I bought a used Bluetti EB3A off of Ebay, and had the seller unbind so I could bind it to my account. It was sold as not working/charging. This being said, once I recieved it, and ran AC input, and AC output until the battery went down to 99 percent, I was able to remove AC power and the unit was charging off of a 50 watt solar panel and running off the battery. I do have the DC short error, but cannot discharge the battery to far before I get error A006 Battry Pack communication error, which shuts everything off. I want to see about reinstalling firmware. My SN is as follows:
SN:EB3A2326003551440
ARM: v2062.03
DSP: v2056.13
I am new to bluetti, and have been searching around for answers and it seems that firmware tends to be the first/best step forward. thank you very much for your time.
Hi @CPLSeraphim, Thank you for contacting us.
Currently, we do not have a firmware available to fix this issue. Based on the information we have gathered so far, the problem may have been caused by a failed firmware update previously.
To address this, please first update the app to the latest version, clear the app cache, and then attempt the firmware update again.
When performing the update, please ensure that your mobile phone is as close as possible to the EB3A. If the update fails due to a Wi-Fi connection issue, please try turning on your mobile data instead.
We look forward to your feedback.
So after clearing cache and everything, there is no update. Not too much of an issue there. It seems like the more I charge and discharge, the more sense everything is making. I am still undergoing some of the testing phase here, but I am finding it interesting. I will post more as I am figuring it out. The biggest issues currently seem to be that 1st, the % does not properly match, so when it gets down to like 65%, it is actually 0%, which is why it shuts off. This makes sense, and I have been draining and charging for the last few days to try to “reset” or whatever the term is with the BMS to properly read. There is still random errors like the Battery pack communication error, the DC short and low PV voltage at times. What also seems to be interesting is that, when drained, sometimes it shows 100% and I can’t actually turn it on. I think I am in the process of getting this thing running good. I understand this was a used ebay purchase with issues, and I am hoping this thread can help others who are, like me, not super versed in Solar generators and bluetti’s, but are looking at getting into it at a great price for what seems to be a pretty nice system.
Alrighty, so after some more testing, we have interesting results. The Bluetti EB3A charged up and I was able to turn it on on its own. Initially I have only been able to get it on by charging from solar through DC, then adding AC and able to run it and then unplug things. Being able to turn it on hours later was great, and I believe this has to do with charging and discharging a few times to wake everything up. What I find interesting is that I get the DC short only when the Bluetti is first getting charged, as the screen is flashing, just starting to get a little charge until the screen fully illuminates and then I can finally add AC power to charge it. What is also amusing is that it will say 100% even though it is completely drained, and I have to run something (a window fan) that pretty much runs through the bluetti until it drops to 99%, then it starts accepting charge (this is the point where the DC short stops occuring.) What else stands out is that it shows 99% as it is charging, even though it has been receiving in the neighborhood of 150-160 whats input for over an hour. Yesterday I ran my initial testing of running it down using my phone charger and my TV, which initially started at 72.5 watts, but slowed down to 55 for most of it (my phone had fully charged and changed output, but my estimates per 15 minute intervals were set for a stead 72.5 watts.)
What happened was that, at an hour and 15 minutes, we were pulling 59 watts, and it showed 72% remaining, at 1 hour and 30 minutes, we were pulling 55 W and showed 67% remaining, and at 1 hour and 45 minutes, it showers 62% remaining. At 1 hour and 46 minutes, the Bluetti eb3a shut down. I will rerun the test today with just the TV to keep a more standard watt usage and ensure that the record keeping is accurate the whole time along with a full charge as it appears to be taking in quite a bit even though it has said 99% the entire time it has been charging. Estimating at the high end for 72.5W for 1 hour and 46 minutes, gives us about 128.325 watt hours. It is possible was not fully charged, and it is possible the previous owner may have damaged something as this is an ebay purchased unit. We are miles ahead of where we started with this unit, and I am video recording segments of todays everything, from waking up the unit with DC in, to adding AC and showing the DC short vs when there is no DC short, charging and soon discharging. Right now it seems like there is an issue with it reading the proper amount of battery life on the screen. Taking in 155W for over an hour, perhaps we are revitalizing these cells or something. More to come as we test. Just want to keep this thread up to date.
