Application And Principle Of Solar Off-Grid System Solution

Application And Principle Of Solar Off-Grid System Solution

Off-grid photovoltaic power generation systems are widely used in remote mountainous areas, non-electric areas, islands, communication base stations and street lamps. The photovoltaic array converts solar energy into electric energy under the condition of light, and supplies power to the load through the solar charge and discharge controller, and charges the battery pack at the same time; when there is no light, the Lead acid battery pack supplies power to the DC load through the solar charge and discharge controller. At the same time, the battery also directly supplies power to the independent inverter, which is converted into alternating current through the independent inverter to supply power to the alternating current load.

Solar System Composition

(1) Solar Battery Modules
The solar cell module is the main part of the solar power supply system, and it is also the most valuable component in the solar power supply system. Its function is to convert the solar radiation energy into direct current electricity.

(2) Solar Controller
The solar charge and discharge controller is also called "photovoltaic controller". Its function is to adjust and control the electric energy generated by the solar cell module, to charge the battery to the maximum extent, and to protect the Maintenance Free Lead Acid Battery from overcharge and overdischarge. effect. In places with large temperature difference, the photovoltaic controller should have the function of temperature compensation.

(3) Off-grid Inverter
The off-grid inverter is the core component of the off-grid power generation system, which is responsible for converting DC power into AC power for use by AC loads. In order to improve the overall performance of the photovoltaic power generation system and ensure the long-term stable operation of the power station, the performance indicators of the inverter are very important.

(4) Battery Pack
The Sealed Maintenance Free Battery is mainly used for energy storage to provide electrical energy to the load at night or in rainy days. The Maintenance Free Battery is an important part of the off-grid system, and its pros and cons are directly related to the reliability of the entire system. However, the battery is a device with the shortest mean time between failures (MTBF) in the entire system. If the user can use and maintain it normally, its service life can be extended. Otherwise, its service life will be significantly shortened. The types of batteries are generally lead-acid batteries, lead-acid maintenance-free batteries and nickel-cadmium batteries. Their respective characteristics are shown in the table below.