Solar Battery Bank Calculator

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Determine the ideal battery bank size for your solar energy system with our user-friendly calculator. Input your daily power consumption, desired backup duration, battery type, and system voltage to receive accurate capacity recommendations tailored to your needs. Whether you're considering lead-acid, lithium, or LiFePO₄ batteries, our tool simplifies the process, ensuring optimal performance and efficiency for your renewable energy setup.

Solar battery bank Calculator

Solar Battery Bank Calculator

Optional: For charging time calculation

Calculation Results

Solar Calculator Documentation

Solar Battery Calculator Instruction

1. Input Parameters Specification

Input Field Description Unit Required
Daily Energy Consumption Average daily electricity usage kWh Yes
Backup Hours Required Duration of autonomous operation Hours Yes
Peak Power Demand Maximum instantaneous power load kW Yes
Battery Type Determines Depth of Discharge (DOD) - Yes
System Voltage DC system operating voltage Volts (V) Yes
Inverter Efficiency Power conversion efficiency % Yes
Solar Panel Size Solar array capacity (optional) kW No

2. Calculation Process

Core Formulas

1. Hourly Energy Consumption: Hourly Usage (kWh) = Daily Consumption / 24

2. Total Energy Requirement: Total Energy = Hourly Usage × Backup Hours

3. Battery Capacity: Battery (Ah) = (Total Energy × 1000) / (DOD × Efficiency × Voltage)

4. Inverter Sizing: Inverter (kW) = Peak Power × 1.2

5. Solar Charging Time (optional): Charge Hours = Total Energy / (Solar Size × Efficiency)

3. Practical Example

Sample Inputs

  • Daily Consumption: 25 kWh
  • Backup Hours: 36 hours
  • Peak Power: 7.5 kW
  • Battery: Li-Ion (DOD=0.8)
  • Voltage: 48V
  • Inverter Efficiency: 92%
  • Solar Panel: 5 kW

Calculation Steps

  1. Hourly Usage: 25/24 = 1.042 kWh
  2. Total Energy: 1.042 × 36 = 37.5 kWh
  3. Battery Capacity: (37.5×1000)/(0.8×0.92×48) = 1,118 Ah
  4. Inverter Size: 7.5 × 1.2 = 9 kW
  5. Charging Time: 37.5/(5×0.92) = 8.15 hours

4. Engineering Notes

Critical Considerations

  • Add 15-20% capacity buffer for battery aging
  • Temperature derating factors:
    • +35°C: ×0.9 capacity
    • -10°C: ×0.75 capacity
  • Inverter surge capacity should exceed motor starting loads
  • Solar charging assumes 4-5 peak sun hours daily
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