Description of Device | Infastructure Requirements
Doc. No. 982055, Version 01, SelectSun 20K
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3 Description of Device
3.1
Infastructure Requirements
Additional required equipment
20K at the low voltage network
AC load break switch
necessary
Central grid protection device (VDE-AR-N 4105)
only for systems above 30 kVA required
Medium voltage transformer
not necessary
The following points are to be considered when planning the infrastructure:
•
The 20K can only feed into the low-voltage grid.
•
The 5-wire power supply line must be equipped with an appropriate AC disconnecting device.
•
If the inverters are connected with the medium-voltage-grid, it must be operated with electrically
isolating transformers.
•
No other equipment may be connected between the transformer and inverters.
The following standards and technical regulations are also to be observed:
IEC 60364-4-41
Protection: Protection against electric shock
IEC 60364-4-43
Protection for safety - Protection against overcurrent
IEC 60364-5-52
Selection and erection of electrical equipment - wiring systems
BDEW
Technical Guidelines
VDN
Technical Guidelines
3.2
Features of SelectSun 20K
The SelectSun 20K is a transformer-less, three-phase solar inverter, which has a particularly high efficiency
at any operating point. Heat is dissipated only be convection. An internal monitor prevents the device from
exceeding the permissible ambient temperature. The inverter is designed such that the device does not have
to be opened for assembly and connection work. All electrical connections are exclusively made with
lockable connectors. The device features an integrated DC isolating switch according to EN 60947-3, which
reduces the overall installation work. The inverter provides the usual communication interfaces RS485 and
Ethernet. An illuminated graphical display shows the development of the feed-in power and other operating
data in a clearly arranged manner. An 8-key control panel below the display also provides excellent control
and navigation convenience. Based on its design in protection class IP 65, the inverter can be installed at an
outside location as long as it is not in direct sunlight. An installation protected against sunlight under the solar
modules is ideal here.
