Battery Capacity Explained: Amp-hours, Watt-hours, DOD, C-Rate, Efficiency, And Temperature

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VIDEO CHAPTERS
00:00 What You'll Learn
00:40 Amp-Hours Explained
02:00 Example
02:40 Watt-Hours Explained
03:55 Example
04:35 Amp-Hours Vs Watt-Hours
05:25 Water Analogy
06:15 Battery Examples
07:25 Watt-Hours Are Better
09:00 C-rate Explained
11:40 Depth Of Discharge (DOD)
14:55 Roundtrip Efficiency
17:00 Low Temperature

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What are Amp-hours and Watt-hours, and how exactly do they measure battery capacity?

In this video, I explain the real difference between amp-hours (Ah) and watt-hours (Wh), and why watt-hours give you a much clearer picture of your battery’s actual energy capacity.

I’ll break down exactly what amp-hours measure, how they relate to current flow, and why they often don’t tell the full story. Then we’ll dive into watt-hours, showing how voltage plays a critical role in determining a battery’s total energy storage.

Beyond that, this video covers the hidden factors that affect usable battery capacity, including C-rate, depth of discharge (DOD), round-trip efficiency, and temperature effects. We’ll explore how Peukert’s Law impacts lead-acid batteries, why lithium batteries behave differently, and how environmental conditions can dramatically reduce performance.

Whether you’re designing an off-grid solar system, planning a battery backup, or just trying to understand your energy storage setup, these concepts are essential.

By the end, you’ll know exactly how to compare batteries, calculate real-world watt-hour capacity, and size your system for maximum performance and longevity.

This isn’t just about numbers on a label — it’s about understanding what those numbers truly mean and how to make smarter choices for your solar or backup power setup.

🔋 *Topics Covered:*
Amp-hours vs Watt-hours • Battery Capacity • Peukert’s Law • Depth of Discharge (DOD) • Battery Efficiency • C-Rate Rating • Lead-Acid vs Lithium Batteries • Temperature Effects on Battery Capacity • Off-Grid Solar System Design

#BatteryCapacity #AmpHoursVsWattHours #SolarBatteries #BatteryEfficiency #OffGridSolar #EnergyStorage #LithiumBattery #LeadAcidBattery #DepthOfDischarge #CRating

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DISCLAIMER:

For general informational purposes only. Nothing in this video is intended to be professional electrical advice. Please consult with a licensed professional in their field of expertise in your jurisdiction.