13
B) Parallel Mode
This mode is only used if several strings with the same number of modules are to be connected in parallel and the resulting
maximum input current per input exceeds 14 A.
Conditions for parallel mode:
•
The total current of all strings connected to the inverter must not exceed 28 A.
•
The strings have identical properties (module type, orientation and condition of the modules)
Example:
The PV panels are divided into three strings of 9A each. It is nevertheless possible to connect them to the inverter without
changing the string configuration. One string is connected to one of the two solar generator inputs. The other two strings are
connected in parallel via a Y contact and then connected to the remaining free input.
Procedure for parallel connection:
Danger to life or serious injury from electric shock!
•
Only qualified personnel must carry out the work described in this section.
•
Important: All voltage sources (DC /solar generator, DC /battery and AC /grid) must
be disconnected before carrying out any electrical work on the inverter.
•
To disconnect the solar generator voltage, turn the DC switch (on the inverter) to
the position '0'.
•
To disconnect the battery voltage, turn the DC switch (on the Power Battery Master)
to the position '0'.
•
To disconnect the mains voltage (AC) activate the circuit breaker or remove the
fuse . Do not reconnect until the work has been completed.
•
Only switch inverter back on after all electrical work has been completed.
•
Ensure that other persons stay away from cables and internal components.
Material not included in scope of supply.
Required cable:
AWG 24 … 10
Remove the inverter cover.
Identify the terminals for parallel operation.
Connect terminal X101 with X104.
5.4
DC connection
Danger to life or serious injury from electric shock!
•
A high voltage of up to 1000 V is applied to the DC cables while the PV system is
exposed to sunlight. Ensure that nobody touches the positive and negative cables at
the same time.
•
The inverter is transformerless. Therefore, the PV array must not be earthed!
•
Avoid traction forces on cables and plugs. Avoid sharp edges. Do not exceed the
maximum bending radius of the cables.
