Victron energy EasySolar-II GX User manual

EasySolar-II GX - Product
Manual
24/3000/70-32, 48/3000/35-32, 48/5000/70-50
Rev. 08 03/2021
ENGLISH

Table of Contents
1. Introduction ........................................................................................................................... 1
2. Safe Installation ...................................................................................................................... 2
2.1. Transport and storage ...................................................................................................... 2
2.2. Grounding .................................................................................................................... 2
3. Product Description ................................................................................................................. 3
3.1. Features applying to all applications ...................................................................................... 3
3.1.1. GX LCD display ................................................................................................... 3
3.1.2. BMS-Can Connections ........................................................................................... 3
3.1.3. Ethernet and WiFi ................................................................................................. 3
3.1.4. Automatic and uninterruptible switching ........................................................................ 3
3.1.5. Two AC outputs .................................................................................................... 3
3.1.6. Three phase capability ............................................................................................ 3
3.1.7. PowerControl – maximum use of limited AC power ........................................................... 3
3.1.8. PowerAssist – Extended use of generator or shore current .................................................. 3
3.1.9. Programmable ..................................................................................................... 3
3.1.10. Programmable relay ............................................................................................. 3
3.1.11. External current transformer (option) .......................................................................... 4
3.1.12. Programmable analog/digital input/output ports (Aux in 1 and Aux in 2, see appendix) ................. 4
3.2. Features specific on-grid and off-grid systems combined with PV ..................................................... 4
3.2.1. External current transformer (optional) ......................................................................... 4
3.2.2. Frequency shift .................................................................................................... 4
3.2.3. Built-in Battery Monitor ........................................................................................... 4
3.2.4. Autonomous operation when the grid fails ..................................................................... 4
3.3. Battery charger .............................................................................................................. 4
3.3.1. Lead-acid batteries ................................................................................................ 4
3.3.2. Li-ion batteries ..................................................................................................... 5
3.3.3. Other Li-ion batteries ............................................................................................. 5
3.3.4. More on batteries and battery charging ......................................................................... 5
3.4. ESS – Energy Storage Systems: feeding energy back into the grid ................................................... 5
4. Operation .............................................................................................................................. 7
4.1. On/Off/Charger Only Switch ................................................................................................ 7
5. GX LCD Interface ..................................................................................................................... 8
5.1. On/off behaviour ............................................................................................................. 8
5.2. Push button behaviour ...................................................................................................... 8
5.3. Information displayed ....................................................................................................... 8
5.4. Error Code Display .......................................................................................................... 8
6. PV array design ....................................................................................................................... 9
6.1. Sizing the array .............................................................................................................. 9
7. Accessing Connection Points ................................................................................................... 10
8. Installation ........................................................................................................................... 11
8.1. Location .................................................................................................................... 11
8.2. Connection of battery cables ............................................................................................. 11
8.3. Battery Connection Procedure ........................................................................................... 11
8.4. Connection of the PV array ............................................................................................... 12
8.5. Connection of the AC cabling ............................................................................................ 13
8.6. Optional Connections ..................................................................................................... 13
8.6.1. Remote Control .................................................................................................. 14
8.6.2. Programmable relay ............................................................................................ 14
8.6.3. Programmable analog/digital input/output ports ............................................................. 14
8.6.4. Voltage sense (connection terminal J, see Appendix A) .................................................... 14
8.6.5. Temperature sensor (connection terminal J, see Appendix A) ............................................. 14
8.6.6. Parallel Connection ............................................................................................. 14
8.6.7. Three-phase operation ......................................................................................... 14
EasySolar-II GX - Product Manual

