Energy storage batteries are indispensable in off-grid systems. The solar panels charge the energy storage batteries through the controller, and the iron lithium batteries are inverted and output through the off-grid inverter for users to use. The energy storage batteries are in the photovoltaic off-grid system. The more commonly used ones are lithium iron phosphate batteries, lead-acid batteries, etc.
Photovoltaic modules, off-grid inverters (including photovoltaic chargers/inverters), energy storage batteries (lead-acid/colloidal/lead carbon/ternary lithium/lithium iron phosphate, etc.), photovoltaic brackets, cables, and accessories Electrical boxes, etc., are important components of photovoltaic off-grid systems. The biggest difference between photovoltaic off-grid systems and grid-connected systems is that the grid-connected system takes investment income as the calculation premise, while the off-grid system takes power supply as its basic requirement, so they have different priorities when selecting components.
Why should photovoltaic off-grid systems be equipped with energy storage lithium iron phosphate batteries? In photovoltaic off-grid systems, energy storage lithium iron phosphate batteries account for a large proportion, and their cost is similar to that of solar modules, but their lifespan is much shorter than that of components. The task of energy storage lithium iron phosphate batteries is to store energy and ensure stable system power at night or at night. Ensure load power on rainy days.
- Photovoltaic power generation time and load power consumption time are not necessarily synchronized. In a photovoltaic off-grid system, the input is the component used for power generation, and the output is connected to the load. Photovoltaics generate electricity during the day, when there is sunlight. The power generation is usually highest at noon, but at noon, the demand for electricity is not high. Many household off-grid power stations only use electricity at night. What to do with the electricity generated during the day? First, store energy. This power storage device is an energy storage lithium iron phosphate battery. Wait until the peak time of electricity consumption, such as seven or eight o’clock in the evening, and then release the electricity.
- Photovoltaic power generation and load power are not necessarily the same. Photovoltaic power generation is affected by radiation and is not very stable, and the load is not stable, such as air conditioners and refrigerators. The starting power is very large, but the normal operating power is less. If the photovoltaic power supply is directly connected to the Load will cause the system to be unstable and the voltage to rise and fall. The energy storage battery is a power balancing device. When the photovoltaic power is greater than the load power, the controller sends the excess energy to the battery bank for storage. When the photovoltaic power cannot meet the load needs, the controller sends the battery power to the load. .
- The cost of off-grid systems is high. The off-grid system consists of photovoltaic array, solar controller, inverter, battery bank, load, etc. Compared with the grid-connected system, the addition of batteries accounts for 30-40% of the cost of the power generation system, which is almost the same as the components. Moreover, the service life of batteries is not long. Lead-acid batteries generally last for 3-5 years, and lithium batteries generally last for 8-10 years, after which they need to be replaced.
The new energy storage lithium iron phosphate battery, as the energy storage device of the photovoltaic system, can increase the energy storage efficiency to 95%, which can significantly reduce the cost of solar power generation. Lithium batteries have an energy efficiency of 95%, while currently commonly used lead-acid batteries are only about 80%. Lithium batteries are lighter in weight and have a longer service life than lead-acid batteries. The number of charge and discharge cycles can reach 1600, which means they do not need to be replaced frequently.
At present, more and more photovoltaic power generation and energy storage adopt lithium batteries. With technological breakthroughs, the market share of ternary lithium/lithium iron phosphate batteries is gradually increasing in photovoltaic off-grid systems. This is a new application trend.
Summary: In recent years, the proportion of lithium battery energy storage in newly installed capacity of various energy storage systems has gradually increased. Based on the application status of domestic and foreign energy storage power stations and battery characteristics, it is recommended that the main battery selection for energy storage power stations is lithium iron phosphate batteries.
Job Wang（Mr）
Shenzhen Lolsolar New Energy Technology Co.,Ltd
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