I am replacing Renogy batteries in my Sprinter camper van with Victron Smart batteries. I currently use a VS.Bus Smart dongle to remotely turn on and off my Multiplus via a Digital Multi Control.
With the Victron Smart batteries, I will install also a VE.Bus BMS V2 and Smart BatteryProtect BP-220.
Will I still need the VS.Bus Smart dongle, or should I connect my VE.Bus BMS V2 directly to my Multiplus? I still need a way to remotely turn on and off my Multiplus, and I prefer to do that via physical switch, i.e. not via app.
TL;DR: Position the BMS between the Digital Multi Control and the VS.Bus Smart dongle.
Answer is in the manual for the BMS. See section 3.6., Connecting a Digital Multi Control or a VE.Bus Smart dongle:
“A VE.Bus Smart dongle or Digital Multi Control (DMC) must be connected to the Remote panel port of the BMS. … In systems containing a Digital Multi Control and … a VE.Bus Smart dongle at the same time, on/off/ charger-only control of the inverter/charger is only possible via the Digital Multi Control. … The VE.Bus Smart dongle can be connected to the MultiPlus/Quattro port of the BMS for easy wiring.”