1. What is the Battery Backup Time Calculation?

The battery backup time calculation estimates how long a battery can power a load before needing recharge. It's essential for designing power systems and selecting appropriate battery sizes for Texas Instruments devices and applications.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• Battery Capacity — Total charge stored in the battery (Amp-hours)
• Battery Voltage — Nominal voltage of the battery
• Depth of Discharge — Fraction of battery capacity that can be safely used (typically 0.5-0.8)
• Efficiency — System efficiency accounting for losses (typically 0.8-0.95)
• Load Power — Power consumption of the connected device (Watts)

3. Importance of Battery Calculations

Details: Accurate battery calculations ensure reliable operation of electronic devices, prevent premature battery failure, and help optimize system design for cost and performance.

4. Using the Calculator

Tips: Enter all values in the specified units. Typical values for Depth of Discharge are 0.5-0.8 (50%-80%) and Efficiency is typically 0.8-0.95 (80%-95%).

5. Frequently Asked Questions (FAQ)

Q1: What's a typical Depth of Discharge for lead-acid batteries?
A: For long life, lead-acid batteries typically use 50% DoD (0.5), while lithium-ion can often use 80% (0.8).

Q2: How does temperature affect battery performance?
A: Cold temperatures reduce battery capacity and efficiency. The calculator assumes room temperature operation.

Q3: What efficiency should I use for my system?
A: For systems with DC-DC converters, use 0.85-0.95. For systems with inverters, use 0.8-0.9.

Q4: Can I use this for series/parallel battery banks?
A: Yes, but calculate total capacity and voltage appropriately for your configuration.

Q5: How accurate is this calculation?
A: It provides a good estimate but actual performance may vary due to battery age, temperature, and load variations.