1. What is APC UPS Runtime?

The APC UPS runtime calculation estimates how long an uninterruptible power supply (UPS) will last during a power outage based on its battery capacity and the connected load. This helps in planning for critical power backup needs.

2. How Does the Calculator Work?

The calculator uses the runtime formula:

Where:

• Battery Capacity — Total energy storage capacity in watt-hours (Wh)
• Load — Total power consumption of connected devices in watts (W)
• 60 — Conversion factor from hours to minutes

Explanation: The equation calculates how long the stored energy will last at the current power draw rate.

3. Importance of Runtime Calculation

Details: Accurate runtime estimation is crucial for ensuring uninterrupted power during outages, especially for critical systems like servers, medical equipment, and network infrastructure.

4. Using the Calculator

Tips: Enter battery capacity in watt-hours (Wh) and load in watts (W). Both values must be positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Where can I find my UPS battery capacity?
A: Check the UPS specifications or battery label. Capacity is typically listed in watt-hours (Wh) or amp-hours (Ah).

Q2: How do I measure my actual load?
A: Many UPS units display current load. Alternatively, sum the wattage of all connected devices.

Q3: Why is actual runtime sometimes less than calculated?
A: Battery age, temperature, and inefficiencies in power conversion can reduce actual runtime.

Q4: Can I connect more batteries to increase runtime?
A: Yes, many UPS systems support external battery packs to extend runtime.

Q5: How often should I test my UPS runtime?
A: Perform runtime tests every 6-12 months as battery capacity degrades over time.