1. What is UPS Battery Life?

The UPS battery life calculation estimates how long a UPS (Uninterruptible Power Supply) can power connected equipment during a power outage based on battery capacity and power consumption.

2. How Does the Calculator Work?

The calculator uses the UPS battery life equation:

Where:

• Battery Ah — Battery capacity in amp-hours
• Battery Voltage — Battery nominal voltage (typically 12V for many UPS systems)
• UPS Wattage — Total power consumption of connected equipment in watts

Explanation: The equation calculates the total watt-hours available from the battery and divides by the load wattage to determine runtime.

3. Importance of Battery Life Calculation

Details: Accurate battery life 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 Ah, battery voltage in volts, and total UPS load in watts. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: This provides theoretical maximum runtime. Actual runtime may be 10-30% less due to inefficiencies, battery age, and temperature.

Q2: What's typical battery life for a UPS?
A: For a 1500VA UPS with 7Ah batteries at 50% load, expect 10-30 minutes. Critical systems often need extended battery modules.

Q3: How does battery age affect runtime?
A: After 2-3 years, batteries may hold only 60-80% of original capacity, significantly reducing runtime.

Q4: Should I derate the calculation?
A: For critical applications, multiply result by 0.7 to account for real-world conditions and aging.

Q5: Can I connect multiple batteries?
A: Yes, connecting batteries in parallel increases Ah capacity (add Ah values) while maintaining voltage.