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Compare prices and reviews of solar providers near you online. Longi solar panel efficiency

Compare prices and reviews of solar providers near you online. Longi solar panel efficiency


    Experience elevated solar power efficiency with LONGi Solar panels. Choose Sunrays Power Brisbane to install your LONGi solar system for superior production and performance. Ideal for quality-conscious commercial and residential clients. Includes excellent solar warranty.

    Install LONGi Solar Panels in Queensland with Sunrays Power for a Highly Efficient and Beautiful Solar System

    A top-rated solar manufacturer in the world, LONGi Solar ranked 72nd on Forbes’ 2022 Global 2000 list. The company has been making semiconductors, solar PV panels, hydrogen, and batteries for many years. They have manufacturing facilities in China, Malaysia, Vietnam, and India, making them the largest manufacturer based on market share. As a leading manufacturer in the solar panel industry in Australia, LONGi’s holds a large market share in our residential solar market. This is backed up by their efficient and impressive panels. As a pioneer in solar technology research and development, LONGi boasts a team of skilled experts who continuously set new records for cell efficiency. Through their innovative use of heterojunction (HJT) cell technology, LONGi Solar has achieved a ground-breaking cell efficiency of 26.81% under laboratory conditions. In addition, LONGi’s panels come with excellent long-term warranties, offering customers the assurance of a quality purchase.

    LONGi Products in Australia

    With high wattage and efficiency, LONGi panels excel in generating electricity from sunlight. Their high-efficiency design ensures maximum energy conversion, allowing you to produce more electricity and maximize the use of limited roof space. Plus, with a remarkable temperature coefficient, LONGi panels outshine others in Australia’s scorching summers, maintaining optimal performance even in high temperatures.

    LONGi Quick Specs

    • Power rating (W): 415W – 540W
    • Efficiency (%): Extremely High. 20.4% – 21.6%
    • Cell technology: Monosilicone
    • Price Bracket: Med-High
    • Most popular panel: Hi-Mo 5
    • LONGi’s Warranty Service and Support: Good 4.6/5
    • Overall Rating: 4.9/5

    LONGi Solar Panels We Endorse

    Out of all the LONGi Solar panels we have two standout favourites, the Hi-Mo 5 and Hi-Mo 6!

    In addition to their remarkable performance, LONGi Solar’s Hi-MO 6 panels are panels that are on the cutting-edge of residential solar panel design and engineering. If you are looking for future-proof panels, you’ll find it in LONGi’s Hi-Mo 6, which offers world-class efficiency levels of 22.8% – higher than any residential panel on the Australian market.

    Due to high international demand and shipping costs, Hi-MO 6 panels may be challenging to purchase in Australia. Those wanting to install Hi-Mo 6 may need to wait to purchase their solar system.

    However, if you’re in the market for LONGi, we highly recommend considering the Hi-MO 5 series as your first choice. When compared to the Hi-Mo 6, Hi-Mo 5 is more cost effective, easier to obtain and are still more efficient than many other popular brands in the Australian market!

    The Hi-Mo 5 boasts an impressive efficiency rating of 21.8% and had received awards for performance. The Hi-MO 5 modules have undergone rigorous testing in demanding conditions, making them highly reliable and were actually designed for utility-scale applications, but they can also be easily adapted for smaller commercial and residential installations. For instance, they are suitable for projects that require distribution across a complex roof shape. These panels are also designed to withstand extreme weather conditions, including storms, hail, heat, and pressure, while maintaining optimal performance. Rest assured that the Hi-MO 5 series is a robust and efficient option for your solar needs.

    LONGi Hi-Mo 5

    Award winning and highly cherished solar panel model with an impressive efficiency rating of 21.8%. Has a proven track record for being one of Australia’s most favoured solar panel models due to it’s resilience when faced with extreme weather conditions.

    LONGi Hi-Mo 6

    Renowned for their exceptional efficiency, reaching an impressive 22.8%. These panels are widely recognized as some of the most efficient solar modules currently available for residential and commercial applications.

    LONGi Solar Panel Warranty Overview

    Depending on the LONGi Solar module you install, LONGi can provide 10, 12, or 25-year Product warranty. Regardless of what module, all LONGi products come with a 25-year Linear Power Warranty at 0.55% linear degradation per year over the next 25 years since it is installed.

    • LONGi Product Warranty: 10, 12, or 25-years – Dependent on Module
    • Linear Power Warranty: 25-years at 0.55% linear degradation

    Our Thoughts about LONGi Solar

    At Sunrays Power, we had the pleasure of visiting LONGi Solar’s production facility and were blown away by their impressive capabilities. As one of the largest solar manufacturers in the world, LONGi Solar sets themselves apart by building everything in-house, from ingots to cells to panel framing. This vertically integrated supply chain ensures top-notch quality throughout the entire production process.