Maybe battery cells are not balanced, its common with EB3A
and regarding that DC short errors there are videos that shows people plugging and unplugging a cable inside EB3A that removes that short might wanna look into that in youtube.
I am familiar with the DC short fix, and have performed it. The DC short only shows up when the battery is discharged and is just at the start of charging. That was my first step in this whole process… lol.
As for todays test, I had fairly similar results. Today was a consistent 53 W from just the television. This stayed running from 1115-1327, so 2 hours and 12 minutes. so roughly 116.6 watt hours… and the unit died somewhere around 60%. 40% of 268 should put us around 107.2 watthours, and we used approximately 43%, so not terribly far off. I will be getting a Kill-o-Watt meter for verification, but that will be sometime after Christmas. Until then, I will be chasing battery balance and seeing what to do there, and how to check that.
I also have to find my good voltometer (I bought a new one, but the numbers bounce all over) and am going to check the balance of the cells. Will update with more information when done after fully charging. I will check numbers. Prior I was charging and discharging to see if they would rebalance.
So this corner of the board seems burnt a little and really gets hot. Just tossing thisnin here for record.
These are both sides of the same part of the board.
Also, doing another rundown test, I was using a slowcooker pulling 236W and made it 22 minutes before shutting off. That is only 86.5WH, which is less than our previous 2 tests, but also the bluetti said it was at 57%. Least watthours used, furthest drain on percentage. I am looking for another for parts to see if I can swap parts and see if it is one thing. That being said, still looking for my good voltometer. The bad one is literally jumping around everywhere and then into 0 for the entire battery, and this was before I ran the test with the slowcooker. Again, this is just for reference.
yeah that exact section of the board i watched a few youtube videos it was getting super hot, some of them were even smoking, feels like a heatsink is required there, i own one of these units its makes me worry as well maybe @BLUETTI can explain what is happening there. its too hot that burning it off conformal coating
Hi @Sorenalike, we recommend users ensure proper ventilation and heat dissipation for the device.
As long as it is used in a well-ventilated environment with an appropriate temperature and is powered off to rest for a while after heavy usage, there will be no issues.
In addition, please do not place any items on top of the EB3A, keep it away from fire sources, and avoid exposure to moisture.
We do not recommend that users disassemble the device by themselves. If any problems occur, please feel free to contact us to arrange warranty service.
Why not let us adjust the fan speeds instead with software updates? Would be nice if you consider that, summers can be hot.
Hi @Sorenalike, the built-in fan of the EB3A is relatively small, making it difficult for this small fan to handle all heat dissipation requirements in summer.
We recommend using an external fan to assist with heat dissipation in summer, so as to maintain a well-ventilated environment. In addition, it is advisable to let the device rest for a while after heavy-load operation.
The fan speed is comprehensively determined by the BMS based on internal temperature, load conditions and operating duration, and our firmware cannot directly intervene in the fan speed.
Thank you, oh i wish we could control the fan speed, but i understand. i don’t think heavy load is the issue seems like that corner spot that you saw in the video gets hot anyway, my use is between 100-150w max i haven’t opened up mine but i can feel the heat from the plastic area on top of same location so i assume it happens on all of the EB3A products and its in such a weird area that it is almost impossible to point a fan in there without opening the device up 
.
Hi @Sorenalike, thank you for your suggestion. We have forwarded it to the R&D department for their reference.
We fully understand your concern. Placing a fan next to the air vents should help improve the heat dissipation of your EB3A. That said, the device’s built-in cooling fan will still serve as the primary heat dissipation method.