VICTRON AND SOLAR MD LITHIUM-ION BATTERY

Victron & Solar MD Battery
 

The combination of Victron products with Solar MD Battery lithium batteries has been tested and certified by the Solar MD R&D department. This combination has extensive field experience and is actively supported by Solar MD.
 

The Solar MD Battery includes an integrated Battery Management System (BMS) with each battery module and a Logger V2 that interfaces with the Victron GX-device, and supports multiple battery modules.
 

To find out how to install the Logger V2 watch this YouTube installation video.

 

Supported models

victron 1.png

For SS237 – 25.6V (24V systems) please contact Solar MD support team for further assistance.

 

== System overview ==

solarmd-victron_wiring.jpg

Wiring schematic Victron and Solar MD

 

== Typical installation with a single SS4074 and Multiplus II 48/3000 ==

typical_solar_md_victron_installation.pn

Typical residential Victron and Solar MD battery

 

== Typical installation with Multiple SS202 modules, 3 Quattros, 3 MPPTs, and Fronius integration ==

unilec_installation_minigrid.jpeg

Typical Solar MD and Victron Mini-grid container solution

 

Product & System compatibility
 

Off-grid, Backup and Energy Storage Systems are possible.
 

Victron + Solar MD Battery can be used for the following system types:

  • Energy Storage Systems – Self Consumption (ESS – Start page)

  • Grid Backup

  • Off-grid
     

A Venus-device is required, eg. Color Control GX (CCGX), Venus GX (VGX) etc.
 

It is essential to use the CAN-bus connection of a GX-device with the Solar MD batteries for the keep-alive signal, communication of charge and discharge limits, error codes and state of charge.
 

When used with Solar MD batteries, the minimum required firmware version for the GX-device is v2.15.
 

Please use the latest firmware version on all connected devices including CCGX/VGX, Inverter/Charger, and MPPTs.  There are regular updates to improve performance and reliability.
 

All 48V Multis, MultiPlusses, MultiGrids and Quattros are compatible with SS4074 / SS4037 / SS202
 

The minimum firmware version is 422.  Though updating to the latest firmware is recommended where possible.  These inverter/charger units must be connected to the GX-device via the VE.Bus connection port.
 

In grid-connected systems advanced control functions are configurable in the ESS settings on the GX-device.  In off-grid systems, the control functions of the Solar MD Battery Management System (BMS) are built into the latest version of the GX-device.
 

All 48V Blue Solar and Smart Solar MPPT chargers are compatible with SS4074 / SS4037 / SS202
 

For proper operation, the Battery battery needs to be able to control the charge current of the solar MPPTs.
 

It is recommended to use the MPPTs with VE.Direct port with Solar MD batteries.  MPPTs with a VE.Direct port MPPTs are controlled via the GX-device.
 

Make sure the GX-device runs v2.15 or later and the MPPTs are v1.39 or the latest available version.
 

The MPPT requires connection to the GX-device to regulate charge currents as the batteries require (due to temperature, etc).
 

To test operation try disconnecting the GX-device from the MPPT.  After a time-out the MPPT will stop charging and flash an error code on it's LEDs.  The error code is error #67: no BMS. MPPTs with a VE.Can port need firmware to be at least version v2.05.
 

When using VE.Can MPPTs it is recommended to use the Venus GX (VGX), instead of the CCGX. The VGX has two CAN-bus interfaces available and allows communication between the MPPTs, Solar MD and the VGX.

 

Battery compatibility
 

The following batteries are supported for the 48V systems:

victron 2.png

For SS237 – 25.6V (24V systems) please contact Solar MD support team for further assistance.
 

Solar MD periodically releases firmware updates for the Logger V2 and BMS.  Logger V2 Firmware versions earlier than V6-13 are not compatible with Victron equipment and can cause the battery to not be detected.  All software updates of Solar MD equipment are done remotely and automatically as soon as the Logger V2 has an internet connection.
 

Minimum Solar MD firmware version: Logger V2 6.13_15-Mar-2017.
 

This version can be seen on the Solar MD monitoring platform.
 

Batteries BMS_PL with older firmware versions can be updated with BMS_EM hardware.  Please contact Solar MD for more information.

 

Minimum Battery Sizing
 

The following information is provided by Solar MD and is reproduced here for your convenience and should always be confirmed with the latest Solar MD manuals and specifications.
 

Each battery module is 72Ah (SS4037) or 144Ah (SS4074) at 48V (51.2V nominal).
 

The following charge rates are managed automatically by the Solar MD Logger V2 and GX-device.  Temperature effects on charge rates should be considered in the design stage in extreme hot and cold climates.
 

Using very large solar arrays with battery banks that are too small can exceed the limits of the batteries ability to charge and possibly lead to the Logger V2 triggering over-current alarms.
 

