Multi RS

	To ensure a trouble free operation of the Multi RS, it must be used in locations that meet the following requirements:   a) Avoid any contact with water. Do not expose the product to rain or moisture. b) Install the Multi RS upright and vertical. Ensure 30cm clearance above and below it. c) The Multi RS must be installed on a non-flammable surface and the construction materials surrounding the installation should also be non-flammable. d) Do not place the unit in direct sunlight. Ambient air temperature should be between  -40°C and 60°C (humidity < 95% non-condensing).   e) Do not install the Multi RS in an environment where the air could be contaminated with particulate matter such as soot, dust or salt. For example conductive soot from the exhaust of a diesel generator could be drawn into the unit and cause short circuits inside it. f) Do not install the Multi RS where flammable or corrosive gases or vapours could come near the installation. g) Do not obstruct the airflow around the Multi RS. h) If the Multi RS is installed in an area used for general storage, ensure that no flammable materials such a cardboard boxes are stored close to the installation. Ensure that the end user is aware of these requirements.
	The Multi RS contains potentially dangerous voltages. It should only be installed under the supervision of a suitable qualified installer with the appropriate training, and subject to local requirements. Please contact Victron Energy for further information or necessary training.
	Excessively high ambient temperature will result in the following: ·        Reduced service life. ·        Reduced charging current. ·        Reduced peak capacity, or shutdown of the inverter. Never position the appliance directly above lead-acid batteries. The Multi RS is suitable for wall mounting. For mounting purposes, a hook and two holes are provided at the back of the casing. The Multi RS must be fitted vertically for optimal cooling.
	For safety purposes, the Multi RS should be installed in a heat-resistant environment. Any presence of e.g. chemicals, synthetic components, curtains or other textiles, etc., in the immediate vicinity should be prevented at all times.
	Never connect batteries directly to the Multi RS without adequate circuit protection. Always ensure that adequate circuit protection is installed between the batteries and the Multi RS.
	Batteries shall have a flammability class of HB or better.
	Each system requires a method of disconnecting the AC and DC circuits. If the overcurrent protection device is a circuit breaker, it can also serve as the disconnect switch. If fuses are used, separate disconnect switches are required between the source and the fuses.

Try and keep the distance between the product and the battery to a minimum in order to minimise cable voltage losses

First: Confirm correct battery polarity before connecting the battery cables.

Second:if required, connect the remote on-off, and programmable relay, and communications cables.

The illustration shows the front panel connectors with a description for each one in the table below.

In order to utilize the full capacity of the Multi RS, batteries with sufficient capacity and battery cables with sufficient cross section should be used. The use of undersized batteries or battery cables will lead to:

See table for MINIMUM battery and cable requirements.

	Always use a torque wrench with insulated box spanner in order to avoid shorting the battery and / or battery cables. Maximum torque: 14 Nm Avoid shorting the battery cables.
	Install a DC main switch and DC main fuse in the system and only place the DC main-fuse for the Multi RS after all necessary DC connections have been made.

To access the battery terminals, undo the two screws at the bottom of the enclosure and remove the cover to expose the wiring compartment.

The battery terminals for the Multi RS are located on the left-hand side of the wiring compartment. Remove the nut, spring washer, and flat washer before attaching the cable terminal lug. Warning The bottom nut is soldered to the PCB; do not attempt to loosen it.

It is important to place the terminal lug onto the stud first, followed by the flat washer, spring washer, and nut, in that order. Ensure that each nut is tightened to a maximum torque of 14 Nm.

The AC connection terminal blocks can be found on the right hand side of the wiring compartment.

The AC connector blocks are the screw clamp type.

This can be used to connect a PC/laptop to configure the inverter with a VE.Direct to USB accessory. Can also be used to connect a Victron GlobalLink 520 to allow for remote data monitoring.

The VE.Can ports can be used to connect to other devices, such as:

VE.Can terminators should always be installed in the devices at both ends of the VE.Can network.

Used to connect to the device via VictronConnect for configuration.

Note that this Bluetooth interface is not compatible with VE.Smart Networking (i.e Smart Battery Sense).

The user I/O terminal block is located on the left hand side inside the wiring compartment.

The terminal block can be removed to make connecting small wires easier. To release it, push both orange levers (top and bottom of the connector) to the left.

Connections are made by pushing the wire into the hole. In the "TOP" orientation, the wire can be released by pushing down the orange tab next to the hole with a small flat blade screwdriver.

