Solar panels basic knowledge and application case

- Jan 16, 2019-

Take an example today, suppose that a resident in Guangzhou has invested in a 5kW-scale family-type solar panel photovoltaic power station. The solar panel assembly per kilowatt covers an area of about 10m2 and covers an area of about 50m2. . The investment per kilowatt of power station is about 12 RMB, the total investment is 60,000 RMB, and the average annual power generation is 5,500 degrees.

 

Guangzhou has implemented the ladder price since July 1, 2012. The summer standard (May-October), the first gear is 260 degrees, the second gear is 261-400 degrees, and the 400-speed is the third gear; non-summer standards (In November, the first gear was 200 degrees, the second gear was 201-400 degrees, the third gear was 400 degrees or more, and the electricity price was 0.61 RMB/degree, 0.66 (up 0.05) RMB/degree, 0.91 (Up 0.3) RMB / kWh.

 

The following will be calculated on two assumptions:

 

Hypothesis 1: Household electricity consumption is not large, monthly electricity bills are in the first gear, self-use accounts for 60% of total photovoltaic power generation, Internet accounts for 40%, offsets residential electricity price of 0.61 RMB / kWh.

 

Investment income analysis: 1. Step-by-step calculation

 

(1) Power generation subsidies:

 

State subsidy: 0.42 RMB / kW × 5 500 degrees = 2310 RMB

 

Guangzhou subsidy: 0.1 RMB / kW × 5500 degrees = 550 RMB

 

Total: 2 310+550=2 860 (RMB)

 

(2) Expenses for self-use offsetting:

 

0.61 RMB / kW × 5500 degrees × 60% = 2013 RMB

 

(3) The grid calculates the on-grid electricity fee based on the purchase price of desulfurized coal and coal: 0.514 RMB / kW × 5 500 degrees × 40% = 1130.8 RMB

 

Total: 2 860+2 013+1 130.8= 6003.8 (RMB)

 

2. One-step calculation

 

Total income = (spontaneous self-use ratio × local electricity price + distributed photovoltaic power generation subsidy + Internet ratio x desulfurization coal-fired purchase price) × total power generation

 

= (60% ×0.61+0.42+0.1+40%×0.514) RMB / degree x 5500 degrees

 

= 6003.8 RMB

 

Payback period: 60 000/ 6003.8≈10 (years)

 

Hypothesis 2: Households use a large amount of electricity, and the third-rate electricity bill accounts for a large proportion each month. The electricity bill that can be offset by photovoltaic power generation is the third-rate electricity bill, and the photovoltaic power generation can be completely consumed by the household then it can be greatly improved.

 

Total income = (spontaneous self-use ratio × local electricity price + distributed photovoltaic power generation subsidy + Internet ratio x desulfurization coal-fired purchase price) × total power generation

 

= (100% × 0.91 + 0.42 + 0.1 + 0 × 0.514) RMB / degree × 5500 degrees

 

=7865 RMB

 

Payback period: 60 000/7 865=7.6 (years)

 

Solar panels photovoltaic power systems can be used for 25 years or even longer. From the perspective of the project life cycle, projects can generally recover costs in 7 to 10 years, with a remaining 15 to 18 years of net income. Therefore, regardless of the time value of funds, residential PV projects have certain economics.

 

From the perspective of residential PV projects that have been invested and built a month ago, investors are more concerned about solar panels photovoltaic power generation can save coal, reduce carbon dioxide emissions, and are environmentally friendly social benefits such as green and clean new energy. Building a home PV project reflects the investor's energy conservation and environmental protection concept and social responsibility.