UPS (Uninterruptible Power Supply) Adversely Affects WiFi Performance?

[jzchen]

I recently purchased a BQ16 Pro to patch up (horribly) poor WiFi speed in my sleeping quarters. I plugged it into the 120 V wall outlet typical of here in the USA. Everything including WiFi ran great. Then I decided to shore it up with a UPS so if power went out my ASUS network would not shut down. I did not get a pure sine wave version so it is specifically what's called a simulated sine wave (non-pure sine wave) UPS. Low and behold, TERRIBLE WiFi speed!

Ethernet does not seem affected but WiFi becomes terrible!!! (See attached speed test screenshot).

I think I finally found the root of my home WiFi problem. (Some AC adapters may be immune while others sensitive. A recently added RT-AX5400 continued to use the same AC adapter from my old RT-AC68U as they listed the same V and A output, so I guess the older ones may be the non-sensitive ones. The new ones tend to cause grave issues with WiFi).

 

[bbunge]

FWIW - I have a CyberPower AVRG750U which runs a NAS, router and a RPI3 with no issues. We had a power outage of almost an hour a couple of weeks ago and the UPS kept everything running. The UPS is one of those Simulated Sine Wave devices.....

 

[Squall Leonhart]

the frequency of the sine wave (50/60hz) isno where close to the harmonics of a 2.4 or 5Ghz radio

 

[jzchen]

FWIW - I have a CyberPower AVRG750U which runs a NAS, router and a RPI3 with no issues. We had a power outage of almost an hour a couple of weeks ago and the UPS kept everything running. The UPS is one of those Simulated Sine Wave devices.....

Hmm. Thank you. I added a RT-AX5400 a few months ago. I reused the AC adapter from my EOL RT-AC68U. (That one is really old). It has been working great...