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，屋顶的安装条件尤为重要，因为这将直接决定屋顶电站的安装容量。设计前需要注意的是屋顶的荷载计算，尤其是彩钢瓦屋面。当然，还有防水问题也是比较重要的。当然，寻找的安装公司，以上问题都相对比较好判断。同时，屋顶的采光一定要好，周围没有高大建筑。

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，屋顶光伏发电项目能否并网，也是决定是否安装的一个关键因素。项目是低压并网还是升压并网？厂房周边的变压器数量、变压器容量、变压器厂区布局、变压器电压等。当然作为业主来说，这些问题都是需要咨询的安装公司。

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，拿江苏地区为例，目前平价上网的工商业项目，回收年限大概在4~5年左右。当然回收年限除了考虑前期的投入成本与电站的平均发电量以外，电站的自发自用比例也同样重要。以上段落已经说过收益的组成，在此不继续详细解释。所以，一定考虑企业在此厂房下是否长期运营，是否短期内有跟换厂房，或重建的计划？企业是否有较大的用电需求，能够合理匹配屋顶电站的总发电量？当然，电站长期稳定的运行还需要有较高的安装要求、有保障且符合高质量的光伏配套产品、高效的运维服务等。再总结一句，在当下一般情况，凡是符合安装条件且能够保证较高的自发自用比列，在厂房屋顶安装太阳能发电系统，是合适的且能够为企业带来一定的经济收益。

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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