Solar storage batteries serve as the cornerstone of energy storage systems, carrying the crucial mission of providing stable and reliable energy to the storage system. A deep understanding of the core technical parameters of energy storage batteries helps us accurately grasp their performance characteristics, further enhancing the overall efficiency of energy storage systems. Below, we will provide a detailed interpretation of the main technical parameters of energy storage batteries, assisting you in better application and management of energy storage systems.
Capacity of the storage battery(Ah)
Battery capacity refers to the amount of electricity discharged by the battery under certain conditions (discharge rate, temperature, termination voltage, etc.), usually in Ah. Battery capacity is usually a sign of the battery’s charge and discharge capacity. Watt-hour (Wh) = voltage * ampere-hour, which is a unit of power and represents how much electricity there is.
Battery capacity is categorized under different conditions into actual capacity, theoretical capacity, and rated capacity. Theoretical capacity refers to the battery capacity under the most ideal conditions; rated capacity is the capacity indicated on the device that can be sustained over a long period under rated operating conditions; while actual capacity is influenced by factors such as temperature, humidity, and charge-discharge rate, and generally, the actual capacity tends to be slightly smaller than the rated capacity.
Rated Voltage(V)
The rated voltage of an energy storage battery refers to its designed operating voltage, usually expressed in volts (V). The energy storage battery module is made up of single battery cells connected in parallel and in series. Parallel connection increases capacity while the voltage remains unchanged, while series connection doubles the voltage while the capacity remains unchanged. You will see parameters similar to 1P24S in the battery PACK parameters: S represents series cells, and P represents parallel cells. 1P24S means 24 in series and 1 in parallel – A cell with a voltage of 3.2V. After 24 cells are connected in series, the rated voltage is 3.2*24=76.8V.
Charge and Discharge Rate (C)
The battery charge and discharge rate is a measure of charging speed. This indicator affects the continuous current and peak current of the battery during operation, and its unit is C. Charge and discharge rate = charge and discharge current/rated capacity, for example: When a battery with a rated capacity of 200Ah is discharged at 100A, all the battery is discharged in 2 hours. The discharge rate is 100/200=0.5C.
Depth of charge and discharge (DOD)
DOD (Depth of Discharge) is used to measure the percentage between the battery discharge and the rated capacity of the battery. Discharge starts from the upper voltage limit of the battery and ends at the lower voltage limit. All discharged electricity is defined as 100% DOD. Generally, the deeper the discharge depth, the shorter the battery cycle life. If the battery power is less than 10%, it may be over-discharged, which will cause some irreversible chemical reactions that seriously affect the battery life. Therefore, in the actual project operation, it is important to balance the needs of battery operation time and cycle life to achieve the optimization of the economy and reliability of the energy storage system.
State of Charge (SOC)
The State of Charge (SOC) of a battery is the percentage of remaining battery capacity relative to its rated capacity. It reflects the remaining capacity of the battery and indicates its ability to continue working. SOC is 0 when the battery is completely discharged, and 1 when it is fully charged, typically represented as a range from 0 to 100%.
State of Health(SOH)
The state of battery health SOH is the ratio of the performance parameters to the nominal parameters after the battery has been used for a period of time. According to the IEEE (Institute of Electrical and Electronics Engineers) standard, after a battery has been used for a period of time, if the capacity of the battery when fully charged is less than 80% of the rated capacity, the battery should be replaced. By monitoring the SOH value, the time when the battery reaches the end of its life can be predicted, and corresponding maintenance and management can be performed.
Conclusion
When you decide to buy energy storage batteries, you need to know clearly about the main technical parameters such as capacity, voltage, charge rate, DOD, SOC, and SOH. HBOWA New Energy has years of experience in producing lifePO4 batteries and is your reliable energy storage batteries cooperating partner, if you have any questions, feel free to contact us any time! We will be more than happy to support you!