8.6.8. Connection to the VRM Portal ................................................................................. 15
8.7. GX - How to update firmware ............................................................................................ 15
8.7.1. Changelog ....................................................................................................... 15
8.7.2. Via internet or with microSD-card/USB-stick ................................................................. 15
8.7.3. Direct download from the internet ............................................................................. 15
8.7.4. MicroSD-card or USB-stick .................................................................................... 15
9. Configuration ....................................................................................................................... 17
9.1. Standard settings: ready for use ......................................................................................... 17
9.2. Explanation of settings .................................................................................................... 18
9.2.1. Equalisation ...................................................................................................... 19
9.3. Inverter/Charger ........................................................................................................... 20
9.4. SmartSolar MPPT 250/70 charge controller ............................................................................ 20
10. Maintenance ....................................................................................................................... 21
11. Error Indications .................................................................................................................. 22
11.1. General error indications ................................................................................................ 22
11.2. VE.Bus error codes ...................................................................................................... 23
12. Technical Specifications ........................................................................................................ 25
12.1. Inverter/Charger .......................................................................................................... 25
12.2. SmartSolar MPPT Charge Controller .................................................................................. 25
12.3. General .................................................................................................................... 26
12.4. GX Device ................................................................................................................ 26
13. Internal Topography .............................................................................................................. 28
14. Appendix ........................................................................................................................... 30
14.1. Appendix A: Connection Overview ..................................................................................... 30
14.2. Appendix B: Block Diagram ............................................................................................. 31
14.3. Appendix C: Parallel Connections ..................................................................................... 32
14.4. Appendix D: Three Phase Connections ............................................................................... 32
14.5. Appendix E: Charge Characteristic .................................................................................... 33
14.5.1. 4-stage charging: .............................................................................................. 33
14.5.2. Battery Safe .................................................................................................... 33
14.5.3. Absorption ...................................................................................................... 33
14.5.4. Float ............................................................................................................. 33
14.5.5. Storage .......................................................................................................... 33
14.6. Appendix F: Temperature Compensation ............................................................................. 34
14.7. Appendix G: Dimensions ................................................................................................ 34
EasySolar-II GX - Product Manual

1. Introduction
The Victron EasySolar-II GX integrates the following elements:
• A powerful MultiPlus-II inverter/charger
• A SmartSolar MPPT solar charge controller
• A GX device with a 2x 16 character display
These elements come prewired, and preconfigured together inside a
single unit. This greatly simplifies most installations, saving time and
money.
This document explains how all components fit together, how to install
the product, and what documentation to use for configuration and other
details of its individual parts.
This document explains:
• Features
• Behaviour
• Specifications
• Limitations
• Installation instructions
• Troubleshooting steps
You must read it to understand how to use your product safely and
reliably.
This manual applies to:
• EasySolar-II GX 24/3000/70-32
• EasySolar-II GX 48/3000/35-32
• EasySolar-II GX 48/5000/70-50
EasySolar-II GX - Product Manual
Page 1 Introduction

2. Safe Installation
Please read the documentation supplied with this product first, so that you are familiar with the safety signs and directions before
using the product. This product is designed and tested in accordance with international standards. The product should be used for
the designated application only.
DANGER OF ELECTRICAL SHOCK
The product is used in combination with a permanent energy source (battery). Even if the product is switched off, a dangerous
electrical voltage can occur at the input and/or output terminals. Always switch the AC power off and disconnect the battery before
performing maintenance.
The product contains no internal user-serviceable parts. Do not remove the front panel and do not put the product into operation
unless all panels are fitted. All maintenance should be performed by qualified personnel.
Never use the product at sites where gas or dust explosions could occur. Refer to the specifications provided by the manufacturer
of the battery to ensure that the battery is suitable for use with this product. The battery manufacturer's safety instructions should
always be observed.
This product is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or lack
of experience and knowledge, unless they have been given supervision or instruction concerning use of the product by a person
responsible for their safety. Children should be supervised to ensure that they do not play with the product.
Do not lift heavy objects unassisted
2.1. Transport and storage
On storage or transport of the product, ensure that the mains supply and battery leads are disconnected.
No liability can be accepted for damage in transit if the equipment is not transported in its original packaging.
Store the product in a dry environment; the storage temperature should range from –20°C to 60°C.
Refer to the battery manufacturer's manual for information on transport, storage, charging, recharging and disposal of the battery.
Protect the solar modules from incident light during installation, e.g. cover them.
Never touch uninsulated cable ends.
Use only insulated tools.
2.2. Grounding
Battery grounding: this device can be installed in a positive or negative grounded system.
Note: apply a single ground connection (preferably close to the battery) to prevent malfunctioning of the system.
• Chassis grounding: A separate earth path for the chassis ground is permitted because it is isolated from the positive and
negative terminal.
• The USA National Electrical Code (NEC) requires the use of an external ground fault protection device (GFPD). These MPPT
chargers do not have internal ground fault protection. The system electrical negative should be bonded through a GFPD to
earth ground at one (and only one) location.
• The charger must not be connected with grounded PV arrays. (one ground connection only)
• The positive and negative of the PV array should not be grounded. Ground the frame of the PV panels to reduce the impact of
lightning.
**WHEN A GROUND FAULT IS INDICATED, BATTERY TERMINALS AND CONNECTED CIRCUITS MAY BE
UNGROUNDED AND HAZARDOUS.
EasySolar-II GX - Product Manual
Page 2 Safe Installation

