I have an AC500 and 2 B300S
I drained the batteries to 0% as instructed to do every 6 months
I am recharging them on the grid, but they only charged to 30% and stopped charging
When I look at the SOC for each battery individually Pack1 shows SOC 21% and on Standby. Pack2 shows SOC at 40% and on Standby (that makes no sense). The AC500 is plugged into the Grid but shows 0w
This happened to me over a year ago and Buletti replaced both batteries. Now the same thing is happening again.
IOT - v9041.10; ARM - v4044.07; DSP v4045.30; BMS v1022.09
Thanks for responding, Erik. There was an error code showing that the SOC was 0, but after it started and now stopped charging there has been no error code. I’ve only charged with the grid so far.
Hi @SureHope, We would like to confirm whether both of your B300S units have BMS version v1022.09.
Is the ambient temperature suitable?
We recommend disconnecting them from the AC500 and charging each B300S separately. It would be even better if you could test both AC and DC charging.
Have you tried recalibrating the batteries? We suggest trying again—does this help?
Many thanks to @Selfmadestrom for the concern and assistance on this matter.
I drained one of the B300S units to 0% SOC again, and recharged from the grid. I immediately got this Alarm - 054 D-Bat Drained. The AC Input charge leveled at 1750W and charged the B300S to 30% and stopped charging (AC Input 0W). I am very concerned that this is the second time this has happened, originally with the initial B300S units I purchased, and now with the 2 B300S Units that Bluetti replaced. What now? Is the problem with the AC500?
Hi @SureHope, We would like to confirm whether you disconnected the B300S from the AC500 before discharging it. The B300S cannot be fully charged when used independently, so we believe this is an issue with the B300S rather than the AC500.
When the B300 discharges to 0%, it is normal to receive a “battery depleted” error.
It seems that AC charging only reaches 30%. Have you tried car charging or solar charging the B300S? We believe this might help. Please note that when using solar charging, you need to select panels with an open-circuit voltage of 12-60V and MC4 connectors.
Additionally, please ensure that the ambient temperature is within a suitable range. If the environment is too cold or too hot, the system will stop charging to protect the battery cells.
Hello.
To avoid any misunderstanding (because I believe you recharged one of your B300S connected to your AC500, given that you indicate that “the AC Input charge leveled at 1750W”): your B300S must be disconnected from your AC500 as Bluetti_care suggests. So to recharge your B300S, you must use one of the two dedicated connectors on your B300S (see diagram below).
Either you have a T500 (or T200S) AC DC adapter: picture below, in which case you can use the AC Charging method (see diagram below).
If you don’t have this adapter, you can use the solar input of your B300S and solar panels to recharge it (PV charging méthod) but be careful, you need to select panels with an open-circuit voltage under 60V
I finally had a day of sun to charge each of the two B300S units with solar. One of the units charged to 99% (the max of this battery I received as a replacement of my initial faulty battery), and the other to 64% (It was still charging as sun set for the day). Now that we know that the two batteries will charge with solar, what should be done about the problem of them not being able to be charged from the grid?
Hi @SureHope, We recommend charging the second B300S to 100% as well, and then connecting the full setup — AC500 with two B300S batteries.
Could you test whether this allows the system to return to normal operation?
Please also check if grid charging works properly after the connection.
Snips1, thanks much for your detailed instructions with graphics. I don’t have a T500, but I am now considering getting one. Do you know if you can charge the B300S directly with a T500 while also charging with grid or solar through the AC500?
Hello,
I should let you know that I don’t have an AC500 or a B300s, but I do have AC200max and a B230.
With an AC200max connected to the B230, I can indeed charge the B230 via the T500 adapter and simultaneously have my AC200max powered by the grid and solar. This isn’t documented in the manual, but it works!
I think it should also work for your AC500+B300s+T500 configuration.
In any case, there’s no security risk; you have nothing to lose by trying.
Hi @SureHope, We still haven’t gotten your answer, we wonder if this problem is resolved.
Our engineers are very concerned about the issue you encountered.
They recommend setting the UPS mode to Standard. Does this help?
Please feel free to contact us if you need more help.
By the way, please note that if you need my assistance, please @BLUETTI_CARE, otherwise, I might not see your message and be able to help you promptly.
Thank you for Snips1’s kind help!
