Hi @BLUETTI_CARE, i have bluetti AC200PL, when I turn on the AC button without a load, my bluetti makes a noise like a cricket or an electrical short circuit. If I turn on a load of up to 180-200 watts, this noise continues. If the load is more than 200 watts, the noise disappears.
Also, if you start charging the station, this noise disappears and it works very quietly.
I have encountered this problem with several other people, my question is, is this normal and happens at all stations, or is it a problem with a specific series of products?
Here is a link to how my station works.
Hi @Jeka, please rest assured, we believe the noise you mentioned is normal.
The “buzzing” sound you hear comes from the inverter’s “hiccup mode”, which is designed to reduce power consumption. When the inverter detects that there is no load on the output, it enters a hysteresis control cycle—switching intermittently between standby and active states to save energy.
During this process, when the inverter switches from standby to active mode to maintain output, the current changes rapidly. This sudden current fluctuation causes a slight sound inside the components. Some people can hear it, while others may not.
We also found that the sound is inaudible from the front but can be heard faintly from the side near the air vent. It fades away within about half a meter, which is fully within our product design standards and has no impact on normal operation.
In summary:
The purpose is to reduce power consumption.
The method used is “hiccup mode,” meaning intermittent internal operation.
The intermittent operation causes sudden current changes, which make internal components produce sound.
Thank you @BLUETTI_CARE for your reply, but unfortunately I can hear this noise throughout the entire room, even with the TV on. It’s not just me who hears it, but other members of my family as well, It is very uncomfortable to hear high frequency noise. It’s likely that my Bluetti unit is noisier than others.
At least a few other users are having the same problem… For the rest, it’s complete silence…
Perhaps you could solve this problem by updating it so that, for example, the inverter doesn’t switch to economy mode or something like that?
Hi @Jeka, We don’t consider this noise to be loud. However, if you need it, we can also push the latest firmware to you.
Please provide us with the SN code of your AC200PL and your current firmware version, and we will arrange this for you.
Thank you @BLUETTI_CARE
Perhaps this noise is not audible on the video as it is in real life, unfortunately it is quite annoying not only for me but also for my wife, I would be very grateful if you could fix this problem
SN: AC200PL2511000111966
Iot: v9041.10
ARM: v2140.05
DSP: v2130.13
BMS: v1056.03
