UPS Battery Backup Calculator

How to Calculate UPS Battery Backup Time

To calculate the backup time of a UPS battery, use the following formula:

Where:

• Battery Capacity (Ah): The ampere-hour rating of the battery.
• Battery Voltage (V): The voltage of the battery (e.g., 12V, 24V).
• Efficiency: The efficiency of the UPS system (typically 0.8 to 0.9).
• Load Power (W): The power consumption of the connected devices.

Example Calculation

If you have a 12V battery with a capacity of 100Ah, an efficiency of 0.85, and your load is 300W, the backup time is calculated as follows:

Conclusion

Using this method, you can estimate the battery backup time for your UPS system to ensure uninterrupted power during outages.