1. What is the APC Battery Backup Calculator?

The APC Battery Backup Calculator estimates how long an APC UPS (Uninterruptible Power Supply) will last during a power outage based on battery capacity, voltage, and connected load.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• \( \text{APC Battery Capacity} \) — Battery capacity in amp-hours (Ah)
• \( \text{Voltage} \) — Battery voltage in volts (V)
• \( \text{Load} \) — Connected load in watts (W)

Explanation: The equation calculates how long the battery can supply power to the connected load by converting battery capacity to watt-hours and dividing by load.

3. Importance of Backup Time Calculation

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

4. Using the Calculator

Tips: Enter battery capacity in Ah, voltage in V, and load in W. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Where can I find my APC battery capacity?
A: Check the battery label or APC product specifications. Common capacities range from 5Ah to 20Ah for typical UPS units.

Q2: What voltage do APC batteries use?
A: Most APC UPS systems use 12V batteries, but check your specific model (some use 24V or other voltages).

Q3: How do I measure my actual load?
A: Many APC UPS units display current load percentage. Alternatively, sum the wattage of all connected devices.

Q4: Why is my actual backup time different?
A: Actual runtime may vary due to battery age, temperature, discharge rate, and power factor of connected equipment.

Q5: Can I extend my backup time?
A: Yes, by reducing load or adding external battery packs (if supported by your UPS model).