Flat roof solar mounting system installed household power generation systems generally consist of a photovoltaic array composed of solar cell components, solar charge and discharge controllers, battery packs, off-grid inverters, DC loads, and AC loads. If the output power is AC 220V or 110V, an inverter is also required. The photovoltaic array converts solar energy into electrical energy when there is light, and then supplies power to the load through the solar charge and discharge controller, and at the same time charges the battery pack; when there is no light, the battery pack supplies power to the DC load through the solar charge and discharge controller. At the same time, the storage battery also needs to directly supply power to the independent inverter, and the independent inverter is inverted into alternating current to supply power to the alternating load.

In the bracket installation method, the battery assembly is supported by a metal frame and presents a preset inclination angle. For the square array installed with brackets, the brackets are fixed on the roof with screws. This installation method will cause problems such as increased roof load-bearing and wind stress. However, since the air flow path completely surrounds the battery assembly, the assembly can maintain a relatively low operating temperature, thereby improving efficiency. Some bracket installation methods can adjust the inclination angle according to the season to improve the efficiency of the photovoltaic system.

Solar power and flat roof solar mounting can be installed on the roof of the villa.

The energy of solar energy is energy from celestial bodies outside the earth (mainly solar energy). It is the huge energy released by the fusion of hydrogen nuclei in the sun at ultra-high temperature. Most of the energy needed by human beings comes directly or indirectly from the sun. Fossil fuels such as coal, oil, natural gas and so on that we need for life are all because plants convert solar energy into chemical energy through photosynthesis and store them in plants, and then they are formed by plants and animals buried in the ground over a long geological age. In addition, water energy, wind energy, wave energy, ocean current energy, etc. are all converted from solar energy.

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 subject to anti-monopoly investigations in Europe and the United States. Overcapacity caused a large number of photovoltaic industries in Zhejiang to close down, and solar prices fell and fell. This can be checked online at any time

It is recommended to purchase solar water heaters at a price of 150-180 yuan per unit, including other costs such as materials, materials, etc., and buy and choose whether there is a reliable after-sales service in the local area.

For solar panel power generation, the proposed bidding for the group scale is mainly because the power transformation and storage power equipment is very expensive, and the conversion rate is as high as 17%-20%. The efficiency is very low, and it is not as good as plant photosynthesis.

At present, the national clean energy and photovoltaic power generation support policy is that more than 10kw can be connected to the grid for free, but the price of electricity recovery is very low and the procedures are cumbersome.

The monthly sales of rooftop photovoltaic power generation is less than 20,000 yuan, which can be tax-free. According to the national fiscal and taxation policy, power generation households need to provide sales invoices to power supply companies, and buyers also need invoices to offset the cost, and personal power generation does not have the qualifications of industrial and commercial owners. Complicated. Taxes are halved for more than 20,000 yuan

"Failure to get invoices will increase the difficulty of power generation sales, which is not conducive to promotion. The publication of the State Administration of Taxation will reduce the tax burden of power generation customers."

According to a document from the State Administration of Taxation, since July 1, 2014, the State Grid Corporation of China will purchase power products from distributed photovoltaic power generation projects. Value-added tax is collected on behalf of 50% of the tax payable. The monthly sales of less than 20,000 yuan can be exempted from value-added tax.

According to the policy issued by the State Administration of Taxation last year, from October 1, 2013 to December 31, 2015, the levy rate is 3%. Take Gao Song as an example. If one month's sales are 30,000, then the tax he should pay is 30,000 × 3% × 50% = 450 yuan.

For every kWh of electricity generated by residents, the state subsidizes 0.42 yuan; the state purchases unused self-generated electricity at the price of desulfurized coal, and the price is also 0.42 yuan per kWh. Based on the installation and use of a distributed photovoltaic power generation system, the average installed cost of 1 kilowatt is about 10,000 yuan. If the average daily power generation of the 8-kilowatt system is 30 kWh and the household power consumption is 5 kWh per day (no more than 0.52 yuan for the first gear), approximately Recover the investment in 8 years.

According to the same calculation method, it takes 9-10 years to recover the cost of a 10 kilowatt distributed photovoltaic power generation device.

The price of solar roof photovoltaic power generation system is about 3W yuan. The solar roof photovoltaic power generation system forms a solar cell array through the series and parallel connection of components, so that the voltage of the square array meets the requirements of the input voltage of the system. Then charge the battery through the charge and discharge controller, and store the electric energy converted from light energy. In the evening, the battery pack provides input power for the inverter. Through the function of the inverter, the DC power is converted into AC power, which is transmitted to the power distribution cabinet, and the power is supplied by the switching function of the power distribution cabinet. The discharge of the battery pack is controlled by the controller to ensure the normal use of the battery. The photovoltaic power station system should also have limited-load protection and lightning protection devices to protect the overload operation of the system equipment and avoid lightning strikes, and to maintain the safe use of the system equipment. Solar → Electricity → Chemical Energy → Electricity → Light Energy.

As a kind of clean, environmentally friendly and renewable energy, solar energy should not be underestimated in the future social development.