Amps per Hour Calculator

Introduction

Understanding how long a battery will power a device requires converting its capacity in amp-hours (Ah) into run time at a given current draw in amps (A). This calculation is essential in applications from solar installations to automotive electronics and marine systems. With our Amps per Hour Calculator, simply enter your battery capacity and device draw to instantly estimate run time.

Usage Guide

1. Input the battery capacity in amp-hours (Ah).
2. Enter the current draw of your device in amps (A).
3. Click Calculate Runtime to see how many hours the battery lasts.

Calculation Formula

The runtime (hours) is calculated by dividing capacity by current:

Runtime (h) = Capacity (Ah) ÷ Current (A)

For example, a 100 Ah battery powering a 10 A load runs for 10 hours.

FAQs

1. What affects actual battery run time?

Real-world factors include battery age, temperature, and Peukert’s effect which reduces capacity at high discharge rates.

2. Can I calculate reverse (amps from Ah)?

Yes—enter desired runtime and capacity to solve for current: Current = Capacity ÷ Time.

3. Is this tool mobile-friendly?

Absolutely—fully responsive design ensures ease on any device.

4. How accurate is this estimate?

This provides ideal run time; adjust for efficiency and environmental factors for precise planning.

5. Explore more tools

Find additional converters and calculators at Explore more tools.

6. Disclaimer

This calculator offers estimates only; consult battery datasheets and professionals for critical applications.