For anyone not familiar with RV shore power (at least in the US/Canada), there are two options - 30 amp and 50 amp. 30 amp is entirely straightforward - 2 wires plus ground, 120V 30A across the two wires. 50 amp should really be called “100 amp” because it is three wires plus ground, so there are two “legs” with 120V 50A across each leg (100A total). You could run 240V appliances across the two hot wires, but there are no 240V appliances in my RV, so each leg originally attached to 1/2 of a split breaker panel, with half the appliances on each leg.
When I added the batteries/solar/inverters, etc, I installed two MultiPlus 24/3000/70 inverter/chargers, one attached to each shore power AC input leg. I then attached the AC output of each MultiPlus to 1/2 of the split breaker panel. So even though I have two Multiplus units, their outputs are not connected to each other. I.e., it is neither a split phase nor parallel installation. The only connection between them is the connection to the battery bank.
I now wish to add a DMC 200 control panel so I can quickly adjust the input power limit when I attach to a generator or 30 amp shore power. In both cases, a dogbone connector sends the single phase 30A power to both legs of the 50A shore power connector, so I need to set the MultiPlus input power limit to 15A each to avoid overloading the generator or popping the shore power breaker.
(finally) My question is: Can I connect the two MultiPlus units together (master/slave) via RJ45 and then attached a single DMC 200 to the master even though they are not connected in a parallel or split-phase configuration? Put another way, is it OK to connect the two MultiPluses with RJ45, even though their AC outputs are not connected together?