If you’re considering installing solar panels on your roof, one of the first questions you may ask is, “How much do they weigh?”.
While the weight of photovoltaic cells isn’t usually a concern for homeowners, it’s still something to keep in mind when deciding.
This article will examine the weight of solar arrays and analyze the aspects that contribute to their overall mass.
We’ll also provide tips for installing solar panels on your roof.
So, if you’re curious about how much weight your solar panel installation will add to your home, keep reading!
How Much Do Solar Panels Weigh?
Most solar panels weigh between three to four pounds per square foot. With a typical figure of 40 pounds per 60-cell solar panel, the 3×8 arrangement (total of 24 solar panels) would weigh 960 pounds.
While that sounds like an enormous weight, remember that they are very flat and spread out, and each solar panel weighs a manageable 40 pounds. It’s just that adding them all up at once piles on the weight fast, but it’s not a stack—it’s a layout.
The hardware and mounting hardware also slightly add weight to hold the solar panels in place, increasing the combined weight.
Suppose you are not sure your roof can bear the weight of the solar panels. In that case, you can seek professionals like architects or structural engineers to evaluate your roof’s strength and integrity.
You’d need to seek commercial installation if you own an office building, but several roofing companies offer both residential and commercial.
If the professional agrees the roof can safely bear the installation of the solar panels, they will give you a certificate of approval.
However, if the roof isn’t strong enough, they will give you recommendations on fortifying your roof. Possibilities include bracing the rafters or beams further or replacing some of the roofs.
Roofing companies installing solar panels can also offer an informal assessment of your roof’s strength, so you don’t have to incur the expensive fee of a higher-priced professional.
In general, most detached homes can support residential solar panels. You can check your local listings for solar installers, and they can advise you of the best solar panel system.
With their experience installing solar panels, they can also advise you about the weight of solar panels and how much they cost. Finally, they’ll tell you how many watts you can get from your new solar panels.
Overview of Solar Panel Popularity
In this era of climate uncertainty, solar panels are making headway using free solar energy and renewable energy. In the United States, solar power makes up 116 million metric tons of carbon dioxide annually.
That’s like planting two billion trees.
Enter residential solar panel systems. They’ve been around a long time, and their manufacturing is only improving each year.
Many homeowners wonder how to save on energy bills. Many look to installing solar energy panels as a possible solution, especially if they live in areas with lots of sunlight.
But how much work is it to install them on your roof? What are the solar panel weights, and can your roof support the weight? What’s the typical solar panel size if you worry your roof is too small?
As you’d expect, there’s a lot of variation among solar panels. Much depends on the brand, technology, materials, and particularly the latest manufacturing techniques from the different solar panel manufacturers, making things smaller and more compact each year.
What Are the Different Types of Rooftop Solar Systems?
Photovoltaic Panel System (PV Cells)
Typically, the average weight of a photovoltaic panel (also known as a thin-film panel) is 40 pounds but may range from 33 to 55 pounds.
However, more context is needed. For example, what is the solar panel weight per square foot?
This statistic may be more meaningful for you in figuring out if your roof can bear the weight of solar panels.
For residential photovoltaic panels, the typical weight distribution is four pounds per sq foot, quite manageable for most residential roofs.
Monocrystalline Solar Panel System
While more common in commercial settings, some residences do have them. While they are heavier than polycrystalline solar panels, typically weighing 50 pounds each, they generate very efficient and powerful energy (as expected for large-scale commercial solar installations).
Since they were among the first solar panels to be developed, they have a long history of innovation and are the most advanced in inefficiency.
Over the years, the manufacturers of these solar panels have steadily lightened the load per square foot while at the same time generating more energy output.
Polycrystalline Solar Panel System
The newest type of solar panel to hit the market benefit the most from advanced technology, starting with the latest concepts. However, they were modeled after the monocrystalline solar panels, attempting to duplicate their sheer power while being far cheaper to produce.
Today, they are still the cheapest type of solar panels produced, making them more affordable. In addition, its typical weight is 42 pounds, which puts them closer to the range of photovoltaic panels while being much cheaper.
Another advantage is that since this type of solar panel is heavily promoted, its manufacturers are making more significant strides in energy output.
The Dimensions of Average Solar Panels
The dimensions, not just the weight, are essential as well. First, it answers the question: will it fit on my roof? Second, it will also answer the question: what is the weight distribution per square foot?
Regardless of the type of solar panel technology, average solar panels usually come in two standard dimensions:
· 60-cell panels: 3.25 feet by 5.50 feet
· 72-cell panels: 3.25 feet by 6.42 feet
The component solar cell is a 6-inch by 6-inch square. So the only difference between the two standard dimensions is that they’re arranged in different patterns.
The 60-cell panel system is six solar cells wide and ten solar cells long. The 72-cell panel system is six cells wide by 12 cells long, making them about a foot longer.
There are also smaller, more compact models that use fewer cells.
Calculating How Many Solar Panels You Need
The typical American household would require about 867 kWh of electricity per month. (kWh = kilowatts per hour)
A kilowatt is a power measurement, while a kilowatt-hour is an energy measurement. So, for example, if you use your 1,000-watt vacuum cleaner for one hour, you’ve used up to 1 kWh.
