3. Application information
KP100L Quick Installation Guideline
13
3. Application information
■
DC side
DC switch / breaker
DC switch / circuit breaker is an obligatory prerequisite stipulated by DIN VDE 0100-712, the
installation standard for PV systems in Germany. For safety point of view during working on an
electrical device, it is necessary to disconnect from the energy supply. DC circuit breaker between the
PV modules and the inverter is used. Select DC circuit breaker with rate current is larger than designed
PV short circuit current on each DC input.
SPD (Surge Protective Device) in DC side
SPD (Surge protective device) is used to protect the inverter against lightening surge voltage.
■
AC Grid side
AC breaker
For protection of AC over current, use a 20 A trip breaker with B or C or D trip characteristics.
If you use the transformer, install the breaker between the transformer and the KP100L as shown in the
figure below.
Example of SPD
•
Class II
•
PV voltage 1000 VDC
•
Nominal discharge current (8/20us) I
n
:20 kA
•
Maximum discharge current (8/20us)I
max
:40 kA
•
Protection revel: 4 kV
This is just example. Contact company of
protection device for selection.
SPD on each input
Grid
N
3P
3P+N
Breaker
Breaker
