Operating Manual

Installation, assembly and commissioning for
the first time
Version 1.1 Page 46 of 92
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 9.
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