Interestingly, an energy-intensive device like a clothes dryer can reach 1 kWh quickly, while a low-maintenance device like a television monitor can take a long time to hit 1 kWh.
Experts have calculated that a 6.5 kW solar array system (for example, the entire setup of all panels would generate 6.5 kW of power, with typical sunlight during the month) would meet this requirement of 867 kWh per month.
Remember, there are a lot of variabilities, as we know too well from forecasting the weather! However, these ballpark numbers help us move forward on best practices.
Here’s the range of watt power for the two standard dimensions:
· 60-cell panels: 285 to 315 watts per panel
· 72-cell panels: 335 to 375 watts per panel
Without going into too many calculations, from experience, a typical solar system would use 18 to 23 panels to meet this 6.5 kW power requirement, which helps meet the stated 867 kWh energy need per month.
Let’s now look at two precise configurations using the standard dimensions, which fall within the above energy requirements.
Since the 72-cell panels are more extensive, we would only need a set of 2 panels in rows by nine columns (18 panels in all). However, for the 60-cell panels, we would need a set of 8 panels by three panels (24 panels in all).
Remember, these are just suggestions. For example, if your roof is more of a square shape, you could arrange the 72-cell panels by three rows and six columns instead, still meeting 18 panels.
Here’s the final computation of numbers answering your questions as to space and shape needs and helping you understand solar panel size:
· 2×9 72-cell panels: about 29 feet by 13 feet (without rounding off, 375.4 square feet)
· 3×8 60-cell panels: about 26 feet by 16.5 feet (429 square feet)
Will the Solar Panels Damage My Roof?
There are some special considerations for differing kinds of roofing materials.
- Corrugated steel roofs. Those can use brackets as mounting equipment specifically designed for the wavy shapes of the corrugated steels and are widely available in hardware stores. The solar panels will not damage the rooftop when installed.
- Asphalt shingles. The danger to the roof from installing the solar panels is from drilling holes in the roof, which increases the possibility of leaks if nothing further is done. It is best to put flashing around the drilled holes to prevent leaks.
- Standing seam roofs. Typically you can use clamps to mount solar panels; such methods do not require drilling into the rooftop.
- Flat roofs. Since such roofs are flat, there is not as much necessity to secure the solar panels since there is no angle. Instead, you would use ballast roof mounts, which are very easy since they involve using specially manufactured cinder blocks that can secure solar panels.
As discussed, the solar panel’s weight distribution is four pounds per sq foot. Since the panels are flat, the weight is nicely spread out on the rooftop rather than exerting undue pressure upon one point.
A common question is if mounting solar panels onto a roof will void a warranty by the roof manufacturer. Sometimes it would, especially for older warranties, but the solar panel company often gives you their warranty, which should put concerns to rest.
If you have any older roof that needs replacement, you can double your benefit by having the same roofing company install the new roof and the solar panels. In addition, they’ll give you many a pro tip on how to proceed.
Most roofs can support the additional weight of a solar installation, but you should get your roof inspected if you are unsure.
Remember to check again with the structural engineer at roofing experts, and they’ll guide you with your brand-new solar panels!
How Much Do They Weigh Per Square Foot?
Residential panels and commercial solar panels weigh 24.73 kilograms.
Weight Of Solar Panels Per m2
The typical solar panels and mounting equipment weight is between 10 and 20 kilograms per square meter.
This is well within the tolerances of most roofs, meaning there is no need to worry about the extra weight causing any damage.
The weight of the panels is often used as an advantage, as it helps to hold the panels in place during high winds.
The main thing to remember is that the system’s total weight will vary depending on the panels’ type and size.
As a result, it is essential to consult with a professional before making final decisions. You can be sure that they will safely and securely mount your solar panel system.
Installing Solar Panels
Solar panels are a great way to save money on your energy bill and do your part to help the environment.
However, it is essential to understand solar panel size before installing solar panels.
Solar panels come in various sizes, and the size you need will depend on the amount of energy you want to generate.
Start calculating your average daily energy usage to determine how big solar panels you will need.
Once you know your energy usage, you can consult a solar panel installer to find the right size for your needs.
With a little planning, you can easily find your home’s right solar panel size.
60-cell or 72-cell solar panels are typically utilized for residential solar installations. However, only 72-cell panels are used for commercial installations.
The average solar panel weighs about 3 – 4 pounds per sq foot. This is insignificant and can be easily installed on a new roof or onto an existing rooftop system.
Generally speaking, most residential solar panels weigh around 40 pounds, although there will be some variation in weight depending on the specific material and brand.
The panels’ added weight is manageable for commercial installations and will likely only add up to 10 pounds per square foot for roofs with a slight slope (less than 5 degrees).
When installing your own residential solar energy system, keep this in mind.
If you’re considering adding solar power to your home, make sure that all of these factors align before making any final decisions so that installation goes smoothly without any added confusion.
How much does a 300-watt solar panel weigh?
These panels weigh between 35 and 50 lbs.
How much does a 250-watt solar panel weigh?
This solar panel weight is typically at least 50 lbs.
How much does a 72-cell solar panel weigh?
These weigh as much as 50 pounds or 22.6kg.