    In addition to their exceptional production capabilities, LONGi Solar’s panels come with great clamping zones, a feature that our solar installers and designers appreciate. These clamping zones make installation on a roof worry-free by eliminating concerns about screw line spacings that may void the warranty. It’s features like this that make us prefer LONGi Solar panels over other brands.

    Why Choose to Sunrays Power to Install your LONGi Solar Panels?

    When you choose Sunrays Power to install your LONGi Solar panels, you’re choosing a team of experienced professionals who has extensive experience installing LONGi Solar panels. We’ve installed LONGi Solar panels for many satisfied customers and can attest to their exceptional quality as well as our own installation quality.

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    Additionally, by choosing us, we will work closely with you to design and install a solar system that meets your specific needs and budget. We take the time to educate our customers about the benefits of solar energy and help them make informed decisions about their investment.

    We also offer competitive pricing and financing options to make solar energy accessible to everyone. Our goal is to help our customers save money on their energy bills and reduce their carbon footprint while providing them with the best possible solar solution. So why choose Sunrays Power to install your LONGi Solar panels? Because we’re committed to providing you with the best possible solar experience.

    We understand that investing in solar energy is a big decision, and you want to work with a team that you can trust.

    That’s why we encourage you to check out our reviews to learn more about our capabilities and what our customers have to say about us. We’re proud of our reputation for exceptional customer service and high-quality installations, and we’re confident that you’ll be impressed too. So go ahead and read what our customers have to say. We think you’ll like what you see.

    Our Testimonials

    Sunrays power installed our solar system 2 years ago. We were impressed by their quality installation tailored to our requirements and budget. Their after install support has been fantastic with follow up phone calls to ensure that we are continually getting the best out of our system.

    I was very impressed with Ronak’s professionalism, he was very attentive to all my questions as well as providing me relevant information and recommendations for my home needs. The entire process was very efficient and easy. The installation was neat, very good pre sales and after sales service. He helped me save a lot on electricity bills. I can simply track my solar generation outputs on my mobile. He did a really great job. Special thanks to Ronak and his team. I would highly recommend Ronak and Sunrays Power to everyone.

    If anyone looking to get Solar PV systems installed at there property, I would recommend to contact Ronak from Sunray’s Power. I contacted Sunray’s Power to find out the best option for Solar Installation, where I spoke to Ronak and the level of service offered by him from my initial call of getting the quote upto getting Installed was an excellent experience. He completed the required assessment remotely and offered me couple of quotes based on my needs and left it for me to make a decision to pick one. We did had few phone calls on the quotes offered and finally I ended up selecting ‘330W Q Cells Q Peak Duo G5 Panels with a Fronius Inverter’ based on my budget. Post selecting the Panels and Inverter he also booked in an installer, who was professional and did an excellent job in installing the Panel and Inverters at my property and also walk me through the functions of the Inverter. Being new in using the system, Ronak also assisted me how to connect the Inverter to the home Internet and monitor the performance of the system via the app on the phone. He also addressed any questions I had from my initial phone call up to monitoring the performance of the system on my Phone post installation. Overall experience was excellent and I would recommend Ronak and his team for this work.

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    We invested in a Solar package by Sunrays Power over 18 months ago through a close contact recommendation, and we have been very happy with the professionalism, transparency, installation quality and follow on service from Ron and his team at Sunrays in Melbourne. The installation experience was seamless and informative, the quality of the installation was perfect, and after sales service and interactions have been great. Rare to see a business provide quality customer service and a quality project. The whole process Sunrays were highly responsive in questions, and conscious to ensure my experience was positive. Their customer service was excellent, and i would recommend them highly as a trusted solar partner.

    After receiving a quote created from aerial photos, an installation supervisor visited the property to do a physical evaluation. That evaluation identified some issues with the initial quoted system. A couple of alternatives were presented which would have cost more, but the initial quoted price was honoured so we ended up with a better system for the same price. The installation went without a hitch including the removal and disposal of the existing solar panels. The system has been running for over 3 months and the power generated has been good and better than expected on those not so sunny days. We are very happy to recommend Sunrays Power for their professionalism and quality of the product selected for us.

    Sunrays power installed my solar late in 2019, was a small discrepancie on how many panels as my roof had an unusual section and they couldn’t mont on it so i ended up with 5.something kw instead of the 6kw. System was jinko panels with a Fronious 5kw inverter with wireless login function and tracking. System has been faultless and performed great, was making excess money for me at 1 stage but with the pay in credit cutback not so much now, i can export over 600kw a quarter and only use 100kw grid, solar will run the house from about 10am to 3pm winterish and from 7am to around 8pm in summer before grid power takes over so that in itself is a great saving, in summer it will run my aircon on medium with no grid usage. Highly recommend Sunrays power. Sorry, no photos of the system. yet.