The diagram below shows the pinout of the connector and the function of each pin. The functions are also printed on the side of the connector itself.

4.9.1. Remote H and L terminals

There are two terminals marked REMOTE_H and REMOTE_L.

The default function of these terminals is to switch the Multi RS on or off remotely.

Note

From the factory, these two terminals are connected together with a wire link. This enables the Multi RS to turn on when its main physical switch is on.

To use the terminals for remote connections, the wire link should be removed.

These two contacts can be configured for either remote on/off (default), or for 2-wire BMS mode.

When multiple units are combined in a system — for example in a three-phase setup — you can connect the contact wires to any single unit. The contact’s state is then shared with the rest of the system through the VE.Can connections.

You only need to configure the unit which has the contact wires connected to it.

Remote on/off functionality:

The factory fitted wire link can be removed and then wires can be connected to an external switch contact. The switch contact can then be used to switch the Multi RS on or off.

This is the default configuration in VictronConnect, no configuration changes are necessary on a new unit. The configuration can be checked in Remote mode in the Battery settings menu.Battery

The Multi RS will be switched on if the inputs are wired in one of the four ways pictured on the right. The factory wire link is in place, A closed switch contact is wired between REMOTE_H and REMOTE_L. REMOTE_H is wired to battery positive (+48V). REMOTE_L is wired to battery negative.

The Multi RS will be switched off if the inputs are wired in one of the four ways pictured on the right. The factory wire link is removed and REMOTE_H and REMOTE_L are open circuit. An open switch contact is wired between REMOTE_H and REMOTE_L meaning that they are open circuit. REMOTE_H is wired to battery negative. REMOTE_L is wired to battery positive (+48V).

2-wire BMS mode:

The REMOTE_H and REMOTE_L terminals can also be configured for interfacing with a 2-wire BMS. Two separate contacts on the BMS control whether the Multi RS is allowed to charge or discharge. This is configured in VictronConnect, see Remote mode in the Battery settings menu.Battery

• Change the mode from "Remote on/off" to "2-wire BMS".

The diagrams below demonstrate what mode the Multi RS will be in depending upon the state of the REMOTE_H and REMOTE_L terminals.

Note

In 2-wire BMS mode, if the REMOTE_H and REMOTE_L terminals are linked (and not connected to +48V), the Multi RS will be on, but charging will be disabled.

The BMS' "Allow to charge" and "Allow to discharge" contacts are both closed. The REMOTE_H and REMOTE_L terminals are both pulled up to +48V through the BMS switch contacts. The Multi RS operates normally, and is allowed to charge and discharge the battery.

The BMS has opened its "Allow to charge" contact. The REMOTE_H is pulled up to +48V through the BMS contact and REMOTE_L terminal is open circuit (floating). The Multi RS stops charging the battery from AC and/or solar sources, but continues to discharge the battery as normal.

The BMS has opened its "Allow to discharge" contact. The REMOTE_L is pulled up to +48V through the BMS contact and REMOTE_H terminal is open circuit (floating). The Multi RS stops discharging the battery, but continues to charge the battery from AC and/or solar sources if available.

The BMS' "Allow to charge" and "Allow to discharge" contacts are both open. The REMOTE_H and REMOTE_L terminals are both open circuit (floating). Neither charging nor discharging is allowed, so the Multi RS switches off.

4.9.2. Programmable relay

There is one general-purpose, potential free (dry) relay contact which can be configured for various functions.

Use the Relay menu in VictronConnect to configure it.Relay

The relay contacts are rated for 4A up to 35VDC and 1A at 70VDC.

Warning

Do not use the relay contact for any AC (230V) circuits.

In this example, the normally open relay contact is configured for starting and stopping a generator.

4.9.3. Voltage sense

To compensate for possible cable losses during charging, two sense wires can be connected directly to the battery or to the positive and negative distribution points. Use wire with a cross-section of 0,75mm². During battery charging, the charger will compensate the voltage drop over the DC cables up to a maximum of 1 Volt (i.e. 1V over the positive connection and 1V over the negative connection). If the voltage drop threatens to become larger than 1V, the charging current is limited in such a way that the voltage drop remains limited to 1V.

An example of the VSENSE+ and VSENSE- terminals connected to the battery terminals. A fuse close to the battery is recommended to protect the Voltage sense wires from any short circuits.

