Types of solar panels: which one is the best choice?
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Most of the solar panels on the market today for residential solar energy systems can fit into three categories: monocrystalline solar panels, polycrystalline solar panels, and thin film solar panels.
The solar cells that make up the panel determine which type it is.Each type of solar cell has different characteristics, thus making certain panels better suited for different situations.
We’ve created a complete guide to monocrystalline, polycrystalline, and thin film solar panels to help you decide which type is right for your home.
Monocrystalline solar panels are the most popular solar panels used in rooftop solar panel installations today.
Monocrystalline silicon solar cells are manufactured using something called the Czochralski method, in which a ‘seed’ crystal of silicon is placed into a molten vat of pure silicon at a high temperature.
This process forms a single silicon crystal, called an ingot, that is sliced into thin silicon wafers which are then used in the solar modules.
Nowadays, there are several varieties of monocrystalline solar panels on the market to choose from. Passivated Emitter and Rear Contact cells, more commonly referred to as PERC cells, are becoming an increasingly popular monocrystalline option. PERC cells go through a different manufacturing and assembly process that increases the amount of electricity the cells can produce.
Bifacial solar panels, another monocrystalline technology, can generate electricity on both the front and back side of a module, and are gaining traction in commercial ground-mounted applications.
Polycrystalline panels, sometimes referred to as ‘multicrystalline panels’, are popular among homeowners looking to install solar panels on a budget.
Similar to monocrystalline panels, polycrystalline panels are made of silicon solar cells. However, the cooling process is different, which causes multiple crystals to form, as opposed to one.
Polycrystalline panels used on residential homes usually contain 60 solar cells.
Thin film solar cells are mostly used in large-scale utility and industrial solar installations because of their lower efficiency ratings.
Thin film solar panels are made by depositing a thin layer of a photovoltaic substance onto a solid surface, like glass. Some of these photovoltaic substances include Amorphous silicon (a-Si), copper indium gallium selenide (CIGS), and cadmium telluride (CdTe). Each of these materials creates a different ‘type’ of solar panel, however, they all fall under the thin film solar cell umbrella.
During the manufacturing process, the photovoltaic substance forms a thin lightweight sheet that is, in some cases, flexible.
Efficiency ratings of monocrystalline solar panels range from 17% to 22%, earning them the title of the most efficient solar panel type. The higher efficiency rating of monocrystalline panels makes them ideal for homes with limited roof space, as you’ll need fewer panels to generate the electricity you need.
Monocrystalline solar panels have their manufacturing process to thank for being so efficient. Because monocrystalline solar cells are made of a single crystal of silicon, electrons are able to easily flow throughout the cell, increasing overall efficiency.
Not only do monocrystalline panels have the highest efficiency ratings, they typically also have the highest power capacity ratings, as well. Most monocrystalline panels on the market today will have a power output rating of at least 320 watts, but can go up to around 375 watts or higher!
Polycrystalline panel efficiency ratings will typically range from 15% to 17%. The lower efficiency ratings are due to how electrons move through the solar cell. Because polycrystalline cells contain multiple silicon cells, the electrons cannot move as easily and as a result, decrease the efficiency of the panel.
The lower efficiency of polycrystalline panels also means they tend to have a lower power output than monocrystalline panels, usually ranging between 240 watts and 300 watts. Some polycrystalline panels have power ratings above 300 watts.
However, new technologies and manufacturing processes have given the efficiency and power ratings of polycrystalline panels a slight boost over the years, slowly closing the performance gap between mono and polycrystalline panels.
Thin film solar panels have incredibly low efficiency ratings. As recently as a few years ago, thin film efficiencies were in the single digits. Researchers have recently achieved 23.4% efficiency with thin film cell prototypes but thin film panels that are commercially available generally have efficiency in the 10–13% range.
In order to meet your energy needs, you would need to install more thin film panels over a large area to produce the same amount of electricity as crystalline silicon solar panels. This is why thin film solar panels don’t really make sense for residential installations where space is limited.