    I have just recently purchased and had installed my first ever Solar System by the wonderful team at Sunrays Power. Ron and his Installers were so friendly and professional from start to finish. They kept me informed at every step of the way and made me feel so confident that I had made the right choice of Solar System for me. Thanks again Ron. Looking forward to my much smaller electricity bills.

    Its been 3 years since our Solar panel was professionally installed by the people at Sunrays Power and I would highly recommend them to anyone. In fact I did after it was installed to 3 households near me. Not only was the knowledge of the sales person extraordinary about our installation, but the installers, 2 guys did such a good job installing that when the inspectors came they mentioned that we were the first house to be approved by the regulators without any changes in over a 100 other installers. How good is that. It was installed in no time at all in less than a day and we have been seeing the benefits ever since. Our electricity bill has been reduced by 2/3 and we are high users. If you haven’t installed a solar panel yet, why not ask Sunrays Power for a quote. Why, because you deserve a good installer in Solar panels. Thank you Sunrays Power. Regards Ronald

    Highly recommended for the professional advice of making sure from to choose right product for us til we can see benefit of having right product. They did detail analysis from our electricity usage and discussed with our future expansion to get better understanding to advice right product and size to get good rate of return of our investment and explain us in easy language then technical. He has offer two product to choose from and explain advantage of having each for us to take decision. Fast services for installation. Left site cleaned and without any disturbance while installation. Quick response for any query for before or after completing job. Thank you Sunrays Power and specially Ronak Shah for your advice and services. We will consider for our next upcoming projects as well.

    Ronack was extremely informative, nothing was too much trouble. He kept in touch with us to be sure everything was going well. We had a small problem with our billing which was not his responsibility, but kindly he helped us with it. Everything functioned as was promised. Product has been good, service over and above expectations.


    If you want to learn more about how Sunrays Power can help you install LONGi Solar panels, don’t hesitate to get in touch! You can reach out to us through the form below, give us a call, or shoot us an email. We’re always here to answer any questions you have and help you get started on your solar energy journey.

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    Just Some Frequently Asked Questions by Our Clients

    Check out some common questions our clients have asked us in the past. But, if you’ve got a burning question that’s not on this list, no worries! Just shoot us a message, and we’ll be stoked to help you out!

    The total cost of your solar PV system is affected by many factors.

    Generally, most people will have their upfront costs influenced by:

    • The Government/state incentive obtained.
    • Cash vs Finance options.
    • Installation costs – including labour costs.
    • The solar panel brand, type and number of panels installed.
    • Inverter brand, type, size and number of inverters installed.
    • The Racking and Frame system and their components.
    • Roof height, pitch and the material of the roof.
    • After Sales arrangements – such as yearly maintenance agreements or monitoring.

    However, there might be some extra expenses depending on your situation, such as:

    • Meter upgrade or reconfigurations.
    • Switchboard upgrades.
    • Cabling upgrades.
    • Site preparation costs – such as roof or floor restructuring
    • Shade removal – such as trees.
    • Grid application fee (subjected to system size, mostly effects larger commercial systems)

    This is a difficult question that we get asked a lot. The truth of the matter is… it depends.

    There are many factors which could affect how much you pay on your power bill once going solar.

    Some factors could be:

    – Your consumption patterns and behaviours regarding energy consumption.

    Depending on the number of appliances you own, your appliance’s energy needs, when you use electricity, your behaviours regarding energy use – will ultimately determine how much you will save.

    Without knowing these details and actively changing your behaviours, most households will never save as much as they could be saving.

    – Feed-In Tariff

    A Feed-In tariff is an amount your electricity retailer will pay you for exporting your green energy into the grid.

    Households who are approved for export will be the ones who save the most on their electricity bills, as well as gain the most benefit from having solar panels installed.

    It is important to note that some households might not be able to receive a feed-in tariff as there are various requirements or reasons that prohibit a full export of power.

    – Where you live

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    Where you live will affect how much electricity you could be generating.

    For example, if you live in Tasmania, your sunlight hours differ when compared to someone living in North Queensland.

    Because of these differences between sunlight, received, some people will naturally produce more electricity for longer. Minimising your chances of dipping back into the grid for power.

    Some other location factors could affect how much you save, such as shading. This could be from trees, or how much dust you receive. If you live next to a busy road, construction site or train tracks, the constant movement could blow dust onto your solar panels, affecting their performance.

    – Size of your system

    The size of your solar PV system will dictate how much electricity you will generate.

    Therefore, it is essential to install a system large enough to cover your needs and electricity bill.

    If you want to maximise your gains, consider oversizing your panels for added electricity generation.

