Electrical connection and potential equalization

Danger

  • The plug contacts must not be disconnected or connected under load. Failure to observe this warning may result in DANGER TO LIFE!
  • Solar panels generate electrical energy when light falls on the front. A system with several solar panels can generate life-threatening voltages and currents! Do not touch the electrical connections or cable ends while the solar panel is exposed to light.
  • The installation of lightning protection is recommended in exposed locations. If lightning protection equipment is available, the solar panels must also be integrated. Observe the relevant regulations (e.g. EN 62305 and VDE 0100).
  • Solarwatt modules are equipped with high-quality solar cables and plug connectors that are protected against polarity reversal and contact. Only combine plug connectors if compatibility has been expressly declared by the manufacturer. Observe the rated voltage and the instructions for use of the manufacturer and plug connector model.
     
  • The string cable must be connected using the same connector manufacturer and type as the module connection cable. For this purpose, the module connectors may be removed and replaced at the beginning and end of the string and at points where the existing cables on the module are not sufficient. The permissible conductor cross sections and cable outer diameter ranges of the connector type and the connector manufacturer's Mounting instructions must be observed (more information in the manufacturer's declaration on cutting and replacing existing solar module connectors).
    You can find suitable cable sets, connectors, cables and installation accessories in the store on our website solarwatt.de.
     
  • When assembling solar cables yourself, only original tools from the respective manufacturer may be used.
     
  • Ensure that the connectors engage with an audible click.
     
  • The usual bending radii of at least 5 times the outer cable diameter must be observed.
     
  • It is recommended that the cables are laid securely so that they are not exposed to mechanical loads.
     
  • The cables and connectors must not be exposed to moisture and must not rest on the ground or floor.
     
  • For the maximum series arrangement of modules, the system voltage specified in the data sheet must be observed.
     
  • Without string fuse, the maximum parallel arrangement of module strings is two. Observe the value specified in the data sheet for the reverse current carrying capacity and only use standardized photovoltaic cables (recommendation: minimum cable cross-section 4 mm²).
     
  • The modules must not be operated permanently in short-circuit mode.
     
  • The modules comply with protection class II and can therefore be operated in systems with dangerous DC voltages (greater than 120 VDC according to IEC 61730). Modules of this protection class may be used in systems with unrestricted accessibility; the relevant regulations must be observed. Solarwatt modules that are qualified within this protection class in accordance with IEC 61730 meet the requirements of protection class II if the electrical installation complies with the regulations.
     
  • Under normal installation conditions, a solar panel can deliver a higher current and/or a higher voltage than under the standardized test conditions. 
     
  • To determine the rated voltage values of components, the rated current values of conductors, the size of fuses and for the dimensioning of control systems connected to the solar panels, the values of the short circuit current ISC specified on the solar panel should therefore be multiplied by a factor of 1.25 and the open circuit voltage UOC, based on the lowest ambient temperature to be expected at the respective installation site, by a factor of up to 1.25.
     
  • The potential equalization of the solar generator is already prepared at the factory and is recommended. This can be carried out using the existing punchings for potential equalization on the long sides of the frame (see illustration) or with corresponding earthing module clamps with mandrels in accordance with local legal regulations.
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