Despite having lower performance specs in most other categories, thin film panels tend to have the best temperature coefficient, which means as the temperature of a solar panel increases, the panel produces less electricity. The temperature coefficient tells you how much the power output will decrease by for every 1*C over 25*C the panel gets.
The standard temperature coefficient for mono and polycrystalline panels typically falls somewhere between -0.3% and -0.5% per *C. Thin film panels on the other hand, are around -0.2% per *C - meaning thin film panels are much better at handling the heat than other panel types.
Monocrystalline panels are the most expensive of the three types of solar panels because of their manufacturing process and higher performance abilities.
However, as manufacturing processes and solar panel technology in general has improved, the price difference between monocrystalline and polycrystalline panels has shrunk considerably. According to the Lawrence Berkeley National Laboratory, monocrystalline solar panels now sell for just about $0.05 per watt higher than polycrystalline modules.
Historically, polycrystalline panels have been the cheapest option for homeowners going solar, without majorly sacrificing panel performance. Low prices allowed polycrystalline panels to make up a significant market share in residential solar installations between 2012 and 2016.
But as we said earlier, the price gap between monocrystalline and polycrystalline panels is narrowing. Now, more homeowners are willing to pay a slightly higher price to get significantly better efficiency and power ratings from monocrystalline panels.
Thin film solar panels have the lowest cost of the solar panel types, largely because they are easier to install and require less equipment. However, they also have much lower performance abilities and require a substantial amount of space to generate enough electricity to power a home.
Plus, thin film panels degrade much faster than other panel types, meaning they need to be replaced more often, which leads to more long-term recurring costs.
Thin film panels have a clean, all-black look. Their thin design allows them to lie flat against roofs, so they are able to blend in more seamlessly. In fact, with some thin film panels, it’s hard to even see the individual cells within the panel. They also tend to have less wiring and busbars, meaning there’s less white space.
However, because they are so inefficient, you would need to cover your entire roof in thin film panels - which may or may not be your style.
Monocrystalline panels have a solid black appearance, making them pretty subtle on your roof. But, the way monocrystalline solar cells are shaped causes there to be quite a bit of white space on the panel. Some manufacturers have worked around this with black packing or shaping the cells differently, but these aesthetic changes can impact both the price and performance of the panels.
Overall, monocrystalline panels still look sleek, but they’re a bit more pronounced than thin film panels.
Polycrystalline panels tend to stick out like a sore thumb. The process in which polycrystalline solar cells are manufactured causes the cells to have a blue, marbled look. This means each individual polycrystalline panel looks substantially different from the one next to it. Most homeowners aren’t too keen on the aesthetics of polycrystalline panels.
Thin film panels tend to have lower wind and hail ratings than mono and polycrystalline panels. So, while thin film panels might look nice at first, one bad storm could cause significant damage.
Monocrystalline solar panels are the best solar panel type for residential solar installations.
Although you will be paying a slightly higher price, you’ll get a system with a subtle appearance without having to sacrifice performance or durability. Plus, the high efficiency and power output ratings you get with monocrystalline panels can provide you with better savings over the lifetime of your system.
If you’re on a tight budget, polycrystalline panels might make more sense for you. We do not recommend thin film solar panels for residential installations - their performance and durability don’t make the low cost worth it, and it’s unlikely you’ll have nearly enough space to install the number of thin film panels you would need to cover your household electricity usage.
There are two things we here at SolarReviews think are more important than solar PV cell type when choosing panels for your home: the brand of solar panels and finding the right solar installer.
Going with a high-quality solar panel manufacturer ensures that you’re installing a great product on your roof, regardless of the type of panel it is. Our official ranking of the best home solar panel brands of 2021 can help you find what solar panels will work best on your roof, without sacrificing quality.
Perhaps the most important thing to consider when going solar is the installer. A solar panel system will be on your roof for at least 25 years, so you need an installer you can trust for two-plus decades! We recommend local, reputable solar installers with high customer review scores as they give the most personalized customer service on solar projects.
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