    The ‘best’ Solar Panels are efficient, having a broad temperature range, and a long warranty.

    There are countless blogs, survey results and opinion pieces that list different brands online. With each promoting a new brand and panel model every year. We try to take away the confusion behind your decision-making process by only selling Clean Energy Council approved products. So, you can rest assured that each brand and model we sell is compliant to Australian standards.

    Inverters are the most sophisticated component of your solar PV system. It is also the component that is most likely to break first. Because of this, you want your inverter to have a low failure rate, a long warranty and a well-established presence in Australia.

    Just like the panels we sell; we only sell Clean Energy Council approved inverters. It is important to remember that you can get a good inverter despite your price range by making sure that the inverter you purchase is CEC approved.

    To secure your system, make sure to choose an inverter brand that has a strong presence in the area that you live in. This is important, as it decreases the shipment time of a new replacement inverter to a few days, rather than having to wait for a month.

    Grid connection is one of the most critical steps in your solar journey.

    To connect to the grid, you need to ask permission from your electricity distributor. This is because the generated Solar energy’s impacts on the performance of the electricity grid.A ‘Network Connection Agreement’ must be lodged to your distributor prior to installation.

    This form is lodged by us on your behalf to your electricity distributor. This form will also dictate if you will be able to export your unused solar power to receive a Feed-In-Tariff.

    If you’re not sure who your distributor is, you can check by looking at your power bill or by calling your retailer.

    It’s well known that the solar industry is competitive. With many of the bigger players willing to undercut the competition.

    We could do that, or, we could be better and offer quality installations, parts and service.

    To uphold this point-of-difference, we will not compromise price with quality. We will not sell you the cheapest systems because we will not cut corners by installing the most inexpensive parts and brands.

    Additionally, price matching or price beating is difficult in the solar industry because no installation is the same.

    For example, price matching or even price beating the same brand of a pen is easy, as they are functionally the same, are made by the same company and no matter who you buy this pen from, the quality is identical.

    This can’t be said for solar PV system installations because there is value added all throughout the installation process, as well as extra services, added post-installation.There are also added costs which could crop up depending on your property (such as switchboard upgrades, rewiring cots and shading removal).

    A Solar System is an Investment.

    We want to do better and protect your investment by providing only the best. We do our research and make sure that the individual parts our installers use to install the system are the best we can get. We don’t price beat, because for us to price beat, we would have to remove the services that would normally come with our installations, or, supply products that don’t meet our quality standards.

    We won’t compromise on our point of difference by cutting corners. We want to do what is best – not what is cheapest.

    If you believe your system is not working, here are some things you can do to find out:

    • Check your inverter – What lights are flashing? What is your output? Try to check it the next day to make sure there is no solar generation.
    • Check the solar circuit breaker – Has it tripped? If it has wait until nightfall and to turn it back on. If it trips the next day, then please call us, as this could indicate a potential serious fault.
    • Shut your solar pv system down and then restart it.
    • If you have a problem that can’t be fixed by doing the above suggestions, please call us and we can come out to check the system (there can be a call out fee if your fault is not based on a warranty claim).
    • Find your original paperwork as you might wish to make a warranty claim.

    For every installation we do, we also hand out a solar user manual which includes instructions on how to check the performance of your system, as well as instructions in what to do when there is a system failure. If you have lost your solar user manual or would like a digital version, please send us an email and we can send through a digital version of your solar user manual.

    Additionally, if you are one of our clients, feel free to call our helpful troubleshooting team on 1800 720 719 and we will help you fix any issues which may appear.

    If your number one reason to install solar panels is to save yourself the grief of ever experiencing another blackout, then we want to be frank and tell you, that is a common misconception within the solar industry.

    Having solar will not automatically save you from blackouts, as it is a matter of public safety. If you want to use power during a blackout, then you will need to install extra system fail-safes.

    To understand why this is needed, we need to get technical.

    The flow of power coming from your solar panels changes regularly, according to the amount of sunlight reaching the panels. Inverters convert the DC power from the solar panels into AC power which matches the frequency and voltage of the grid in order to synchronise the phases of the feed into the grid.

    Of course, your demand for power changes regularly, as appliances are switched on or off. As the grid can provide much more power than your solar system, it is also the back-up power source which allows the flow of power into a property to be stabilised. Together with the grid, your solar system can create a stable flow of power to meet your needs.Without grid connection (or other specific fail-safes), your solar panel’s electricity production will not be stable, causing harm to you and your appliances.

    When a blackout occurs, and the grid can’t stabilise that power, then the same thing would happen if you were not connected to the grid. The supply of power from the solar system into your premises would vary, damaging or causing harm to your equipment, appliances, and even yourself. In order to stop that from happening, the inverter has a failsafe called anti-islanding.

