Description of Device | Operating Mode
14 | Doc. No. 982056, Version 01, SelectSun 40K
3 Description of Device
3.1
Operating Mode
The SelectSun 40K transforms the direct current generated by photovoltaic (PV) modules into alternating
current and feeds this into the public grid.
Figure 1: How it works: a grid-connected PV system with photovoltaic inverter
1
PV modules
2
Solar string combiner box
3
SelectSun 40K photovoltaic inverter
4
Fuse switch disconnector or circuit breaker
5
Grid Protection
6
Isolation transformer is required for medium-voltage network
7
Low or medium-voltage AC grid
3.2
Infrastructure Requirements
Additional required equipment 40K at the low voltage
network
40K at the medium voltage
network
DC load break switch
integrated*
integrated*
AC load break switch
necessary
necessary
Central grid protection device
(VDE-AR-N 4105)
necessary
necessary
LV-/MV-Transformer
not necessary
necessary
*local regulation might require an additional DC switch at the external DC combiner box.
The following points are to be considered when planning the infrastructure:
•
The 40K can feed into the low-voltage grid and the medium-voltage grid.
