Firstly, if the property rights of the factory are clear and belong to the enterprise under the roof, then the problem is relatively simple and can be operated according to the normal process. (The specific application process can be consulted with local power grid companies.) So, what if the roof property belongs to someone else (rented by a company)? In this situation, Xiaogu does not recommend enterprise investment. In general, this situation is invested and constructed by third-party investors or EPC companies with certain financial strength, and then signed energy management contracts with enterprises under the roof to sell electricity to them. Before constructing the power station, sign a lease agreement with the roof owner.

第二，屋頂的安裝條件尤為重要，因為這將直接決定屋頂電站的安裝容量。設計前需要注意的是屋頂的荷載計算，尤其是彩鋼瓦屋面。當然，還有防水問題也是比較重要的。當然，尋找的安裝公司，以上問題都相對比較好判斷。同時，屋頂的采光一定要好，周圍沒有高大建筑。

Secondly, the installation conditions of the roof are particularly important, as this will directly determine the installation capacity of the rooftop power plant. Before design, it is important to pay attention to the load calculation of the roof, especially the colored steel tile roof. Of course, waterproof issues are also quite important. Of course, looking for a professional installation company makes it relatively easy to judge the above issues. At the same time, the lighting on the roof must be good, and there are no tall buildings around.

第三，屋頂光伏發電項目能否并網，也是決定是否安裝的一個關鍵因素。項目是低壓并網還是升壓并網？廠房周邊的變壓器數量、變壓器容量、變壓器廠區布局、變壓器電壓等。當然作為業主來說，這些問題都是需要咨詢的安裝公司。

Thirdly, whether rooftop photovoltaic power generation projects can be connected to the grid is also a key factor in determining whether to install them. Is the project connected to the grid at low voltage or at high voltage? The number of transformers, transformer capacity, layout of transformer factory area, transformer voltage, etc. around the factory building. Of course, as an owner, these issues require consulting with a professional installation company.

第四、五，拿江蘇地區為例，目前平價上網的工商業項目，回收年限大概在4~5年左右。當然回收年限除了考慮前期的投入成本與電站的平均發電量以外，電站的自發自用比例也同樣重要。以上段落已經說過收益的組成，在此不繼續詳細解釋。所以，一定考慮企業在此廠房下是否長期運營，是否短期內有跟換廠房，或重建的計劃？企業是否有較大的用電需求，能夠合理匹配屋頂電站的總發電量？當然，電站長期穩定的運行還需要有較高的安裝要求、有保障且符合高質量的光伏配套產品、高效的運維服務等。再總結一句，在當下一般情況，凡是符合安裝條件且能夠保證較高的自發自用比列，在廠房屋頂安裝太陽能發電系統，是合適的且能夠為企業帶來一定的經濟收益。

Fourthly and fifthly, taking the Jiangsu region as an example, the current affordable online industrial and commercial projects have a payback period of approximately 4-5 years. Of course, in addition to considering the initial investment cost and the average power generation of the power station, the proportion of spontaneous self use of the power station is also equally important. The composition of revenue has already been mentioned in the above paragraphs, and we will not continue to explain it in detail here. So, it is important to consider whether the enterprise will operate under this factory for the long term, and whether there are plans to replace or rebuild the factory in the short term? Does the enterprise have a significant electricity demand that can reasonably match the total electricity output of rooftop power plants? Of course, the long-term stable operation of the power station also requires high installation requirements, guaranteed and high-quality photovoltaic supporting products, and efficient operation and maintenance services. To summarize, in the current general situation, installing a solar power generation system on the roof of a factory building that meets the installation conditions and can ensure a high spontaneous self use ratio is appropriate and can bring certain economic benefits to the enterprise.

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