Whenever you want to find out what the standard solar panel sizes and wattages are, you encounter a *big* problem:

There is **no standardized chart** that will tell you, for example, *“A typical 300-watt solar panel is this long and this wide.”*

If you want to calculate how many solar panels you can put on your roof, you will obviously need to know the size of a solar panel. *Example:* 5kW solar system is comprised of 50 100-watt solar panels. Alright, your roof square footage is 1000 sq ft. Can you put a 5kW solar system on your roof? For that, you will need to know what size is a typical 100-watt solar panel, right?

To bridge that gap of very useful knowledge needed, we have compared and averaged the sizes of 100-watt to 500-watt solar panels available on the market. The goal here is to get to the ** average solar panel size by wattage**. You can find typical dimensions of

**100W, 150W, 170W, 200W, 200W, 220W, 300W, 350W, 400W, and 500W**solar panels summarized in the chart below.

But, just to emphasize the problem, let’s have a look at how the standard solar panel sizes are usually explained. They are not expressed as dimensions for certain wattage panels. Rather, we get the typical sizes of solar panels by the number of cells (which is quite useless). There are 3 standardized sizes of solar panels, namely:

**60-cell solar panels size.**The dimensions of 60-cell solar panels are as follows: 66 inches long, and 39 inches wide. That’s basically a 66×39 solar panel. But what is the wattage? That is unfortunately not listed at all.**72-cell solar panel size.**The dimensions of 72-cell solar panels are as follows: 77 inches long, and 39 inches wide. That’s a 77×39 solar panel; basically, a longer panel, mostly used for commercial solar systems.**96-cell solar panel size.**The dimensions of 96-cell solar panels are as follows: 41.5 inches long, and 63 inches wide. That’s a 63×41.5 solar panel. This form is a bit shorter but wider.

The only useful thing that we get from this is depth or height (panel thickness): Most solar panels are about **1.5 inches thick**.

Alright, let’s have a look at the length and width of typical solar panels, with wattage (very important), and complete with area or square footage (useful when calculating how many solar panels you can fit on a roof):

## Average Solar Panel Size By Wattage (Chart)

Solar Panel Wattage: |
Length (Inches): |
Width (Inches): |
Area (Square Feet): |

100 Watts | 41.8 Inches | 20.9 Inches | 6.07 Square Feet |

150 Watts | 50.2 Inches | 26.8 Inches | 9.34 Square Feet |

170 Watts | 58.7 Inches | 26.8 Inches | 10.92 Square Feet |

200 Watts | 65.0 Inches | 26.4 Inches | 11.92 Square Feet |

220 Watts | 71.5 Inches | 32.1 Inches | 12.64 Square Feet |

300 Watts | 65.8 Inches | 36.1 Inches | 16.50 Square Feet |

330 Watts | 65.0 Inches | 39.3 Inches | 17.74 Square Feet |

350 Watts | 63.8 Inches | 43.9 Inches | 19.45 Square Feet |

400 Watts | 79.1 Inches | 39.2 Inches | 21.53 Square Feet |

500 Watts | 88.8 Inches | 44.6 Inches | 27.50 Square Feet |

As we can see, those 60-cell, 72-cell, and 96-cell solar panel dimensions are a bit theoretical. These are the practical solar panel dimensions by wattage from solar panels that are **actually sold on the market*** (made by SunPower, Panasonic, QCells, REC Solar, Renogy, Bluetti, and so on)*.

*Note:* You can allow for up to a **5% difference** in both length and width due to different solar panel manufacturers producing PV panel sizes that vary a bit from these averages.

In the 4th column there, you can see the calculated solar panel square footage as well.

Here are a few examples of the dimensions of the most popular solar panel wattages:

- A
**typical 100-watt solar panel**is**41.8 inches long**and**20.9 inches wide**. It takes up**6.07 sq ft of area**. If you have a 1000 sq ft roof, and you can use 75% of that roof area for solar panels, you can theoretically put**123**100-watt solar panels on a 1000 sq ft roof. - A
**typical 300-watt solar panel**is**65.8 inches long**and**36.1 inches wide**. It takes up**16.5 sq ft of area**. If you have a 1000 sq ft roof, and you can use 75% of that roof area for solar panels, you can theoretically put**45**300-watt solar panels on a 1000 sq ft roof. - A
**typical 400-watt solar panel**is**79.1 inches long**and**39.1 inches wide**. It takes up**21.53 sq ft of area**. If you have a 1000 sq ft roof, and you can use 75% of that roof area for solar panels, you can theoretically put**34**400-watt solar panels on a 1000 sq ft roof.

Now you at least have a good idea of what the standard dimensions of solar panels are and can start calculating how many you can fit on your roof.

Another interesting this we can calculate from the solar panel areas and wattages is this:

*How many watts per square foot can a solar panel generate?*

Dividing the specified wattage by the square footage of the solar panel will give us just this result:

The average solar panel output per area is **17.25 watts per square foot**.

Let’s say that you have 500 square feet of roof available for solar panel installation. What is theoretically the biggest solar system you can put on that roof? Here’s how we can calculate that now (using the result from the solar panel sizes and wattage):

**Max. Size Solar System** = 500 Sq Ft Roof × 17.25 Watts / Sq Ft = **8.625 kW**

This just tells you that, if you have 500 sq ft of roof available for solar panels, you:

*Can*easily install a 5kW solar system*Cannot*install a 10kW solar system.

Hopefully, this average solar panel size chart by solar panel wattage makes things a little clearer now. If you have any questions or suggestions on what to include in this article, you can use the comment section below, and let us know.

Thank you.