1. What is UPS Battery Run Time?

The UPS battery run time is the estimated duration a UPS (Uninterruptible Power Supply) can power connected equipment during a power outage, based on battery capacity, voltage, and the power consumption of the connected load.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• Battery Capacity — Total amp-hour rating of the UPS batteries
• Voltage — Nominal voltage of the battery bank
• Load Power — Total power consumption of connected equipment

Explanation: The equation calculates how long the stored energy in the batteries can sustain the connected load.

3. Importance of Run Time Calculation

Details: Accurate run time estimation is crucial for ensuring critical equipment remains powered during outages and for proper UPS sizing.

4. Using the Calculator

Tips: Enter battery capacity in amp-hours (Ah), voltage in volts (V), and load power in watts (W). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Is this calculation accurate for all UPS systems?
A: This provides an estimate. Actual run time may vary based on battery age, temperature, discharge rate, and UPS efficiency.

Q2: Should I derate the battery capacity?
A: For lead-acid batteries, consider using 80% of rated capacity to account for aging and efficiency losses.

Q3: How do I account for multiple batteries?
A: For parallel batteries, sum the Ah ratings. For series, sum voltages while Ah stays the same.

Q4: What's typical run time for a home UPS?
A: Typically 5-30 minutes for computers, longer for smaller loads like routers (several hours).

Q5: How can I extend my UPS run time?
A: Reduce connected load, add more batteries (if UPS supports expansion), or use higher capacity batteries.