Grid supply is 2 phase (120 degree). 2 x 48/8000/110 - 100/100. One on each of the 2 phases.
9.6kWpk on 2 x Delta Solivia 5.0 AC inverters (one per phase - old Grid Tie system) on AC Out of Quattros.
6.6kWpk Solar on 2 x 150/85 MPPTs DC Coupled.
Battery is 9 x BYD B-box LV 23kWhr
Latest firmware in everything. Quattro's are running the UK grid code and are feeding excess solar to the Grid.
I'm attempting to connect a 15kVA 3 phase backup generator to the ESS system and have connected two of the three phases to the ACIN1 of both Quattros. (The grid is connected to ACIN2). To balance the load on the generator I've connected the third leg to a Titan 48/50 battery charger. I had to disable LOM on the ACIN1 to get the generator to stay connected. It all works perfectly in regards to connecting and charging. I'm not concerned about the interaction between Gen/Quattros/AC Inverters as the generator won't be running when the sun is out anyway.
The problem I have is that the Quattros will not connect to the generator when the Grid is available on the ACIN2. It hooks up every time if I isolate the Grid.
I figured I could possibly rectify it with an Aux input/Assistants to "Ignore ACIN2" but it didn't work either.
As soon as the Generator is available on ACIN1 it diconnects the Grid on ACIN2 but won't connect to the generator. If I then isolate the Grid it hooks up and starts to charge. I can then reconnect the grid and the generator stays connected as it should. When I shut the generator down it disconnects and the grid reconnects on ACIN2 as it should.
I've read all I can find on the subject but can't find a solution.
Any help would be appreciated.