Actual case description

Because the photovoltaic power station is built on the roof, it can also save land costs. Usually in Hubei Province, the cost of rooftop photovoltaic power plants is between 8- 12 yuan per watt. The specific price is decided by the user after consultation with the photovoltaic company.

The above is a breakdown of the cost of building a rooftop photovoltaic power station. We use an actual case to further illustrate the expenditure details of rooftop photovoltaic power station. Analysis of the actual investment list of a 200KW industrial and commercial roof after grid connection.

Cost-benefit analysis of household solar photovoltaic power generation system

economic benefits

The final price of a 200KW industrial and commercial roof is 1.9928 million yuan, which is almost calculated according to the price of 10 yuan/watt.

Then someone will definitely say, is this project worth it? Let's calculate the economic account.

This roof generates electricity at 8: 00-17: 00 every day. At present, the electricity price is 1.2 yuan, with the state subsidy of 0.42 yuan and the selling price of 0.478 yuan. We assume that 80% of the electricity generated by photovoltaic power plants is for personal use and 20% is sold.

Power saving: annual power generation x self-use ratio x (state subsidy+electricity price)

Sales revenue: annual power generation x sales ratio x (state subsidy+on-grid tariff)

Then, the calculation result is as follows:

Power saving: 200,000 * 0.8 * (0.42+1.2) = 259,200 yuan.

Revenue from electricity sales: 200,000 * 0.2 * (0.42+0.478) = 35,920 yuan.

Payback period:1992800/(259200+35920) = 6.7 years.

After 6.7 years of cost recovery, the system can still run for 13 years, which is a net benefit. And if there are provincial subsidies or municipal subsidies, the cost recovery will be faster.

From the above calculation, it can be seen that rooftop photovoltaic power station has significant economic benefits for industrial and commercial roofs. Roof photovoltaic power generation is still a good investment project if there is a local subsidy policy.

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Matters needing attention

The data are all calculated from theoretical values. The details need to be calculated by a professional program, but they are all similar.

If there is a local subsidy policy, the recovery cost will be shorter and the income will be greater. Recommend conditional industrial and commercial roof construction.