I updated the firmware on my Bluetti Elite 100 V2 a couple of days ago, ever since then it’s started to have strange issues, more so with the wattage consumption going up when I switch the lights off running on DC, I switch them on & it reads the normal expected wattage, I have also got issue with my 200W solar panel only drawing in 10W with clear skys, Sunny, the Bluetti is at 97%, it normally draws in more than that at 97%, I’m thinking the firmware update did something wrong, had no issues at all before the update.
Can anyone help please, only had it just under a year.
Actual W data might help answer your Q. re the lights.
That your E100 shows 97% SOC and only 10W input suggests to me that the battery is full. Therefore your calibration might be out of sync. Have you calibrated the battery since your purchase? If not do one.
FYI - If you want to know how… Charge to full from the grid, then deplete the battery until the unit turns off with a constant resistive load at 200 to 500W i.e. a small heater on low setting. The E100 will still have a safety capacity, even though SOC is zero. Then fully recharge the E100 from the grid in Silent mode with AC & DC turned off and no loads.
For battery health and calibration a recal should be done approx every 6 months.
For some strange reason it started working again as it should last night, I used my laptop to deplete the battery to 89% then did a factory reset, seems to be fine now, however I will do what you have said, it’s never been calibrated before, really appreciate your time and reply to my question, thank you.
Your Welcome Mark, glad to assist. If you need any further detail on calibration let me know here, I often check the Forum 2-3 times a day, unless I’m off on a remote trip lol.
I have an AC200P, 3 x AC180s, 2 x AC70s, an Elite 100 and an AC2A all bought at different times. So I do a recal on all of them before Xmas and then again at mid year. Any small discrepency, in that 6 months I live with and they all seem to work work well and not give any issues. I do have a 6.6kW rooftop solar array/5kW inverter, so I do the grid recharge when solar is providing grid power. (Total recharge is over 8kWh)
Great assist @Mandp. The technical reason why SOC drifting occurs is due to the flat voltage curve of Lifepo4 batteries. From 90-100% maybe only ~0.04–0.07V or so per cell. BMS can’t tell the difference between say 93% and 98% that much. At the top end it tends to go through cell balancing and applies a constant voltage to prevent cells from “overcharging”. BMS is not a perfect system. I would say more so an error-correcting one over time. It is most helpful that you do the calibration properly. Three key things. Discharge the battery at a constant rate so the BMS can learn the pattern/behavior easier. It can be a higher wattage appliance so you don’t have to wait days for it to discharge lol. Then WAIT 2-4 hours to allow the cell temp to come to thermal equilibrium BEFORE recharging. Lastly, make sure you also CHARGE the unit at a constant rate. This means avoid solar charging if possible. You can do it over solar if you have no choice, but it has to be a full sunny day where the voltage is constant for a few hours. I have had one unit where I had to repeat this process 1 more time to fully calibrate and another one where calibration failed because the cells were bad.
Well said @sealy1986. I try to not get too tachnical, lol. Which is why I said to use a resistive load and charge from the grid. Both are usually stable loads and charge rates.
Thanks for pointing out that cell drift can require the recalibration process to be performed a second time and on some rare occasions several times. In my opinion, if a recal is done more than 4 or 5 times and the discrepency still exists, there’s likely other problems causing the issue i.e. A deteriorated or faulty BMS or cell, amongst others.
Thanks for the info, I have been discharging it all day hooked up to my Mac and monitor, also recharging camera batteries etc, now I know it’s definitely gonna last a weekend or more lol, thanks for the assist, really appreciated
