these thresholds?
I set my 24V system to 22V. A heavy load will drop the voltage and disable discharge. You won’t see low voltages unless you set the min SOC to 0%. If you only want to run them down to 20% it will stop at 20%. But that is only if you are able to estimate the SOC accurately.
That makes sense, I really don’t get why the default values are so high. did you also increase the Restart offset voltage, which defaults 0.6v? I increased it a little, to 0.8v, even though I had no cycling problem before. It took me a while to even notice that something was wrong, because during winter time, 55% was about the same or even lower than the active floor SOC setting. I recall seeing Low battery LED blinking sometimes, but there were no actual alarms in VRM.
It might be something you can try and tune, the restart voltage. I dont really have a problem once it hits 0% and disconnects it is usually just before the sun comes up. I have my charge and discharge set so the battery has enough stored to last all night.