1. What is Battery kWh Calculation?

The battery kWh calculation determines the energy capacity of a battery by multiplying the power (in kilowatts) by the time (in hours) the battery can sustain that power output.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( kWh \) — Kilowatt-hours (battery capacity)
• \( kW \) — Power in kilowatts
• \( hours \) — Duration in hours

Explanation: This calculation shows how much energy a battery can store or deliver over a specific time period.

3. Importance of Battery Capacity Calculation

Details: Knowing a battery's kWh capacity helps in sizing batteries for energy storage systems, electric vehicles, and backup power applications.

4. Using the Calculator

Tips: Enter power in kilowatts and time in hours. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How does this relate to battery amp-hours?
A: To convert kWh to amp-hours, divide by battery voltage: Ah = (kWh × 1000) / V

Q2: What's a typical kWh capacity for home batteries?
A: Residential battery systems typically range from 5 kWh to 20 kWh, depending on needs.

Q3: How long will a battery last?
A: Runtime = Battery kWh / Load kW. A 10 kWh battery running a 2 kW load lasts about 5 hours.

Q4: Does this account for battery efficiency?
A: No, actual usable capacity may be less due to efficiency losses (typically 85-95% for lithium-ion).

Q5: How does temperature affect battery capacity?
A: Cold temperatures can temporarily reduce available capacity by 10-20% or more.