One reason is that the output power is relatively small. Generally speaking, the capacity of a distributed photovoltaic power generation project is within a few kilowatts. Unlike centralized power plants, the size of photovoltaic power plants has little impact on power generation efficiency, and therefore has little impact on their economy. The investment return rate of small photovoltaic systems is not lower than that of large ones.

Secondly, it has minimal pollution and outstanding environmental benefits. Distributed photovoltaic power generation projects generate no noise and do not pollute the air and water during the power generation process.

Thirdly, it can alleviate the local electricity shortage to a certain extent. However, the energy density of distributed photovoltaic power generation is relatively low, with a power of only about 100 watts per square meter of distributed photovoltaic power generation system. In addition, the limited roof area of buildings suitable for installing photovoltaic modules cannot fundamentally solve the problem of electricity shortage.

Fourthly, it is possible to generate and use electricity simultaneously. Large scale ground power stations generate electricity by boosting and connecting to the transmission grid, operating solely as power generation stations; Distributed photovoltaic power generation is connected to the distribution network, where power generation and consumption coexist, and it is required to be consumed locally as much as possible.