Victron with AC-coupled SolarEdge - no battery charging from PV

Good-day. We are running a 3-ph Victron system comprising 3 x Muliplus 5kW inverters together with a 1 x 3-ph SolarEdge SE-17k grid tie inverter. The system is basically working o.k. but I am not succeeding with maximum self-consumption. The energy produced by the SolarEdge successfully powers the household loads but never seems to charge the battery. The SolarEdge is connected on the load side of the Victron inverters, not the grid. It appears that the SolarEdge is throttling it’s output so that none of the energy produced feeds into the Victrons and then to charge the battery. We have connected the SolarEdge to the GX via RS-485 and it is seen and recognised. Does anyone know what the key checkpoints are for this setup ?