How to Choose the Best Solar Panel Mounting Bracket Inclination and Spacing?

- Jul 25, 2018 -

How to get authoritative data such as optimal inclination?

These computing tools should be familiar

At present, residential roofs generally have two forms, one is a tiled roof with a slope, and the other is a cement flat roof.

In order to make maximum use of the roof area, the roof is generally installed by means of roofing. The orientation and inclination are determined by the roof condition. For the cement flat roof, in order to increase the power generation, the fixed solar panel mounting bracket installation method is generally adopted. There are also large differences in the design of the inclination and spacing of the brackets for different regions.

For household PV power plants installed with fixed solar panel mounting brackets, the choice of bracket inclination and spacing is critical to the power generation of the power station and needs to be cautious.

For example, the same component in a northwestern power station has a single-axis annual increase in power generation of more than 15%. In the case of the same fixed brackets in the south of Beijing, the difference in power generation under different dip angles is as high as 50% in winter, and the best inclination angle in the whole year is 15% higher than that in horizontal distribution!

Here's how to choose the best bracket tilt and spacing.

From the best received solar radiation, each region has a corresponding optimal inclination angle (corresponding to the maximum solar radiation received in the year). Generally, it can be calculated using a variety of software. For example:

Globalsolaratlas GSA is a PV query tool for global PV practitioners jointly launched by the World Bank organization and Solargis. It is easy to understand and suitable for PV optimal dip query, simple power generation query, irradiation information query, etc. High and authoritative in the industry.

1, the specific dip angle specific query method:

Open your browser and type, enter the location you want to query in the search bar, or directly select the map to display the simulated full-length duration, irradiation, temperature, and optimal tilt data. . As shown below:

Taking Shanghai as an example, we will automatically show the best local dip angle after selecting the location. Here, the best dip angle in Shanghai is 25 degrees.

2. Query method of photovoltaic bracket spacing

In general, the choice of the spacing of the brackets should comply with the requirements of the photovoltaic simulation arrangement of Section 7.2 of GB50797. as follows.

The arrangement of the photovoltaic support should be such that there is no shadow obscuration between 9 am and 3 pm local time in the local real sun.

A simpler calculation can be directly obtained by inputting the parameters such as inclination, slope length, and local dimension in the corresponding position of the table below through the formula in the "Photovoltaic Design Code".


The above is only the optimal solar panel mounting bracket design method under the theoretical situation. In fact, in the case of limited roof area, in order to maximize the profit, the installation tilt angle is generally reduced and the bracket spacing is reduced.

More detailed modeling simulations can be performed with more specialized tools such as PVSYST to determine optimal tilt and pitch.

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