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

*Also*, **I’ll explain:** Why you should care about solar panel efficiency — does it really matter? — is it worth paying extra cash for highly efficient solar panels?

## Solar panel efficiency calculator

**Note: **Use our **solar panel output calculator** to get an estimate of the power production of your solar panel.

### how to use solar efficiency calculator?

**1 – Enter solar panel maximum power output ( P_{max}).** 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.*

Enter ** “Calculate” **button for the

**result.**

### Example

Let’s put the values into the calculator.

Renogy 100 watt solar panel is **18.2%** efficient.

## 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

let’s take the Renogy 100 watt solar panel as an example.

- P
_{(max)}= 100 watt - Area = 0.54 m
^{2}

`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 m

^{2}(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, 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.

### solar panel efficiency vs rated wattage

The only difference between a solar panel’s efficiency and its rated wattage is that a high efficient solar panel will take less space to produce the same amount of power than a low efficient solar panel.

** For example, **a 300 watt solar panel with 15% efficiency will produce the same amount of power that a 20% efficient 300 watt solar panel will produce. But, lowe efficient solar panels will take up a bit more space.

## who should get high efficient solar panels?

The only logical explanation I can think of is — **if you have limited rooftop space.**

Otherwise installing high efficient solar panels will only increase the investment.

## other solar calculators

- Battery Charge And Discharge Rate Calculator
- Lead Acid Battery Life Calculator
- Solar Panel Output Calculator
- Solar DC Watts To AC Watts Calculator
- Solar Panel Amps Calculator (Watts To Amps)
- Solar Panel Size Calculator For Battery

## Resources

- Most Efficient Solar Panels 2022
^{[1]} - IS SOLAR POWER WORTH THE INVESTMENT?
^{[2]} - Does Solar Panel Efficiency Really Matter?
^{[3]}

*I hope this guide was helpful to you. Feel free to contact us* if you have any suggestions or queries