[alin23]

It sounds very likely that this might be electromagnetic interference. The good part is that it’s easy to troubleshoot, just move the generator (or the monitor, whichever is lighter) far away, like in another room or outside.

You can also try a different, thicker cable, if you have one handy. The thicker cables are usually better shielded by having a sheath of tiny wires to catch that interference and conduct it to ground.

[mhasbini]

I just tested moving the ecoflow to another room (both door closed ~5m between the ecloflow and the monitor) and used an extension cable to power the monitor.

The issue is still happening.

Unfortunately I don't have a different HDMI cable at hand now. I'll test another cable as soon as I get my hands on one.