东方日升新能源股份有限公司
PV module installation and
maintenance manual
RISEN ENERGY CO.,LTD.
主导部门：组件研发中心
Page：NO.20 ,Total 41
backside.
Generally speaking, the reflectance is various with the different ground (See table
7-3), and this will lead to different power generation gain.
Table 7-3 reflectivity of different surfaces
The ground type
Water
Grassland
Ground
Sand
Snow
Reflectivity range
（
%
）
5-12
12 - 25
20- 33
20 - 40
20 - 40
80- 85
Due to the different ground clearance height will affect the power generation gain, it
is recommended to install the module at a height from 0.5m to 2m. See Fig. 7-2.
Fig. 7-2 Distance from the earth
When designing the system, in addition to the type of ground and the height above
the ground, the appropriate array spacing and how to avoid the back shadow should
be considered. Please refer to
《
Risen bifacial module PV system design white paper
》
,
or consult professional system designers.
8. Installation Guidelines
Ensure that the support system is strong enough and the modules must be fixed to the
support system as required
；
