Enter the total power delivered by the sun to the area of the solar panel and the total power generated by the solar panel to determine the solar panel efficiency.

Solar Panel Efficiency Formula

The following formula is used to calculate the efficiency of a solar panel:

E = Pout/Pin * 100

Where E is the solar panel efficiency
Pout is the output power of the solar panel
Pin is the total power delivered by the sun to the area of the solar panel or cell

Solar Panel Efficiency Definition

What is a solar panel efficiency?

Solar panel efficiency is the percentage of the total power delivered by the sun to the area of a solar panel that it can then convert into electrical power.

What is the average solar panel efficiency?

The average solar panel efficiency is between 12-16%.

Example Problem

How to calculate solar panel efficiency?

First, determine the total power delivered to the area of the solar panel.
For this example, we will use a simple value of 400 watts.
Next, determine the total power output by the solar panel.
In this case, the solar panel is able to generate 30 watts of power from the 400 watts of power delivered by the sun.
Finally, calculate the efficiency of the solar panel.
Using the formula above, the solar panel efficiency is calculated to be:
E = Pout/Pin * 100
E = 30/400 * 100
E = 7.5%