EB3A fans noise - how is fix it!

I got tired of hearing the fan on the EB3a coming and going off and on, even in the silent mode. The wobbly noise is because of being unbalanced. My choices are 1. cut the wires to the fan and void the warranty. 2. Send it back to Bluetti for a replacement 3. Buy an external fan with metal ball bearings. As everyone could guess what option I took and now I have not heard the internal fan on, peace and quiet. Here is the link to the external fan.

Interesting solution! Do you plug that into one of the EB3A AC outlets?

correct and a multiplug on the second AC output plug.

While the fan was annoying for me as well at low speeds, I’m not sure (for me at least) it would be worth the additional overhead of always having the inverter on (which maybe uses ~25W plus 8W for the fan).

The EB3a uses pass-thru AC. I measured the AC input vs AC output and it was 45 watts in and 47 watts out using my Kiil-a-Watt meters. The EB3a has a UPS feature that does not use the inverter. Best thing about the EB3a !

Guess you never saw my posts about the fan noise. The noise you mentioned is not caused by the fan at all. The noise is generated by the fan voltage control circuit which buzzes. I replace my fan with two ball bearing fans of differing qualities and the buzzing never went away. The fan noise itself changed slightly and quieter but the throbbing buzzing was always still there.

Not sure why you would consider cutting one of the fan wires when the fan is simply plugged into the circuit board by a two pin disconnectable connector.

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First of all, cutting the wire was a joke. haha Second my external fan works perfectly, no noise from anything in the EB3a. I did not open the unit so where the noise came from is not the issue. Piece and quiet is what I need.

My point was that you’re sacrificing more power than usual to make this work making the system more inefficient in exchange for quieter operation.

You’re effectively forcing air in so that you don’t hit the temperature threshold that causes the internal fan to start spinning and cause the unwanted noise from the fan control circuitry.

That is true, I am using about 8 watts for the fan. So now how much wattage does the internal fan and all the circuits that regulate the fan use?

Hard to say other than the internal fan is spec’ed at 12V and 0.3A, so max of 3.6W. The circuitry probably adds a few more watts on top as well as 5W for the loudspeaker inside making those godawful noises :grin:

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8 watts - 5 watts = 3 watts for piece and quiet. Sounds good.