I’ve been running my AC300 and 3x B300 for a year and half with no issue. I charge via PV and occasionally 30a from my generator.
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I added a 4th B300 after black friday and had an issue that it wasn’t getting charged. I figured this was because the SoC delta was too much (all three original B300’s were at 95-100% but the new one was 47%). I isolated the new one and charged it to 100% and added the others back in.
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Now I can’t seem to charge the whole system past 85% from my generator. It will spin up and charge just fine at ~3000w until that point. Then the generator spins down like it’s at 100%. The SoC’s on the batteries are anywhere from 73-95%.
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I’m full time on this system and staring down the barrel of a week+ of rain so I can’t drain everything to 0 to reset anything.the whole system
Hello,
you have to calibrate all B300 together.
So discharge everyone to 0% and then charge to 100% via the AC-grid, ideally with 7A without that
consumers are connected.
Then everything should work fine.
As stated, can’t do that. I’m not on grid and my cabin is running off my system. I can isolate each B300 and charge them to 100 separately but I already kind of did that. I was at a point where the SoC range was 98-100%.
Solid question that I would love to get answered because I have two batteries and wish to add another battery…to make three. I still have ac but am going completely off grid. How would you calibrate the batteries in an off grid situation? …and why only 7a?
What kind of UPS mode is it set to? There is a solar priority mode which only charges using AC to a certain set SOC (80% default I think). Check to make sure that isn’t enabled.
You can try unplugging the higher SOC B300, just leaving the lower SOC one plugged in to see if that charges it.
@eveljkov You can check to see if there is new BMS firmware that can be upgraded, and upgrade the BMS firmware of all battery packs to the latest one. Then empty all battery packs and try charging them again.
I did that when first troubleshooting. It worked for a bit but then the delta increased and now it’s out of whack again. UPS mode didn’t change but good thought.
Again, can’t drain them all when I’m reliant on them and my only non-solar way of charging is a generator. 12kwh is a lot to charge by generator, even at 30a. A BMS calibration process that doesn’t include draining and refilling would be very useful.
I am hesitant to update firmware when there is no rollback procedure or firmware change notes from the devs.
Again…move the parts all to where you have AC power and calibrate them all together.
That’s the only way it works in the end.
This has nothing to do with firmware.
Hello BLUETTI_CARE,
I have a problem with mine 4. B300.
The power indicator has been flashing since today.
It lights up and then it goes off and flashes
8 times. Then it comes on and lights up for 3 seconds
and then flashes again 8 times and so on.
I calibrated twice and checked all connecting cables.
But the B300 only flashes when it is 100% charged.
If it is less than 100% it lights up permanently.
The Firmwares are all new (from AC300 and all B300).
Otherwise the system works perfectly.
@Akel If it flashes 8 times, that means Connection timeout with M1 board. However, according to the description, it seems that it may flash 9 times, referring to over voltage. I would like to confirm that if the light does not flash when it is not fully charged, can it be used normally?
When the charge is below 100%, the power indicator does not flash and the system functions normally.
But despite calibration, the charging states of the 4 B300s differ
@Akel So you dont get this error when 3 of the b300 batteries are connected to the ac300? It only happens when you connect the 4th one and hit that “100%” SOC when charging?
I would connect that 4th “problem-child” battery to the ac300 unit by itself, and see if you get that error. Also, at that time, double check to make sure that the firmware is updated on it.
Ok, I’ll update firmware but I’ll have to wait until summer when I can get more than 3 hours of sun to recalibrate. I have found that if I run my generator, the little bit of sun I’m getting will fill to 100%. A manual calibration or a better calibration process would be a fantastic feature.
I think what’s happening is the AC300 is trying to switch to a lower charging rate when it gets to one battery but my generator doesn’t like the change and the voltage drops which triggers the AC300 to error and restart the charging at the full 30a then throttle down to a lower rate which triggers the generator and causes a cycle.
Yes, the firmware at all B300 is the same an actual.
I tested it and B300 No. 4
does not flash at 100% when it is the only one connected to the AC300.
Neither when the AC grain is switched on or off and / or
with consumers switched on
AC output.
But as soon as I connect one or more B300, B300 No. 4 flashes again.
If I disconnect the other B300 again
B300 No. 4 flashes and error 098 BMS appears
Over Voltage is displayed.
If I then turn off the AC grid and again
turn on and discharge below 100%,
the error disappears.
I also swapped all the connecting cables with each other.
I also varied the order in which the batteries are connected to the AC300.
I can’t explain where the problem is
is.
At the moment the AC300 is running B300 No.4
flawless.
It would be nice if Bluetti could help me.
Is the error reporting for a specific battery pack? Or no matter which battery pack it is, as long as 4 battery packs are connected, an error will be reported?
What is the SOC when the error 098 BMS appears? Is it close to 100%? If yes, please check no3.
If it is AC charging, you can try to set the UPS mode to PV priority mode and set the default value to 95%; if it is PV charging, the DC charging cable has two sets of MC4, you can try to connect the solar panel only A set of MC4, test both sets separately to see if there will be any errors.
Regarding 1. No matter which battery pack it is, as long as 4 battery packs are connected, an error is reported.
But only if battery 4 is included.
Even if only one or two of the other batteries are paired with battery 4.
If only three batteries are paired with the AC300 (without battery four), no battery flashes and no error occurs.
Regarding 2. The mode is standard UPS and in the other modes the SOC is 100%. Then battery four flashes.
Regarding 3. It is an AC charge. I set the UPS mode to PV priority mode and the default value to 95%. Already when battery four is below 100%, i.e. 99% and less,
Battery four stops flashing and the error disappears.
The problem only occurs as soon as battery four is at 100%.
PV loading i have not testet, because it’s no Sun for test now.
to recalibrate. I have found that if I run my generator, the little bit of sun I’m getting will fill to 100%. A manual calibration or a better calibration process would be a fantastic feature.