    Anti-islanding is an electrical protection measure that is inside anything that generates energy. Anti-islanding protects us, our properties, and maintenance workers from injury by stopping the production of electricity as well as disconnecting the solar unit from the grid.

    Without this protection, the solar system will continue to generate electricity – becoming an island, surrounded by a sea of unpowered powerlines, allowing your generated power to travel freely along the gridlines.

    Anti-islanding is a safety precaution to protect you, your neighbours, and the utility employees from any live wires that may be touched.

    If you want to use your solar energy during a blackout, speak to our solar energy designers on 1800 720 719 or send us an email on to explore the various options available for your energy goals.

    This depends on the system’s components.

    Most of our solar panels come with a an extended 25 years performance warranty and depending on the product you buy; our panels may have 10 years or 25 years manufacturing warranty. Sunrays Power have further agreements and licenses to provide additional extended warranties for any REC Panel, or Q Cell Panel system which we install.

    For our inverters, we are able to provide a minimum of 5 years warranty on select inverter brands. Additionally, if installed through us, you may be able to register your inverter online (select inverters only) and receive an additional 5 years Parts and Labour warranty on your inverter.

    As part of our solar commitments under the Clean Energy Council, we also provide our clients an additional 5 years workmanship warranty on the whole life of the system.

    Want to know the warranties for a specific inverter brand, solar panel brand, or battery system, email our sales team on, and we will send through all relevant details to you within the next two business days.

    Most insurance companies now consider your solar PV system part of your home, and therefore your solar system will be covered under your current home and contents insurance policy.

    However, for added protection, you will need to:

    • Confirm with your insurance provider that your solar system is covered by your current plan, or can be covered in writing.
    • Update your home and contents insurance to include your solar system once you have installed the solar system.

    The most efficient solar panels in 2023

    If you’re shopping around for solar panels, you’ve probably come across the term “solar panel efficiency”. It’s on practically every solar manufacturer’s website in bold font: “19% Efficiency!” or “Our highest efficiency solar panel!”

    A solar panel’s efficiency rating tells you how much of the sunlight that hits the panel is turned into usable electricity. The higher the efficiency rating, the more sunlight that panel can turn into electricity.

    Solar panel efficiency has been increasing for decades. Today, most home solar panels have efficiency ratings between 19% and 21%. The most efficient solar panels can reach over 22%!

    But, how efficiently your panels operate depends on more than just their rating. Let’s take a closer look at the most efficient panels for homeowners today, how much they cost, and what other factors impact efficiency.

    Find out how much a solar system would cost for your specific home

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    Solar panel efficiency at a glance:

    • Solar panel efficiency is a measure of how much of the sunlight that hits the surface of a solar panel is converted into electricity.
    • Most solar panels today are between 19% and 21% efficient.
    • SunPower, Canadian Solar, and REC Group all have efficiency ratings above 22%, making them the most efficient panels on the residential market today.
    • The type of solar panel, the construction of the panel, and outdoor conditions all impact how efficiently a solar panel operates.
    • The power output rating and the value of the solar panel you choose is more important than the efficiency rating.

    What is solar panel efficiency?

    The efficiency rating of a solar panel tells you what amount of sunlight that hits a solar panel is turned into usable electricity. The higher the efficiency rating, the more sunlight that panel can turn into electricity.

    So, if a solar panel has a 15% efficiency rating, that means 15% of the solar energy within the sunlight that hits the solar panel will be converted into electricity.

    You can get a more in-depth explanation of solar panel efficiency from SolarReviews founder Andy Sendy in this video:

    How efficient are solar panels?

    The median efficiency rating of residential solar panels installed from 2022 to 2021.

    According to the National Renewable Energy Laboratory (NREL), most solar panels installed today have efficiency ratings between 19% and 21%. Solar panels with efficiency ratings close to the 22% mark are considered premium efficiency panels and are only offered by a few manufacturers like SunPower and REC Group.

    That’s a long way from where we were in 1954 when the first silicon solar panels had efficiency ratings of just 6%. Just ten years ago, solar panels were only about 13.4% efficient! We could see even more improvements in efficiency thanks to exciting new advancements like perovskite solar cells, which have the potential to reach efficiency ratings of 50%!

    The most efficient solar panels of 2023

    The following table outlines the most efficient residential solar panels of 2023:

    Table 1. Most efficient solar panels in 2023

    1 SunPower M Series 440 W 22.80%
    2 SunPower X-Series 370 W 22.70%
    3 Canadian Solar HiHero 440 W 22.50%
    4 REC Group Alpha Pure 410 W 22.20%
    5 Panasonic EverVolt H 410 W 22.20%
    6 Maxeon Maxeon 3 420 W 22.2%
    7 Silfab Elite 410 W 21.4%
    8 LONGi HiMO4M 460 W 21.20%

    SunPower has consistently held the number one spot when it comes to efficient ratings, but that could change in the near future. In 2020, SunPower’s manufacturing branch, Maxeon, spun off as its own company. SunPower’s most efficient panels are still manufactured by Maxeon. But in 2023, Maxeon solar panels are becoming available to installers outside SunPower’s network. The break-up could finally dethrone SunPower as the most efficient panel, but they’re still holding strong for now.

