Installation, assembly and commissioning
for the first time
Version 1.1
Page 61 of 113
4.6
Preparing the electrical connections for the parallel mode
Definition of parallel mode:
Parallel mode means the operation of
multiple
BMZ ESS 7.0 energy storage systems at
one or more
inverters.
Safety instructions
Please follow the safety instructions in the Safety section, page 13.
The following safety instructions are additionally applicable for the parallel operation:
If the battery is operated under full load, housing parts and lines may generate heat.
When wiring the batteries, ensure that a short-circuit is never formed between the plus and minus
poles of one or more batteries. There is a risk of life.
When laying the lines, do not extend them from the plus and minus poles.
When laying the lines (plus and minus poles), ensure that they are not rolled.
Establish the connections between the inverter and the battery
Pre-conditions:
The current isolator (NH isolator) of each battery must be pulled
The battery inverter must be switched off (“Off”)
Use a suitable switch cabinet to connect the batteries in the parallel circuit to the inverters.
BMZ recommends using a DC busbar with a suitable line fuse for each connected line.
BMZ recommends using products of SMA (Bat fuse) or Enwitec (BAT BREAKER BOX)
Check for the correct polarity carefully before establishing connections. Connection lines are marked in
different colours:
Plus pole = RED
Minus pole = BLACK
