Solar Battery Bank Calculator

Solar Battery Bank Calculator Instructions

Our Solar Battery Bank Calculator is a convenient tool designed to help you estimate the appropriate battery bank size for your solar energy needs. By inputting your daily or monthly power consumption, desired backup days, battery type, and system voltage, you can quickly determine the optimal battery capacity for your setup. Here’s a step-by-step guide on how to use the calculator and understand the results:

1. Power Consumption: Enter your power consumption in watt-hours (Wh). You can specify whether this value is per day or per month. This will help the calculator adjust the energy requirement accordingly.
2. Days of Backup: Input the number of days you need your system to provide backup power. This ensures you have enough stored energy to cover any periods without solar generation.
3. Battery Type: Select the type of battery you are using from the options provided: Lead-Acid, Lithium, or LiFePO4. Each type has different Depth of Discharge (DoD) and efficiency levels:
   • Lead-Acid: DoD = 50%, Efficiency = 85%
   • Lithium: DoD = 80%, Efficiency = 95%
   • LiFePO4: DoD = 90%, Efficiency = 95%
4. Voltage: Enter the system voltage of your setup. This is typically 12V, 24V, or 48V, but it can vary depending on your specific requirements.

Calculation Steps

1. Convert Monthly to Daily Consumption (if necessary):
   • Daily Consumption (Wh) = Monthly Consumption (Wh) / 30
2. Calculate Total Energy Requirement:
   • Total Energy Requirement (Wh) = Daily Consumption (Wh) × Days of Backup
3. Adjust for Battery Type (taking into account DoD and Efficiency):
   • Adjusted Energy Requirement (Wh) = Total Energy Requirement (Wh) / (DoD × Efficiency)
4. Calculate Required Battery Capacity:
   • Battery Capacity (Ah) = Adjusted Energy Requirement (Wh) / Voltage (V)
5. Provide Capacity Options:
   • Minimum Capacity: 50% of required capacity
   • Optimal Capacity: 100% of required capacity
   • Larger Suitable Capacity: 150% of required capacity
6. Calculate Days of Backup for Each Option:
   • Days of Backup = (Battery Capacity (Ah) × Voltage (V) × DoD × Efficiency) / Daily Consumption (Wh)

Example Calculation

Inputs:

• Daily Consumption: 500 Wh
• Days of Backup: 3
• Battery Type: Lithium (DoD = 80%, Efficiency = 95%)
• Voltage: 12V

Steps:

1. Total Energy Requirement:
   • 500 Wh/day × 3 days = 1500 Wh
2. Adjusted Energy Requirement:
   • 1500 Wh / (0.80 × 0.95) ≈ 1974 Wh
3. Required Battery Capacity:
   • 1974 Wh / 12V ≈ 164.5 Ah

Capacity Options:

1. Minimum Capacity: 82.25 Ah
   • Days of Backup = (82.25 Ah × 12V × 0.80 × 0.95) / 500 Wh/day ≈ 1.37 days
2. Optimal Capacity: 164.5 Ah
   • Days of Backup = (164.5 Ah × 12V × 0.80 × 0.95) / 500 Wh/day ≈ 2.74 days
3. Larger Suitable Capacity: 246.75 Ah
   • Days of Backup = (246.75 Ah × 12V × 0.80 × 0.95) / 500 Wh/day ≈ 4.11 days

Note

This calculator provides an estimate based on typical values for DoD and efficiency. Actual battery performance can vary due to environmental factors and specific usage patterns. For precise sizing and more detailed information, we recommend contacting a professional. Please visit MANLY Battery for expert advice and assistance.

By using this calculator, you can ensure that you choose the best battery bank size for your solar energy system, whether you’re looking for the best solar batteries or exploring options from a reputable LiFePO4 battery manufacturer.