reardencode
New Member
Hopefully this helps some of the folks who have reported 15kHz noise problems with their Sol-Ark (/Deye/SunSynk) inverters. I've had mine running for about a month now, and it's located in the garage directly below my pantry (where the microwave is located). My wife and kids have been reporting a bothersome 15kHz noise in that area since it was powered on, and I was expecting to need to install sound proofing on the garage to block sound transmission into the living space. After some investigation however, we discovered that the noise is loudest inside the microwave. This indicated that it's not a matter of sound transmission but electrical conduction or resonance.
I found this post where Wiggly Electron shows a 50-turn iron core inductor he built to solve similar noise with his installation. I'm happy to report that my much easier to build solution also stopped the noise as well.
I bought some MnZn toroids and THHN, and made an inductor with 10 turns (10 passes through the center of the toroid) yielding 1.2-1.7mH of inductance.
I installed it in series between the microwave's circuit breaker and its hot line, and got a 40dB reduction in 15kHz noise within the microwave.
Obviously this will not solve the 15kHz noise problem where it's emanating directly from the inverter, but hopefully it helps some folks. Any appliance with a switching power supply could have a similar problem, so you may need to hunt down the noise culprit and add multiple inductors.
The only downside I'm aware of to this approach is that it shifts the power factor on that circuit toward the inductive (about 1%, I think); shouldn't be a problem.
I found this post where Wiggly Electron shows a 50-turn iron core inductor he built to solve similar noise with his installation. I'm happy to report that my much easier to build solution also stopped the noise as well.
I bought some MnZn toroids and THHN, and made an inductor with 10 turns (10 passes through the center of the toroid) yielding 1.2-1.7mH of inductance.
I installed it in series between the microwave's circuit breaker and its hot line, and got a 40dB reduction in 15kHz noise within the microwave.
Obviously this will not solve the 15kHz noise problem where it's emanating directly from the inverter, but hopefully it helps some folks. Any appliance with a switching power supply could have a similar problem, so you may need to hunt down the noise culprit and add multiple inductors.
The only downside I'm aware of to this approach is that it shifts the power factor on that circuit toward the inductive (about 1%, I think); shouldn't be a problem.