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The choice of inverter depends on the country of the installation (see table 1):
•
in countries where functional grounding is required: inverter with galvanically isolated
transformers must be used
•
in countries where functional is not required: inverters with our without transformers can be
used.
Irrespective of the installation country, please follow the instructions for the use of inverters
with transformators as provided in the following section „Functional grounding.“
Also, refer to the specification and instructions as provided by the inverter manufacturer.
WARNING! Incorrect grounding may cause risk of fire hazard!
Direct grounding with a direct connection of pole and earth is prohibited.
Install a functional grounding to the DC side of the solar array, when:
•
you install in a country where functional grounding is required according to table 1
•
you use an inverter with transformator - irrespective of the installation country.
Ensure that the following requirements for a functional grounding are met:
•
a maximum of 50 module strings in the module array connected to the inverter,
•
the negative pole of the solar module array is to be connected to ground
and
•
the current through this ground connection must be limited to 10 mA in order to protect the
system from ground leakage current in the case of isolation failures (e.g. in case of module
glass breakage). One possibility to achieve this current limitation is by installing a 100 kOhm
resistor (considering 1000 VDC max system voltage) between the negative pole and ground.
Make sure to use an appropriate resistor (e.g., 10 W/ 1000 VDC, compatible with the inverter).
•
only inverters are used for which the manufacturer provides a ground kit complying with the
above provisions.
TABLE 1:
Allocation of functional grounding requirements to installation countries
FUNCTIONAL GROUNDING REQUIRED
FUNCTIONAL GROUNDING NOT REQUIRED
•
Albania
•
Bosnia and
Herzegovina
•
Bulgaria
•
France
•
Greece
•
Italy
•
Croatia
•
Macedonia
•
Moldova
•
Montenegro
•
Portugal
•
Romania
•
Russia
•
Switzerland
•
Serbia
•
Slovenia
•
Spain
•
Turkey
•
Ukraine
•
Hungary
•
Belgium
•
Denmark
•
Germany
•
Estonia
•
Finnland
•
Great Britain
•
Island
•
Latvia
•
Lithuania
•
Luxembourg
•
Netherlands
•
Norway
•
Poland
•
Sweden
•
Slovakia
•
Czech Republic
•
Belarus
Ground each of the framed modules with Parker screws (according to DIN 7981, material: A2,
size: 4.2 mm x 16 mm) to the grounding points indicated in Figure 1. Attach the screw as
shown in Figure 5.
FIGURE 5:
Attachment of the grounding
1
2
3
4
1
INVERTER
FUNCTIONAL GROUNDING
SAFETY GROUNDING
1 Stainless Parker screw
2 Stainless washer (cable lug)
3 Stainless serrated lock washer
4 Module frame
INSTALLATION AND OPERATION MANUAL FOR CIGS SOLAR MODULES Q-CELLS SE
