Battery Capacity and Sizing Calculators for Solar and UPS Systems

Battery Bank Capacity Calculator

Load (kVA):

Power Factor:

Backup Time (Hours):

Inverter Efficiency (Decimal):

Utilization Factor:
0.52 (30 Min Backup) 0.62 (1 Hour Backup) 0.72 (2 Hour Backup) 0.83 (3 Hour Backup) 0.85 (4 Hour Backup) Custom (Enter Manually)

End Cell Voltage (ECV):
1.80V (DoD: 90%) 1.75V (DoD: 87.5%) 1.70V (DoD: 85%) 1.65V (DoD: 82.5%) 1.60V (DoD: 80%)
Calculate Battery Bank VAH Capacity

Disclaimer: This tool provides an estimate of battery capacity based on the inputs provided. Actual battery capacity may vary due to factors such as temperature, discharge rate, battery quality, manufacturer specifications, inverter efficiency, and aging. Always consult with a professional for accurate sizing.

End Cell Voltage: The minimum voltage at which a battery can be discharged without causing damage. Typically, it is 1.75V per cell for lead-acid batteries.

Depth of Discharge (DoD): The percentage of the battery’s capacity that has been used (e.g., 80% DoD means 20% capacity remains).

Battery AH Capacity Calculator

Total VAH Required:

Battery Bank Voltage (V):

Calculate AH Capacity

Disclaimer: This tool provides an estimate of the AH capacity of each battery based on the inputs provided. Actual requirements may vary due to factors such as battery quality, manufacturer specifications, and system design. Always consult with a professional for accurate sizing.

Battery Capacity Calculator

Load (kVA):

Power Factor:

Backup Time (Hours):

Inverter Efficiency (Decimal):

Utilization Factor:
0.52 (30 Min Backup) 0.62 (1 Hour Backup) 0.72 (2 Hour Backup) 0.83 (3 Hour Backup) 0.85 (4 Hour Backup) Custom (Enter Manually)

End Cell Voltage (ECV):
1.80V (DoD: 90%) 1.75V (DoD: 87.5%) 1.70V (DoD: 85%) 1.65V (DoD: 82.5%) 1.60V (DoD: 80%)
Calculate Battery Bank VAH Capacity

Disclaimer: This tool provides an estimate of battery capacity based on the inputs provided. Actual battery capacity may vary due to factors such as temperature, discharge rate, battery quality, manufacturer specifications, inverter efficiency, and aging. Always consult with a professional for accurate sizing.

End Cell Voltage: The minimum voltage at which a battery can be discharged without causing damage. Typically, it is 1.75V per cell for lead-acid batteries.

Battery Capacity and Sizing Calculators for Solar and UPS Systems

Our Battery Capacity Calculators are essential tools for designing efficient and reliable power backup systems. Whether you’re calculating the required battery bank capacity (VAH), determining the number of batteries needed, or finding the AH capacity of each battery, these calculators simplify complex calculations. Designed for solar energy systems, UPS systems, inverters, and off-grid power solutions, these tools consider critical factors like load (kVA), power factor, backup time, inverter efficiency, utilization factor, and depth of discharge (DoD). With options to input battery voltage (2V or 12V) and battery bank voltage, these calculators provide accurate results instantly. Perfect for engineers, electricians, solar installers, and DIY enthusiasts, our tools help you size batteries for home energy storage, industrial applications, and renewable energy projects. Use our calculators to optimize your battery sizing, reduce costs, and ensure reliable power backup. Start calculating now and take the guesswork out of your energy system design!

About the Battery Capacity Calculator

This Battery Capacity Calculator is designed to help you estimate the required battery bank capacity (in VAH) for your electrical load. It considers key factors such as load (kVA), power factor, backup time, inverter efficiency, utilization factor, and depth of discharge. Below is an explanation of the terms used in the calculator:

Key Terminology

1. Load (kVA): The apparent power of the electrical load in kilovolt-amperes.
2. Power Factor (PF): The ratio of real power (kW) to apparent power (kVA). It indicates the efficiency of power usage.
3. Backup Time (Hours): The duration for which the battery needs to power the load.
4. Inverter Efficiency: The efficiency of the inverter in converting DC power from the battery to AC power for the load. It is expressed as a decimal (e.g., 0.9 for 90% efficiency).
5. Utilization Factor (UF): A factor that accounts for the reduction in battery capacity due to high discharge rates. It varies based on the backup time.
6. End Cell Voltage (ECV): The minimum voltage at which a battery can be discharged without causing damage. It is typically 1.75V per cell for lead-acid batteries.
7. Depth of Discharge (DoD): The percentage of the battery’s capacity that has been used. For example, 80% DoD means 20% of the battery’s capacity remains.

Disclaimer

This tool provides an estimate of the required battery capacity based on the inputs provided. Actual battery capacity may vary due to factors such as:

• Temperature: Battery performance decreases in cold environments.
• Discharge Rate: Faster discharge rates reduce usable capacity.
• Battery Quality: Higher-quality batteries often provide better performance and longevity.
• Inverter Efficiency: Losses during DC-to-AC conversion affect the required capacity.
• Aging Factor: Batteries lose capacity over time due to aging.

Note: This calculator is for informational purposes only and should not replace professional advice. Always consult with a qualified engineer or battery specialist for accurate sizing and system design. The website and its owners are not responsible for any inaccuracies or damages resulting from the use of this tool.