Chapter 3: Installation of the inverter
SolarEdge Installation Guide - MAN-01-00060-2.6
23
Connecting to the inverter chains
Connect the system to the DC input pairs. If necessary, connect additional strings in parallel with a grouping box /
connection cables before connecting them to the inverter.
NOTE :
Making functional electrical earth of the negative pole or positive DC side is prohibited because the inverter has no transformer. The connection
to the land of module frames and mounting equipment for PV modules is admitted ..
NOTE :
The fixed input voltage SolarEdge architecture allows parallel channels being of different lengths. Therefore, they do not need to have the same
number of power optimizers, as the length of each string is within the allowed limits.
Connect the DC connector of each string to the DC + and DC- connectors according to the labels on the inverter.
Figure 13: DC connections of the inverter
Selecting a residual current device
SECURITY ELEMENT IMPORTANT:
All SolarEdge inverters incorporate a residual current device (RCD) internal certified to provide protection against possible risks of electric shock and
fire in case of malfunction of the solar module, cables or inverter. There are two triggers for RCD as required for certification (DIN VDE 0126-1 -1).
The default value for the protection against electric shock of 30 mA, and a current of 300mA slow growth.
If an external RCD is required by local regulations, check the type of RCD required by the local electrical code. SolarEdge
recommends using a type-A RCD. The recommended value of the RCD is 100mA or 300mA unless a lower value is
required by the local power grid. When required by local regulations, the use of an RCD type B, is permitted. In
installations where the local electric network requires the use of an RCD reduces leakage, parasitic capacitive discharge
current will trigger RCD. Use the following steps to avoid this problem:
•
Select an appropriate RCD to ensure proper operation of the installation. A 30mA RCD can also trigger at 15 mA
(in accordance with IEC 61008). Good quality RCD to ring at a higher value.
•
PV modules with low stray capacitance on the chassis are preferable. For more detailed information, refer to the
Application
PV modules with low stray capacitance on the chassis are preferable. For more detailed information, refer to the
Application
Note selecting RCD for SolarEdge inverters,
available on the website of SolarEdge
http://www.solaredge.com/files/pdfs/seapplication-rcd-selection.pdf.
Note selecting RCD for SolarEdge inverters,
available on the website of SolarEdge
http://www.solaredge.com/files/pdfs/seapplication-rcd-selection.pdf.
Note selecting RCD for SolarEdge inverters,
available on the website of SolarEdge
http://www.solaredge.com/files/pdfs/seapplication-rcd-selection.pdf.