What Are the Common Solar Panel Sizes?

The size of solar panels with the same cell count varies slightly, depending on the brand and model. Still, most 60-cell solar panels have a size of 39” X 66” and most 72-cell solar panels have sizes of around 39” X 77”. However, panels with cell counts of 96, 120, and 144 may have different sizes.

This guide explores the standard sizes of solar panels, factors influencing their dimensions, and how to choose the right size for a home solar installation.

Why Solar Panel Size Matters

The size of solar panels directly impacts their power output, installation requirements, and overall system efficiency. Larger panels generally produce more electricity but may require more roof space. 

Smaller panels offer flexibility for installations with limited space, but you may need more panels to achieve the power output you need. 

Additionally, solar panel size can influence the aesthetics of your home. Larger panels are more visually noticeable, which is a consideration for homeowners concerned about maintaining the visual appearance of their property. 

Getting the right panel size also affects the overall cost and ROI of switching to solar energy, making it an important factor in the planning stages of your solar project.

Standard Solar Panel Dimensions

Solar panels are available in several standard sizes, with the most common being 60-cell and 72-cell configurations. These dimensions are based on the number and arrangement of photovoltaic (PV) cells within the panel. 

60-Cell Solar Panels

60-cell solar panels are popular for residential installations due to their manageable size and weight. These panels typically measure:

• Length: Approximately 66 inches (5.5 feet)
• Width: About 39 inches (3.25 feet)
• Thickness: 1.5 to 2 inches
• Weight: 40 to 50 pounds

With a power output ranging from 270 to 300 watts, 60-cell panels are versatile and suitable for most home rooftops. They strike a balance between size and efficiency, which is ideal for average households seeking to reduce their reliance on grid electricity and reduce energy bills.

72-Cell Solar Panels

72-cell solar panels are larger and more common in commercial installations, though they can be suitable for residential use with enough roof space. Their typical dimensions are:

• Length: Around 77 inches (6.42 feet)
• Width: About 39 inches (3. 25 feet)
• Thickness: 1.5 to 2 inches
• Weight: 50 to 60 pounds

These panels generally offer a power output between 320 and 400 watts, making them more efficient in terms of space utilization. 

For homes with larger energy demands or commercial properties, 72-cell panels maximize energy production per square foot of available roof space.

Other Panel Sizes

While 60-cell and 72-cell panels dominate the market, other sizes are available. For example, 96-cell panels measure approximately 41 inches x 62 inches and can produce around 500 watts of power. Larger 120-cell and 144-cell panels are essentially half-cut versions of the 60-cell and 72-cell panels, offering similar dimensions but slightly higher efficiency.

Each of these options has its own specific applications and benefits. For example, 96-cell panels are best for projects where high power output is crucial but space is limited. Meanwhile, half-cut cell panels are designed to reduce resistive losses, providing superior performance even in shaded conditions.

Factors Influencing Solar Panel Size

Several factors contribute to the size and efficiency of solar panels, each playing a role in how well a panel will perform once you install it:

Cell Technology

Advancements in photovoltaic cell design can increase efficiency without changing panel dimensions. This means newer panels can provide more electricity than older iterations with the same physical size.

Frame Design

The frame’s thickness affects the overall panel size and weight. A sturdy frame supports durability and can impact installation ease or cost.

Manufacturing Variations

Slight differences in size can occur between manufacturers, even for panels with the same cell count. These variations can affect compatibility and replacement considerations for mixed-panel systems.

Efficiency Goals

Higher-efficiency panels may be smaller while producing the same power output as larger, less efficient panels. This is a critical factor when roof space is limited but energy needs are significant.

Calculating Solar System Size for Your Home

The average US home consumes 893 kWh monthly. Considering the average 5 Peak Sun Hours (PSH) in the US and a derating factor of 70% attached to PV losses, you can calculate the ideal size of a PV system for the demand of the average home by using this formula:

The result of the calculation is a PV system with a generation capacity of 8.5 kWp. Calculating the size for this PV system in the different solar panels available, allows us to estimate how many PV modules the average solar array should have.

