Hi thgoebel, I need more help.
Still struggling. My Shelly Pro 1 in front of Shelly Pro 1PM handles 3-phase (for water pump), but Pro 1PM (for heat pump) should handle 1-phase and measure consumption.
Right now after installation I find that Pro 1 works OK, but Pro 1PM only shows 1.4w. However, it appears that the Pro 1PM must be on for the heat pump to get power. I believe that only one of the 3 phases is passed through Pro 1PM.
My electrician is also stuck.
Does there have to be an extra contactor or similar that brings together two of the phases from the 3-phase for this to work?