Hi, I have 3-phase off grid with 3x Multiplus 15k supported by 80kWh of BYD LVS and 40kW solar through multiple MPPTs. All works great. I want to extend to use the 3-phase as ACIN to 3 more MP15k with ac- coupled solar on the output and more BYD LVS as battery. I'm sure this is all good too. But, here's the twist, I want also charge the new batteries from an ac source. The plan is to add another MP15k just to charge the 2nd set. Problem is, the BYD BMS is connected to the 2nd Cerbo controlling the 2nd set of MP15k. So how to control the charging? I am thinking it's OK to use a BNV and shunt, just for the charger. And maybe take a switch off command from the Cerbo at 90% SOC. Bit is there a smarter way to do this? If the charger was a MPPT it would work easily enough, but because it's a MP2 I don't think the carbon can recognise it as a charger. Any good ideas?