综上安装电站所在地光照资源越好、居民电价越高、居民每月用电量越大，光伏的成本回收年限越短，收益也就越多。在没有补贴的情况下，会多一年回本。但是随着安装成本降低，回收年限还会继续减少，越来越对百姓有益。

With the progress of photovoltaic power generation technology, the cost of photovoltaic power generation is gradually reduced.Many families are also installed on their roofs with photovoltaic power stations. Photovoltaic power generation is not only the choice of industrial and commercial plants, but also into thousands of households, so that people also use clean and green energy.

How about the investment and income of the photovoltaic installation? We then explain!

Because the installed capacity of households is small, the cost of a single tile is relatively high compared to the industry and commerce.The household photovoltaic power generation system is composed of modules, inverters, AC and DC cables, distribution cabinets, two-way electricity meters, etc.

Photovoltaic modules are the core of photovoltaic power stations, which can directly convert the energy of sunlight into electric energy. At present, the best photovoltaic modules can have a lifespan of 30 years, and the price is around 1.8 yuan /W (single crystal) (the price in December 2020).

Inverter is an important part of a photovoltaic power station, which converts the direct current generated by the modules into alternating current. The cost of the household photovoltaic equipment is 0.3 yuan /W.

Cost of other power stations: construction fee 0.5 yuan /W, cable 0.2 yuan /W, grid-connected equipment 0.5 yuan /W, application and installation grid-connected fee 0.5 yuan /W, design fee 0.1 yuan.

In summary, the general investment cost of power station is about 4 yuan /W, and the total investment cost of installing an 8kW power station is 32,000 yuan, including the other auxiliary materials, freight and taxes.

What happens to the customer when they install a power station? Read on.

The general user benefit is the sum of the electricity saved after installing the power station and the income from selling the unused electricity to the grid. If there is photovoltaic subsidy in the region, there is also a subsidy income.

Firstly, the annual effective utilization hours of optical resources in the three types of regions (Jiangsu, Zhejiang, Shanghai and Anhui) were calculated at 1100h. In 2020, the photovoltaic subsidy price will be 0.08 yuan/kWh.Residential electricity consumption in Jiangsu is 0.54 yuan/kWh. It is estimated that 60% of the electricity generated by PV in a household will be used by itself and 40% will be sold to the grid. (It depends on the monthly electricity consumption of the household)

The average annual generating capacity of the 8KW power station is 8,800 kWh, and the annual generating capacity is 220,000 kWh in 25 years. The average annual saving is 8,800 *60%*0.54= 2,851 yuan, and the cost of selling it to the State Grid is 8,800 *40%*0.391= 1,376.32 yuan. The annual subsidy cost is 8,800 *0.08=704 yuan. Total annual average income = electricity saving + electricity selling + subsidies =4931.52 yuan.The total income of 25 years is 123,200 yuan. The initial investment is 32,000 yuan (excluding loan interest rate and tax), the capital will be repaid in 7 years, and the net income will be 91,200 yuan.

If there is no subsidy for 20221, the annual income will be 4,227 yuan, the total income will be 105,000 yuan in 25 years, and the net income will be 73,000 yuan in 8 years.

In summary, the better the lighting resources at the location where the power station is installed, the higher the residential electricity price, and the larger the monthly electricity consumption of residents, the shorter the cost recovery period of photovoltaic, and the greater the income. In the absence of subsidies, it will pay back one more year.But as the cost of installation decreases, the recycling period will continue to decrease, which is more and more beneficial to the people.