Has this worked for anyone?

Okay so I'm not just going crazy XD

It's not so bad for me. It's the light in the garage and ny own PC while my BFs PC is silent. He is going through a UPS so that could be why his doesn't make a noise.

I saw this thread today while Google searching on "deye hybrid inverter makes high pitched sound".

I seem to have solved the problem a while ago.

I was regularly getting this sound on hotter days. We tolerated the sound but it was irritating.

I then noticed, on the Solarman app, that the DC temperature would go as high as +76 C on these days and that the Deye spec required a maximum of +60 C.

I then decided to fit a rack of 3 small 80x80 mm 220 V fans under the Deye inverter heatsink. I also purchased a temperature sensor controller which I attached to the hottest part of the heat sink so that the fans only ran between certain temperature ranges.

All of this was quite inexpensive. The sensor was R75 (Chinese) and the fans (Chinese) were about R140 each

Since doing this, the noise has disappeared. The fans make a noise but it is not a high pitched noise so is much more tolerable.

Also, on the Solarman app I see that the the fans keep the DC temperature below 60 C most of the time. Some times the temperature gets up to just above 60C. However the noise has not reappeared.

Of course, the temperatures have been moderate this December.

I think that the high DC temperature causes the noise, particularly when the temperature gets higher i.e. when the DC temperature is higher, the noise is louder.

The DC (solar panels) really only starts working during the day.

Edited December 17, 20241 yr by TimJohnson

Hi,

Im back again unfortunately. This high frequency noise has come back on my sunsynk inverter despite pressing “low noise mode” on the sunsynk inverter. When I turn back to Eskom, the high pituch noise disappears. It’s only present when I go through my 16kw sunsynk inverter. There are 2 high pitched frequencies one at 15khz and another around around 19khz. I measured these on a condenser microphone. Any suggestions or electricians or electrical engineers that can assist with this problem? Based in Joburg? I’m a sound engineer and recording artist so this is urgent unfortunately

10 hours ago, Jay123 said:

I’m a sound engineer and recording artist so this is urgent unfortunately

Does this sound carry through to your recording studio?

Yes. In fact, the frequency seems to be going through the electrical current of the microphone itself now and the microphone is picking up this frequency.

Just cool the inverter down with fans, like explained by various people - cheap ans easy fix.

To explain again, this is not the sound coming from the inverter. This is a high frequency sound coming from appliances in the house caused by the current coming from the inverter. When I switch over to Eskom, there is no high pitched noise coming from the appliances in the house…

5 hours ago, Jay123 said:

To explain again, this is not the sound coming from the inverter. This is a high frequency sound coming from appliances in the house caused by the current coming from the inverter. When I switch over to Eskom, there is no high pitched noise coming from the appliances in the house…

From what I understood from earlier posts, are that when the inverter gets too hot, it creates the interference (components overheating?). It's worth trying out, if it doesn't help then perhaps more drastic measures need to be taken.

See some cooling ideas here

This does remind me of old computers that had grounding issues to the chassis, they created some high pitched noises through the mics/headsets. I am wondering if there might be some grounding issues in the housing electricals, or at least, in the part of the electricals near the inverter.