Mounting systems for bifacial solar modules

Abstract

An improved design of a mounting system for solar modules without a support element, characterized by the front face of the solar modules (1) containing vertical gaps (2) and a horizontal gap between the solar modules (3). The purlins (5) are aligned with the frames of the bifacial PV modules (4). The mounting system is stable with short and long pile elements.

Description

Main claimMounting Systems for Bifacial Solar Modules. The front side shows three bifacial solar modules in a portrait arrangement (1) with vertical (2) and horizontal gaps (3) between the modules. This system is designed to minimize the shading on the back side (4) of the bifacial PV modules by sub-structural elements such as purlins (5), short (6) and long piles (7). The mounting system presented can improve the energy yield of bifacial solar modules and reduce the rear side shading by up to 8% compared to conventional mounting systems.Technical Field & Prior ArtThe present invention relates to the field of solar energy and power generation from photovoltaic (PV) solar modules. Solar modules have been used for many decades, in which only the front side has been used as the active surface; these PV modules are referred to as "monofacial solar modules". Conventional rear side multi-beam and purlin mounting systems have been used to install PV modules in open fields such as solar parks and PV power plants. With the recent introduction of bifacial PV modules that can generate power on both the front and back surfaces, conventional mounting systems cause severe shadowing on the back surface of the bifacial PV modules, thereby reducing the utility of these new modules. Bifacial PV modules can be used with solar trackers or fixed mounting systems. This work presents an improved fixed mount assembly system to reduce the shading on the back of bifacial PV modules and thus increase the power production of PV plants. There are some new improved mounting systems on the market where the beams have been rearranged or reduced to reduce shadowing on bifacial modules, but our products present a mounting system concept without beams, i.e. without using beams.DESCRIPTION OF THE PRESENT INVENTIONThe object is to provide a method for performing a processThe aim of this invention is to find a way to redesign the existing solar park assembly systems to make them more suitable and stable for bifacial PV modules. The new design should be able to reduce shadowing losses on the back side of the bifacial PV modules.SolutionThis invention solves the above problem by introducing a new design for mounting systems in which sub-construction elements such as beams, piles and piles are arranged differently. This new arrangement allows more reflected light to reach the back of the bifacial PV modules, thereby increasing energy production. For illustration we have outlined this solution with three modules in portrait format (one above the other). Unlike conventional mounting systems, our proposed solution eliminates the beams and positions the poles and poles so as to minimize the light blocked by these sub-structures which would otherwise reach the back of the bifacial PV modules. To achieve this, each solar module should have two purlins along its length on each side. In this way, the frames of the PV modules are aligned with the purlins, thereby avoiding interference with the active area of the bifacial PV modules. In our design, the length of the purlins corresponds to the combined length of three modules plus a distance of about 2 cm between the PV modules. In addition, a pile is used on each side of the bifacial PV module. Along the length of three modules in portrait format, two piles are placed to the right and left of the lower PV module and another two to the left and right of the upper PV module. This arrangement is repeated along the entire table.PretiltsAn advantageous embodiment of the invention is shown in Fig. 2, where a neat arrangement and very few shading elements are seen on the rear side. This invention requires some modifications to the existing mounting system concept which can result in a perceptible gain in energy yield of up to 0.6% depending on the location and configuration of the PV plant.List of reference characters1 Front side of the bifacial solar modules 2 Vertical distance between the solar modules 3 Horizontal distance between the solar modules 4 Rear view of the bifacial solar modules 5 Purlin elements 6 Short purlin elements 7 Long purlin elementsBRIEF DESCRIPTION OF THE DRAWINGSAn embodiment of the invention is illustrated in Figures 1 and 2. The figures show the following: FIG. 1 : shows a schematic illustration of the solar field from the front side. The solar panel consists of 10x3 bifacial PV modules, but in reality can be even longer. The front side (1) of three modules in portrait orientation is shown, (2) shows the horizontal spacing between the bifacial PV modules, and (3) highlights the vertical spacing between the bifacial PV modules. FIG. 2 : shows a schematic illustration of the rear side of the solar panel, which shows the active region of the solar module on the rear side ( 4). The bifacial PV modules are supported along their length by purlins (5). The short (6) and long (7) piles are driven into the ground to ensure the stability of the sub-construction.

Claims

Improved construction of mounting system for solar modules without a carrier element, characterized in that the front side of the solar modules (1) contains vertical gaps (2) and a horizontal gap between the solar modules (3). The purlins (5) are aligned with the frames of the bifacial PV modules (4). The mounting system is stable with short and long pile elements.According to claim 1 characterised in that the innovative mounting system has 3 solar modules in portrait format. The total width of the mounting system is about 7000 mm, but may vary depending on the width of the solar modules. The mounting system is also raised at least 500 mm above the floor, but may be higher or lower. The length of the mounting system may be 30000 mm or even longer.The arrangement of 3 solar modules according to claim 2, characterized in that the horizontal and vertical gaps (3) are defined at least 20 mm.The arrangement of sub-structural elements on the rear side of the solar modules according to claim 1 characterized in that the purlins (5) correspond to the frames of the PV modules; each PV module has a purlin on each side (left and right). A purette is divided between two successive PV modules. The purlins (5) do not cut the active area of the solar modules on the rear side.The arrangement of sub-structural elements on the rear side of solar modules according to claim 1 characterised in that the short piles (6) support the lower part of the mounting system, two short piles per PV module being present on each side (left and right). A short pile is shared between two adjacent PV modules.The arrangement of sub-structural elements on the rear side of solar modules according to claim 1 characterised in that the long piles (7) support the upper part of the mounting system, two long piles per PV module being protruding on each side (left and right). A long pile is shared between two adjacent PV modules.

Images