1. What is the Lithium Battery Run Time Calculator?

The Lithium Battery Run Time Calculator estimates how long a UPS (Uninterruptible Power Supply) can run on its lithium battery backup based on the battery capacity, voltage, and UPS power consumption.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Lithium Ah} \) — Battery capacity in amp-hours
• \( V \) — Battery voltage in volts
• \( \text{UPS W} \) — UPS power consumption in watts

Explanation: The formula calculates the theoretical maximum run time by dividing the total battery energy (Ah × V) by the power consumption (W).

3. Importance of Run Time Calculation

Details: Accurate run time estimation is crucial for determining how long critical equipment can operate during power outages and for proper UPS sizing.

4. Using the Calculator

Tips: Enter battery capacity in amp-hours, battery voltage in volts, and UPS power consumption in watts. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Is this calculation accurate for all lithium batteries?
A: This provides a theoretical maximum. Actual run time may vary due to battery age, temperature, discharge rate, and UPS efficiency.

Q2: What's the difference between Ah and Wh?
A: Amp-hours (Ah) measure charge capacity, while watt-hours (Wh) measure energy capacity (Ah × V = Wh).

Q3: Should I use nominal or actual voltage?
A: Use nominal voltage for estimation. For lithium batteries, this is typically 3.2V per cell (12.8V for 4S configuration).

Q4: How does load affect run time?
A: Higher loads (more watts) will decrease run time proportionally. Running at 50% load typically more than doubles run time compared to full load.

Q5: What's a typical run time for UPS systems?
A: Most UPS systems provide 5-30 minutes at full load, but extended runtime systems can provide several hours.