It’s definitive a faulty design.
The temp sensors are mounted on the two heatsinks but the transformer between the heatsinks is much hotter then the heatsinks.
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That mounting on the heat sink is OK as long as the calibrate for it. Not necessarily a flaw.
I do believe that not activating the fans no matter what in UPS mode is an issue.
Why is there a plastic wrap?
That mounting on the heat sink is OK as long as the calibrate for it. Not necessarily a flaw.
No, the problem is that the heatsinks are still cold but the transformer is already hot and then when the heatsinks get hotter the temp curve ist to steep. And due to the non-smoothed PWM the fan starts too late. It is buzzing but still not rotating.
I do believe that not activating the fans no matter what in UPS mode is an issue.
See above. 
Why is there a plastic wrap?
Two reasons. The voltage between the sinks is 12V and the fan is to small to ventilate the whole case.
The plastic is there to form a tunnel which directs the airflow over the warmest items. This is common design practice and good design as well.
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Generally yes, but in this case not. In both senses. 
The vent is way to narrow and strangley on the bottom side of the case.
Have a trial and let the EB3A running with open case. The fan hardly ever starts.
@tinking Could you post a picture with instructions on the capacitor mod please? And as far as the temperature sensor locations, do you think moving one of the sensors closer to the transformer would yield a benefit?
@snowstorm I believe the inverter overload issue might be related to heat soaking in UPS mode. When mine tripped earlier today, I picked up the unit and it felt way too warm for my liking.
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I don’t think the inverter overload is necessarily heat related. I have 3 units, 2 of them overload, and the 3rd one overheat when it is hot. The one that overheat doesn’t have overload problem and has been operating for nearly 2 months now in a cooler spot.
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@BLUETTI_CARE @BLUETTI can we please get a firmware update for this? I have two of these units, they either whine/buzz before the fan kicks in and then sounds like a vacuum cleaner which makes it impossible to use as UPS. If possible, set the fan speed to either be 0% (off) or 100% (on), no in between
Hi @Carbon, Regarding the issue of the EB3A’s fan noise, there is currently no new firmware available to address this. Generally, we believe the noise is due to the internal temperature of the machine being high, causing the fan to run at a higher speed. When the internal temperature decreases, the fan noise should be reduced. We recommend turning off the EB3A and placing it in a cool area for 3 hours before trying again to see if the issue resolves.
Additionally, we suggest enabling the silent mode for charging in the app. We hope this helps.
My EB3A is less than a month old, and I bought two of them. This one is connected to a wall outlet and powers a laptop and a desktop. When not in use, both the desktop and laptop are shut down.
About a week into using the EB3A, I woke up one day to find everything off. The desktop, which had been on, was powered off. The EB3A itself had no lights. I pressed the AC button again, and everything came back on, so I didn’t think much of it at the time. However, it happened again over the following weeks and then stopped.
This morning, I woke up to a clicking sound and found everything turned off again. The EB3A wouldn’t turn back on, and the LED + AC displayed an error code: “4-01.” I couldn’t find any information about this code online or in the manual. I unplugged the unit from the wall and pressed and held the AC button to reset it, which resolved the issue.
Since then, the fan has been turning on and off every 10 minutes for about 5 minutes at a time. The device is well-ventilated, and everything seems fine. It’s definitely not overloaded. I’ve set the fan to silent as well. And it’s in ECO mode. Attaching a few screenshots. Do I need a firmware update? Is there one available?
Hi Trinity, I’m in the same boat, my EB3A was unusable due to turning off and on randomly… Lates FW and changed the original fan with a better and more powerful one, a Noctua…
My only way to ‘fix’ was setting the fan to normal… If I change to silent chaos arises and random disconnects return…
Hope it helps…
P.S: I Couldn’t return mine because of my HW mod, but this looks like a FW/HW defect present for years and still unsolved… This was my first and last device from this brand, a shame…
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Thanks @AngeleToR . This morning my EB3A went straight down to 0 from 100. I’m trying to return this unit which is definitely defective at this point. I’m yet to hear from them.
Hi @Trinity, We’ve confirmed that your firmware is already up to date, so we are unable to push a new firmware update for you.
We would like to know your location and whether there are issues with unstable grid voltage or occasional power outages in your area.
We recommend disconnecting all connections and restarting the device. Does this help? Does the error still occur?
Please feel free to contact us if you need more help.
@BLUETTI_CARE currently have no device connected to it because it was randomly shutting down, making it pointless to keep anything connected. As a result, it was disconnected and restarted. Since yesterday, the battery has dropped from 100% to 0%, and now, even though nothing is connected and it is plugged into the grid, the charging has been stuck at 1-2% for the past 24 hours. The blue moving lines indicate that it’s charging, but it isn’t. It simply shows the battery depleted symbol.
No, I don’t experience occasional power outages. I’m in Kildare, Ireland. I have another EB3A connected to a router, purchased along with this one, and it’s functioning just fine so far. We work from home and bought these units as a backup in case of a power outage. While we haven’t had an outage since purchasing them, the random shutting down of this unit has caused my desktop to power off unexpectedly, making it difficult to work.
Hi @Trinity, We are deeply concerned about the issue you’re experiencing and have discussed it with our technical team. Unfortunately, there is currently no new firmware available to address this problem.
We recommend contacting customer service to arrange warranty support.
If you have any questions about how to find the platform’s customer service, please send me a message with your order number and email address so we can follow up on this matter.
Fan speed control in our EB3A is performed by PWM with a frequency of 100 Hz (this is the sound we hear when the cooling is turned on). This is a mistake by the developers! According to all the rules, the control frequency should be higher than the audio frequency, i.e. more than 20 kHz (usually 32 kHz).
P.S.
- To improve cooling, simply turn the fan 180 degrees so that hot air is pulled out from the inside. Then the internal power supply will be cooled first, then the radiators with transistors.
- Solder a 20 kOhm NTC in parallel to the existing temperature sensor. An additional sensor can be screwed on top of the radiator. After such a rework, the fan will turn on when the radiator temperature reaches 50 degrees Celsius.