Degradation Rate Calculator
Analyze performance loss over time for batteries, solar panels, or machinery.
What is a Degradation Rate?
A degradation rate is a metric used to quantify the gradual decline in performance, efficiency, or capacity of a physical asset over time. In engineering and renewable energy, this is most commonly applied to solar photovoltaic (PV) modules and lithium-ion batteries.
Understanding this rate is essential for calculating the Levelized Cost of Energy (LCOE) and determining when an asset will reach its "End of Life" (EOL)—the point where it no longer functions effectively for its intended purpose.
How to Calculate Degradation Rate: The Formula
The calculation is typically performed using a linear decay model, which assumes the asset loses a consistent percentage of its original capacity every year.
Step-by-Step Calculation Example
Imagine you installed a solar panel with an initial output of 400 Watts. After 5 years of operation, you measure the output, and it has dropped to 380 Watts. Here is how you calculate the rate:
- Find the total loss: 400 – 380 = 20 Watts.
- Find the total percentage loss: (20 / 400) * 100 = 5%.
- Calculate the annual rate: 5% / 5 years = 1% per year.
Typical Degradation Standards
Different technologies degrade at different rates. Knowing the industry standard helps determine if your equipment is underperforming:
- Solar Panels: Most modern Tier 1 panels have a degradation rate of 0.3% to 0.5% per year. Older panels may reach 0.8% to 1%.
- EV Batteries: Electric vehicle batteries typically degrade at a rate of 1% to 2% per year, depending on charging habits and climate.
- Industrial Pumps: Mechanical efficiency might degrade by 1-3% annually due to internal wear and scaling.
Why the "End-of-Life" Threshold Matters
In most industries, an asset is not considered "dead" when it hits 0% performance. Instead, it hits a threshold (usually 80% for solar and batteries) where it is no longer economically viable to keep in service. Our calculator helps you project exactly how many years you have left before reaching that critical 80% mark based on your current degradation data.