16
with M4 nuts. Spring washers should be used to prevent the screws from loosening and lead to poor
grounding.
7.5.6
If the module is used in high-temperature and high-humidity environment, Sunerg Solar suggest the
customer configure the inverter which allows negative grounding and contains isolation transformer (as shown
in figure 7).
Figure 7 Schematic diagram for grounding potential of the inverter
7.5.7
Sunerg modules may be grounded using a third-party earthing device, provided that the earthing must be
reliable. The earthing device is operated in accordance with the manufacturer's requirements.
8 Maintenance and care
Modules need to be inspected and maintained regularly, especially during the warranty period. To ensure
optimum performance of the modules, the following maintenance measures are recommended.
8.1 Cleaning
When modules are working, there should not be environmental influence factors to cover shadows in the
modules, such as other modules, supporting rail, plants, large number of dust etc., which may directly reduce
the power output and may even cause regional hot–spot effect. Therefore clean the glass surface on a regular
basis, clean modules take measures so as:
a)
The frequency of the cleaning module depends on the rate of dirt buildup. Under normal conditions,
the rain will clean the surface of the module, but it is still need to regularly use a soft sponge or cloth
(dry or wet) cleaning modules. Any situation cannot use of rough surface materials to clean modules,
no use of acid and alkali cleaner to remove dirt.
b)
Avoid pressing part of the module hard during cleaning, which may cause glass deformation, cell
damage and reduction of the module’s life.
c)
Remove the snow covered on the module in time to avoid the module damage caused by long-term
accumulation of snow cover and freezing of melted snow.
d)
When cleaning the negative of the module needs to avoid piercing negative-sheet.
e)
It is recommended that modules be cleaned in the early morning or late afternoon when light is low
and the module temperature is low, especially for areas with high temperatures.
f)
Do not attempt to clean modules that are damaged by glass or have exposed electrical wiring, which
may be subject to an electric shock hazard.
8.2 Visual inspection
+1500
+750
+0
With negative Grounding
Volto
ge of st
ring t
o groun
d/V