    How much do high-efficiency solar panels cost?

    You could spend a few thousand dollars extra for premium efficiency solar panels.

    High-efficiency solar panels tend to come with a higher price tag and can add a premium of over 2,000 to the total cost of your system. So, a 7 kilowatt (kW) solar system using premium efficiency panels might cost around 23,100, while the same system using regular efficiency panels might be closer to 19,900.

    But, the cost of highly efficient solar panels is getting lower, thanks to brands like Trina Solar and LONGi. These Chinese-based companies are making great-quality panels with excellent efficiency ratings for a fraction of the cost of premium brands like SunPower. As these brands develop more products, you could see efficiencies rise while solar panel costs remain the same.

    What factors impact solar panel efficiency ratings?

    Solar panels are manufactured like a layer cake. There’s the front glass sheet, a layer of encapsulant, the solar cells, more encapsulant, a backsheet, and an aluminum frame holding it all together.

    The materials used to make these layers play a major role in how efficiently a solar panel can turn sunlight into electricity. They include:

    Let’s take a closer look at each and how they impact the efficiency of a solar panel.

    Solar cell type

    One of the biggest determinants of solar panel efficiency is the type of solar cell used. Solar cells are the part of the solar panel that turns sunlight into electricity. There are three main types of silicon solar cells:

    • Monocrystalline solar cells are the most efficient and the most commonly used solar cells for residential solar panels.
    • Polycrystalline solar cells are less efficient, usually with ratings below 17%, and are rarely used for new home rooftop solar installations.
    • Thin-film solar cells are the least efficient and typically aren’t used for home solar installations.

    Monocrystalline solar panels are the most common type of solar panel used today because they perform better than other cell types. This hasn’t always been the case, though. Believe it or not, polycrystalline panels were once the most popular because they were substantially cheaper than the alternatives.

    But, monocrystalline technology continued to improve while getting cheaper, making it the best choice for residential solar installations. The shift to monocrystalline panels is a big reason why average efficiency ratings have increased over the years.

    Solar cell construction

    As we said, most solar panels today use monocrystalline solar cells. But, there are different ways in which monocrystalline solar cells can be constructed to make them even more efficient. These include:

    • PERC solar cells: Also called ‘passivated emitter and rear contact cells’, PERC cells typically provide about 1% in added efficiency thanks to a reflective back layer that reflects back any light that may have passed through the cell.
    • HJT solar cells: Heterojunction with intrinsic thin layer cells are just traditional monocrystalline solar cells that have been sandwiched between layers of a different type of silicon that absorbs various wavelengths of light and increases power production. Panasonic and REC Group are known for using HJT solar technology.
    • Half-cut or Split cells: Split-cell technology is exactly what it sounds like. solar cells are cut in half with a high-precision laser, which reduces heat and resistance, thereby increasing overall efficiency.

    Busbars and wiring

    How solar cells are wired together can also impact how efficiently they can generate electricity. If you look at the face of a solar panel, you’ll see a bunch of thin lines. These are a series of copper or aluminum wires that conduct electricity throughout the panel.

    Some solar manufacturers have switched to multi-busbar technology, where multiple ultra-thin busbars are used instead of fewer, thicker busbars. The thinner busbars reduce the amount of shading on the solar cell and allow it to absorb more sunlight, thus increasing efficiency.

    SunPower and Silfab use interdigitated back contact, or IBC cells, where all busbars and wiring are on the backside of the solar cell. This frees up the entire face of the cell to absorb electricity without shading issues. However, IBC cells are complicated and expensive to manufacture.


    If you’ve ever looked at a traditional solar panel, you’ve probably seen the black solar cells surrounded by some white space. That white space is the panel’s backsheet. You may also have seen some all-black solar panels; these panels might have a black backsheet.

    Black backing is popular among homeowners because it gives the panels a sleek, uniform look by blending seamlessly with the color of the solar cells. However, panels with black backing are slightly less efficient than those with white backing because it makes the solar panels hotter. Believe it or not, as the surface of a solar panel gets hotter, its efficiency decreases.

    Do environmental conditions affect a solar panel’s efficiency?

    Everything we’ve talked about so far is specifically talking about a solar panel’s efficiency rating. The efficiency rating is calculated under a standard set of laboratory testing conditions, and unfortunately, solar panels on your roof won’t be getting these ideal settings.