3. Product Description
The basis of the product is an extremely powerful sine inverter, battery charger and transfer switch in a compact casing. It is
suited for use in Marine, Automotive, as well as stationary land-based applications.
3.1. Features applying to all applications
3.1.1. GX LCD display
A backlit 2 x 16 character display screen shows system parameters.
3.1.2. BMS-Can Connections
The BMS-Can connection allows connecting of compatible 500 kbps CAN-bus BMS batteries. VE.Can products as for example
Victron MPPT Solar Chargers, or a Lynx Shunt VE.Can are NOT supported.
3.1.3. Ethernet and WiFi
Ethernet and WiFi connections allow for local and remote system monitoring, as well as connection to Victron's free VRM portal
for long term system performance information.
3.1.4. Automatic and uninterruptible switching
Houses or buildings with solar panels or a combined micro-scale heating and power plant or other sustainable energy sources
have a potential autonomous energy supply which can be used for powering essential equipment (central heating pumps,
refrigerators, deep freeze units, Internet connections, etc.) during a power failure. A problem is however that grid connected
sustainable energy sources drop out as soon as the grid fails. With the product and batteries, this problem can be solved: the
product can replace the grid during a power failure. When the sustainable energy sources produce more power than needed,
the product will use the surplus to charge the batteries; in the event of a shortfall, the product will supply additional power from the
battery.
3.1.5. Two AC outputs
Besides the usual uninterruptible output (AC-out-1), an auxiliary output (AC-out-2) is available that disconnects its load in the
event of battery operation. Example: an electric boiler that is allowed to operate only if the genset is running or shore power is
available. There are several applications for AC-out-2.
3.1.6. Three phase capability
The unit can be connected with others and configured for three-phase output. It is possible connect up to 6 sets in parallel in three
phases, to a total of 18 units.
3.1.7. PowerControl – maximum use of limited AC power
The product can supply a huge charging current. This implies heavy loading of the AC mains or generator. Therefore a maximum
current can be set. The product then takes other power users into account, and only uses 'surplus' current for charging purposes.
3.1.8. PowerAssist – Extended use of generator or shore current
This feature takes the principle of PowerControl to a further dimension allowing the product to supplement the capacity of the
alternative source. Where peak power is often required only for a limited period, the product will make sure that insufficient AC
mains or generator power is immediately compensated for by power from the battery. When the load reduces, the spare power is
used to recharge the battery.
3.1.9. Programmable
All settings can be changed with a PC and free of charge software, downloadable from our website www.victronenergy.com. See
this manual for more information - https://www.victronenergy.com/media/pg/VEConfigure_Manual/en/index-en.html
3.1.10. Programmable relay
The product is equipped with a programmable relay. The relay can be programmed for different applications, for example as
a starter relay for a generator.
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Page 3 Product Description

