@BLUETTI_CARE thank you. I am very experienced with recalibrations. 
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@BLUETTI_CARE I am pleased to say that after the latest recalibration, the AC240 SoC display seems to be a lot more accurate in my initial testing.
Using the same test parameters as before with the 650 watt kettle, each 2 minute 30 second boil has been taking between 2 and 4% instead of 11 to 15%. I believe an average of 3% per boil should be inline with the available capacity, which appears to be only around 1200Wh at best.
Iāve noticed that when I do a full recharge after draining and shut down, only between 1100 and 1200 watts is drawn from the Grid according to the App statistics. I would have expected closer to 1380 watts with the stated 1536Wh capacity, so there appears to be about a 200Wh shortfall.
However, I am extremely excited to see a more accurate SoC after the update, and I hope it will continue to improve with further cycles.
Thank you very much for your continued assistance with this.
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Hi, the charging rate on grid should be 1100-1200W if it is set to Standard. Silent is 800W and Turbo is 2200W. I noticed the AC240 manual seems to have a typo where they list both Silent and Standard modes as having a 800W charge rate.
I have the AC200L with a 2048Wh capacity and standard charging does it at 1200W.
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@aaron33 thank you, but Iām talking about the actual amount of watts put back in to the unit for a full charge, not the charging input rate.
Hi @Erebus, Thank you for sharing the test results. Weāre glad to hear that the SOC is now much more accurate. Iāve also shared this update with our engineers, who are very pleased as well.
Regarding the charging power issue, weād like to confirm the mode youāre using for charging. This behavior is normal, after draining the battery, the internal temperature of the machine rises. To prevent further overheating, the AC240 will limit the charging power.
Generally, we recommend allowing the machine to rest for 3 hours after fully discharging to cool down before resuming charging.
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Hi @aaron33, Thank you for your attention and reminder. In fact, the manual is correct.
The maximum power for Silent Charging Mode is indeed 800W, but it limits the fan speed, which may result in reduced charging power as the machineās temperature increases.
For Standard Charging Mode, the charging power is maintained at 800W without limiting the fan speed. It will stay at 800W until the machine is nearly full, at which point the charging speed will be reduced to prevent overcharging.
@BLUETTI_CARE I think there is a misunderstanding. I was not referring to the input charging watts, but the amount of watts taken from the grid to recharge the unit from 0. With 1536wh less the battery protection amount which is usually 10%, you would expect to see around 1380 watts taken from the grid. However, the stats in the app never show more than 1200 watts at best, which makes me think the usable battery capacity is less than expected.
I never use Turbo charging mode to protect the batteries from heat. The input wattage charging rate is perfectly correct for Standard mode at around 850 watts. That is not the issue. Hopefully this clarifies?
Hi @Erebus, Regarding the discrepancy in the Wh value shown by the app for grid input, we believe it might be due to a statistical error within the app. We plan to upgrade your IOT firmware to improve this issue. Is your current IOT version still v9041.06?
If so, we will send you the latest firmware update. You can also try manually calculating the actual charging time and charging power to verify the data.
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@BLUETTI_CARE Yes, the IOT version is still the same. Can you please send the update? Thank you again.
Hi @Erebus, we have applied to upgrade your IoT. Our IT department will push the new IoT to your machine in 24 hours. Please upgrade it tomorrow.
Please do not load any device when upgrading it.
Please let us know if it works.
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@BLUETTI_CARE thank you. I will install the update once received, but it might be a while before I need to recalibrate again, so I wonāt know if the Wh capacity is reported correctly from a 0 to 100% AC charge, or if in fact there is only 1200Wh available.
Hi @Erebus, Thank you for letting us know.
Please take your time, you can update it when you are convenient.
We are expecting your feedback.
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@BLUETTI_CARE after extensive testing, I can advise that there is NO improvement to the Wh input statistics after installing the IOT update. I calculate that when the AC240 has dropped to 0% SoC and shut down, that only the 10% battery protection allowance should be remaining, meaning 1382Wh of the total 1536 have been used. However, when recharging, there is never more than 1000 to 1200 watts replaced, meaning a discrepancy of around 200 to 400Wh I assume this to mean that perhaps the battery protection allowance is more than 10%, thus significantly reducing usable capacity, or my battery cells donāt actually have a total of 1536Wh, or the app statistics are way off. Iām sorry I wasnāt able to report that the update has fixed the issue for me at least.
Hi @Erebus, Thank you for getting back to us so quickly.
It seems like the SOC (State of Charge) on your AC240 is inaccurate.
We suggest you calibrate it after upgrading, and the issue should be resolved.
We recommend customers recalibrate the battery every 3 months. Additionally, itās a good idea to recalibrate if you notice a fast power drain or after upgrading the BMS firmware.
Please follow the steps below to recalibrate it:
- Please discharge all the power (charge AC & DC appliances with the power station) until the SOC is 0%, turn off the machine, and leave it for 3 hours till it cools down.
- Please charge it again, please do not load any device when charging it, and do not interrupt it while in charge.
You can click this link for reference.
Please let us know if it does help.
If not, please contact us for further service.
@BLUETTI_CARE thatās a funny reply. I have lost count of the recalibrations I have done. But thank you. Iām happy with it as it is, but you asked me to let you know if the update changed anything, and it didnāt.
Hi @Erebus, I am sorry for the inconvenience.
I have forwarded this issue to our R&D team, and they have decided to develop a new firmware update to address it.
The update is expected to be released by mid-November.
Please upgrade at that time, as the new firmware will specifically resolve this issue.
I hope it does help.
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