My PC(PSU) is making white noise when am on Sunsynk/Deye

even my cordless phone speaker is very noisy

only when i am on the inverter

please any help ? what i should do ?

 

Have a similar issue with white noise coming from all my speakers around the house

Had the same problem also with the Axperts, which I had in my system before - so do not think it is a Sunsynk/Deye-specific problem

I only get the noise if any of my aircons around the house (connected to critical load circuit) are running. If they are off, the noise is not there. But if even 1 aircon is on, the noise is on all speakers (e.g. aircon in bedroom on and noise also on speakers in living room - circuits on separate electrical breakers on my DB board)

And I think it only occurs when grid is connected - when we have loadshedding I think the noise is not there (might be wrong though)

5 hours ago, Mahdi said:

only when i am on the inverter

Do you mean when when you are running on solar or battery?

5 hours ago, Mahdi said:

please any help ? what i should do ?

Have you tested if they noise always occurs? Or only if you have certain other loads on your inverter?

7 hours ago, wolfandy said:

Have a similar issue with white noise coming from all my speakers around the house

Had the same problem also with the Axperts, which I had in my system before - so do not think it is a Sunsynk/Deye-specific problem

I only get the noise if any of my aircons around the house (connected to critical load circuit) are running. If they are off, the noise is not there. But if even 1 aircon is on, the noise is on all speakers (e.g. aircon in bedroom on and noise also on speakers in living room - circuits on separate electrical breakers on my DB board)

And I think it only occurs when grid is connected - when we have loadshedding I think the noise is not there (might be wrong though)

Do you mean when when you are running on solar or battery?

Have you tested if they noise always occurs? Or only if you have certain other loads on your inverter?

when i am on battery (offgrid) the buzzing is there 😕  i cannot bear it

its always there .. no matter loads..

does that mean its not pure since-wave ?

 

 

Yea i also have the same problem from my PC PSU . At first it was crazy loud and i had to switch it off at night to be able to sleep ,now it has gotten much more silent but i can still hear it now and then, other appliances in the house are all fine. I think lots of people cant hear these high pitch sounds that are over 40 years of age,asked some older people if they could hear it and they couldn't.

Any way that you guys can check your frequency to see if it is maybe off by 1 or 2 Hz?

On 2022/02/11 at 9:06 AM, zsde said:

Any way that you guys can check your frequency to see if it is maybe off by 1 or 2 Hz?

frequency is 50 hz stable as reported from the inverter

 

On 2022/02/11 at 9:30 AM, Mahdi said:

does that mean its not pure since-wave ?

The switching frequency of Axperts is around 19.2 kHz, which young ears might well be able to hear. There is filtering to remove some of the switching noise, but no filter is perfect, and it's essentially at 100% "volume" before the filter. You might be hearing the magnetics inside the inverter, or magnetics inside loads, like a PC power supply.

If it's mainly the latter, more filtering might be appropriate. I'm pretty sure that commercial filters are available; you'd want to put the filter near to the inverter.

With the Axpert models that have the higher voltage Solar Charge Controllers, and nearly all modern grid-tie and hybrid inverters, there is high frequency electrical noise on the PV cables as well. It's possible that those cables and/or the panels could "sing" at the switching frequency.

7 hours ago, Coulomb said:

The switching frequency of Axperts is around 19.2 kHz, which young ears might well be able to hear. There is filtering to remove some of the switching noise, but no filter is perfect, and it's essentially at 100% "volume" before the filter. You might be hearing the magnetics inside the inverter, or magnetics inside loads, like a PC power supply.

If it's mainly the latter, more filtering might be appropriate. I'm pretty sure that commercial filters are available; you'd want to put the filter near to the inverter.

With the Axpert models that have the higher voltage Solar Charge Controllers, and nearly all modern grid-tie and hybrid inverters, there is high frequency electrical noise on the PV cables as well. It's possible that those cables and/or the panels could "sing" at the switching frequency.

is it rfi noise? do i need an rfi ac filter? https://www.amazon.com/gp/product/B016EISUNU/ref=ox_sc_act_title_1?smid=ATVPDKIKX0DER&psc=1

or another kind of noise ? 

ferrite bead didn't help

please can you find me hardware on amazon ? 

 

On 2022/02/14 at 10:24 PM, Mahdi said:

is it rfi noise? do i need an rfi ac filter?

I think it's audio noise, caused by VLF (Very Low Frequency) Radio Frequency Interference. I'm no expert on this, but I suspect that an RFI filter as linked may help.

The audible noise is possibly caused by an effect called magnetostriction.

[ Edit: audio → audible ]

Edited March 9, 20223 yr by Coulomb

On 2022/02/15 at 3:46 AM, Coulomb said:

I think it's audio noise, caused by VLF (Very Low Frequency) Radio Frequency Interference. I'm no expert on this, but I suspect that an RFI filter as linked may help.

The audio noise is possibly caused by an effect called magnetostriction.

 

can you explain ? 

 

7 hours ago, Mahdi said:

can you explain ? 

Not much to go on. I'll guess that this is the output of the inverter, showing some switching frequency superimposed on the 50 Hz sine wave. The switching is square wave, but will get rounded (more like sine waves) by the various filters. It seemed to have a period of about 3 divisions at 20 μs/division, or about 60 μs period, or a frequency of 10⁶/60 = 17 kHz. That 17 kHz will find its way electrically into audio systems, and will even mechanically vibrate ferrites in power supplies by the process of magnetostriction, causing audible noise.

17 kHz is not something I'd be hearing, but younger ears certainly could, and it could be loud and extremely annoying.

I have the same problem at home is there any fix to this??? 

If you are on a sunsynk ask them to update firmware to the latest version - it apparently mitigates this issue