4.9.4. Temperature sensor

For temperature-compensated charging, the temperature sensor (supplied with the unit) can be connected. The sensor is isolated and must be fitted to the negative terminal of the battery. The temperature sensor can also be used for low temperature cut-off when charging lithium batteries. You can configure this in the Battery settings page in VictronConnect.Battery

The supplied battery temperature sensor is connected to the battery negative terminal. Note Only use the temperature sensor which is supplied with the Multi RS.

4.9.5. Auxiliary inputs

The Multi RS is equipped with 2 digital input ports, they are labelled AUX_IN1+ and AUX_IN2+ on the removable terminal block, with AUX_IN- being the common terminal for both.

An AUX_IN+ input is considered active when it is connected to AUX_IN-.

Warning

Do not connect any of the AUX_IN terminals to the battery positive or negative.

The diagram on the right shows AUX_IN1 as active.

The diagram on the right shows AUX_IN1 as inactive.

In VictronConnect, the Aux input settings page allows different functions to be configured.Aux Input

• Unused: The Aux input has no function.

• AC IN connect: The AC input can be connected or disconnected as needed. For example, you can disable the AC input during expensive peak periods of a time-of-use tariff. Either an active signal or an inactive signal can be used to set the AC input connected state.

• AC IN feed-in enable: In a grid parallel installation, the Aux input can be used to enable or disable grid feed-in. Either an active signal or an inactive signal can be used to set the feed-in state.

• Safety switch: The Multi RS only operates when the Aux input is active.

  This can be used to remotely switch off the Multi RS if the REMOTE_L and REMOTE_H terminals are configured for a 2-wire BMS.

  It could also be used as a separate safety switch signal from another system which needs its own input.

  Note

  If the REMOTE_L and REMOTE_H terminals are in a state that switches the Multi RS off, then this will override the Aux input Safety switch function, and it will remain off.

  For example, if the REMOTE_H and REMOTE_L terminals are open circuit, then the Multi RS will be switched off regardless of the state of the Aux input Safety switch

If the same function is assigned to both aux inputs then they will be treated as an AND function, so both will need to be active for the function to be recognized as active.

Note

Some grid codes require the auxiliary inputs to be used for charge power limiting or to prevent export. Any grid code functions will override functions defined in the Aux input settings and they will be greyed out.

The Multi RS has a tolerance for irregularities on the AC input like fast frequency changes or voltage changes to improve reliability when connecting to generators.

Using a generator with the Multi RS requires firmware version v1.11 or later.

Set the following option on the General settings page: Set the "AC input type" to "Generator". "Moderate generator load changes" should be switched on. Ensure that "Energy meter support" is switched off. Adjust the input current limit to suit the power output of the generator.

If no grid code is set then set the following on the Grid page: Check that the "Grid code" is "None". Switch the "UPS function" off. The 'UPS function' restricts the acceptance of an AC input to a very precise sine wave so that in the event of a fluctuation in the AC supply it is possible to maintain an apparent continuity of supply to the loads. This is incompatible with most generators and should be disabled when using a generator to improve reliable acceptance of the AC supply.

If a grid code is set then set the following two parameters on the Grid page: The AC Input 1 LOM detection should be set to "no LOM detection (not compliant)". Caution Do not disable LOM detection when the Multi RS is connected to the grid. This option is only to be used when a generator is connected at the AC input. Disable feed-in by switching the "Feed-in allowed" option off.

Ensure that the ESS mode is set to "Keep batteries charged".

The programmable relay contact of the Multi RS can be used to start and stop a generator. The setup is explained in the VictronConnect section.Relay

See Limitations chapter for additional charging power limitations.Limitations

An Energy Storage System (ESS) is a specific type of power system that uses the Multi RS to work in conjunction with a grid connection. It is used to optimise the use of solar power, battery storage and grid import or export.

ESS can be configured to optimize self-consumption or to keep batteries charged.

When there is more PV power than is required to run loads, the excess PV energy is stored in the battery. That stored energy is then used to power the loads at times when there is a shortage of PV power. When the battery is full, then the excess PV energy can be exported to the grid.

You can choose how much battery capacity you want to keep in reserve. If your grid connection is reliable, you can use more of the battery and keep less in reserve. Conversely, if your grid connection is unreliable and experiences frequent outages, you may prefer to keep more battery energy in reserve.

The “Keep batteries charged” option keeps the batteries fully charged whenever possible. The batteries will only discharge during a grid outage when solar power is insufficient. As soon as grid power returns or sufficient solar power is available, the batteries will recharge automatically.

The Multi RS can be configured as an Energy Storage System. In this setup, the device functions in grid-parallel mode, allowing energy to be sent back to the grid through the AC input terminals.