3.1.11. External current transformer (option)
External current transformer option to implement PowerControl and PowerAssist with external current sensing
3.1.12. Programmable analog/digital input/output ports (Aux in 1 and Aux in 2, see appendix)
The product is equipped with 2 analog/digital input/output ports.
These ports can be used for several purposes. One application is communication with the allow-to-charge and allow-to-discharge
BMS controls of a lithium-ion battery.
3.2. Features specific on-grid and off-grid systems combined with PV
3.2.1. External current transformer (optional)
When used in a grid-parallel topology the internal current transformer cannot measure the current to or from the mains. In this
case an external current transformer has to be used. See appendix A. Contact your Victron Distributor for further information
about this installation type
3.2.2. Frequency shift
When solar inverters are connected to the AC-output of the product, excess solar energy is used to recharge the batteries. Once
the absorption voltage is reached, charge current will reduce and excess energy will be fed back into the mains. If the mains is
not available, the product will slightly increase the AC frequency to reduce the output of the solar inverter.
3.2.3. Built-in Battery Monitor
The ideal solution when the product is part of a hybrid system (diesel generator, inverter/chargers, storage battery, and alternative
energy). The built-in battery monitor can be set to start and stop the generator:
• Start at a preset % discharge level, and/or
• start (with a preset delay) at a preset battery voltage, and/or
• start (with a preset delay) at a preset load level.
• Stop at a preset battery voltage, or
• stop (with a preset delay) after the bulk charge phase has been completed, and/or
• stop (with a preset delay) at a preset load level.
3.2.4. Autonomous operation when the grid fails
Houses or buildings with solar panels or a combined micro-scale heating and power plant or other sustainable energy sources
have a potential autonomous energy supply which can be used for powering essential equipment (central heating pumps,
refrigerators, deep freeze units, Internet connections, etc.) during a power failure. A problem is however that grid connected
sustainable energy sources drop out as soon as the grid fails. With the product and batteries, this problem can be solved: the
product can replace the grid during a power failure. When the sustainable energy sources produce more power than needed,
the product will use the surplus to charge the batteries; in the event of a shortfall, the product will supply additional power from the
battery.
3.3. Battery charger
3.3.1. Lead-acid batteries
Adaptive 4-stage charge algorithm: bulk – absorption – float – storage
The microprocessor-driven adaptive battery management system can be adjusted for various types of batteries. The adaptive
function automatically adapts the charging process to battery use.
The right amount of charge: variable absorption time
In the event of slight battery discharge, absorption is kept short to prevent overcharging and excessive gas formation. After deep
discharging, the absorption time is automatically extended in order to fully charge the battery.
Preventing damage due to excessive gassing: the BatterySafe mode
If, in order to quickly charge a battery, a high charge current in combination with a high absorption voltage has been chosen,
damage due to excessive gassing will be prevented by automatically limiting the rate of voltage increase once the gassing voltage
has been reached.
Less maintenance and aging when the battery is not in use: the Storage mode
EasySolar-II GX - Product Manual
Page 4 Product Description

The Storage mode kicks in whenever the battery has not been subjected to discharge during 24 hours. In the Storage mode float
voltage is reduced to 2,2V/cell (13,2V for 12V battery) to minimise gassing and corrosion of the positive plates. Once a week the
voltage is raised back to the absorption level to 'equalize' the battery. This feature prevents stratification of the electrolyte and
sulphation, a major cause of early battery failure.
Battery voltage sense: the correct charge voltage
Voltage loss due to cable resistance can be compensated by using the voltage sense facility to measure voltage directly on the
DC bus or on the battery terminals.
Battery voltage and temperature compensation
The temperature sensor (supplied with the product) serves to reduce charging voltage when battery temperature rises. This is
particularly important for maintenance-free batteries, which could otherwise dry out by overcharging.
3.3.2. Li-ion batteries
Victron LiFePO4 Smart batteries
Use the VE.Bus BMS
3.3.3. Other Li-ion batteries
Please see https://www.victronenergy.com/live/battery_compatibility:start
3.3.4. More on batteries and battery charging
Our book 'Energy Unlimited' offers further information on batteries and battery charging, and is available free of charge on our
website: https://www.victronenergy.com/support-and-downloads/technical-information.
For more information on adaptive charging, please also refer to the General Technical Information on our website.
3.4. ESS – Energy Storage Systems: feeding energy back into the grid
When the product is used in a configuration in which it will feed back energy into the grid it is required to enable grid code
compliance by selecting the appropriate grid code country setting with the VEConfigure tool.
Once set, a password will be required to disable grid code compliance or change grid code related parameters. Contact your
Victron Distributor if you require this password.
Depending on the grid code, there are several reactive Power control modes;
• Fixed cos φ
• Cos φ as a function of P
• Fixed Q
• Q as a function of input voltage
Figure 1.
Q
P
1.0 Smax
0.1 Smax
0.75 PD -0.75 PD
PD
Reactive Power capability
If the local grid code is not supported by the product an external certified interface device should be used to connect the product
to the grid.
The product can also be used as a bidirectional inverter operating parallel to the grid, integrated into a customer designed system
(PLC or other) that takes care of the control-loop and grid measurement,
Special note regarding NRS-097 (South Africa)
1. The maximum allowed impedance of the network is 0.28Ω + j0.18Ω
2. The inverter is fulfilling the unbalance requirement in case of multiple single phase units only when the Color Control GX is
part of the installation.
Special notes regarding AS 4777.2 (Australia/New Zealand)
EasySolar-II GX - Product Manual
Page 5 Product Description

