1. What is a UPS Runtime Calculator?

Definition: This calculator estimates how long a UPS (Uninterruptible Power Supply) can power your equipment during an outage.

Purpose: It helps determine backup power duration based on battery specifications and power consumption.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Runtime \) — Backup time in hours
• \( BatteryCapacity \) — Battery capacity in Amp-hours (Ah)
• \( Voltage \) — Battery voltage in volts
• \( Efficiency \) — UPS efficiency (typically 0.9 for 90%)
• \( PowerLoad \) — Connected load in watts

Explanation: The formula converts battery capacity to watt-hours, accounts for efficiency, then divides by power consumption to get runtime.

3. Importance of UPS Runtime Calculation

Details: Proper runtime estimation ensures your critical equipment remains powered during outages and helps select appropriate UPS capacity.

4. Using the Calculator

Tips: Enter battery capacity (Ah), voltage (default 12V), efficiency (default 0.9), and power load (watts). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical UPS efficiency?
A: Most UPS systems are 85-95% efficient. The default 0.9 represents 90% efficiency.

Q2: How do I find my battery capacity?
A: Check battery specifications - common values are 7Ah, 9Ah, 12Ah, etc. for small UPS units.

Q3: What if I have multiple batteries?
A: Multiply single battery capacity by number of batteries (for parallel-connected batteries).

Q4: How do I measure my power load?
A: Use a wattmeter or check equipment nameplates and sum their wattage requirements.

Q5: Does this account for battery aging?
A: No, consider reducing capacity by 20-30% for older batteries (3+ years).