Sizing a LiFePO4 (Lithium Iron Phosphate) lithium battery bank for a system takes numerous procedures to guarantee it satisfies your energy storage needs. Here’s a guide to help you size your LiFePO4 battery bank correctly:
Determine Your Energy Needs
Calculate your daily energy use in watt-hours (Wh) or kilowatt-hours (kWh). This is the total energy your system will need to provide in a day. Consider peak loads and any appliances that will be operating concurrently.
Choose Depth of Discharge (DoD)
LiFePO4 batteries may normally have a DoD of up to 80% or even higher, however a frequent figure utilized is 80%.
Total Battery Capacity Required
Total Battery Capacity = Daily Energy Consumption / DoD. For example, if your daily energy use is 10 kWh and you set a DoD of 80%: Total Battery Capacity = 10 kWh / 0.80 = 12.5 kWh
Select Battery Voltage
Choose a battery bank voltage depending on your system needs (e.g., 12V, 24V, 48V). This option will rely on the inverter and other system components.
Calculate Number of Battery Modules
Determine the capacity of individual LiFePO4 battery modules. Divide the total battery capacity required by the capacity of a single module to find out how many modules are needed. Number of Battery Modules = Total Battery Capacity / Capacity per Module
Consider Battery Management System (BMS)
Ensure the battery bank has a BMS to handle charging, discharging, and balancing of individual cells. This is critical for safety and good performance.
Account for Efficiency Losses
Factor in efficiency losses while charging, discharging, and inverter conversion. Multiply the entire battery capacity by the efficiency factor to ensure you have adequate capacity.
Consider Future Expansion
If you anticipate growing your system in the future, consider allocating space for extra battery capacity. This may save expenditures on future expansions.
Select Batteries with Suitable Temperature Ratings
Choose LiFePO4 batteries with temperature ratings suited for your environment, particularly if exposed to harsh temperatures.
Let’s simply imagine that our system has to operate 10 amps at 120 volts for 4 hours. For our example, we will utilize a 12 volt 100Ah battery bank.
Depth of Discharge (DoD) = 100%
1. Total Energy Requirement:
Total Energy = Power × Time.
Total Energy = 1200 Watts × 4 hours = 4800 Watt-hours or 4.8 kWh.
2. Total Battery Capacity Required:
Total Battery Capacity equals Total Energy.
Total Battery Capacity = 4.8 kWh.
3. Calculate Number of 12V 100Ah Batteries:
Each 12V 100Ah battery has a capacity of 1.2 kWh (12V × 100Ah = 1200Wh = 1.2kWh).
Number of Batteries = Total Battery Capacity / Capacity per Battery.
Number of Batteries = 4.8 kWh / 1.2 kWh = 4 batteries.
You would need at least 4 Yibai Energy batteries.
Depth of Discharge (DoD) = 80%
1. Total Battery Capacity Required:
Total Battery Capacity = Total Energy / DoD.
Total Battery Capacity = 4.8 kWh / 0.80 = 6 kWh.
2. Calculate Number of 12V 100Ah Batteries:
Number of Batteries = Total Battery Capacity / Capacity per Battery.
Number of Batteries = 6 kWh / 1.2 kWh = 5 batteries.
You would need at least 5 Yibai Energy batteries.
Summary
For a DoD of 100%, you would need at least 4 12V 100Ah Yibai Energy batteries. For a DoD of 80%, you would need at least 5 12V 100Ah Yibai Energy batteries. By carefully examining these criteria and combining them with your individual application demands, you can pick a LiFePO4 battery bank that satisfies your system requirements and delivers dependable energy storage.
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