1. What is the Battery Run Time Formula?

The battery run time formula calculates how long a battery will last given its capacity (in amp-hours), the power consumption of the device (in watts), and the system voltage (in volts). It's essential for designing power systems and estimating battery life.

2. How Does the Calculator Work?

The calculator uses the run time formula:

Where:

• \( Ah \) — Battery capacity in amp-hours
• \( W \) — Power consumption in watts
• \( V \) — System voltage in volts

Explanation: The formula converts watts to amps (W/V) and then divides the battery capacity by this current draw to get runtime in hours.

3. Importance of Run Time Calculation

Details: Accurate run time estimation is crucial for system design, backup power planning, and ensuring devices operate for required durations without power interruption.

4. Using the Calculator

Tips: Enter battery capacity in Ah, power consumption in watts, and system voltage in volts. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between Ah and Wh?
A: Amp-hours (Ah) measure charge capacity, while watt-hours (Wh) measure energy capacity. Wh = Ah × V.

Q2: Does this account for battery efficiency?
A: No, this is theoretical maximum. Real-world results will be lower due to efficiency losses, temperature, etc.

Q3: How accurate is this calculation?
A: It provides a good estimate for constant loads. For variable loads, more complex calculations are needed.

Q4: Can I use this for lithium batteries?
A: Yes, but note lithium batteries often have different discharge characteristics than lead-acid.

Q5: What if my device has varying power consumption?
A: Use average consumption or calculate run time for different modes separately.