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battery_compatibility:bmz_ess

Victron & BMZ ESS 3.0 / ESS 7.0

The combination of Victron products with the BMZ ESS 7.0 battery has been tested and certified by the R&D departments. The combination is actively supported by both companies.

1. Introduction

1.1 Compatible Victron products

All 48V Multis and Quattros. And always a Venus device is necessary in the system, since that has the canbus port which is used for the (required!) communication between the ESS battery and the Victron system.

1.2 Notes

  • BMZ batteries can only be used in a Victron ESS installation installation that uses the ESS Assistant.
  • Paralleling multiple BMZ ESS batteries to expand capacity is possible. Contact BMZ for more information.
  • Derating, based on the dynamic BMZ ESS charge- and discharge limits:
    • Minimum CCGX version is v1.72
    • The derating mechanism is not very precise yet. In other words, do not expect a discharge limit of 30A to result in a precise discharge of 30A.
    • Actual charge- and discharge limits are visible in the Parameters page. See screenshot below in Chapter 4.
  • BMZ batteries and MPPT Solar Chargers with a VE.Can communication port cannot be both connected to the CCGX, because of different canbus speeds. Use Solar Chargers with a VE.Direct comm. port instead.

1.3 System diagram

2. Venus device needed

To use the BMZ ESS in Victron system, it is necessary to use a Color Control GX or Venus GX. On first commissioning an external power supply (Not the 48V from the BMZ-Battery) is needed. The CCGX/VGX sends a keep alive signal to the BMZ ESS via canbus. This will only be send once the canbus baud rate is changed (see 5. Venus Device Configuration). Without it, the battery will have a communication fault and shut down after 10sec.

3. Wiring of communication cables

Use the VE.Can to CAN-bus BMS type B Cable, part number ASS030720018. Plug the side which is labeled Battery BMS into the BMZ BMS. Plug the side labeled Victron VE.Can into the Venus-device.

Then, plug a VE.Can terminator in the other VE.Can socket on the Venus device. Two VE.Can terminators are included with the package of the CCGX as an accessory, only one is used. Keep the other one as a spare.

More information about the cable can be found in its manual.

Without properly connecting this cable, the battery will stop charging/discharging after several minutes. Also, the battery will not show up on the display of the Venus device.

4. VEConfigure settings

4.1 General tab

  1. Check “Enable battery monitor”
  2. Enter the battery capacity:
    1. BMZ ESS 3.0 - 121.5 Ah
    2. BMZ ESS 7.0 - 121.5 Ah
  3. The other parameters (“State of charge when bulk finished” and “Charge efficiency”) can be left to their default setting. They are not used in this setup.

4.2 Charger tab

Parameter Setting
Battery type Lithium
Charge curve Fixed
Absorption voltage 60.75 V
Float voltage 60.00 V
Absorption time 1 Hr

Note: make sure to double check the float voltage after completing Assistants, and if necessary set it back to 60.00 V.

4.3 ESS Assistant

Select the fourth battery type:

Then:

  1. Do not change the dynamic cut-off values, they have already been set correctly after selecting the lithium battery type.
  2. Sustain voltage: 50V
  3. Same for the restart offset: do not change that.

5. Venus device Configuration

  • Select the CAN-bus BMS (500 kbits/s) CAN-profile in the Venus device. Menu path: Settings → Services → CAN-profile. Note that this changes the function of a VE.Can port: it is not possible to connect both VE.Can products and a BMZ battery together on a Color Control GX. Is is possible on the Venus GX
  • After properly wiring and setting up, the BMZ ESS will be visible as a battery in the device list:
  • The parameters option within the battery page shows the actual battery charge and discharge limits:

DISQUS

battery_compatibility/bmz_ess.txt · Last modified: 2018-11-07 08:50 by alexander.joist_ibc-solar.co.za