# Solar Panel Efficiency Calculator and Formula

Use our solar panel efficiency calculator to quickly calculate the efficiency of a solar panel.

Alsolet’s explain: Why you should care about solar panel efficiency — does it really matter? — Is it worth paying extra cash for highly efficient solar panels?

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## Solar panel efficiency

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### How To Use Solar Efficiency Calculator?

https://054d1907d090b0e00639a8b233e37dbf.safeframe.googlesyndication.com/safeframe/1-0-40/html/container.html1 – Enter solar panel maximum power output (Pmax). For example, Enter 100 for a 100-watt solar panel. The value should be entered in watts (watts = kW × 1000).

2 – Enter solar panel dimensions (height and width and select the unit type). The unit types are millimeters (mm), and inches (inch). Usually, you’ll find the values on the backside of your solar panels or on the spec data sheet. Unit type for height and width should be the same.

## How To Calculate Solar Panel Efficiency?

Solar panel efficiency formula: Solar panel efficiency = [ solar panel Max. output P(max) ÷ (solar panel area in m2 × 1000) ] × 100

• P(max) = 100 watt
• Area = 0.54 m2
`Solar panel efficiency = [ 100 ÷ (0.54 × 1000) ] × 100`
`Solar panel efficiency = [ 100 ÷ (540) ] × 100`
`Solar panel efficiency = [ 0.18 ] × 100`
`Solar panel efficiency = 18.5`

## Solar Panel Efficiency: Explanation

Solar panel efficiency is the measurement of a solar panel’s ability to convert the sunlight (irradiance) that falls on its surface area into electricity.

For example, a 20% efficient solar panel with an area of 1 m2 (10.7 square feet) will produce about 200 watts and a 15% efficient solar panel with the same room will produce about 150 watts under standard test conditions — STC.

Due to the advancement in photovoltaic technology in recent years, now most solar panels are about 20 — 22% efficient. As the efficiency of a solar panel increases, so will its cost. You may ask now, is it worth paying extra bucks for a highly efficient solar panel system? let’s find out.

## Solar Panel Efficiency — Does It Really Matter?

You might think, a highly efficient solar panel will produce more power than a low-efficient solar panel. Well, that’s not exactly the case.

The wattage rating of a solar panel is the single big factor that will determine the solar system’s power production, not efficiency.

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