EB3A Weird fan ramp up noise

Whenever the fan kicks on my EB3A makes a really strange 25 second sequence of electrical noises coming from near the intake fan on the left side of the unit. The fan is spinning slowly during this time. After this sequence the fan ramps up considerably to operating speed. Here’s a sound clip of it: SndUp | Post info. Has anyone else noticed or experienced this? Should I be worried?

The unit works just fine otherwise and this only happens when the unit gets warm and needs to active the fan.

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I think its normal, mine does the same plus at least one youtuber has noted it as well. A bit irritating but better than most of my other Bluetti power brick fans that run full blast whether charging or not.

I found the review you’re talking about:
Brand New - BLUETTI EB3A - 268wh LiFePO4 Power Station - Full Testing and Review - YouTube. Glad to hear I’m not the only one. Perhaps they can address this is a future firmware update if even possible.

It is an issue on some units. (mine included). The noise is a buzzing / vibrating noise coming from the fan voltage regulating circuit on the board. The nois is NOT coming from the fan itself. I purchases a good quality ($40) ball bearing fan and replaced mine. Same noise, did not change. The fan sound itself is better with my new fan, but the buzzing is still there.

Same noise, thank you for posting this. It’s not associated to the ball bearings of the fan because I tried sticking a small piece of paper into the fan to jam it temporarily. It still made the noise when the fan doesn’t rotate.

Hi @Jindo , we recommand you switch to mute mode, which will be better for noise reduction. Thank you :blush:

Could you enlighten us where this “mute” mode is so it can be accessed?

@Scott-Benson my guess is that they’re referring to the silent mode.

I created an account just to say how unusable the machine is while active. I don’t think it is the fan noise because on silent or normal, there is some kind of buzzing noise coming from the machine. It drove me crazy, and i couldn’t leave it in the same room as i am. even with the heavy discount, I find little use for this device if it will have such unbearable noise

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fyi - Silent mode is not referenced in the user guide at all. The only way I was able to set it was to download the Bluetti app, connect to my eb3 and then set Working Mode to Silent

I recall reading somewhere that you can set it using just the buttons on the unit itself. I’ll try and find the instructions.

Edit: I guess I was just dreaming and you do actually need the app. From the manual: " Note: EB3A supports Standard(268W)/Turbo/Silent charging modes. Turbo/Silent mode can be enabled on BLUETTI App."