1. Certification and CEC approval for off-grid use does NOT imply approval for grid-interactive installations. Additional
certification to IEC 62109.2 and AS 4777.2.2015 are required before grid-interactive systems can be implemented. Please
check the Clean Energy Council website for current approvals.
2. DRM – Demand Response Mode When the AS4777.2 grid code has been selected in VEConfigure, DRM 0 functionality is
available on port AUX1 (see appendix A. To enable grid connection, a resistance of between 5kOhm and 16kOhm must be
present between the terminals of port AUX1 (marked + and - ). The product will disconnect from the grid in case of an open
circuit or a short circuit between the terminals of port AUX1. The maximum voltage that may be present between the terminals
of port AUX1 is 5V. Alternatively, if DRM 0 is not required, this functionality can be disabled with VEConfigure.
EasySolar-II GX - Product Manual
Page 6 Product Description

4. Operation
4.1. On/Off/Charger Only Switch
The switch is located on the underside to the bottom right of the product.
The switch has three positions. The centre position 0 is Off. The I position is On, and the II position is Charger Only.
When switched to 'I / On' (rocked towards the front of the unit), the product will come into operation and the inverter is fully
functional.
If an AC voltage is connected to the 'AC in' terminal, it will be switched through to the 'AC out' terminal, if within specifications.
The inverter will switch off, and the charger commences charging. 'Bulk', 'Absorption' or 'Float' will display, depending on the
charger mode.
If the voltage at the 'AC-in' terminal is rejected, the inverter will switch on.
When the switch is switched to 'II / Charger Only', only the battery charger of the Multi will operate (if mains voltage is present). In
this mode input voltage also is switched through to the 'AC out' terminal.
NOTE: When only the charger function is required, ensure that the switch is switched to 'II / Charger Only'. This prevents the
inverter from being switched on if the mains voltage is lost, thus preventing your batteries from running flat.
EasySolar-II GX - Product Manual
Page 7 Operation

5. GX LCD Interface
The display screen will present useful information about your system.
5.1. On/off behaviour
When the product is switched off with the physical switch on the device or with the Remote On/Off terminals, then the GX card is
off as well. If you switch the product remotely, using a Digital Multi Control, then the GX card will remain powered. Also when
switching the inverter/charger off from within the GX menus, the GX card will remain powered.
Lastly, when the inverter/charger switches itself off due to an alarm, such as low battery or overtemperature, then the GX card will
remain powered and functional as well.
5.2. Push button behaviour
When the GX Card is on, pushing the button beside the screen will increase the brightness of the backlight. The backlight will dim
itself again after 5 minutes.
Once the backlight has been activated, pushing the button again will cycle through the available display options. Some options
will be displayed automatically, and others require a button push to display.
5.3. Information displayed
• Solar Power, Voltage and Charge state (if connected)
• ESS/DVCC reason codes (if active)
• Solar Daily Yield
• Inverter/charger charge state (eg Bulk, ESS)
• Battery State of Charge, Power and Voltage
• Network IP Address and Connection Type (if connected).
• AC input and output Power
In a system with more than one phase, there will be additional AC input and output information available, eg
• Phase 1 AC input Voltage and Power.
• Phase 1 AC output Voltage and Power
• Phase 2 AC input Voltage and Power.
• Phase 2 AC output Voltage and Power.
• Phase 3 AC input Voltage and Power.
• Phase 3 AC output Voltage and Power.
5.4. Error Code Display
If there is an error with the system, the error code will be displayed on the screen. The screen will display VE.Bus error code
numbers, and MPPT error codes (if connected).
Basic information about the VE.Bus Error codes are in the Error Indications section.
For further details about the error codes please see:
VE.Bus Error Codes
MPPT Error Codes
The error will display until it is cleared.
EasySolar-II GX - Product Manual
Page 8 GX LCD Interface

