Introduction; Requirements And Compatibility; Additional Hardware Requirements - Victron energy MultiPlus-II Manual

Introduction

This manual explains how to install and configure a system using an external contactor (transfer
switch) instead of the Multiplus-II built-in relays.
Using an external transfer switch reduces wiring costs and installation time.
This solution is intended for generator-based systems only and cannot be used with grid-tied
systems as it is not certified for such use.

Requirements and compatibility

Compatible with all MultiPlus-II models rated 5000VA and above.
•
• Maximum number of units is 12, 4 per phase. Maximum systems size is this 180kVA.
Only one AC input source is supported
•
• Current transformer and contactor rating of 100A or 400A.
• Requires application-specific VE.Bus firmware, version S99.

Additional hardware requirements

1. High current 4 pole contactor: The external transfer switch.
2. Ground relay: High current single pole relay.
3. Relay Rated for 230V with 24V Coil: A relay with these specifications is necessary for
controlling the ground relay. The 24V coil allows it to be activated by the lower voltage
control circuit inside the MultiPlus-II.
4. Victron Current Transformer: This component measures the current in a circuit and is
essential for monitoring and managing power usage accurately.
5. 1.5 mm² wire and four-pole circuit breaker: This ensures that the whole circuit is
protected.
See the installation chapter for details.