Battery Pack Capacity Calculator

Series-Parallel Battery Pack Formula:

\[ Total\ Capacity = Individual\ Capacity \times Number\ in\ Parallel \times \left(\frac{Series\ Voltage}{Nominal\ V}\right) \]

Individual Capacity:

Number in Parallel:

Series Voltage:

Nominal Voltage:

Total Capacity:

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1. What is Battery Pack Capacity?

Battery pack capacity refers to the total energy storage capability of a battery configuration consisting of multiple cells connected in series and/or parallel. It determines how long the battery pack can power a device or system.

2. How Does the Calculator Work?

The calculator uses the series-parallel battery pack formula:

\[ Total\ Capacity = Individual\ Capacity \times Number\ in\ Parallel \times \left(\frac{Series\ Voltage}{Nominal\ V}\right) \]

Where:

\( Individual\ Capacity \) — Capacity of a single battery cell (Ah or Wh)
\( Number\ in\ Parallel \) — Number of parallel-connected cells
\( Series\ Voltage \) — Total voltage of series-connected cells
\( Nominal\ V \) — Nominal voltage of a single cell

Explanation: This formula calculates the total capacity of a battery pack by considering both parallel connections (which increase capacity) and series connections (which increase voltage).

3. Importance of Battery Pack Calculation

Details: Accurate battery pack capacity calculation is essential for designing power systems, estimating runtime, ensuring proper device operation, and selecting appropriate battery configurations for specific applications.

4. Using the Calculator

Tips: Enter individual cell capacity (in Ah or Wh), number of parallel cells, total series voltage, and nominal cell voltage. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between Ah and Wh?
A: Ah (Ampere-hour) measures charge capacity, while Wh (Watt-hour) measures energy capacity. Wh = Ah × Voltage.

Q2: How does series connection affect capacity?
A: Series connection increases voltage but maintains the same capacity (Ah) as a single cell.

Q3: How does parallel connection affect capacity?
A: Parallel connection increases capacity (Ah) while maintaining the same voltage as a single cell.

Q4: When should I use Ah vs Wh?
A: Use Ah when working with constant voltage systems, and Wh when comparing batteries with different voltages or calculating energy consumption.

Q5: What are typical nominal voltages?
A: Common nominal voltages: Li-ion (3.6-3.7V), Lead-acid (2V/cell, 6V, 12V), NiMH (1.2V), Alkaline (1.5V).