1. What is Battery Capacity?

Battery capacity is a measure of the charge stored by the battery, typically measured in ampere-hours (Ah) or watt-hours (Wh). This calculator converts between watt-hours and ampere-hours using the battery voltage.

2. How Does the Calculator Work?

The calculator uses the basic electrical formula:

Where:

• \( Ah \) — Ampere-hours (battery capacity)
• \( Wh \) — Watt-hours (energy capacity)
• \( V \) — Voltage (battery nominal voltage)

Explanation: The formula converts energy capacity (Wh) to charge capacity (Ah) by dividing by the battery voltage.

3. Importance of Battery Capacity Calculation

Details: Knowing both watt-hours and ampere-hours is essential for battery system design, capacity planning, and comparing different battery technologies.

4. Using the Calculator

Tips: Enter watt-hours (Wh) and voltage (V) values. Both must be positive numbers. The calculator will compute the ampere-hour (Ah) capacity.

5. Frequently Asked Questions (FAQ)

Q1: Why convert between Wh and Ah?
A: Wh represents energy capacity while Ah represents charge capacity. Different applications require different measurements.

Q2: What's a typical battery capacity?
A: Small batteries might be 5-10Ah (12V), while car batteries are typically 40-100Ah (12V), and large systems can be hundreds of Ah.

Q3: Does temperature affect capacity?
A: Yes, battery capacity typically decreases in cold temperatures and may increase slightly in warm temperatures.

Q4: What's the difference between nominal and actual capacity?
A: Nominal capacity is the rated value, while actual capacity depends on age, temperature, and discharge rate.

Q5: How does this relate to battery runtime?
A: Runtime depends on both capacity and load current. Ah capacity divided by load current gives estimated runtime in hours.