To feed into the grid, you must select the appropriate grid code for your country within VictronConnect. In most cases, permission from the grid operator will be required before configuring an Energy Storage System to feed in.

If you do not have permission from your grid operator or if the installation does not meet the requirements for grid feed-in, set the grid code to 'None.' In this case, energy will not be fed back into the grid.

Use VictronConnect to configure the Multi RS for ESS as shown on the following pages:

From the main settings page select the ESS settings page. ESS mode: Tapping the box will display a selection of ESS modes. For an energy storage system, one of the optimized modes is typically the best choice. In this example, "Optimized without battery life" may be most suitable for lithium battery chemistry. For more information on the other available ESS modes, visit the VictronConnect section.ESS Minimum discharge SOC: This setting determines the lowest point at which the battery will be discharged when the grid is available. If the grid goes offline, the battery may continue to discharge below this level in order to keep the AC output powered. Self-consumption from battery: You can choose whether the energy from the battery will power just the critical loads at the AC-out terminals or to also include loads positioned between a grid energy meter and the AC-in terminals. Note This option will only be visible if "Energy meter support" is enabled. See Connecting an external energy meter. Without a grid energy meter, ESS can only supply the critical loads with battery power.

Self-consumption from battery options: All system loads: ESS will use battery power to supply loads which are connected between a grid energy meter and the AC-in terminals, as well as critical loads connected to the AC-out terminals. Only critical loads: ESS will only supply battery power to the critical loads connected to the AC-out terminals. Loads connected between a grid energy meter and the AC-in terminals will be supplied by the grid and not from the battery.

Navigate to the Grid settings page, choose an appropriate grid code for your area, and select it. Depending on your selection, additional options may become available, which may vary by region. In this example, we will use Germany as the selected grid code. Certain settings will appear greyed out and cannot be modified without setting the grid code password. Beware not to alter these settings unless instructed by your grid operator. Grid code: Choose the country or region that corresponds to your installation's location. Important Always check that the Multi RS is certified for use in your country. The drop-down list does not imply certification. Check for certificates here. Specs Tapping 'Show' displays the details and requirements related to the selected grid code. Password: Installers have the ability to make additional changes and alter the grid code region by entering the password, but it's essential that you only modify settings as directed by your grid operator. Loss of mains detection: Most of these settings are typically greyed out and are intended for informational purposes only. The values are defined by the selected grid code. Use Aux1 as disable FeedIn signal: A grid operator may require a means to disable feed-in. To accommodate this requirement, installers can wire a contact to Aux1 of the Multi RS to disable feed-in as needed. Use Aux 2 as limit charger signal: When using the Germany grid code, there might be a requirement from the grid operator to limit the charging power to 4.2kW divided evenly over the number of units. To meet this requirement, you can wire a contact to Aux2. NS Protection log: The network system protection log records the five most recent protection events. Tap "Show" to view any logged events. Feed-in configuration. Feed-in allowed: This feature is designed to enable or disable excess energy flow into the grid, depending on your location's specific requirements. By default, it is set to 'on' (energy can be fed in), but if feed-in is not allowed, it should be toggled off. Limit system feed-in: If you have a limit on the amount of energy that can be fed back into the grid, use this feature to set the maximum allowed feed-in power. Maximum feed-in: Set a maximum limit for the amount of energy that can be fed back into the grid through the Multi RS. Feed-in not active: Use this feature for diagnostic purposes when you notice that energy is not being fed back into the grid. Tapping the 'Check reason' button will display a list of potential reasons for the problem.

If the grid code requires external control of charging power or to disable grid feed-in, the contacts can be wired to the Aux_IN terminals of the User I/O connector. Three-phase systems require contact wiring to only one unit’s I/O connector. The contact state is then shared with and replicated by all other units in the system. Note Not all grid codes support the use of Aux inputs. As an example, for the German grid code, the Aux_IN terminals are used as below: Contact A is wired to Aux_IN1+. When the external contact is closed, grid feed-in will be disabled. Contact B is wired to Aux_IN2+. When the external contact is closed, the charging power from the grid will be limited to 4.2kW.

The Multi RS includes a built in AC PV inverter detection system. When there is a feedback of AC PV (a surplus) from the AC-out connection port, the Multi RS will automatically enable an AC output frequency adjustment.

While no further configuration is required, it is important that the AC PV inverter is configured correctly to respond to the frequency adjustment by reducing its output.

