Grounding Concept; Low-Temperature Option; Schematic Diagram - SMA SUNNY CENTRAL 500CP XT Installation Manual

SMA Solar Technology AG 3 Product Description

3.6 Grounding Concept

In accordance with the latest technology, the Sunny Central inverters are discharged to ground. As a result, leakage
currents to ground occur which must be taken into account when planning the PV system. The magnitude and distribution
of such leakage currents is influenced by the grounding concept of all the devices in the PV system.
SMA Solar Technology AG therefore recommends that when using e.g. cameras and monitoring technology, optical fiber
technology is used for the transmission of signals (see Section 13.2.2 "Setting up a System Network with Optical Fibers",
page 63). This will counteract possible interference sources.
The grounding of the Sunny Central and MV transformers in meshed design as recommended by
SMA Solar Technology AG reduces the level of leakage current.

3.7 Low-Temperature Option

With the "Low-temperature option", the temperature range is extended from ‒40°C to +62°C; however, the
Sunny Central will only maintain feed-in operation down to ‒25°C. If the ambient temperature falls below ‒25°C,
the Sunny Central switches to the operating state "Stop", communication is shut down and the auxiliary heating element
is activated. As soon as the ambient temperature exceeds ‒20°C, the Sunny Central resumes feed-in operation.

3.8 Schematic Diagram

Schematic diagrams in PDF format contain jump marks. By double clicking a jump mark, the display will change to the
corresponding current path or the referenced place in the equipment list.
SMA Solar Technology AG recommends using schematic diagrams in PDF format during installation. The schematic
diagrams in PDF format are available on request. Contact the SMA Service Line.
Installation Manual SCCPXT-IA-D7-en-42 17