Hello. 2 quastions… but i think its like 1 quastion 
can i connect MG batteries with RJ45 can straight to EasySolar-II GX?and do i need MG MASTER LV in between them… ?
And do i really need mg master lv in between to victron equipment? Does victron smart bms. Or another bms cant be used?
I think … YES
@APG ,
Definitively yes… The canbus network between the batteries and MG master is a propriatary network. Nothing but mg batteries, anMG Master or an MG display can be connected to that network.
Connection to the Victron GX device must be done through the Master Auxiliary canbus port. This port is configured as a NMEA2000 canbus port that must be cnnected to VE.can port.
On the power side use of the MG master is Mandatory. All the safety functions are built into the MG master.