How long do solar batteries last?
More and more people want to install solar energy storage systems to help them reduce their electricity bills and also contribute to environmental protection. Although the price of solar energy storage systems is constantly decreasing, it is still a big investment, so people are very concerned about how long the service life of energy storage batteries. This article will give you a detailed answer to the full life cycle of solar energy storage system and various factors affecting the use cycle.
1. How long is the design life of the whole solar energy storage system?
The solar energy storage system is mainly composed of photovoltaic panels, inverter and energy storage batteries. Among them, the design life of photovoltaic panels is 25 years, the design life of inverters is generally 5-10 years, and the service life of energy storage batteries is generally 10 years. Of course, all of them are not absolutely and design life is not equal to service life.
This means that during the 25-year service life of the photovoltaic power generation system, you will need to replace the energy storage battery and inverter 1-2 times. Since the cost of the battery accounts for about 60% of the entire energy storage system, and the efficiency of the battery will decrease with the increase of use time, just like your mobile phone battery, after one to two years, the power consumption rate will be faster than before. Therefore, the service life and efficiency of energy storage batteries are the most concerned by users.
2. What factors affect the battery life and charge and discharge efficiency?
There are many factors that affect the service life and charge and discharge efficiency of energy storage batteries.
- Raw materials of the battery
- production process
- installation environment
- depth of charge and discharge
- numbers of charge and discharge
- cell grade.
The advantages of lithium-ion batteries are high energy density, more cycles times, environmental protection, the disadvantage is high price, and higher safety requirements for production.
Advantages of lead-acid batteries: low price. Disadvantages are low energy density, fewer cycle times, and unfriendly environment. Sodium-ion batteries do not have active cathode materials, and do not contain precious metals, low price, environmentally friendly, high safety. However, it is still in the research and development and laboratory stage, and has not been applied on a large scale. Therefore, the current raw materials for energy storage batteries are mainly lithium iron phosphate.
2.2: installation environment
The application of energy storage batteries has corresponding environmental temperature requirements. Too high or too low will affect the battery life. At present, the best use of lithium iron phosphate batteries is zero to 45 degrees. If the ambient temperature of your use exceeds this range, you will need to consider the corresponding temperature control equipment or installation environment for the energy storage battery. Such as storage, industrial air conditioning and so on. HT Infinitepower's commercial energy storage batteries integrate outdoor cabinets and industrial air conditioning so you don't have to worry about ambient temperatures.
2.3:Depth of discharge (DOD): As an important parameter of energy storage batteries, DOD has a great impact on the service life of energy storage batteries.
DOD: A measure of the degree of discharge as a percentage of discharge capacity to total discharge capacity.
The DOD of the battery is generally set to 80%, which can protect the battery life to the greatest extent. If the DOD setting is too high, causing the battery to work at full load each time, the service life of the battery will be shortened.
2.4:Cycle times of charge and discharge
The battery is fully charged and then discharged, which is called a cycle. Lithium iron phosphate 80% of DOD cases, the number of cycles is generally 4000 times. If the battery is cycled once a day, then 4000 divided by 365 equals 11 years in theory。
2.5 Cell grade:
The energy storage battery is composed of several cells(usually 15 or 16 cells for a battery module), and the quality of the energy storage battery determined by the cells. Cell production has strict requirements for the voltage, internal resistance, and capacity difference of each cell, and the cell that exceeds the standard range is Class B. The work of the energy storage battery follows the wooden barrel effect, and the entire battery pack will work according to the state of the worst quality cell, and after 3-6 months of the energy storage battery made by the B-cell, the user finds that the work efficiency of the energy storage battery is very low. Even if one cell does not work, the entire energy storage battery will stop working. This will cause big trouble to the customer. Of course, the price of energy storage batteries adopting B cells will be much cheaper.
To sum up:
The lifespan of the energy storage battery is mainly determined by the installation environment and the quality of the battery cell. The energy storage battery is wrapped in a metal shell, and you cannot check cells inside, unless you are very professional , you can not distinguish the grade of the cells. Therefore, it is very important to choose a reliable supplier.
As A professional manufacturer of energy storage batteries, HT Infinitepower always puts the interests of customers first, using Class A cells, strict production quality control and 24-hour after-sales service. If you are interested in our energy storage batteries, please feel free to contact us.
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