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Battery Run Time Formula:
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Battery run time refers to the duration a battery can power a device before needing recharging. It's calculated by dividing the battery's energy capacity (in watt-hours) by the power consumption of the device (in watts).
The calculator uses the formula:
Where:
Explanation: This formula provides an estimate of how long a battery will last based on its capacity and the power draw of the connected device.
Details: Calculating battery run time is essential for planning power requirements, selecting appropriate batteries for devices, and ensuring uninterrupted operation of electronic systems.
Tips: Enter the battery's energy capacity in watt-hours and the device's power consumption in watts. Both values must be positive numbers greater than zero.
Q1: What's the difference between Wh and mAh?
A: Watt-hours (Wh) measure energy capacity, while milliamp-hours (mAh) measure charge capacity. Wh provides a more accurate measure of battery life as it accounts for voltage.
Q2: Why is my actual battery life different from the calculation?
A: Actual battery life may vary due to factors like battery age, temperature, discharge rate, and device efficiency not accounted for in this simple calculation.
Q3: How do I find my device's power consumption?
A: Check the device specifications, look for power rating labels, or use a watt meter to measure actual power draw.
Q4: Can I use this for solar power systems?
A: Yes, but you'll need to account for additional factors like solar panel output, inverter efficiency, and weather conditions for complete system planning.
Q5: How accurate is this calculation for lithium-ion batteries?
A: It provides a theoretical maximum. Real-world performance of lithium-ion batteries depends on discharge rate, temperature, and battery health.