1. What is the UPS Runtime Formula?

The UPS Runtime Formula calculates the estimated runtime of an Uninterruptible Power Supply (UPS) system based on battery capacity and connected load. It provides a basic estimation of how long the UPS can power connected devices during a power outage.

2. How Does the Calculator Work?

The calculator uses the UPS runtime formula:

Where:

• \( \text{Capacity} \) — Battery capacity in Ampere-hours (Ah)
• \( \text{Load} \) — Connected load in Amperes (A)

Explanation: The formula divides the total battery capacity by the current draw of the connected load to determine runtime in hours.

3. Importance of UPS Runtime Calculation

Details: Accurate runtime estimation is crucial for ensuring adequate backup power during outages, planning for critical system shutdowns, and proper UPS system sizing for specific applications.

4. Using the Calculator

Tips: Enter battery capacity in Ah and connected load in A. All values must be valid positive numbers. This calculation provides a theoretical maximum and actual runtime may vary based on battery age, temperature, and efficiency factors.

5. Frequently Asked Questions (FAQ)

Q1: Why is actual runtime often less than calculated?
A: Actual runtime can be affected by battery age, temperature, discharge rate, inverter efficiency, and battery condition.

Q2: What is a typical UPS battery capacity?
A: UPS battery capacities typically range from 7Ah to 100+ Ah, depending on the UPS size and configuration.

Q3: How does load affect runtime?
A: Higher loads decrease runtime proportionally. Doubling the load halves the runtime.

Q4: Are there limitations to this formula?
A: This is a simplified calculation that doesn't account for efficiency losses, battery age, temperature effects, or non-linear discharge characteristics.

Q5: Should this be used for critical system planning?
A: For critical applications, always consult manufacturer specifications and perform actual runtime tests under expected load conditions.