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2.6 Bifacial Module Arrangement and Layout Optimization
Generally, for normal modules’ array, there are 2 methods of module connection. The rst method connects
the upper module and the under module in series. The second method separates the upper and the under
modules. All upper modules connect in series, and all under modules connect in series separately. There is sig-
nicant height dierence between upper and under modules. The signicant height dierence lead to light illu-
mination dierence between upper and under modules. The light illumination dierence lead dierent working
current of the module. If choosing the rst method, the under module, which has lower working current, will
decrease the working current of the upper module. The decreasing of upper modules’ working current will
reduce the whole power generation of photovoltaic system. When choosing the second method, the upper
modules and the under modules have dierent working current. It can decrease power loss due to working
current mismatch, which improves the advantage of bifacial modules and increases whole power generation of
photovoltaic system. The light illumination rises with height increasing at the same outside surrounding. There-
fore, the upper modules have higher light illumination than the under modules. In order to declining the current
mismatch, we advise the second modules connection method. At the same time, please connect the upper/un-
der modules’ array to the dierent MPPTs of the inverter individually. This is the best method of modules’ array
connection for photovoltaic system.
3.1 Installation Safety
3.1.1 Wear protective headgear, insulating gloves and rubber shoes when modules are installed.
3.1.2 During installation, avoid standing on the modules, which will lead to damage of modules, or hazard hu-
man safety. Avoid unnecessary touching of modules. The surface and frame of modules may be very hot, which
may lead to burn or electric shock.
3.1.3 Don’t unpack the outside packing of modules except to install immediately. Avoid installing in rainy, snowy
or windy weather.
3.1.4 In order to reduce hazard of electric shock, if the junction box connecters are wet, stop installing.
3.1.5 During installing, do not throw anything, including modules and installation tools.
3.1.6 Please make sure connecting junction box correctly. Checking wiring status to ensure that all strong con-
nection without broken. Take adequate measure to avoid any scratch which may damage the cables or pressure
which may damage the module.
3.1.7 During installation or sunshine, avoid touching the junction boxes or connectors no matter what the mod-
ules are connecting with photovoltaic system or not.
3.1.8 Avoid pressing or putting something heavy on the module’s surface or distorting the module’s frame.
3.1.9 Avoid setting overweight things or hitting on the module’s surface glass, which may lead damage or micro-
crack of the solar cell.
3.1.10 Avoid cleaning the modules with sharp tools, which may lead to scratch on the surface of modules.
3.1.11 Avoid digging holes on the module’s frame without permission.
3.1.12 For BIPV or roof application, please installing in plan. Please follow the installation rules of “from top to
bottom” or / and “from left to right” as much as possible.
3.2 Modules Unpacking
3.2.1 When the modules arrival to destination, avoid unpacking modules in humid and rainy weather.
3.2.2 After unpacking, the modules should be placed horizontally. Avoid tilt, pressure, leaning on the wall of the
modules.
Figure 4 Optimization of modules’ array connection
INSTALLATION3
