Anern ECO-4200 hybrid inverter 230v

[anti77]

Opened up my inverter to see why the wifi cuts out when solar power generation goes over 1500w. I thought i'll post some photos.
Motherboard (identical to one sold as VICTOR NM-II 4.2):


Comm board:

Comm board back:

Comm board closeup:


Display:


Control board (qr code reads VICTOR NM-II21B26):


Mainboard cabling (has absolutely no RFI filtering at all on the cables as other cheap inverters do):


Mppt part:


Does it seems familiar for anyone? I would love a schematic or service manual...

 

[anti77]

This is how the chart looks, cutting communication when solar goes above1600w usually around 12:15 and returns to normal when it drops below this power in the evening.


If there are clouds, I can see some data temporarily. Looks like RFI messing up the communication lines inside the machine. BTW., tested with laptop and RS232 converter, when the WIFI plug cuts out there is no reply to the laptop either. Will order some clip-on ferrites...

 

[meetyg]

I previously bought the Powmr branded version of this inverter. I didn't like it even from early testing. It made an audible electric "hum" (somewhat high pitched).

All round it seemed like a cheap unit. So I sold it. I don't know how it's doing at the buyer (I did help him with initial setup, but don't know how it's holding up).

So maybe that audible hum was due to inadequate filtering...

Glad I decided to ditch it.

 

[anti77]

@meetyg I know what you mean, I have the same hum but only when mains is switched on towards the inverter. Since this inverter is up and running I had to put all ham radio related stuff aside because of the RF noise. The inverter has run our entire home all summer, makes quite a lot of power, so it's worth its $200, I just wish I knew how much power it actually makes...

I've put clip-on ferrite that I have recovered from an old TV on the internal cable towards the comm board and the inverter output (230v) wires. Much better communication now, but still with cutouts when the solar power generation is at it's peak (theoretical maximum of 2640w, and fans run at max power):



Any idea where would a "normal" hybrid inverter have ferrite toroids internally?

 

[meetyg]

Any idea where would a "normal" hybrid inverter have ferrite toroids internally?

I'm not really sure, but recently I saw a YT of a Datouboss inverter, and the guy shows some ferrite rings on a few wires. He mentions that some other inverters don't have this.

In general this guy (VM on YT) has some really interesting videos, but they are either in Russian or Ukrainian (I don't know the difference...). But luckily you can apply translated subtitles to English.

Maybe his video will help you.