Photovoltaic modules to be tested shall be properly labeled. The rear surface of the photovoltaic module shall have a nameplate as shown in Fig. 1. Each nameplate should contain information about:

• module producer,
• module type and series number,
• module dimensions,
• production date,
• voltage value at MPP and \( V_{oc} \) given in volts,
• maximum system voltage that the module insulation is rated for,
• current rating of the fuse,
• maximum power in watts,
• power tolerance in percent,
• the measurement conditions for which the electrical parameters of the module are specified,
• information about certificates and standards that the module meets.

The technical documentation shall include information on the power rating of the installation, information on the manufacturer, model and number of modules and inverters, dates of installation and commissioning, as well as information on the installer and the address of the installed system. The documentation should also include information about the company that designed the installation and its diagram. An important part of the documentation is to specify safety systems and how to behave during a failure of the photovoltaic installation. Requirements for labeling, preparation of technical documentation, as well as how to select modules for testing are specified in UL 4730 Ed. 1 (2017) "Labeling, Technical Data, and Sampling Requirements for Photovoltaic Modules", while not addressing systems with light concentrators, CPV. The standard specifies requirements for the manufacturer regarding:

• method of determining the number of modules to determine their rated power,
• information to be included in the technical documentation and on the nameplate,
• information to be placed on the technical documentation and on the nameplate, regarding the tolerances of the nominal parameters placed on the nameplate,
• conditions for which the electrical parameters of the modules are determined.

The standard EN 50380:2017 "Requirements for marking and documentation of photovoltaic panels" specifies what information should be included in the technical documentation of the panel. The standard obliges to label the panel permanently, specify the rated parameters and indicate how to use it safely and correctly. On the other hand, the standard EN 50461:2015 "Solar cells - Product information sheet and parameter specification for crystalline solar silicon cells" determines what information should be provided regarding the technical data and parameters of monocrystalline and multicrystalline silicon cells, which determine the optimal and safe production of photovoltaic modules.