5.1.3 Under standard test conditions (1000W / m² irradiance, AM 1.5 spectrum, 25 ° C (77 ° F)
ambient temperature), the electrical performance parameters of modules, such as Isc, Voc, and
Pmax. Tolerance of rating Pmax is±3%, Voc and Isc is±5%.
5.1.4 A suitable installation location shall be carefully selected for modules.
5.1.5 In the northern hemisphere, modules had better be installed facing south direction; in the
southern hemisphere, modules had better be installed facing north.
5.1.6 The tilt angle of the PV module is measured between the surface of the PV module and a
horizontal ground surface (as shows in Figure 1). The PV module generates maximum output
power when it faces the sun vertical. If you want the specific information of best install tilt angle,
please consult the local authoritative solar system construction company.
Figure 1 PV module tilt angle
5.1.7 Modules shall be installed in the position of full sun exposure and not be obscured at any
time.
5.1.8 Generally, it is not recommended to be installed within 500 meters from the sea. The
modules, as a general rule, can guarantee 25 years of useful life when it is installed in where 3 km
away from the sea; if the installation site change to a place on a scale of 500m to 3000m from the
sea, the modules need to increase the special protection (such as thickening the thickness of the
oxide film of Aluminum metal alloy frame and the installation position must be processed with
anti-corrosion treatment).
5.1.9 When the battery is used in the photovoltaic system, the battery must be installed correctly
so as to protect the safe operation of the photovoltaic system. Battery installation, use and
maintenance shall be carried out in accordance with battery manufacturer's instructions.
5.2 Choosing the appropriate inverter