1. What is UPS Battery Runtime?

The UPS battery runtime is the duration a UPS (Uninterruptible Power Supply) can power connected equipment during a power outage. It depends on battery capacity, voltage, efficiency, and the power consumption of the connected load.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• Battery Capacity — Total charge stored in the battery (Amp-hours)
• Battery Voltage — Nominal voltage of the battery (Volts)
• Efficiency — Battery and inverter efficiency (typically 85-95%)
• Load — Total power consumption of connected devices (Watts)

Explanation: The equation calculates how long the battery's stored energy can sustain the given load, accounting for conversion losses.

3. Importance of Battery Runtime Calculation

Details: Knowing your UPS runtime helps ensure critical equipment remains powered during outages and allows proper sizing of UPS systems for your needs.

4. Using the Calculator

Tips: Enter battery capacity in Ah, voltage in V, efficiency (0.85-0.95 typical), and load power in W. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical UPS battery efficiency?
A: Most UPS systems have 85-95% efficiency. Check your UPS specifications for exact values.

Q2: How can I increase my UPS runtime?
A: You can add external battery packs, reduce connected load, or use higher capacity batteries.

Q3: Does battery age affect runtime?
A: Yes, battery capacity decreases with age and number of charge cycles.

Q4: Should I derate the calculated runtime?
A: It's wise to subtract 10-20% as a safety margin for aging and unexpected load increases.

Q5: What's the difference between Ah and Wh?
A: Amp-hours (Ah) measure charge, while Watt-hours (Wh) measure energy. Wh = Ah × V.