I have two multiplus 3kw 120V running as a 120/240V pair. I have an ATS on the input of the first multi switching L1 between a 120V source and a 120/240V generator. L2 from the gen goes straight to the second multi.
I have done this before without issues but this one is giving me a hard time. The customer has 240V loads, and the 7kW Honda generator suitable for the task. Often the generator can't be used and there is only a 120V source. The first multi passes through the shore and charges while the second creates the other phase.
To do this I uncheck "switch as group" in the system config. It works, and operates as expected on the single 120V input. The issue is it won't reliably switch to the generator, and when it does, it is eager to switch back to invert. Sometimes when it tries to switch, the generator triggers an overload, with only about 25% load.
If I turn on "switch as group", almost the moment I press send it switches to generator and I can pull full amps. Obviously though, with switch as group enabled, I can't make use of the shore power (because it needs to see the other phase).
I suppose this could be due to the delay in the ats. The generator applies it's L2 to multi 2, at the same time it applies it to the ats. multi 2 switches to gen before the ats has picked up L1, so load is applied to only one phase of the generator.
Any advice?
