Battery Capacity Calculator
Battery Capacity Calculator
Battery Capacity Calculator | Calculate Battery Capacity in Ah, Wh & Runtime
A Battery Capacity Calculator helps determine the required battery size based on your load power (W), operating voltage (V), required backup time (hours), or current (A). It is useful for designing battery systems for solar energy storage, UPS, electric vehicles, portable power stations, telecom, robotics, medical equipment, and industrial applications.
Battery Capacity Formula
Method 1: Calculate Capacity from Power
Battery Capacity (Ah) = (Load Power (W) × Backup Time (Hours)) ÷ Battery Voltage (V)
Example
- Load Power = 500W
- Battery Voltage = 48V
- Backup Time = 4 Hours
Capacity = (500 × 4) ÷ 48 = 41.7Ah
A battery of approximately 48V 50Ah would typically provide additional operating margin, though the final size depends on system efficiency and allowable depth of discharge.
Method 2: Calculate Energy (Wh)
Energy (Wh) = Battery Voltage (V) × Battery Capacity (Ah)
Example
- Voltage = 48V
- Capacity = 100Ah
Energy = 48 × 100 = 4,800Wh (4.8kWh)
Method 3: Calculate Runtime
Runtime (Hours) = Battery Energy (Wh) ÷ Load Power (W)
Example
- Battery = 48V 100Ah
- Energy = 4,800Wh
- Load = 600W
Runtime = 4,800 ÷ 600 = 8 Hours
Actual runtime will usually be lower due to inverter losses, battery management limits, cable losses, temperature, and usable battery capacity.
Battery Capacity Calculator Table
| Load Power (W) | Voltage | Backup Time | Required Capacity |
|---|---|---|---|
| 100W | 12V | 5 Hours | 41.7Ah |
| 200W | 12V | 4 Hours | 66.7Ah |
| 500W | 24V | 4 Hours | 83.3Ah |
| 500W | 48V | 4 Hours | 41.7Ah |
| 1000W | 48V | 5 Hours | 104.2Ah |
| 2000W | 48V | 3 Hours | 125Ah |
| 3000W | 51.2V | 4 Hours | 234.4Ah |
Battery Energy Conversion
| Battery | Energy |
|---|---|
| 12V 100Ah | 1.2kWh |
| 24V 100Ah | 2.4kWh |
| 48V 100Ah | 4.8kWh |
| 51.2V 100Ah | 5.12kWh |
| 48V 200Ah | 9.6kWh |
| 51.2V 200Ah | 10.24kWh |
Factors That Affect Battery Capacity
- Load Power
- Battery Voltage
- Backup Time Required
- Battery Chemistry
- Depth of Discharge (DoD)
- Temperature
- Inverter Efficiency
- Battery Age
- Charge & Discharge Rate
- Battery Management System (BMS)
Common Applications
Use this calculator for:
- Solar Energy Storage Systems
- Home Battery Backup
- UPS Systems
- Telecom Backup
- Electric Vehicles
- Portable Power Stations
- Marine Batteries
- Medical Equipment
- Robotics
- Industrial Equipment
- Off-Grid Power Systems
Why Choose LiFePO₄ Batteries?
- Long Cycle Life
- High Efficiency
- Low Maintenance
- Good Thermal Stability
- Lightweight Design
- Fast Charging Capability
- High Usable Capacity
- Suitable for Daily Cycling
Why Choose Lion Battery?
- Custom Battery Pack Design
- LiFePO₄ & Lithium-ion Battery Manufacturing
- OEM & ODM Manufacturing
- Smart BMS Integration
- Battery Pack Assembly
- Prototype Development
- Battery Testing & Validation
- Technical Engineering Support
- Bulk Production
- Reliable After-Sales Service
Frequently Asked Questions (FAQ)
How do I calculate battery capacity?
Use the formula:
Battery Capacity (Ah) = (Load Power × Backup Time) ÷ Battery Voltage
What is the difference between Ah and Wh?
- Ah (Ampere-hours) measures electrical charge.
- Wh (Watt-hours) measures stored energy.
Two batteries can have the same Ah rating but different energy if their voltages differ.
How do I convert Ah to Wh?
Wh = Voltage × Ah
Example:
48V × 100Ah = 4,800Wh (4.8kWh)
Why is actual runtime different from calculated runtime?
Actual runtime can vary because of inverter efficiency, depth of discharge limits, temperature, battery ageing, wiring losses, and system operating conditions.
Which battery chemistry is best for energy storage?
LiFePO₄ (LFP) batteries are widely used for energy storage because they offer long cycle life, high efficiency, and good thermal stability.
Contact Us
Lion Battery
📞 Phone / WhatsApp: +91-9724991737
📧 Email: info@lionbattery.in
🌐 Website: https://lionbattery.in