Note the 1:1 rule of AC PV inverter size to Multi RS size, and minimum battery sizing applies. More information about these limitations are available in the AC Coupling manual, and this document is required reading if using an AC PV inverter.

The frequency adjustment range is not configurable, and includes a built in safety margin. Once the absorption voltage is reached, the frequency will increase. So it is still essential to include a DC PV component in the system for complete battery charging (i.e. float stage).

The PV inverter stop frequency (f_stop) is 53.2Hz. This is not configurable.

It may be possible to adjust the power output response to various frequencies on your AC PV inverter.

The default configuration has been tested and works reliably with the Fronius MG50/60 grid code configuration.

The Victron VM-3P75CT energy meter can be used with the Multi RS.

The Victron energy meter can be connected using either VE.Can or Ethernet. A GX device is required for Ethernet connectivity. See example diagrams below.

See the VM-3P75CT manual for full details.

The energy meter can be configured for single phase or three phase systems.

Once the role is selected in the energy meter settings, then energy meter support can be set in the Multi RS settings:

Energy meter support: Toggle this switch on to enable a grid energy meter to be used in this system. This will allow loads between the grid energy meter and the AC-input terminals of the Multi RS to be supplied by the Multi RS. Note The energy meter role needs to be configured as a "Grid" meter. AC current limit at energy meter: This value will set the maximum current limit at the point that the energy meter is installed. Loads between the energy meter and the Multi RS will be supplied by the grid until the set limit is reached. After this, the Multi RS will begin to "power assist" in order to maintain the set current limit. Current limit at AC input: This setting determines the maximum current allowed at the AC input terminals of the Multi RS. It limits the AC current for loads on AC out 1 and battery charging. Loads on AC Out 1 will continue to be supplied by the AC input, but if the current limit is reached, the Multi RS begins to "power-assist" using energy from the battery. Current limit overruled by remote: Enable this option to allow the current limit to be adjusted remotely. For example, a GX device can be used to adjust the current limit remotely. It is not possible to remotely set the current limit any higher than the level defined here.

The above wiring example can be used when the energy meter role is set up as "Grid meter" or "Generator". The incoming current from the AC grid or a generator is measured before the AC input of the Multi RS, or any non-critical AC loads.

If "Energy meter support" is enabled, a current limit can be set at the energy meter to prevent excessive load on a weak AC grid. If the non-critical loads exceed the current limit at the energy meter then the Multi RS will begin to "power assist" to try and maintain the current limit at or below the set point.

If a generic PV inverter is connected to the AC output of the Multi RS the energy meter role should be set to "PV Inverter" and wired to measure the current produced by the PV inverter.

When the energy meter role is set to "AC load" then the energy meter can be wired to measure specific loads. For example, a water heater circuit could be measured to monitor its power consumption and also track the amount of energy it uses.

If you are new to Victron, please start with small system 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.

Victron is able to provide specific training for these systems to distributors via their regional sales manager.

Mixing different models of Inverter RS (ie. the model with Solar and without Solar) is possible. However mixing Inverter RS with Multi RS is not currently supported.

DC and AC wiring

Each unit needs to be fused individually on the AC and DC side. Make sure to use the same type of fuse on each unit.

The complete system must be wired to a single battery bank. We do not currently support multiple different battery banks for one connected 3 phase system.

Communication wiring

All units must be daisy chained with a VE.Can cable (RJ45 cat5, cat5e, or cat6). The sequence for this is not important.

Terminators must be used at either ends of the VE.Can network.

The temperature sensor can be wired to any unit in the system. For a large battery bank it is possible to wire multiple temperature sensors. The system will use the one with the highest temperature to determine the temperature compensation.

Programming

All settings need to be set manually by changing the settings in each device, one by one. For now synchronising settings to all devices is not supported by VictronConnect.

There is a partial exception to this - changing the AC output voltage will temporarily be pushed to other synchronised devices (to prevent undesired power flow imbalance via the AC output). However this is not a permanent settings change and still needs to be manually set on all devices if you wish to change the AC output voltage.

Charger settings (voltage and current limits) are overridden if DVCC is configured and if a BMS connected via the BMS-Can port is active in the system.

System Monitoring

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.

The Multi RS supports single phase, and three phase configurations. It does not currently support split phase.

The factory default is for stand alone, single unit operation.

If you wish to program for three phase operation, it requires 3 units.

The maximum supported system size is 3 units in total, with a single unit on each phase.

