This manual explains the details of designing, installing and configuring three-phase and parallel systems. It applies to components that use VE.Bus, for example MultiPlus, Quattro and some larger Phoenix inverters.
Parallel and Multiphase systems are complex. We do not support or recommend that untrained and/or inexperienced installers work on these size systems.
Victron is able to provide specific training for these systems to distributors via their regional sales manager. There is advanced training theory and practical videos and competency exams for 3 phase and parallel installation and commissioning available on Victron Professional -> Online Training. You will require an installer account on Victron Professional to access it.
These should all be considered essential before attempting design or installation.
First get experience with smaller systems. If you are new to Victron, please start with simpler designs, so that you become familiar with the necessary training, equipment and software required.
It is also recommended to hire an installer that has experience with these more complex Victron systems, for both the design and the commissioning.
Three phase systems
Using our 15kVA Quattros, the maximum system size is a 180kVA three phase system. Which then consists of four units on each of the three phases: 12 units in total.
When using smaller models, there is a maximum of five units in parallel, on each of the three phases: 15 units in total. For example, using 10kVA Quattros, the maximum system size is a 150kVA three phase system.
Single phase systems
This is the same as above, but then per phase:
The VE.Bus cluster maintains a single 'global' status for SoC, DC voltage, and DC current. Every DC connection (on every Multi/Quattro and on every battery) has to be connected together to a single DC bus. Do not build systems with separated batteries on multiple (separated) DC bus structures connected to subsets of the Multi/Quattro units in the cluster. This will not work.
Also beware of sizing the battery cable and jumpers between cells/batteries.
For units in parallel: Both the DC and AC wiring needs to be symmetrical per phase: use the same length, type and cross-section to every unit in the phase. To make this easy, use a bus-bar or power-post before and after the inverter/chargers. Also, apply the same torque on all connections.
With regards to AC fusing, each unit needs to be fused individually. Make sure to use the same type of fuse on each unit due to same resistance. Consider using mechanically connected fuses.
With regards to DC fusing, each unit needs to be fused individually. Make sure to use the same type of fuse on each unit due to same resistance.
For both AC and DC fusing and protection, consult the product manual for details and recommended ratings.
Beware of phase rotation between the inverter and AC in. When wired in a rotation that is different to the programming of the Multis, the system will not accept the mains input and only operates in inverter mode. If a GX device is connected, it will signal a phase rotation alarm. In that case swap two phases to correct it, or re-program the units to match the wiring rotation.
Note: Do not over-dimension the AC cabling. Using extra thick cabling has negative side effects.
For units in 3 phase configuration: Our products have been designed for a star (Y) type three phase configuration. In a star configuration all neutrals are connected, a so called: “distributed neutral”. We do not support a delta (Δ) configuration. A delta configuration does not have a distributed neutral and will lead to certain inverter features not operating as expected.
VE.Bus is not isolated on the MultiPlus range and Quattros.
Therefore it is very important to prevent damage to the communications cards that the negative battery terminal of a Quattro remains continuous between units as long as the VE.Bus cable that connects the multiple units is connected.
If units need to be isolated at both poles, or local wiring requirements demand double pole isolation for each unit, the communications cables must be removed first AND appropriate safety signage needs to clearly explain this.
Double pole isolation of the system is allowed (and sometimes required), as long as it at the battery connection end of the DC bus, and the Multis/Quattros remain with continuous negative between themselves.
Wiring is further explained here:
Note: Special considerations exist before initial power-up for large systems using Redflow batteries: Click here for details.
In the VE Configuration tools there are two different programs. One to configure small systems and one for larger systems:
Activate VEConfigure from within these programs to make settings per unit. Right click, and select VEConfigure.
Make the following settings in the master of L1:
The following settings need to be made in the master of each phase:
The following settings need to made in each unit in the system:
Charger settings (voltage and current limits) are overridden if DVCC is configured and if a CANBus BMS is active in the system.
A quick way to make settings in all units is the 'send to all units' feature. You'll see the option after making the changes to the first unit.
Note that AES is only operational in stand-alone systems. Not in parallel and multi-phase systems.
A unique virtual switch configuration can be configured for each unit in the system. With the exception of the Ignore AC input function: configure that in the master of L1.
Assistants can be used to expand the potential configuration options of your system, and are required in some installation types. When using assistants with multiple units, some assistants are required to be loaded onto all units in the system individually, and some assistants are able to be just loaded onto some or one of the units.
With all the other Assistants: genset start/stop, relay locker etcetera, a unique configuration can be made in each unit.
It is strongly recommended that a GX Family Product is used in conjunction with these larger systems. They provide highly valuable information on the history and performance of the system. System notifications are clearly presented and many additional functions are enabled. Data from VRM will greatly speed support if it is required.
There is an advanced training video and competency exam for 3 phase and parallel installation and commissioning available on Victron Professional -> Online Training. You will require an installer account on Victron Professional to access it.