    This means how efficiently your panel will actually be will vary, depending on many factors, including:

    • Temperature: As the surface of a solar panel gets hotter, its efficiency drops. Solar panels actually operate best in cold but sunny conditions.
    • Solar system orientation: In the U.S., solar panels produce electricity most efficiently on roofs facing south. Solar panels facing other directions will get less sunlight, which decreases how efficiently the panel operates.
    • Solar system angle: The ideal angle for solar panels is between 30° and 45°, depending on where you live. If your roof has a very steep or shallow pitch, it might decrease the amount of electricity that solar panels can produce.
    • Shading: Solar panels work best in direct sunlight. If a solar panel experiences any shading, like the shadow from a tree branch, it won’t produce as much electricity.
    • Weather: Solar panels operate best on clear, sunny days. Even a passing Cloud can impact how much electricity the panels generate. Snow accumulation can prevent energy production altogether, so you might need to clear them off if you get a lot of snow.
    • Debris: If you live somewhere that is particularly dusty, or maybe in a place that experiences regular wildfires, debris may accumulate on your solar panels and reduce the amount of sunlight they can turn into electricity. Even something as small as bird poop can cause a drop in solar production. Most often, rain storms will take care of removing anything on your panels, but you may need to consider cleaning them off to maximize electricity production. Most often, rain storms will take care of removing build-up, but you may need to consider cleaning your panels to maximize electricity production.

    Find out if going solar is worth it based on your location

    How is solar panel efficiency calculated?

    When you’re shopping for solar panels, the efficiency rating will be listed on the panel’s datasheet. But how exactly is it calculated? There’s actually a pretty easy formula for calculating solar panel efficiency:

    Efficiency = [Power output of panel / (Area of panel x solar irradiance)] x 100

    When solar panels are tested in the lab under Standard Test Conditions (STC), it’s assumed they will receive irradiance levels of 1,000 watts of sunlight per square meter. Knowing this, let’s calculate the efficiency rating for a:

    350-watt panel with an area of 1.8 square meters:

    Efficiency rating = [350 watts / (1.8 m2 x 1,000 watts per m2)] x 100

    So, this 350-watt panel has an efficiency rating of 19.4%. Not bad!

    Do you really need high efficiency solar panels?

    We’re going to be totally honest with you; a panel’s efficiency rating is not the most important thing to consider. In fact, our top pick for the best solar panel manufacturer of 2023 doesn’t have the highest efficiency panels on the market.

    You can learn more about this from veteran solar expert Will White:

    What you should FOCUS on is the power rating of the panel and the reliability of the brand you’re using. The powering rating tells you how much electricity a solar panel can produce, which considers the panel’s efficiency.

    You also want to consider the brand’s reliability. You want to get solar panels from a company that produces high-quality products that can support you over the 25-year lifespan of the panels, should you need it.

    However, high-efficiency panels may be useful if you have a small roof. Panels with higher efficiencies can produce more power in a smaller area, allowing you to maximize your roof space.

    The following table lists some alternatives to expensive high-efficiency solar panels:

    Qcells Q.Peak DUO Black MK 410 W 20.90%
    Jinko Solar Eagle 66-TR G4 400 W 20.96%
    Trina Solar Vertex S 395 W 395 W 20.80%
    Mission Solar MSE PERC 66 400 W 19.9%
    JA Solar 60-Cell MBB Half-Cell Module 390 W 21%

    Are premium efficiency solar panels right for you?

    Premium efficiency solar panels are the best choice for homeowners with limited roofing space or those who don’t mind spending extra money on top-of-the-line products.

    But, for everyone else, you should consider what solar modules give you the best value for the price. Can you trust the manufacturer? Is the warranty good? You want a solar panel that’s reliable, high-quality, and meets your power needs without breaking the bank. Qcells, LONGi, and Canadian Solar are all great options.

    To better understand how much solar panels can save you, check out our solar panel calculator. From there, you can contact local, reliable solar installers who can help you pick the best solar panel brand for your roof so you can start powering your home with cheap, clean energy.

    LONGi hits 26.81% efficiency for HJT solar cells

    Chinese solar panel manufacturer LONGi announced it has reached an efficiency of 26.81% for its HJT silicon solar cells on full-size silicon wafers through mass production. The record was confirmed by the Institute for Solar Energy Research in Hamelin (ISFH).

    “Improving the efficiency and reducing the LCOE (levelized cost of energy) is the eternal theme of the development of photovoltaic industry. Solar cell efficiency is the beacon of photovoltaic technology innovation. Every 0.01% improvement in solar cell conversion efficiency requires enormous efforts. In particular, crystalline silicon solar cells account for nearly 95% of the current photovoltaic market, so the ultimate efficiency of crystalline silicon solar cells also shows the development potential and direction of the photovoltaic industry, which is of great significance in the entire photovoltaic industry,” said Li Zhenguo, founder and president of LONGi.

