Why should solar off-grid system be equipped with energy storage LiFePO4 battery?

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Why should the solar off-grid system be equipped with energy storage lithium iron phosphate battery? The energy storage battery is indispensable in an off-grid system. The solar panel charges the energy storage battery through the controller, and the iron lithium battery provides the inverter output for users through the off-grid inverter. The energy storage battery is commonly used in the off-grid photovoltaic system, such as iron lithium phosphate battery and lead-acid battery.


Solar off-grid system composition

Solar modules, off-grid inverters (including photovoltaic chargers/inverters), energy storage batteries (lead-acid/colloidal/lead-carbon/lithium NCM/lithium LiFePO4), photovoltaic supports, cables, and distribution boxes are all important components of off-grid photovoltaic systems.

The biggest difference between the off-grid system and the on-grid system is that the on-grid system is calculated on the premise of investment income, while the off-grid system is based on the basic demand of power supply. Therefore, they have different priorities when selecting components.


Why should the solar off-grid system be equipped with energy storage lithium iron phosphate battery?

In an off-grid system, the energy storage lithium iron phosphate battery accounts for a large proportion, the cost is similar to that of solar modules, but the life is much shorter than that of modules.

1. The photovoltaic power generation time and load power consumption time may not be synchronized. The input of the photovoltaic off-grid system is the component, which is used for power generation and the output is the load. Photovoltaic power generation is during the day, the sun can generate power, often in the noon power generation is the highest, but at noon, the electricity demand is not high, many households use off-grid power station at night, then how to generate electricity during the day, to store energy, the storage equipment is energy storage iron phosphate lithium battery. Wait for peak hours such as seven or eight o 'clock in the evening, then release the electricity.

2. Photovoltaic power generation and load power are not necessarily the same. Photovoltaic power generation is not very stable due to the influence of radiation degree, and the load is not stable either. 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 for storage. When the photovoltaic power cannot meet the load demand, the controller sends the energy from the battery to the load.

3. High cost of an off-grid system. An off-grid system is composed of a photovoltaic array, solar controller, inverter, battery, load, etc. Compared with grid-connected systems, the extra batteries account for 30-40% of the cost of the system, almost as much as the components. And the service life of the battery is not long, lead-acid battery is generally in 3-5 years, the lithium battery is generally in 8-10 years, after the replacement.

The new energy storage lithium iron phosphate battery, as an energy storage device of a photovoltaic system, can improve the energy storage efficiency to 95%, can significantly reduce the cost of solar power generation. Lithium-ion batteries are 95% energy efficient, compared with about 80% for lead-acid batteries. Lithium batteries are lighter and have a longer life than lead-acid batteries. They can be charged and discharged 3,000 to 5,000 times, which means they don't need to be replaced often.

At present, more and more photovoltaic power generation energy storage adopts lithium battery with the breakthrough of the technology update, and the market share of NCM/LiFePO4 battery gradually increases in an off-grid system, which is a new application trend.

In recent years, the proportion of lithium battery energy storage in the newly installed capacity of various energy storage systems has been gradually increased. According to the application status and battery characteristics of energy storage power stations at home and abroad, it is suggested that the battery selection of energy storage power stations is mainly lithium iron phosphate batteries.


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