Solar Panel

Solar cell power generation and utility power in parallel
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Solar panels as the roof

With solar panels as the roof, the appearance is beautiful. Compare the indoor temperature difference between the rooms on the top floor with and without the shade of solar panels. In January in winter, when the sun is shining at 4:00 pm, the indoor temperature on the top floor is actually measured. The temperature of the room with shade is 26 degrees Celsius, and the room without shade is It is 28.5 degrees Celsius, and the temperature difference is 2.5 degrees. In the summer of May, at 7:00 pm on a sunny day, the indoor temperature on the top floor was actually measured. The temperature of the room with shade was 26.5 degrees Celsius, and the temperature of the room without shade was 31 degrees Celsius, with a temperature difference of 4.5 degrees.

It can be connected in parallel with the mains

. The solar cell generates direct current, which is converted into alternating current through the converter, and can be sold to Taipower through the connection of the alternating current meter.

Taking the central region of Taiwan as an example, it illustrates the current trend of solar power generation in Taiwan. The sunshine in the central region of Taiwan is between the north and the south, and the benefits of power generation are also between the north and the south. It is easy for those who are interested in making money from solar cells to generate electricity and do environmental protection to understand and make judgments.

At present, the average household in Taiwan consumes about 308 kWh of electricity per month. If the average daily electricity consumption is 10.3 kWh, and the average electricity bill announced by Taipower is NT$2.5855 per kWh, the average household will pay about 800 yuan per month.

In accordance with the "Renewable Energy Bulk Purchase Rates and Calculation Formulas for 101 Years of the Republic of China" stipulated by the Energy Bureau of the Ministry of Economic Affairs in accordance with Article 9 of the "Renewable Energy Development Regulations", July 1 to December 31, 2012 During the period, the price of the rooftop solar cell power generation system less than 10 kilowatts sold to Taipower is 9.251 yuan per kilowatt-hour. It is more cost-effective to sell solar cell power to Taipower than to use solar cell power.

According to the sunshine data from the Central Meteorological Administration of Taiwan in 2011, the total sunshine hours in central Taiwan is 1,842.1 hours, and the average daily sunshine hours are 1,842.1∕365=5.05 hours (including different sunshine intensity from morning to evening).

In order to conveniently calculate the power generation of the solar cell, the peak value is used to represent the maximum power of the system. The peak value represents the power generation when there is no shading and direct sunlight at noon (at this time, each square centimeter receives 0.1W of light intensity). According to the power generation characteristics of different solar cells, the average daily sunshine hours are converted into the noon sunshine hours relative to the peak value, and then multiplied by the power peak value is the power generation of the system on that day.

Taking the 8 kW peak polysilicon solar cell system in central Taiwan as an example, the average daily sunshine hours are 5.05 hours, and the relative noon sunshine hours are 3.6 hours when converted into peak values. The daily power generation is 8 kW multiplied by 3.6 hours, which is equal to 28.8 kWh, or 28.8 kWh. The annual power generation is 365 days multiplied by 28.8 kWh equals 10,512 kWh. The average annual electricity sales revenue of the system is 10,512 kWh × 9.251 yuan = 9,7246.5 yuan.

According to the price of the solar cell crash in 2012 and the price of the aluminum bracket, the construction cost of the solar cell power generation system is about NT$72,000 per kilowatt, and the cost of installing an 8-kilowatt peak system is about 576,000 yuan. 576,000 divided by 97,200 yuan of electricity sold every year equals 5.93 years, and the investment cost will be recovered in about 6 years.

Signed a 20-year contract with Taipower to sell electricity, and the converter was replaced every 6 years. Each 8 kW converter is about 80,000 yuan, and it is replaced once in the sixth and 12th years. The construction cost of the entire solar cell system in 20 years will increase to 600,000 plus 8×2 = 160,000 yuan, equal to 760,000 yuan Yuan.

Considering that the power generation efficiency of the polysilicon solar cell system decays by 1% per year, the accumulated power generation in 20 years is 10,512×(1+0.99+0.992+…+0.9919)=191,416 kWh of electricity, selling 9.251 yuan per kWh, totaling 1,770,789 yuan, Profit 177-76 = 1.01 million NT dollars. Without considering the inflation rate, the annual profit rate is 101∕20∕76=6.645%. Judging from the current annual interest rate of just over 1% for bank fixed deposits, it is quite a cost-effective investment.

Recyclable solar panels

Finally, recycling the scrapped solar panels on the roof of your home as a sunshade is not only beautiful and practical, but also saves the cost of roofing materials.

Without calculating the environmental cost (for example, without considering the environmental hazards of the greenhouse effect caused by the carbon dioxide emissions generated in the power generation process) and the current cost of solar cell power generation is still higher than the cost of traditional coal-fired power generation, the premium of solar cell power generation is sold to Taipower's subsidy measures can form an incentive for people to invest in solar cell power generation, and promote the vigorous development of Taiwan's midstream solar cell manufacturing industry and downstream solar cell system service industry.