Wiring diagram
AC
input
(See full size diagrams in the appendix)
Configuration
Install S99 VE.Bus firmware
The external transfer switch application requires special VE.Bus firmware, identified by the ".S99"
subversion number.
Download the xxxyy.S99.vff file from
https://professional.victronenergy.com/
Install it using VEFlash, the VictronConnect app, or via the VRM Portal. Make sure to select the
xxxyy.S99.vff file.
Note: never update or upgrade systems with "External transfer switch" firmware using standard
VE.Bus firmware, as this will cause the system to connect to the AC input and likely trigger the
current protection on that measurement-only circuit.
VE.Bus System Configurator
Use the "VE.Bus System Configurator" to set up the system. Configure all phase masters in AC
input group 1 and all slaves in AC input group 2, as illustrated in the following screenshots.
Need help?
Do you have a question about the MultiPlus-II and is the answer not in the manual?