Strange noises coming from the Multiplus. Parallel system currently in pass through with a load of approximately 400 watts. Short video.
sudden chagne in hum is either load with bad powerfactor,or electric company sending signals to big loads(217hz in czech republic,called HDO -mass remote control)…and i really hate it,if messes up multiplus for the moment
I don’t think it’s a load in the house. You may be right with the signals sent by electric company because as they start after a certain amount of time they disappear. I witnessed something like that some time ago.