High Frequency Inverter inducing high frequency noise

[elex_enthusiast]

I have 5KW hybrid Deye inverter on my solar set-up and it's inducing noise on both the grid and EPS ports thus messing up measurements on the workbench. All test instruments are connected to grid which is supplemented by the set-up. I am aware that high freq inverters are noisier than its counterparts but never anticipated that would affect much on the instruments until recently. What are your best practices to minimize its effects? Am thingking of having separate set-up using Low Frequency Inverter just for the lab or a good EMI filter with enough rating to handle the test gear I have. Your suggestion may help a lot. Thanks!

Inverter connected to grid


Inverter disconnected from grid

[jonpaul]

Bonjour:

1/ How was the mains voltage probed, what probe, isolation trsf?

2/ Set trigger of scope on LINE or MAINS, see if EMI burst is in sync to mains 50/60 or 100/120 Hz?

3/ Cheap Chinese electronics usually omits compliance, safety or EMI to save money.

The inverter topology, design, components are selected for LOWEST COST regardless of quality safety ofr compliance.

4/ Any external EMI filter requires special inductors and capacitors designed for the voltage and current and safety eg VDE X, Y caps.

Suggest to contact the vendor or manufacturer and get a refund.

Never run sensitive electronics on a junk inverter.

Chinese  = CCP = liars

Jon

[Faringdon]

Is the inverter in a metal case, and does it have an earth wire connection?
If not, then that might be part of the reason of the noisiness.

You could try one of those Schurter mains filters at its front end.
Or rig up a common mode choke and put that at the front end........put it in an earthed metal box, and have y caps up and downstream of it, which connect from line/neutral , to the earth.

You say its messing up the measurements...but doesnt the measurement kit have enough input filtering in order to give itself immunity from the noisy inverter?...it should do