OMG im started having the exact same issue you are having 
im like what is going on with this thing and im using thw latest Firmware, did ALL different teoubleshooting steps and still randomly fan kicks on and resets 
Here is something i have noticed on the Left side of the EB3A, and i have evn turned it fully off, not plugged in, there is a random green little light that is on as well inside you can see from the vent picture that i had taken that this light is on
How long does the green light stay on? If it goes off after a period of time, I’m wondering if it might be some type of a capacitor indicator light?
I read somewhere, I think over at the Bluetti Facebook group, that Bluetti Global may have said that green light is there for their technicians, to know if it’s safe to open up the unit or not. If it’s green then the unit can’t be opened yet. I think 
With 2057.11 and then Dsp v2056.10, does UPS work right even with ECO enabled?
Same UPS problem here. Received 2nd EB3A 4 weeks ago. Running in UPS mode for cable modem and router. It ran fine for the first several weeks. 2 days ago it starts shutting off. AC load is 47 watts. It says “inverter overload”. Why it’s using the inverter in UPS mode is beyond me. When it shuts the AC off the unit is warm, birding hot to the touch on rear and side on the right side of the unit. If I reset and turn the AC back on, it overloads abd shuts off after 45 minutes. It is set to standard mode and the ECO mode is off. The fan isn’t running when it shuts the AC off. I’ve never heard the fan running.
My first EB3A was ordered from the EB3A product introduction. It’s been powering my CPAP and alarm clock flawlessly for months.
I have not encountered the Inverter Overload error but this latest firmware still introduces a bug where when charging via solar from a state below 100 percent back to 100 it causes the AC output to reset. Charging from AC (UPS bypass mode) does not cause this issue.
I believe even though in UPS bypass mode, to me the inverter is still in effect, i think the AC input keeps the batteries topped off and not a true shunt bypassing the inverter. Hence the reason why while still on UPS bypass you are limited to the 600W ouput.
New owner here, first post. All FW Updated, standard mode. This morning it showed OVERLOAD error.
Logs on router show after 12hrs of connection went out. Unit is set to AC UPS bypass mode, redoing trial but not with my internet now. Not sure what else I can tweak. Will email Bluetti
Overload again after 5 days,
I’m not using solar. I agree that the load is limited to 600 watts, but my load is a total 47 watts, nowhere near 600 watts and I’m getting inverter overload error messages and shutdowns.
@NewownerEB3A Yea thats interesting. I would definitely reach out to @BLUETTI Customer support via email and see what they recommend.
I’ve had my EB3A since August. Firmware is updated to latest. In Standard mode with Eco off, plugged into AC. Running about 130 watts for desktop computer, monitor and external storage for 8-10 hours per day.
I get one or more sudden shutdowns a day, which runs the risk of corrupting files that I am working on.
The EB3A has a function as a power source, but it should not be used as a UPS for sensitive equipment.
I’m disappointed in the product.
Hi @Sonant , Sorry for inconvenience caused.
EB3A as a backup UPS power supply device has a 20ms switching time, this time may cause the power to disconnect. We recommend you to use offline mode without AC connection so that there will be no 20ms switching and disconnection.
Eb3A owner here same problems as posts above…unit goes to zero from a 30% full battery to 0% in a instant. Had this happen at least 6-12 times, firmware has been updated. Anyone know if they are fixing this or not?
I can’t get my EB3A to power any load in UPS mode without shutting down with an inverter overload warning. Supposedly it is in a bypass mode. My total load is less than 40 watts, nowhere near the 600 watt inverter rating, so how could it possibly be overloading the inverter? The product is obviously defective and should be recalled by Bluetti. There seem to be many of us with this problem
I’m going to chime in here as well. Running ARM v2057.11 and DSP v2056.10 on my EB3A which I just bought on Amazon. I too am unable to reliably use the EB3A’s UPS feature because the AC outlets seem to randomly turn off with the “OVERLOAD” message displayed with the AC light blinking after a while - I’m not using DC outputs at all. I’m only powering 1x router, 1x cable modem and 1x ethernet switch through a basic power strip.
@BLUETTI, in reading your previous responses, this has nothing to do with the 20ms UPS switching delay. The main concern is that AC outlets are unexpectedly being shut off with small loads (< 100W) when the station is at or near 100% SoC with an AC OVERLOAD error. The only way to recover from this is to manually turn off AC and turn it back on via the button.
Secondly, the EB3A will shut off with ECO mode on after the configured time, but this is not the case here because of the OVERLOAD error showing when AC is turned off unexpected. If ECO mode is causing the AC to turn off it would not show OVERLOAD and it would not shut off if there is a minimum AC load.
Just trying to make sure we’re on the same page here… Are you plugging in your AC charging brick first? (The screen should then show UPS on the eb3a…) and then plugging in your AC appliance, and then turning “on” the AC side??
I’m testing these UPS issues on 3 different EB3A’s right now with a 65w AC load, and not able to replicate the “OVERLOAD” on any of them. They all have been updated to the most recent firmware as well.
I’m not plugging the AC IEC cord into the EB3A first. I have AC output on with ~40W load (router, switch and cable modem) and then plug in AC input. After a few seconds the UPS indicator turns on and then after some time the AC OVERLOAD condition occurs and AC output is disabled.
@bxm6306 ok try the exact same load, but this time plug the AC charging cable in first, then plug in your AC load, and then turn on the AC output to give power to your load. See what happens
Ok, here’s the test plan.
EB3A Test setup:
Test #1:
Test #2:
I’m re-running Test #1 right now and will run test #2 once I encounter the overload condition up to 20 hours and then move to test #2.
Update 1: After 7hr and 3min the UPS indicator had switched off and on at least 10 times (likely due to momentary Grid undervoltage conditions) in total but AC output was steady. However a minute later I heard the relay switch twice, still no overload, but all AC devices reset - so the test continues. After a total of 20 hours I have not encountered an overload condition.
Update 2: Re-doing Test #1 but instead of feeding AC input from Grid I’m feeding from my EB150. Only event was after 3, 4 and 9 hours the AC devices rebooted due to non-continuity of AC output but no overload condition. First AC OVERLOAD at 11 hours! Moving to test 2…
Update 3: I couldn’t cause the overload condition with test #2.