The table below shows the minimum number of battery modules required for the specified inverter/charger configuration:


Battery Modules Required – per 3.7kWh (SS4037)

victron 3.png

Battery Modules Required – per 7.4kWh (SS202 / SS4074)

victron 4.png

CAN Bus Wiring
 

Use any UTP cable.  Plug 3 of the wires (PIN 7, PIN 8, PIN 3) into the Solar MD Logger V2.  Plug the other side with RJ45 connector into the GX-device.

canbus_solarmd.png

Solar MD Logger V2 CAN 2 wiring to Victron Venus

Then plug a VE.Can terminator in the other VE.Can socket on the GX-device.  Alternatively you can use the termination on the Logger V2 side.  Two VE.Can terminators are included with the package of the GX-device as an accessory, only one is used.  Keep the other one as a spare.
 

More information about the cable can be found in it's manual.
 

Without properly connecting this cable the battery will not show up on the GX-device display.
 

It is important to ensure this connection and display of the battery on the GX-device display before attempting firmware updates or settings changes on other devices if they depend on the power supply from the battery.
 

It is the Logger V2 that signals the battery modules to shut down if the signal from the GX-device has not been received.

 

VEConfigure settings
 

This section presumes familiarity with VEConfigure software.
 

General tab
 
  • Check the “Enable battery monitor” function.

  • Set the battery capacity to the total capacity of the battery: eg 72Ah times the number of battery modules for the 3.7 model.

  • The other parameters (“State of charge when bulk finished” and “Charge efficiency”) can be left to their default setting: They are ignored for Solar MD battery installation.
     

Charge parameters
 

In normal operation, the charge parameters are controlled by the Solar MD Logger V2 and communicated through the system by the Venus Device to the inverter/charger and MPPT.
 

However, as a precaution, it is advised to set these as suggested below.
 

Charger tab
victron 5.png

Note: make sure to double-check the float voltage after completing Assistants, and if necessary, set it back to 53.4 V.

 

Inverter settings
 

In the Inverter tab of VEConfigure

victron 6.png

* The pre-alarm setting is dependent on your preference and on site-specific requirements.
 

You may wish for this to be activated earlier (eg. 51V) in an off-grid situation to allow time to start a backup generator.

If the system is configured in ESS mode, you may not wish to have this alarm trigger until below the Sustain threshold voltage (eg. 50V), as this system is in no danger normally and will ‘sustain’ at 51V without needing to trigger an alarm.

ESS System Settings
 

If you are using the battery as part of a grid-connected ESS system, please review the ESS Quickstart guide and Design and Installation Manual.
 

The settings that are specific to the Solar MD battery in the VEConfig ESS Assistant are below:
 

Select the externally managed Lithium battery option

ess-battery-system-selection.png

Solar MD Lithium Setting on Victron VE Configure

victron 7.png

GX-device and Logger V2 Configuration
 

On the GX-device, go to Settings > System setup:

victron 8.png

If you have a VE.Can MPPT, it is advised to use the Venus GX in place of the CCGX.
 

  • Select the CAN-bus BMS (500 kbit/s) CAN-profile in the CCGX.


Menu path:  Settings → Services → CAN-profile.

2019-07-27_17_05_49-_-_vrm_portal_-_can_

500kbit/s check on Victron CAN bus profile for Solar MD battery
 

On the Solar MD portal (http://login.mypower24.co.za), select Victron Bridge on CAN2:
 

Menu path:  My Devices → Logger → Interfaces → CANBUS2.

After choosing Victron Bridge, proceed with a software reboot on the Logger V2 in the Tab “System Settings > Soft Reboot”.

solar_md_portal.png

Solar MD Logger V2 – Victron translator
 

After properly wiring and setting up, the battery will be visible as a battery in the device list:

venus_solarmd.png

Showing Solar MD on Victron Venus device
 

(if you have multiple batteries a single entry will show up, which represents all batteries)
 

  • The parameters option within the battery page shows the actual battery charge and discharge limits.


This parameters page is also a good place to check that all batteries are connected and working properly. In normal working conditions, for the SS4037 (3.7kWh model), the current limit is 100A per module. For example, 140A charge current limit
(400 / 100 = 4) means there are 4 Solar MD batteries connected.


 

Color Control GX Configuration


The CCGX only has one available VE.Can port. It is not possible to connect both CAN products such as VE.Can MPPT (250 kbit/s) and a Battery battery CAN-bus (500 kbit/s) together on the CCGX.


As the Solar MD Logger V2 must be connected, you will need to use the port for that.  This will mean no data is collected from the VE.Can MPPT, nor can the CCGX control it.


This means you are required to use the “Allow to Charge” wire configuration for the MPPT.  “Allow to Charge” on the Logger V2 can

be set via the 2 provided Relays.

 
 
Venus GX Configuration

 

The VGX has two CAN-bus interfaces available.

 

The VE.Can MPPT remain connected to the VE.Can port, while the Solar MD CAN-bus cable should use the specific CAN-bus connections (H, L, GND).

 

This allows data from the MPPT and Solar MD battery simultaneously. You will only need to connect the Allow-to-charge wires if using the VE.Can MPPT and VGX.

 

The CAN-bus connections are galvanically isolated at the Solar MD Logger V2.

 

There are no issues using the non-isolated connection of the VGX.

VE-Direct MPPT Settings

 

In normal operation, the MPPT charge characteristics are governed by the GX-device connected to the Solar MD battery.

 

This section presumes familiarity with VictronConnect.

 

The settings below are a precautionary measure.

victron 9.png