6. PV array design
6.1. Sizing the array
We recommend to use the MPPT Sizing Calculator available on our website
• The solar charge controller will operate only if the PV voltage exceeds battery voltage (Vbat).
• PV voltage must exceed Vbat + 5V for the controller to start. Thereafter minimum PV voltage is Vbat + 1V.
• Maximum PV Array open circuit voltage is 250V.
• Maximum PV Array short circuit current is 35A.
For example:
• Minimum number of cells in series: 144 (4x 12V panel or 2x 24V panel in series).
• Maximum: 360 cells (10x 12V or 5x 24 panel in series).
Remark: at low temperature, the open circuit voltage of a 360 cell array may exceed 250V, depending on local conditions and cell
specifications. In that case, the number of cells in series must be reduced.
The MPPT component of the EasySolar-II GX is pre-programed to match the nominal battery voltage requirements of the
included inverter/charger. Specific battery voltage charging parameters may need to be programmed in addition to the inverter/
charger voltage parameters.
EasySolar-II GX - Product Manual
Page 9 PV array design

7. Accessing Connection Points
All electrical connections can be accessed by removing the bottom plate. See below photos of the 3K and 5K EasySolar-II GX
with the bottom plate removed.
EasySolar-II GX - Product Manual
Page 10 Accessing Connection Points

8. Installation
This product 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
8.1. Location
The product must be installed in a dry and well-ventilated area, as close as possible to the batteries. There should be a clear
space of at least 10 cm around the product for cooling.
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 the
batteries.
This product is suitable for wall mounting. A solid surface, suitable for the weight and dimensions of the product must be available
(e.g., concrete, or masonry). For mounting purposes, a hook and two holes are provided at the back of the casing (see appendix
G). The device can be fitted either horizontally or vertically. For optimal cooling, vertical fitting is preferred.
The interior of the product must remain accessible after installation.
Try and keep the distance between the product and the battery to a minimum in order to minimize cable voltage losses.
For safety purposes, this product should be installed in a heat-resistant environment. You should prevent the presence of e.g.
chemicals, synthetic components, curtains or other textiles, etc., in the immediate vicinity.
8.2. Connection of battery cables
In order to utilize the full capacity of the product, batteries with sufficient capacity and battery cables with sufficient cross section
should be used. See table.
24/3000/70 48/3000/35 48/5000/70
Recommended battery capacity (Ah) 200-800 100–400 200-800
Recommended DC fuse 300 A 125 A 200 A
Recommended cross section (mm²) per + and - connection terminal
0 – 5 m 50 mm² 35 mm² 70 mm²
5 – 10 m 95 mm² 70 mm² 2x70 mm²
Remark: Internal resistance is the important factor when working with low capacity batteries. Please consult your supplier or the
relevant sections of our book 'Energy Unlimited', downloadable from our website.
8.3. Battery Connection Procedure
Proceed as follows to connect the battery cables:
Use a torque wrench with insulated box spanner in order to avoid shorting the battery. Maximum torque: 14
Nm Avoid shorting the battery cables.
Specific care and attention must be taken when making the battery connections. Correct polarity must be
confirmed with a multimeter before connection. Connecting a battery with incorrect polarity will destroy the
device and is not covered by warranty.
EasySolar-II GX - Product Manual
Page 11 Installation

• Connect the battery cables. First the - cable then the +. Be aware that there may be a spark when making the battery
connections.
• Tighten the nuts to the prescribed torques for minimal contact resistance.
8.4. Connection of the PV array
1. Confirm correct PV polarity
2. Remove the Solar connection cover
3. Connect the solar array to the M6 solar bolts.
NOTE: if connected with reverse polarity, the PV voltage will drop, the controller will heat up but will not charge the battery.
EasySolar-II GX - Product Manual
Page 12 Installation