All units must be connected to each other via VE.Can connections, with a VE.Can terminator at the start and the end of the bus.

Once the units are connected to the battery and via VE.Can they will need to be configured.

Delta configurations not supported

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 to 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.

In order to configure a 3 phase system the Multi RS will need to be correctly installed, and running firmware version v1.13 or later.3 phase installation

Configuring a system for three phase or single phase is done in VictronConnect in the System menu.

System configuration: The factory default System configuration setting is "Standalone". Tap the box to bring up a popup menu where you can select "Three phase". There are two three phase options to choose from, either clockwise or counter clockwise, depending upon the phase rotation at the installation site. You'll need to apply these same settings to each unit individually.

Phase selection: Select the correct phase that each particular unit is connected to. There can only be one unit per phase. Do this for each individual unit. It is also advisable to physically label each unit and also give a matching custom name in the product info settings.

System instance: Units with the same instance number work together on the AC side. Changing the System instance setting allows multiple groups of Inverters to be on the same VE.Can bus, but not synchronised, and segmented into different AC outputs, without interference. Continue with the same programming settings on the rest of the units. System settings sync: This option allows synchronization of certain settings amongst units in the system. There is more to find out about it here.System Prevent CAN network islanding: This setting determines what the system does in case of a broken CAN connection between the RS units, and enables the "Number of inverters in the system" setting below. Default is enabled. If three RS units are configured in three phase, each individual unit will only continue to work if it sees at least one other unit. This feature is only relevant in combination with the "Continue with missing phase" feature. Number of inverters in the system: Enter the total number of RS units installed in the system. This should be set to 3 for a 3 phase RS system. In case a CAN connection is broken between two units the network is split into segments, this setting is used to determine the largest and shut down the smaller segment to prevent them from continuing on their own unsynchronised. Note that setting the option "Continue with missing phase" to disabled, overrules this behaviour in such a way that it always ensures that all three phases must be powered at all times. So a broken CAN connection in a 3 phase setup will shut down all units. Minimum number of inverters to start: Choose the minimum number of inverters that must be present per phase when starting the system. In case a CAN connection is broken between two units the network is split into segments, this setting is used to determine the largest and shut down the smaller segment to prevent them from continuing on their own unsynchronised. Setting this to 3 means that all 3 units in a 3 phase Multi RS system must be present to start. If the “Continue with missing phase” option is also enabled, once the system is operational it will not shutdown if the number of inverters operational per phase drops below this figure (as long as the remaining inverters can power the load). Continue with missing phase: It is possible to configure the system so that if one unit is offline (for example due to it being physically switched off or a firmware update in case there is no grid connection to allow pass-thru), the other units can continue to operate and provide AC output power to their respective phases. By default, the 'continue with missing phase' is disabled. Switching one unit off with the physical switch will make that unit switch off. If the unit is one of three units that are in three phase, then the others will also turn off as well. If configured with 'Continue with missing phase' enabled, and minimum number of units is sufficient, then output to the other phases will continue even though its down to less phases than configured. The 'Continue with missing phase' configuration option SHOULD NOT be enabled if there are specific three phase loads connected that require all three synchronised phases to operate (such as a three phase electric motor). In that situation maintain the default 'disabled' setting for "Continue with missing phase". Caution Attempting to run a three phase load with only two phases operating could result in damage to your appliance. Caution If you have configured the system to continue to operate with a missing phase, and there is an issue with the VE.Can communications between the units (such as the wire being damaged), then the units will continue to operate, but will not be synchronising their output wave forms. Switch phases as group: Disabling this option will allow the system to continue working even if one or two phases from the AC input are missing. The system will continue to produce three phase output from the AC-Out terminals. This can also be used if a three phase output is required, but there is only one phase available from the grid or generator.

Note on redundancy and continuous output during firmware updates

A three phase system can be firmware updated without losing power on the AC output.

Make sure that there is stable AC input available when starting the update and the unit currently being updated will switch to AC-passthrough mode.

The AC synchronisation mechanism used for 3 phase has a 'protocol' version embedded.

Units can work together even with different firmware versions, as long as they are running the same protocol version.

This allows for continuous uninterrupted supply even when updating firmware, as the units will individually update one at a time, while others continue to synchronise and provide the stable AC output.

If Victron needs to change the 'protocol' version number, it will be clearly noted in the firmware change log. Always read this before updating.

In the event that there are multiple protocol versions running on the same VE.Can bus, all units will indicate error #71 until they are all updated to the same version.

Known Issues