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Battery Run Time Formula:
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The battery run time formula calculates how long a 12V battery will last under a specific load. It's based on the battery's capacity (in amp-hours) and the current draw of the connected device (in amps).
The calculator uses the battery run time formula:
Where:
Explanation: This formula divides the total energy storage capacity of the battery by the rate at which energy is being consumed to determine how long the battery will last.
Details: Calculating battery run time is essential for planning power requirements, ensuring devices have sufficient power for their intended use, and preventing unexpected power loss in critical applications.
Tips: Enter the battery capacity in amp-hours (Ah) and the current draw in amps (A). Both values must be positive numbers. The result shows the estimated run time in hours.
Q1: Is this calculation accurate for all battery types?
A: This formula provides a theoretical maximum. Actual run time may vary based on battery age, temperature, discharge rate, and other factors.
Q2: What is the Peukert effect?
A: The Peukert effect describes how battery capacity decreases at higher discharge rates. This calculator provides an estimate that doesn't account for this effect.
Q3: Can I use this for batteries other than 12V?
A: While the formula works for any voltage, this calculator is specifically designed for 12V systems. For other voltages, the calculation would need to consider watt-hours instead of amp-hours.
Q4: How does battery age affect run time?
A: As batteries age, their capacity decreases. An older battery will have a shorter run time than a new one of the same rated capacity.
Q5: Should I completely discharge my battery?
A: For most battery types (especially lead-acid), it's best to avoid complete discharge as it can significantly reduce battery life.