1. What is the LiFePO4 Battery Run Time Calculator?

The LiFePO4 Battery Run Time Calculator estimates how long a Lithium Iron Phosphate (LiFePO4) battery will power an uninterruptible power supply (UPS) system based on battery capacity, voltage, and load power.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{LiFePO4 Ah} \) — Battery capacity in amp-hours
• \( V \) — Battery nominal voltage (typically 12V, 24V, or 48V)
• \( \text{UPS W} \) — Power consumption of connected load in watts

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

3. Importance of Run Time Calculation

Details: Accurate runtime estimation helps in sizing battery banks for UPS systems, ensuring critical equipment remains powered during outages for the required duration.

4. Using the Calculator

Tips: Enter battery capacity in Ah, battery voltage in volts (typically 12V for single battery), and UPS load power in watts. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Is this calculation accurate for real-world scenarios?
A: This provides theoretical runtime. Actual runtime may be 10-20% less due to inefficiencies, battery age, temperature, and discharge rate.

Q2: What's the difference between LiFePO4 and lead-acid runtime?
A: LiFePO4 batteries typically provide more usable capacity (80-90% vs 50% for lead-acid) and maintain voltage better under load.

Q3: Should I consider battery depth of discharge (DoD)?
A: Yes. While LiFePO4 can handle 80-100% DoD, limiting to 80% will extend battery life. Multiply result by 0.8 for conservative estimate.

Q4: How does battery configuration affect runtime?
A: Series connections increase voltage, parallel connections increase Ah capacity. Use total system voltage and capacity in calculations.

Q5: What about inverter efficiency?
A: For more accuracy, divide result by inverter efficiency (typically 0.85-0.95 for good UPS systems).