1. What is the kWh of a Battery?

The kilowatt-hour (kWh) of a battery represents its energy storage capacity. It indicates how much energy the battery can deliver over time and is a crucial metric for comparing battery systems.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• \( Ah \) — Amp-hours (battery capacity)
• \( V \) — Voltage (battery nominal voltage)
• 1000 — Conversion factor from watt-hours to kilowatt-hours

Explanation: The equation converts the battery's capacity in amp-hours to energy in kilowatt-hours by accounting for the voltage and converting to standard energy units.

3. Importance of Battery Energy Calculation

Details: Knowing a battery's kWh capacity helps in sizing energy systems, estimating runtime, comparing battery performance, and calculating cost per unit of energy stored.

4. Using the Calculator

Tips: Enter the battery's amp-hour rating and nominal voltage. Both values must be positive numbers. Common battery voltages include 12V, 24V, or 48V for lead-acid, and 3.7V for lithium-ion cells.

5. Frequently Asked Questions (FAQ)

Q1: Why convert Ah to kWh?
A: kWh is a standard energy unit that allows comparison across different battery types and voltages, making system design and energy calculations easier.

Q2: What's the difference between Ah and kWh?
A: Ah measures charge capacity, while kWh measures energy capacity (accounting for voltage). kWh = Ah × V / 1000.

Q3: How does battery type affect this calculation?
A: The basic calculation works for all battery types, but actual usable kWh may vary based on chemistry, discharge rates, and temperature.

Q4: What's a typical kWh for car batteries?
A: A standard 12V 50Ah car battery stores about 0.6 kWh. EV batteries typically range from 40-100 kWh.

Q5: How does this relate to battery runtime?
A: Runtime (hours) = (kWh × 1000) / Load (Watts). A 1 kWh battery can power a 100W load for about 10 hours.