8.5. Connection of the AC cabling
This product is a safety class I device, intended for a TN system (supplied with a ground terminal for safety
purposes). Its AC input and/or output terminals must be provided with uninterruptible grounding for
safety purposes. An additional grounding point bonded to the chassis is located inside the terminal
cover of the product. See Appendix A.
In a fixed installation, an uninterruptible grounding can be secured by means of the grounding wire of the AC
input. Otherwise the casing must be grounded.
This product is provided with a ground relay (relay H, see Appendix B) that automatically connects the
Neutral output to the chassis if no external AC supply is available. If an external AC supply is provided,
the ground relay H will open before the input safety relay closes. This ensures the correct operation of an
earth leakage circuit breaker that is connected to the output.
In a mobile installation (for example, with a shore current plug), interrupting the shore connection will
simultaneously disconnect the grounding connection. In that case, the casing must be connected to the
chassis (of the vehicle) or to the hull or grounding plate (of the boat). In case of a boat, direct connection to
the shore ground is not recommended because of potential galvanic corrosion. The solution to this is using an
isolation transformer. Torque: 2 Nm
The terminal blocks can be found on the printed circuit board, see Appendix A.
Do not invert neutral and phase when connecting the AC.
•AC-in The AC input cable can be connected to the terminal block 'AC–in'. From left to right: "N" (neutral), "PE" (earth) and "L"
(phase) The AC input must be protected by a fuse or magnetic circuit breaker rated at 32A or less, and cable cross-
section must be sized accordingly. If the input AC supply is rated at a lower value, the fuse or magnetic circuit breaker
should be down sized accordingly.
•AC-out-1 The AC output cable can be connected directly to the terminal block 'AC-out'. From left to right: "N" (neutral), "PE"
(earth) and "L" (phase) With its PowerAssist feature the Multi can add up to its rated power (e.g 3000 / 230 = 13A) to the output
during periods of peak power requirement. Together with a maximum input current of 32A this means that the output can supply
up to 32 + 13 = 45 A. An earth leakage circuit breaker and a fuse or circuit breaker rated to support the expected load must be
included in series with the output, and cable cross-section must be sized accordingly.
•AC-out-2 A second output is available that disconnects its load in the event of battery operation. On these terminals,
equipment is connected that may only operate if AC voltage is available on AC-in-1, e.g. an electric boiler or an air conditioner.
The load on AC-out-2 is disconnected immediately when the inverter/charger switches to battery operation. After AC power
becomes available on AC-in-1, the load on AC-out-2 will be reconnected with a delay of approximately 2 minutes. This to allow
a genset to stabilise
8.6. Optional Connections
A number of optional connections are possible:
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8.6.1. Remote Control
The product can be remotely controlled in two ways.
• With an external switch (connection terminal M, see Appendix A). Operates only if the switch on the device is set to "on".
• With a Digital Multi Control panel (connected to one of the two RJ45 sockets L, see Appendix A). Operates only if the switch on
the device is set to "on"
The Digital Multi Control panel has a rotary knob with which the maximum current of the AC input can be set: see PowerControl
and PowerAssist.
8.6.2. Programmable relay
The relay can be programmed for all kinds of other applications, for example as a starter relay for a generator.
8.6.3. Programmable analog/digital input/output ports
The product is equipped with 2 analog/digital input/output ports.
These ports can be used for several purposes. One application is communication with the allow-to-charge and allow-to-discharge
BMS controls of a lithium-ion battery.
8.6.4. Voltage sense (connection terminal J, see Appendix A)
For compensating possible cable losses during charging, two sense wires can be connected with which the voltage directly on the
battery or on the positive and negative distribution points can be measured. Use wire with a cross-section of 0,75mm².
During battery charging, the inverter/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.
8.6.5. Temperature sensor (connection terminal J, see Appendix A)
For temperature-compensated charging, the temperature sensor (supplied with the inverter/charger) can be connected. The
sensor is isolated and must be fitted to the negative terminal of the battery.
8.6.6. Parallel Connection
It is required to use identical units for three phase and parallel systems. In this case, as only one GX device is allowed per
system, if you wish to parallel and/or three phase with this product, you must find the same model MultiPlus-II to pair.
To assist with finding identical units, consider instead using MultiPlus-II for parallel and three phase systems, and an external GX
device.
Up to six units can be connected in parallel. When connecting this product with MultiPlus-II in a parallel system, the following
requirements must be met:
It is essential the negative battery terminal between the units is always connected. A fuse or circuit breaker is
not allowed on the negative.
• All units must be connected to the same battery.
• A maximum of six units connected in parallel.
• The devices must be identical (aside from GX part) and have the same firmware.
• The DC connection cables to the devices must be of equal length and cross-section.
