Wall-mounted solar water heaters should only be attached with special installation brackets. A base must be placed on the flat roof and the embedded parts for fixing must be reserved. be treated with anti-corrosion treatment; the foundation Once completed, waterproofing must be carried out. When installing, simply use bolts and other connecting parts to firmly connect to the installation bracket.
What are the requirements for installing solar collectors and photovoltaic panels on sloping roofs?
For solar power generation, the power output per square meter is about 120W, and the cost per square meter is about 1,500 yuan. The larger the area, the lower the price.
In 2013, the photovoltaic industry was the subject of European and American antitrust investigation. Overcapacity has led to the collapse of many photoflight industriestaiques in Zhejiang and solar energy prices have fallen. This can be checked online at any time.
If the solar panels produce electricity, it is recommended to launch group-wide tenders. The main reason is that energy transformation and storage equipment is very expensive, as well as the conversion rate. is as high as 17% to 20%. The efficiency is very low and it is not as good as photosynthesis.
Today, the national policy of supporting the production of clean energy and photovoltaic energy is more than 10 kw. can be connected to the grid for free, but the electricity price for electricity recovery is very low and the procedures are cumbersome.
Rooftop photovoltaic power generation with monthly sales of less than RMB 20,000 is tax-exempt. According to national tax and tax policies, households electricity producers must provide sales invoices to electricity supply companies, and buyers also need invoices. to offset costs. Individual electricity producers do not have industrial and commercial qualifications and the procedures for receiving invoices are complicated. Taxes above RMB 20,000 are halved.
“The inability to obtain invoices makes it more difficult for electricity-producing households to sell, which is not conducive to promotion. The document issued by the National Tax Administration will reduce the tax. burden on electricity-producing households. electricity production projects. If an electricity-producing household's monthly sales of electrical products exceeds RMB 20,000, the State Grid Corporation of China will issue an invoice. Companies affiliated with State Grid will collect a value added tax of up to50% of the tax to be paid. Those with monthly sales of less than 20,000 yuan are exempt from VAT.
According to the policy issued by the State Administration of Taxation last year, from October 1, 2013 to December 31, 2015, the tax rate is 3%. Taking Gao Song as an example, if his monthly sales are 30,000 yuan, the amount of tax he should pay is 30,000 yuan × 3% × 50% = 450 yuan.
For every kilowatt hour of electricity produced by residents, the state subsidizes 0.42 yuan; the state purchases unused self-generated electricity from residents based on desulfurized coal electricity prices, and the price is also 0.42 yuan per kilowatt hour. . Based on the average installation cost of 1 kilowatt of a distributed photovoltaic power generation system of about 10,000 yuan, if the average daily power generation of the 8 kilowatt system is 30 kilowatt hours and the idiotsHousehold electricity consumption is 5 kilowatt hours per day (not exceeding the first-level electricity price of 0.52 yuan), this will represent approximately a return on investment in 8 years.
According to the same calculation method, it will take 9 to 10 years for a 10 kilowatt distributed photovoltaic energy production device to recover its cost.
The average cost recovery period for domestic photovoltaic plants is between 8 and 10 years.
Size of embedded steel bars for roof solar panels
1 The slope of the roof should be combined with the solar collector and the optimal tilt angle for the panels photovoltaic systems receive sunlight is determined by the local latitude ±10°;
2. Heat collectors and photovoltaic panels on sloping roofs must be installed along the slope or installed high along the slope. ;
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3. The supPorts of solar collectors and photovoltaic panels installed on sloping roofs should be firmly connected to the embedded parts in the roof panels, and waterproof construction measures should be taken;< /p>
4. Rainwater drainage at the joint between the solar collector and the photovoltaic panel and the sloping roof must be smooth
5. The connection between the solar collector and the integrated photovoltaic panel; the sloping roof along the slope and the surrounding roof materials should be made with good waterproof structure treatment;
6. Solar collectors and photovoltaic panels are integrated on the sloping roof along the slope, as well as the overall thermal insulation, heat. the insulation, waterproofing and other functions of the roof should not be reduced;
7. The gap between the solar collector and the photovoltaic panel installed on the sloping roof along theslope and roof shall not be more than 100mm;
8. The pipe connecting the solar collector and the water storage tank on the sloping roof must pass. When constructing a pitched roof, the corresponding waterproof casing must be pre-buried and buried before the construction of the roof waterproof layer.
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The diameter is not less than 10 mm. The size and diameter of embedded steel bars for rooftop solar panels should not be less than 10mm. The overlap length should not be less than 12 times the diameter of the steel bar. to be used. The overlap length should not be less than6 times the diameter of the steel bar. Flat steel connections should be used. The cross section of flat steel is not less than 48mm2, the thickness is not less than 4mm. the welding overlap length should be more than twice the width of the flat steel and it should be welded on three sides.