In order to reduce carbon emissions and protect the environment, countries are promoting new energy power generation, including solar energy, Wind energy, geothermal energy, etc. Catalyzed by the energy crisis, the demand for photovoltaic energy storage has grown rapidly.
Solar energy storage system is a system that uses solar energy for power generation and energy storage. It consists of two major devices: photovoltaic equipment and energy storage equipment. The photovoltaic equipment absorbs solar energy and converts it into electrical energy, and the energy storage equipment stores the electrical energy generated by the photovoltaic equipment. , when the power of the photovoltaic system is insufficient, the energy storage system will convert the stored electric energy into the required AC power supply network through conversion. It is divided into Solar off-grid energy storage systems, Hybrid grid energy storage systems, and micro-grid energy storage systems. Next, let’s take a look at how they solve the electricity problem for customers.
Solar off-grid power generation system
Photovoltaic off-grid power generation system operates independently without relying on the grid. It is used in remote mountainous areas, areas without electricity, islands, communication base stations, street lights and other application places. The system consists of a photovoltaic array, a solar controller, an inverter, a battery pack, and a load. The photovoltaic array converts solar energy into electrical energy when there is light, and the solar energy controls the inverter integrated machine to supply power to the load and charge the battery pack at the same time; when there is no light, the battery supplies power to the AC load through the inverter.
Photovoltaic off-grid power generation system is specially designed for use in areas without grid or areas with frequent power outages. It is a rigid demand. The off-grid system does not depend on the grid and relies on the working mode of “storage while using” or “storage first and use later”. , for households in areas without grids or areas with frequent power outages, off-grid systems are very practical.
Hybrid grid energy storage system
Hybrid grid energy storage system are widely used in places where there are frequent power outages, or photovoltaic self-use cannot be connected to the grid, the price of self-consumption electricity is much more expensive than the electricity price of the grid, and the peak electricity price is much more expensive than the valley electricity price.
Photovoltaic power is given priority to user loads. If there is any surplus, it will be stored in the battery. When the photovoltaic energy is not enough, the battery and photovoltaic will supply power to the load together. If there is no photovoltaic power generation, all will be powered by the battery. The battery voltage reaches the low-voltage protection value. The system will switch to the mains to supply power to the load; the charging and discharging time of the battery can also be set by using the difference in peak and valley electricity prices. This system will minimize the use of grid power and save electricity bills.
Micro-grid energy storage system
Photovoltaic power is given priority to user loads. If there is any surplus, it will be stored in the battery. When the photovoltaic energy is not enough, the battery and photovoltaic will supply power to the load together. If there is no photovoltaic power generation, all will be powered by the battery. The battery voltage reaches the low-voltage protection value. The system will switch to the generator to supply power to the load; this kind of micro-grid system is mostly used in remote villages and islands without grid conditions.
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