Solar photovoltaic system

Main features:

1, the use of single chip microcomputer and special software, to achieve intelligent control;

2, accurate discharge control using battery discharge rate characteristics correction. The final discharge voltage is a control point modified by the discharge rate curve, which eliminates the inaccuracy of simple voltage control overdischarge, and conforms to the inherent characteristics of the battery, that is, different discharge rates have different final voltages.

3, with overcharge, overdischarge, electronic short circuit, overload protection, unique anti-reverse protection and other automatic control; The above protection does not damage any parts and does not burn insurance;

4, using the series PWM charging main circuit, the voltage loss of the charging circuit is reduced by nearly half compared with the charging circuit using diodes, and the charging efficiency is 3%-6% higher than that of non-PWM, increasing the power consumption time; Overdischarge recovery of the lifting charge, normal direct charge, floating charge automatic control mode to make the system by a longer service life; At the same time with high precision temperature compensation;

5, intuitive LED light tube indicates the current status of the battery, so that users understand the use of the situation;

6. All controls are made of industrial-grade chips (only with I industrial-grade controller), which can operate freely in cold, high temperature and humid environment. At the same time, crystal timing control is used, and timing control is accurate.

7. The potentiometer adjustment control set point is cancelled, and the E-square memory is used to record each work control point, so that the setting is digitized, and the error of the control point is reduced by the vibration deviation and temperature drift of the potentiometer.

8, the use of digital LED display and setting, one-click operation can complete all Settings, the use of extremely convenient and intuitive role is to control the working state of the entire system, and the battery to play the role of over-charge protection, over-discharge protection. In places where the temperature difference is large, the qualified controller should also have the function of temperature compensation. Other additional functions such as light control switch and time control switch should be optional for the controller;

Rechargeable battery

The role of the battery is to store the electricity emitted by the solar panel when there is light, and then release it when needed. Solar battery is the application of "battery" in solar photovoltaic power generation, using lead-acid maintenance-free batteries, ordinary lead-acid batteries, colloidal batteries and alkaline nickel-cadmium batteries. The solar batteries widely used in China are mainly: lead-acid maintenance-free batteries and colloidal batteries, these two types of batteries, because of their inherent "maintenance-free" characteristics and less pollution to the environment, are suitable for reliable solar power systems, especially unattended workstations.

inverter

The direct output of solar energy is generally 12VDC, 24VDC, 48VDC. In order to provide electricity to 220VAC appliances, it is necessary to convert the direct current energy emitted by the solar photovoltaic system into alternating current electricity, so a DC-AC inverter is required.

Solar photovoltaic system

According to the electricity needs of the Shanghai World Expo Zero Carbon Pavilion project, the overall performance of the solar photovoltaic system is customized to optimize the energy saving effect and environmental protection effect. Traditional fuel sources of energy are declining day by day, and at the same time, about 2 billion people around the world do not have a regular energy supply. At this time, people have turned their attention to renewable energy, hoping that renewable energy can change the human energy structure and maintain long-term sustainable development. Among them, solar energy has become the focus of attention for its unique advantages. Abundant solar radiant energy is an inexhaustible, pollution-free and cheap energy source. Solar energy reaches the earth as high as 11.2×1016 KWH per second, if the earth's surface 0.1% of the solar energy into electricity, the conversion rate is 5%, then the annual power generation can reach 5.6×1012 KWH, equivalent to 40 times the world's energy consumption.

A power generation system that uses the photovoltaic effect of solar cells to convert solar radiation directly into electrical energy. Photovoltaic system for short.

Working principle

During the day, under light conditions, the solar cell module generates a certain electromotive force, and forms a solar cell array through the series and parallel of the module, so that the array voltage meets the requirements of the input voltage of the system. Then the battery is charged by the charge and discharge controller, and the electric energy converted from the light energy is stored. At night, the battery pack provides input power to the inverter. Through the function of the inverter, the direct current is converted into alternating current, which is transmitted to the distribution cabinet, and the power is supplied by the switching function of the 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 be limited load protection and lightning protection devices to protect the over-load operation of the system equipment and avoid lightning strikes, and maintain the safe use of the system equipment.