    LONGi previously announced a milestone of 25.47% efficiency for these cells in March 2022.

    About The Author

    Kelsey Misbrener

    Kelsey is managing editor of Solar Power World and host of the Contractor’s Corner podcast.

    Комментарии и мнения владельцев

    “Every 0.01% improvement in solar cell conversion efficiency requires enormous efforts. In particular, crystalline silicon solar cells account for nearly 95% of the current photovoltaic market, so the ultimate efficiency of crystalline silicon solar cells also shows the development potential and direction of the photovoltaic industry, which is of great significance in the entire photovoltaic industry,” said Li Zhenguo, founder and president of LONGi.” Interesting, the 26.81% efficiency off of a manufacturing line is impressive. This amount of solar harvest efficiency is pushing the theoritical 30% efficiency of silicon cell with the prospect of tandem or tri layered cells to grab more than 30% of the solar spectrum efficiency. There is more to the solar PV cell and final solar PV panel assembled product. In just the last 10 years so many new technologies have been implemented, the real World use experience will not be fully known for perhaps 20 years of actual in use of the product World wide. It is common for a manufacturer to give one at least a 25 year output specification of 80% up to 90% after 25 years of use and around 82% after 30 years in use as a warranty. This lends to confidence in the purchase of the product. (YET), one must also think about some of the technology being used like; shingling of solar PV cells and using conductive “adhesives” to assemble some panels. The wafer saws that allow thin wafers to be used as solar PV cells, but the thinner cells are more prone to cracking and loss of efficiency over years of heat/cold cycling or even mechanical stress on the solar PV cells in a panel, by being installed. The accelerated test cycles are fairly accurate on MTBF of solar PV cells, when one aggregates years of LID, PID, delta heating/cooling stresses on an assembled panel, then the longivity will be thoroughly tested over actual years of use. Depending on site of installation, hot dry deserts present stress problems as well as cold wet sites that can penetrate panel sealing and create corrosion that can degrade the panel below specifications in only a few years. Over the years introduction of Boron has lessened the effects of LID and PID to allow solar PV panels to have a linear degradition warrany of up to 30 years of use. The long term will determine if conductive adhesives, thin wafer cells and laser annealing will ameloriate cell degradation problems when these panels are actually in use for 30 years.

    LONGi Solar

    LONGi Solar is a Tier 1 manufacturer of solar panels renowned for its monocrystalline technologies and the latest innovations. LONGi was incorporated in 2000 and has focused exclusively on monocrystalline wafers since then.

    Advantages of solar panels from LONGi Solar

    Effectiveness and improved efficiency

    A steadily increasing market share

    The latest certified technologies

    Solar energy for a green world

    Towards the solar future with LONGi Solar

    Thanks to investments in research and development and solutions with low LCOE, LONGi has been defining industrial standards and breaking new world records in recent years. The effectiveness of the solar modules continuously set new world records with deliveries and an increasing market share from year to year.

    Collaboration between Solarity and LONGi Solar is based on professionalism focused on a pro-client approach. We support your plans by helping you accomplish them thanks to our extensive warehouse stock. LONGi Solar photovoltaic panels can be delivered to you anywhere in the world with our reliable and prompt transport services. We will provide you with professional technical support.

    Our partners are invited to take advantage of the regularly organised free professional training sessions and seminars.

    Excellent availability and prices,

    Flexibility and quick delivery

    Technical support, quick response,

    LONGi Solar products in our range

    Hi-MO LR5-72HIH

    Our online shop offers business partners a wide range of LONGi Solar panels for photovoltaic power systems. If you have any questions concerning our range of products, the terms and conditions of purchase, or the possibilities of collaboration, do not hesitate to get in touch.

    Warranty terms and conditions

    LONGi Solar provides a 12-year extended product guarantee for all panels. The performance guarantee for standard panels is 25 years, with 30 years for bi-facial.

    LONGi has opted for a future of clean energy products

    The LONGi Solar philosophy is to gain the maximum from solar energy to build a green world. Today, LONGi is part of a community of world-leading producers of monocrystalline silicon panels. In 2016, they launched mono-PERC modules with integrated PERC technology on monocrystalline silicon with minimal degradation due to light and with improved cell efficiency from 21 % to 24.06 %. The highly efficient cells are cut by IR laser-based half-cut technology. Bi-facial modules utilise incident light on both sides of the panel. At the beginning of 2021, production capacity exceeded 20 GW. Modules with high efficiency can be utilised in a wide spectrum of installations, both commercial and private.

    Solarity is one of the official distributors of LONGi Solar products. Become a leader in the photovoltaic segment thanks to our wholesale services.

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