The solar power generation system is composed of a solar battery pack, a solar controller, and a battery (group). If the output power is AC 220V or 110V, you need to configure the inverter. The role of each part is:
(1) Solar panels: Solar panels are the core of solar power systems and the most valuable part of solar power systems. Its role is to convert the solar radiation capacity into electrical energy, or send it to the battery for storage, or to drive the load. The quality and cost of solar panels will directly determine the quality and cost of the entire system.
(2) Solar controller: The function of the solar controller is to control the working state of the whole system and to protect the battery from over-charge protection and over-discharge protection. In places with large temperature differences, qualified controllers should also have temperature compensation. Other additional features such as light control switches and time control switches should be optional for the controller.
(3) Battery: Generally, it is a lead-acid battery. In a small and micro system, a nickel-hydrogen battery, a nickel-cadmium battery or a lithium battery can also be used. Its function is to store the electrical energy emitted by the solar panel when there is light, and then release it when needed.
(4) Inverter: In many occasions, 220VAC and 110VAC AC power supply are required. Since the direct output of solar energy is generally 12VDC, 24VDC, 48VDC. In order to supply electrical energy to 220 VAC appliances, it is necessary to convert the DC power generated by the solar power generation system into AC power, so a DC-AC inverter is required. In some cases, when a load of multiple voltages is required, a DC-DC inverter is also used, such as converting 24 VDC of electrical energy into 5 VDC of electrical energy (note that it is not a simple step-down).
Solar cell module structure and its performance requirements for the backplane
Generally, the glass-film-battery-film-TPT is laminated in the aluminum alloy frame. Since the solar cell module is an electrical product placed outdoors, the backboard must have 25 years of reliable insulation, water repellency and aging resistance in addition to its protective function. Table 1 lists a list of performance requirements for backplanes. One of the important indicators of these indicators for measuring the performance of solar panels is water vapor permeability. If the solar backing plate has poor performance of blocking water vapor permeation, the moisture in the air (especially the rainy and humid moisture) will enter the inner side through the solar backing plate, and the penetration of water vapor will affect EVA (ethylene-vinyl acetate). The bonding property of the copolymer) causes the backsheet to be detached from the EVA, thereby allowing more moisture to directly contact the cell sheet and oxidizing the cell sheet.
At present, the United States, European countries, especially Germany, Japan, India, etc. are vigorously developing solar cell applications, and the implementation of the "100,000 roofs" plan and the "million roof" plan have greatly promoted the development of the photovoltaic market. bright.
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