SMA SC 100 Indoor Installation - Manual (Page 35)

SMA Solar Technology AG Electrical Connection
Installation Guide SC-100-IEN093231 35
The analog input of the external temperature sensor and both additional analog signal inputs are not
equipped with lightning and overvoltage protection as a standard feature. This can be retrofitted as
an option.
7.1.9 PV Generator Power Connection (DC Connection)
A busbar that allows string distribution boxes to be connected is located in the left lower area of the
inverter sidewall. Cables rated for a minimum of 900 V are required for connecting the DC cables to
the fuse inputs of the inverter. The voltage resistance must be at least 1000 V for inverters that are
equipped with an optional EVR. The SC100 is equipped with 3 DC inputs (see data sheet
Appendix B).
The cables are fed through the socket and the base of the cabinet. To do this, the base plates in the
front of the cabinet are opened and the cable pulled into the inside of the cabinet. Suitable cable
screw connections must be installed in the removable base plates to provide strain relief for the cable.
A variety of threaded joint sizes is provided for this purpose.
We also recommend an optimum protection level at the grid connection point by installing
combined overvoltage and lightning protection there as well.
Before measuring the insulation, the overvoltage protectors must be removed or
disconnected or the existing fuses must be removed!
We recommend using lightning and overvoltage protection for the external temperature
sensor and for both of the available analog inputs. This can be ordered as an option.
NOTICE!
When an external control voltage supply cable is connected, the lightning and overvoltage
protection at this voltage input is rendered useless! We therefore recommend the option of
retrofitting the device with combined lightning and overvoltage protection!
The grid structure, in particular the special feature of the TT grid must be observed.
The DC cables are connected directly to the busbar using M12 cable lugs. See the
electrical connection section in the table located in Appendix C.
NOTICE!
The DC cables to be connected must be rated for a minimum of 900 V. They must have a
voltage resistance of at least 1000 V for an optional EVR.