Victron energy MultiPlus-II Manual
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Victron energy MultiPlus-II Manual

Victron energy MultiPlus-II Manual

External transfer switch application
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ENGLISH
MultiPlus-II External Transfer
Switch application
Manual
Rev 03 - 03/2025
This manual is also available in HTML5.

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Summary of Contents for Victron energy MultiPlus-II

  • Page 1 ENGLISH MultiPlus-II External Transfer Switch application Manual Rev 03 - 03/2025 This manual is also available in HTML5.

  • Page 2: Table Of Contents

    MultiPlus-II External Transfer Switch application Table of Contents 1. Introduction ........................... 1 1.1. Advantages ........................1 1.2. Compatibility ......................... 1 1.3. Hardware requirements ..................... 1 1.4. Grid code certification country list ..................1 2. Functionality .......................... 3 2.1. Single line diagram ......................3 3.

  • Page 3: Introduction

    It removes the need to wire each unit's AC input and output terminals. • Reduce equipment costs: Combining MultiPlus-II 8, 10, or 15kVA units with an external transfer switch lifts their "no parallel" restriction. Otherwise, the more expensive Quattro 8, 10, or 15kVA units would have been required.
  • Page 4 MultiPlus-II External Transfer Switch application Country Certificate* Ziehl relay UFR1001E required Austria TOR Type A ver 1.3 Belgium C10/11 ed 2.3 Denmark TR3.3.1 Rev 5 Europe EN50549-1:2019 Germany VDE-AR-N 4105:2018:11 Northern Ireland G99 Issue 1 Amd 1 (Dec 2023) Poland PTPiREE Rev 1.2:2021...

  • Page 5: Functionality

    MultiPlus-II External Transfer Switch application 2. Functionality The external transfer switch replaces the internal AC transfer switch of each individual MultiPlus-II unit in the system. The system operates almost identically to one using the internal AC transfer switches. Features such as UPS functionality, AC input current limit, PowerControl, and PowerAssist remain active.

  • Page 6: Installation

    Before the system's initial power-up, double-check all wiring. Wiring mistakes can damage the MultiPlus-II units. 3.1. AC voltage measurement The MultiPlus-II's AC input functions as a measuring input. Since the internal back-feed relay is not used, the wires can be relatively thin, 1.5mm² wires are sufficient. Connection procedure: Connect the AC-IN terminals of MultiPlus-II to the AC supply.

  • Page 7: Ground Relay

    For more information, see: https://www.victronenergy.com/meters-and-sensors/current-transformer-for-multiplus-ii. 3.3. Ground relay The ground relay drive signal is supplied by the MultiPlus-II “Ext GND Relay” terminals of the L1 phase master unit via a help relay. Since the “Ext GND Relay” output signal is limited to 24V / 200mA, a help relay with a 24V coil must be used to switch the actual ground relay.

  • Page 8: Ziehl Relay

    MultiPlus-II External Transfer Switch application 3.5. Ziehl relay A Ziehl UFR1001E relay might be required for certain grid-connected countries or applications. The Grid code certification country list [1] section lists the requirements per country. Grid or generator K1, K2 transfer switch position feedback signals...

  • Page 9: Configuration

    Repeat the process for all MultiPlus-II units. CAUTION: Never use MultiPlus-II unit with standard firmware in an "External transfer switch" application. This will cause the system to connect to the AC input and likely trigger the current protection on that measurement- only circuit.

  • Page 10: Multiplus-Ii Configuration

    MultiPlus-II External Transfer Switch application 4.3. MultiPlus-II configuration Use "VEConfigure" to configure each MultiPlus-II unit. Configuration procedure: Ensure the “S99” firmware version is installed Navigate to the “General” tab. For all phase master units, set the "Current sensor rating" to 100 or 400A, matching the current sensor's current rating.

  • Page 11: Venus Os Version

    MultiPlus-II External Transfer Switch application 4.4. Venus OS version If a GX device is used, it should be updated to Venus OS version 3.33 or later. 4.5. GX device generator start/stop feature. If the system includes a generator, we recommend using the generator start/stop feature in our GX devices, including the cool-down function, to ensure a seamless transfer.

  • Page 12: Troubleshooting

    • This indicates a configuration fault. Verify that the current transformer (CT) rating matches the system capacity. For example, in a three-phase 12 x 48/15000 MultiPlus-II setup, this fault occurs if the configured CT rating is set to 100A. For such a system, a 400A CT rating is required.

  • Page 13: Wiring Diagrams

    MultiPlus-II External Transfer Switch application 6. Wiring diagrams 6.1. General wiring diagram Page 11 Wiring diagrams...

  • Page 14: Wiring Diagram With Added Ziehl Relay

    MultiPlus-II External Transfer Switch application 6.2. Wiring diagram with added Ziehl relay Page 12 Wiring diagrams...

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