Performing an 8.5 kWp solar panel installation requires a rooftop space going from a little more than 300 sq. ft. to a little less than 600 sq. ft., but this is only an estimate. Since manufacturers may have different dimensions for their solar panels due to manufacturing variations, the overall size could vary depending on the type of PV module that you choose and the manufacturer.

Space Requirements for Solar Arrays

The space required for a solar array depends on the panel size and system capacity. Using the example above:

• A system using 29 60-cell (300W) panels might require about 518 sq. ft. of roof space.
• The same system using 22 72-cell (400W) panels could require approximately 459 sq. ft.

It’s important to note that these are estimates, and actual space requirements may vary based on roof layout, panel orientation, and installation constraints. Your installer might utilize advanced tools or software to provide a more accurate space requirement, taking into account unique roof angles and sunlight exposure specific to your location.

Portable and Specialized Solar Panel Sizes

Beyond standard residential and commercial panels, there are smaller options for specific applications. These specialized panels serve different markets and fulfill unique energy needs.

RV Solar Panels

Often ranging from 50W to 200W, with dimensions like 42″ x 20″ for a 100W panel, these panels enable off-the-grid camping adventures by powering essential appliances and electronics without reliance on campsite hookups or generator noise.

Portable Solar Chargers

Portable chargers can be as small as 12″ x 6″ for low-wattage devices, serving as convenient power sources for hiking, travel, or emergency preparedness.

Solar-Powered Security Cameras

These cameras use compact 30-40W panels measuring about 1.65 sq. ft., offering a sustainable option for maintaining security without an increase in energy expenses.

These specialized panels offer flexibility for mobile applications or small-scale power needs. Whether you’re seeking to charge devices on a hike or power an external security system, these portable options accommodate diverse requirements.

Roof Capacity and Solar Panel Installation

While the average U. S. home has about 1,500 sq. ft. of roof space, not all of this area is suitable for solar panel installation. Factors limiting usable roof space include:

Roof Orientation and Slope

Solar panels are most efficient when you install them on a south-facing roof with an optimal slope angle, which may not always match a home’s architectural design.

Shading from Trees or Nearby Structures

Any obstructions that block sunlight can significantly affect panel performance. You should assess shade patterns throughout the day and across seasons.

Obstructions like Chimneys, Vents, and Skylights

Areas that have chimneys, vents, and skylights are unusable for panel installations and need careful planning to get maximum panel coverage.

Fire Safety Setbacks

Many local codes require fire safety setbacks. These codes impact the amount of roof space that you can dedicate to panels.

A professional solar installer can assess your home’s roof to determine the maximum number of panels that they can safely and effectively install. Their expertise gets your home in compliance with local regulations, safety standards, and optimized performance given existing conditions.

Choosing the Right Solar Panel Size

When selecting solar panels, consider these factors to optimize the number of panels you add to your home. 

• Available Roof Space: Larger panels may be more efficient if you have limited space, helping maximize energy production without spreading across vast roof areas.
• Energy Needs: Higher wattage panels can meet greater energy demands with fewer units. Determining your home’s power usage offers insights into the best options for balancing size and output.
• Budget: While larger panels may cost more upfront, they could provide better long-term value by delivering more energy and reducing future additions.
• Aesthetics: Some homeowners prefer the look of a particular panel size or arrangement.
• Local Regulations: Some areas have restrictions on panel size or system capacity, which could affect your choice.

Working together with the solar provider can help address these factors and come up with a custom solution.

Final Thoughts About Common Solar Panel Sizes

For homes, the most common solar panel sizes are 60-cell and 72-cell panels. They offer various options ‌to suit different needs and constraints. The right choice depends on a balance of energy requirements, available space, and your budget.