Operating Manual

Installation, assembly and commissioning for
the first time
Version 1.1 Page 47 of 92
Prerequisites for the battery firmware version
Batteries can be connected in parallel from firmware version V2.00 onwards.
The BMZ Service Tool in a specific version (at least Version 0.0.26) must be used to update the battery to a new
firmware version.
Requirements for the battery inverter
The parallel connection capability of BMZ ESS 7.0 batteries is approved only with the battery inverters of SMA
Sunny Island.
Check whether the inverter used by you is approved for use with the BMZ ESS 7.0 battery storage system.
4.7 Connection concept of multiple BMZ ESS 7.0 batteries with one or more
battery inverters
4.7.1 Communication
Wiring of the communication line from the battery to the inverter
- Connect the CAN cable to the battery that has been configured as the master and connected with the
inverter.
Wiring of the communication line from between the batteries (internal communication of battery)
- All batteries in the parallel circuit are connected with each other via the RS485 bus for internal
communication between them. The batteries are connected in a bus topology. For this purpose, T-connectors
(or even Y-adapters) are used at the RJ45 sockets (“INTERNAL” label) of batteries.
- One T-connector (or even a Y-adapter) is used for each battery.