Renewable Energy System

FAQ CATEGORIES

Can solar power be generated on a cloudy day?

Yes, it can – solar power only requires some level of daylight in order to harness the sun’s energy. That said, the rate at which solar panels generate electricity does vary depending on the amount of direct sunlight and the quality, size, number and location of panels in use.

Who are the largest producers of solar power worldwide?

As of 2022, China is the largest producer of solar powered electricity generation in the world. The US comes in second, followed by Japan, Germany and India.

What are solar farms?

Solar farms, also known as solar parks or solar fields, are large areas of land containing interconnected solar panels positioned together over many acres, to harvest large amounts of solar energy at the same time. Solar farms are designed for large-scale solar energy generation that feed directly into the grid, as opposed to individual solar panels that usually power a single home or building.

How exactly is electricity from solar energy produced?

Solar panels are usually made from silicon, or another semiconductor material installed in a metal panel frame with a glass casing. When this material is exposed to photons of sunlight (very small packets of energy) it releases electrons and produces an electric charge.

This PV charge creates an electric current (specifically, direct current or DC), which is captured by the wiring in solar panels. This DC electricity is then converted to alternating current (AC) by an inverter. AC is the type of electrical current used when you plug appliances into normal wall sockets.

Is solar power a clean energy source?

Yes, solar power is a renewable and infinite energy source that creates no harmful greenhouse gas emissions – as long as the sun continues to shine, energy will be released.

The carbon footprint of solar panels is already quite small, as they last for over 25 years. Plus, the materials used in the panels are increasingly recycled, so the carbon footprint will continue to shrink.

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What are Building-Integrated Photovoltaics (BIPV)?

Building-integrated photovoltaics (BIPV) are dual-purpose: they serve as both the outer layer of a structure and generate electricity for on-site use or export to the grid. BIPV systems can provide savings in materials and electricity costs, reduce pollution, and add to the architectural appeal of a building. Though they can be added to a structure as a retrofit, the greatest value for BIPV systems is realized by including them in the initial building design. By substituting PV for standard materials during the initial construction, builders can reduce the incremental cost of PV systems and eliminate costs and design issues for separate mounting systems.

Building-integrated PV systems are planned during the architectural design stage and are added during initial construction. Building-added PV (BAPV) is planned and built during a retrofit. Both BIPV and BAPV lack the racks and mounting equipment of traditional PV systems. Most designers of integrated solar systems will consider a variety of solar technologies and their possible uses compared to the specific needs of building occupants. For example, semi-transparent thin-film PV can allow for natural day lighting and solar thermal systems can capture heat energy to generate hot water or provide space heating and cooling capacity.

Where can we install the distributed solar power generation system

Distributed solar power generation specifically refers to a distributed solar power generation system that uses photovoltaic components to directly convert solar energy into electricity. It is a new type of power generation and energy utilization method with broad development prospects. It advocates the working principles of nearby power generation, nearby grid connection, nearby conversion, and nearby use. It can not only greatly increase the power generation of photovoltaic power plants of the same scale, but also effectively solve the problem of power loss during the process of boosting and long-distance transportation. In the past months, China has released many policies to promote photovoltaic industry development and encourage distributed solar power system installation in the countrysides.

The most widely used distributed solar power generation system is a solar power generation project built on the roof of urban buildings. Such projects must be connected to the public power grid, and together with the public power grid, supply power to nearby users. Therefore, which places are suitable for installing distributed solar power generation systems?

1.Industrial plants: The roof area of the industrial plant is large, and the roof is open and flat, especially in plants with relatively large electricity consumption and relatively expensive online purchases, which are suitable for installing photovoltaic arrays. Moreover, due to the large electricity load, distributed photovoltaics generate electricity that users need, thereby saving users' electricity bills.

2. Commercial buildings: There are always cement roofs in most commercial buildings, which are more conducive to installing photovoltaic arrays. However, users often have requirements for the aesthetics of buildings. According to the characteristics of commercial buildings, office buildings, hotels, conference centers and resorts, the user load is generally higher during the day and lower at night, which perfectly matches the characteristics of photovoltaic power generation.

3. Agricultural facilities: There are a large number of available roofs in rural areas, including self-owned residential roofs, vegetable greenhouses, fish ponds, etc. The rural areas are often at the end of the public power grid and therefore the electricity quality is poor. Hence, the installation of distributed photovoltaic power generation systems in rural areas can improve the electricity quality and guarantee villagers can use the electricity freely.

4. Municipal and other public buildings: Due to strict management and complete system, the commercial behavior are relatively reasonable, and many users are willing to install the distributed power generation system. Besides, municipal and other public buildings are also suitable for centralized and contiguous construction of distributed photovoltaics.

5. Remote agricultural and pastoral areas and islands: Due to the long distance from the power grid, there are still millions of people not able to use electricity in remote agricultural and pastoral areas in Tibet, Qinghai, Xinjiang, the Nei Monggol Autonomous Region, Gansu, Sichuan and other provinces, as well as coastal islands in China. Off-grid photovoltaic power generation system or the micro grid power generation system is very suitable to be install in these areas.

In the near future, there will definitely be more and more distributed solar power generation system in the world for its various advantages and long lifespan.

Can distributed PV grid-connected systems be installed in agricultural greenhouses and fish ponds?

Greenhouse heating, heat preservation has been a key problem plaguing farmers, photovoltaic agricultural greenhouses are expected to solve this problem, due to the high temperature in the summer in the June-September months of many categories of vegetables can not be normal growth, and photovoltaic agricultural greenhouses, as in the agricultural greenhouses outside the addition of a spectrophotometer, which can be isolated from infrared rays, to prevent excessive heat into the greenhouses in the winter and the darkness of the night time and to prevent infrared wavelengths of light in the greenhouse to radiate outward to play the effect of heat preservation. In winter and at night, it can prevent the infrared band of light inside the greenhouse from radiating outward, and play a heat preservation effect. Photovoltaic agricultural greenhouses can supply the power needed for lighting in the agricultural greenhouses, and the remaining power can also be connected to the grid. In the off-grid form of photovoltaic greenhouses can be deployed with the LED system, daytime light blocking to ensure plant growth, while generating electricity. At night, the LED system applies daytime power to provide lighting. In fish ponds can also be erected photovoltaic arrays, ponds can continue to raise fish, photovoltaic arrays can also provide good shade for fish farming, a better solution to the development of new energy and a large number of land occupation of the contradiction, so the agricultural greenhouses and fish ponds can be installed distributed photovoltaic power generation system.

What’s the difference between solar PV panels and solar thermal panels?

Solar PV panels generate electricity, as described above, while solar thermal panels generate heat. While the energy source is the same – the sun – the technology in each system is different.

Solar PV is based on the photovoltaic effect, by which a photon (the basic unit of light) impacts a semi-conductor surface like silicon and generates the release of an electron. Solar thermal is less sophisticated and simply the direct heating of water (or other fluids) by sunlight. For domestic use, solar thermal panels are also installed on a roof facing the sun, heating water stored in a hot water cylinder and so providing hot water and heating. On a larger scale, solar thermal can also be used in power stations.

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