Wow. I was checking the charge rates on my AC180 from AC “grid” input. I was getting about 370Watts into the AC180 in “Silent” mode. Then I switched it to “Turbo” mode. My state of charge magically jumped from 20% to 100% in about one second. At 100% SoC, the charging process naturally stopped.
That would be impressive it were believable. But I don’t believe it to be true. So now I can’t trust the SoC reported by the AC180.
A few related facts regarding the incident above: I switched from “Silent” mode to “Turbo” mode using the app. I was watching the SoC on the App, and the SoC on the units screen matched. I was charging through a short extension cord.
I was recording all this on my Bluetti app with a screen video capture, so I can share this if necessary.
Any ideas what’s going on here?
I’m currently fully discharging the AC180 (slowly), and will then fully re-charge it, in case this helps the AC180 “calibrate” itself regarding SoC.
Hi @BradMitchellPhotography
First off all, you doing a good job to discharge the unit and fully charge it by AC until its stops charging, so you done one full cycle. Sometimes you even need to do two full cycles.
If theese two cycles doesnt help, a firmware update of the bms sometimes helped. But as i said, i would go with cycle the unit at least ones and for the most cases it should be fine again.
greetings
Erik
@BradMitchellPhotography Hi, did the calibration help to solve the problem? Could you please share some updates?
I did a slow discharge simply by turning on the AC output, but not plugging anything in. Prior test shows the self-discharge rate in this mode is 12W, so this took some timeup to fully discharge. I just now started recharge in Silent mode at around 370W, which should take a few hours. I figure slow discharge and re-charge might be best for self-calibration, but it does take some time.
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I’m not really sure how to tell whether things are calibrated or not. So I’ll probably discharge again down to around 20%, then try recharging in the Silent, Standard
and Turbo modes to see if things work as expected in those modes. This is what I was originally doing when i noticed the anomoly to begin with. Should get that done tomorrow and will report back here.
@BradMitchellPhotography Thank you. Looking forward to your updates.
I did the calibration process.
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Afterward, I discharged again down to around 60%, then tried recharging in the Silent, Standard
and Turbo modes to see if things work as expected in those modes. Everything did work. There was no instantaneous jump to 100%. I got about 367W in Silent mode, 843W in Standard mode and 843W in Turbo mode. Not exactly sure why I didn’t get 1000W in Standard and 1440W in Turbo, but this might be due to the fact that I was charging through a short extension cord, which may have created a loss detectable to the AC180. This is not important in my application, so I didn’t pursue this further and am not worried about it. So all looks good.
@BradMitchellPhotography Thanks for your update.