• If a positive and a negative DC distribution point is used, the cross-section of the connection between the batteries and the DC
distribution point must at least equal the sum of the required cross-sections of the connections between the distribution point
and the units.
• Always interconnect the negative battery cables before placing the UTP cables.
• Place the units close to each other, but allow at least 10cm for ventilation purposes under, above and beside the units.
• UTP cables must be connected directly from one unit to the other (and to the remote panel). Connection or splitter boxes are
not permitted.
• Only one remote control means (panel or switch) can be connected to the system. That means only one GX device. If multiple
GX models are to be connected in parallel or three phase, the internal connection between GX card and other components
must be disconnected. For this reason it is recommended to use the MultiPlus models without built-in GX for these systems.
8.6.7. Three-phase operation
The product can also be used in 3-phase wye (Y) configuration. To this end, a connection between the devices is made by means
of standard RJ45 UTP cables (the same as for parallel operation). The system will require subsequent configuration.
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Pre-requisites: see Section Voltage Sense
1. Note: the product is not suitable for 3-phase delta (Δ) configuration.
2. When the AS4777.2 grid code has been selected in VEConfigure, only 2 units in parallel per phase are allowed in a three
phase system.
For full details on parallel and three-phase configuration always discuss with your Victron distributor first and please see this
specific manual:
https://www.victronenergy.com/live/ve.bus:manual_parallel_and_three_phase_systems
8.6.8. Connection to the VRM Portal
Connection of the product to VRM requires an internet connection. This can be made via wifi, or preferably a hardwired ethernet
cable to an internet connected router.
The VRM site id is located on a sticker inside the cable connections area of the device.
For more information to set up VRM, refer to the VRM Getting Started Manual.
8.7. GX - How to update firmware
8.7.1. Changelog
The change log is available in Victron Professional, under Firmware, Venus OS.
8.7.2. Via internet or with microSD-card/USB-stick
There are two ways to update the firmware:
1. Update it via the internet, either manually or let it check for new updates every day
2. Update it from a microSD-card or USB-stick
8.7.3. Direct download from the internet
Direct download from the internet
To update from the internet, navigate to: Settings→ Firmware→Online updates.
On GX devices without a display (ie. a Venus GX or Cerbo GX without GX Touch), use Remote Console to get to below menus.
8.7.4. MicroSD-card or USB-stick
Updating with a microSD-card or USB-stick is called 'Offline updating'. Use it when updating a device that is not connected to the
internet.
Step 1. Download
Get the latest swu file:
•GX Card in the MultiPlus-II or EasySolar GX - venus-swu-nanopi.swu
Note that the same files, and the change log, is available on Victron Professional. That also features a dropbox connection, so
you can always have the latest file available on your laptop.
Step 2. Install on a microSD card or usb stick
Store the file in the root folder of a USB-stick or microSD-card.
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Step 3. Insert the device
Note that you will see a warning “Not using media for storing logs”. That warning can safely be ignored.
Step 4. Initiate the update
Navigate to Settings → Firmware → Offline updates.
Press Check for updates
If the firmware in the microSD-card or USB-stick is newer than the running one, “Update available” item will appear, press it to
start the update process.
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9. Configuration
This section is intended mainly for stand-alone applications
For grid connected Energy Storage Systems (ESS) please see https://www.victronenergy.com/live/ess:start
• Settings may only be changed by a suitable qualified installer with the appropriate training, and subject to local requirements.
Please contact Victron for further information or necessary training.
• Read the instructions thoroughly before implementing changes.
• During setting of the charger, the AC input must be removed.
9.1. Standard settings: ready for use
On delivery, the product is set to standard factory values. In general, these settings are suitable for single-unit operation.
Possibly, the standard battery charging voltage is not suitable for your batteries! Refer to the manufacturer's
documentation, or to your battery supplier!
Standard factory settings
Setting 24 V / 48 V
Inverter frequency 50 Hz
Input frequency range 45 – 65 Hz
Input voltage range 180 – 265 VAC
Inverter voltage 230 VAC
Stand-alone / parallel / 3-phase stand-alone
AES (Automatic Economy Switch) off
Ground relay on
Charger on / off on
Battery charge curve four-stage adaptive with BatterySafe mode
Charging current 100% of the maximum charging current
Battery type Victron Gel Deep Discharge (also suitable for Victron AGM Deep Discharge)
Automatic equalisation charging off
Absorption voltage 28.8 V / 57.6 V
Absorption time up to 8 hours (depending on bulk time)
Float voltage 27.6 V / 55.2 V
Storage voltage 26.4 V / 52.8 V (not adjustable)
Repeated absorption time 1 hour
Absorption repeat interval 7 days
Bulk protection on
AC input current limit 32A for 3kVA model and 50A for 5kVA model (= adjustable current limit for
PowerControl and PowerAssist functions)
UPS feature on
Dynamic current limiter off
WeakAC off
BoostFactor 2
Programmable relay alarm function
PowerAssist on
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