6 points to pay attention to when installing rooftop photovoltaics. Installing photovoltaic modules on a flat roof in a flat manner seems to be the most natural way. Not only can the installation volume/area be maximized, but it is also possible to use photovoltaics as roof ceilings to increase space area.

但事實上，在平屋頂上安裝光伏，并不意味著您還應該將其傾斜度設置為0度，我們需要考慮很多因素，應避免平裝，包括：

But in fact, installing photovoltaic on a flat roof does not mean that you should also set its inclination to 0 degrees. We need to consider many factors and avoid flat installation, including:

平鋪組件容易積灰，積灰可能造成10％甚至30%的發電量損失；

Flat components are prone to dust accumulation, which may cause a 10% or even 30% loss of power generation;

清洗更不方便，積水不易流出；可能無法靠自然降雨來去除積灰；

Cleaning is more inconvenient, and accumulated water is not easy to flow out; It may not be possible to rely on natural rainfall to remove accumulated ash;

與傾斜安裝相比，發電量將減少；投資回報期將更長；

Compared to inclined installation, the power generation will be reduced; The investment return period will be longer;

傾斜安裝和純平鋪的光伏陣列發電量會有明顯的不同，通過對一個11.2kWp太陽能系統進行仿真模擬，傾角分別為10度、5度和0度。

There will be significant differences in the power generation between tilted and flat photovoltaic arrays. Through simulation of an 11.2kWp solar system, the tilt angles are 10 degrees, 5 degrees, and 0 degrees, respectively.

仿真結果表明，如果傾角為0度，則11.2kWp系統年發電量約為13,480.3kWh，而在5度傾角下，該系統一年發電量達到14,066.9kWh。而事實上，當傾角為10度時，該系統年發電量達到14,520kWh。

The simulation results show that if the inclination angle is 0 degrees, the annual power generation of the 11.2kWp system is about 13480.3kWh, while at a 5 degree inclination angle, the annual power generation of the system reaches 14066.9kWh. In fact, when the inclination angle is 10 degrees, the annual power generation of the system reaches 14520kWh.

從結果中可以看出，每增加5度，系統每年增加500kWh的發電量（15度后，增加量會明顯減少，超過佳傾角后反而會更低）。而且，上述仿真模擬還沒有考慮低傾角安裝時由于積灰而造成的發電量損失。

From the results, it can be seen that for every 5 degree increase, the system generates an annual increase of 500kWh of electricity (after 15 degrees, the increase will significantly decrease, but after exceeding the optimal inclination angle, it will actually be lower). Moreover, the above simulation has not yet taken into account the power generation loss caused by ash accumulation during low inclination installation.

建議如果不愿意采用佳傾角來安裝的話，安裝傾角盡可能還是高一些。如果必須平鋪，建議也將傾角設計在5-10度之間。對于平屋頂來說，5-10度的角度也已經足夠平了，而對于彩鋼瓦屋頂來說，一般都會留有3度以上的角度，相比增加傾角的額外成本來說，順其自然、隨坡就勢也是很好的選擇。

It is recommended that if you are not willing to use the optimal inclination angle for installation, the installation inclination angle should be as high as possible. If it is necessary to lay flat, it is recommended to also design the inclination angle between 5 and 10 degrees. For flat roofs, an angle of 5-10 degrees is already sufficient, while for colored steel tile roofs, an angle of more than 3 degrees is generally left. Compared to the additional cost of increasing the inclination angle, letting nature take its course and following the slope is also a good choice.

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This article provides assistance in installing photovoltaic systems on rental rooftops. For more related content, please click on http://www.51dwgw.cn I hope this article can be helpful to you. Thank you for reading!