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Conversion Formula:
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The Watt Hours to Amp Hours conversion is used to determine the battery capacity in ampere-hours (Ah) from its energy capacity in watt-hours (Wh). This is particularly important for comparing batteries with different voltages or designing electrical systems.
The calculator uses the simple formula:
Where:
Explanation: Since watt-hours is a measure of energy (power × time) and amp-hours is charge (current × time), the conversion requires dividing by the voltage to account for the difference between power (watts) and current (amps).
Details: This conversion is essential for battery sizing, electrical system design, and comparing batteries with different voltages. It helps determine how long a battery will last under specific loads.
Tips: Enter the battery's watt-hour rating and its nominal voltage. Both values must be positive numbers. The calculator will output the equivalent amp-hour capacity.
Q1: Why convert between Wh and Ah?
A: Wh represents total energy capacity, while Ah represents charge capacity. Conversion is needed when working with systems that specify requirements in different units.
Q2: What's the difference between Wh and Ah?
A: Wh measures energy (power × time), while Ah measures charge (current × time). Wh accounts for voltage differences between systems.
Q3: Can I use this for AC systems?
A: This calculation is for DC systems. For AC, you'd need to consider power factor and other AC-specific factors.
Q4: How accurate is this conversion?
A: The conversion is mathematically exact, but actual battery performance depends on discharge rates, temperature, and battery age.
Q5: What if my battery voltage varies?
A: Use the nominal voltage for estimation. For precise calculations, you'd need to account for the voltage curve during discharge.