REFU Elektronik GmbH REFUsol 40K / 46K-MV 27
NOTICE
To ensure the
IP65
protection class, use the provided connection housing. To
prevent any penetration of moisture and dirt, unused inputs and outputs must be
properly closed.
Failure to do so could void your warranty!
The following mains systems are allowed:
• TN-C-S-Net
• TN-S-Net
The connection to the power supply must be via a 5-wire line. For safety reasons, the PE protective
conductor must always be connected.
The power supply line must be equipped with an appropriate line protection. More information regarding the
power connection you will find in the Technical Data. Reducing factors must be taken into account if circuit
breakers are connected in series. Always observe the following standards:
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 FNN Technical Guidelines
The respective national standards, technical regulations and local installation and connection requirements
are complied with.
• Check the line voltage. It must be within the technical data for that device. If the line voltage is different,
contact your local network operator.
• The design and the cross-section of the mains connection cable must be chosen in such a way that they
can withstand the expected requirements during operation and the line losses are as low as possible. The
following points must be observed:
• The cable material must be selected according to the installation location, the type of installation, and
according to the national regulations.
• A strain relief must be installed for the mains supply.
4.11
Grid Line Impedance
For better efficiency, large line cross-sections in single cables are increasingly used for power supply lines,
especially if local conditions require long supply lines.
In large-scale plants, it is recommended as a best practice to locate the inverters in close proximity to the
step-up transformer. If the inverters are located in a decentralized fashion, with long distances to the
transformer, the higher AC cable inductance can lead to increasing line impedances. This can lead to voltage
distortions and error messages with regards to:
• Grid overvoltage (long cable)
• Increased operating noise of the inverters (short cable)
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