The information on our website is general in nature and is not intended as a substitute for competent legal, financial or electrical engineering advice. Solar panel efficiency is just one thing to consider when shopping for solar panels. Some other things to consider are the power output rating, the warranty, and the brand of solar panels. All rights reserved. Here’s a list with the most efficient monocrystalline solar panels. A polycrystalline solar panel (in blue) in front of a monocyrstalline solar panel (in black). However, recent mono PERC cells with MBB and the latest heterojunction (HJT) cells have achieved efficiency levels well above 20%. Models and specifications may vary depending on country - *Updated July 2020. Reviews and information on the best Solar panels, inverters and batteries from SMA, Fronius, SunPower, SolaX, Q Cells, Trina, Jinko, Selectronic, Tesla Powerwall, ABB. So, if you plan to use high efficiency solar panels, keep in mind that your solar panel installation could end up costing you more money than if you used standard efficiency panels. Here are some popular, highly reviewed standard efficiency solar panels: Despite the good reviews and popularity of standard efficiency panels, there are some clear-cut advantages of high efficiency solar panels - one of which being that they will produce more electricity over the lifetime of the solar system. LG also produce the most efficient standard (monofacial) panel at 21.4%; the closest rival is Sharp at 20%. Terms of Use Thus, the more efficient your solar panels (and the more sunlight they will have), the more they will be able to generate electricity. Sonnen founded in 2010 is the leading Germany lithium battery system manufacturer and is the largest residential battery company in Europe. Polycrystalline vs. monocrystalline solar panels, New invention turns food waste into solar energy, Tesla solar roof: Updates and comparing costs to conventional solar, Solar panel efficiency: most efficient solar panels in 2021. Login. REC, Sunpower, and LG make the most efficient solar panels for home installations Not all solar panels are created equal. * List of the most efficient solar panels announced and expected to reach high volume production during 2020 - Residential 60 to 66 cell size format size panels only - Updated Sept 2020, * Based on standard size 60 (120) cell, or 96 & 104 cell residential panels. Top 5 Most Efficient Panels on the Market Today. Catherine is a researcher and content specialist at SolarReviews. Do not sell my details Temperature coefficient The temperature coefficient tells you how well your solar panels will perform in less-than-ideal conditions. These two new entries are located at the end of the October list. Larger cell sizes have a greater surface area and when combined with the latest cell technologies such as multi-busbar (MBB), PERC and tiling ribbon, can boost panel efficiency up to 22%. In this video, we give you the list of the most advanced and cutting edge solar panels in 2020. Higher efficiency panels generate more energy per square meter and thus require less overall area. What’s the latest solar roof news and is it worth the cost? Since premium efficiency panels already start with a high efficiency rating, as they degrade, they will still have a relatively high efficiency. Some manufacturers such as LG and SunPower even offer warranties with 90% or higher retained power output after 25 years of use. Namely, Phono Solar’s module from TwinPlus series with 20.71% and LG’s NeoN 2 model with 20.6% efficiency. The solar cell type, design and configuration all have an impact on panel efficiency - Click to enlarge. While standard-quality panels are generally able to convert about 18% of the sunlight that hits the panel into usable electricity, the most efficient solar panels bump that number all … Plus hybrid and off-grid solar system reviews and information articles on how solar and battery systems work. That means you can now get solar that's cheaper and more efficient than ever! Start comparing solar quotes with high-efficiency equipment on the EnergySage Marketplace. REC recently released the Alpha series using high performance HJT N-type cells which boosted efficiency close to the level of IBC cells. Let’s find together what solar panels are the most efficient. This means they can produce more energy over time as compared to standard efficiency panels. For example 12 x high efficiency 360W solar panels, such as those from LG or SunPower with a 21.2% conversion efficiency, will provide up to 1100W (1.1kW) more total solar capacity than the same number and size 270W panels with a lower 16.5% efficiency. Click to enlarge, Power temperature coefficient is measured in % per °C - Lower is more efficient, Polycrystalline cells - 0.39 to 0.43 % /°C, Monocrystalline cells - 0.36 to 0.40 % /°C, Monocrystalline IBC cells - 0.29 to 0.31 % /°C, Monocrystalline HJT cells - 0.26 to 0.27 % /°C. However, as explained below, a new industry trend emerged in 2020 towards much larger panel sizes built around new larger size cells which increased panel efficiency and boosted power output up to an impressive 600W. We explore that - and more - with our breakdown of solar panel efficiency. She has strong interests in issues related to climate and sustainability which led her to pursue a degree in environmental science at Ramapo College of New Jersey. But how does it really work and how long with it last? Power output vs Temperature chart shows reduced efficiency at higher cell temperatures - Image credit LG. There’s nothing else around that can offer such high efficiency. We compare the Tesla Powerwall 2 with the popular LG Chem RESU lithium battery which considered the leading competitor to the Powerwall, plus the well known German Sonnen and the large Chinese manufacturer BYD. However, these types of solar panels aren’t typically used for residential solar installations. The higher the efficiency rating, the more sunlight your solar system can turn into electricity to power your home. The most efficient solar panels also tend to be the most expensive on a cost-per-watt basis, so these may not always be the best solar panels for you. Register The cell design plays a significant role in panel efficiency. Most solar panels used today have efficiencies between 15% and 20%. Monocrystalline panels have an average temperature coefficient (or loss) of -0.38% /°C, while polycrystalline panels are slightly higher at -0.40% /°C. The most efficient solar panels available today are approximately 23%. Instead, high-efficiency panels allow you to fit more solar … This is because they turn more of the sunlight that hits the roof into solar energy. As previously explained, the most efficient standard size panels still use high performance N-type IBC or Interdigitated Back Contact cells which can achieve up to 22.6% panel efficiency and generate an impressive 370 to 400 Watts. In most cases, you can install high-quality standard efficiency solar panels while meeting all your electricity needs at a lower cost. Surprisingly, even the colour of the panel protective backsheet can affect efficiency. If you are looking for an efficient solar panel, you are in the right place. Based on detailed lifecycle analysis, most silicon-based solar panels already repay the embodied energy in 2 years. More expensive SunPower Maxeon (N-type) panel Vs conventional multicrystalline 60-cell (P-type) panel. Solar panel efficiency has increased substantially over the last 12 months with most manufacturers announcing new generation multi-busbar (MBB) half-cut cell modules and larger format cells. Many panel manufacturers today are competing for the bragging rights as to the most efficient solar panel. The biggest influences on solar panel efficiency are the type of wiring, the color of the backing, and the type of solar cells used. In most cases, you can get high quality, standard efficiency solar panels and cover all of your electricity needs. SunPower’s Series X is the most efficient solar panel with an efficiency rating of 22.8%. This is only bettered by a Canadian Solar panel which is lower in efficiency. This is also available as a slightly lower powered 390W version. LG have one of the most powerful panels on the market at 395W. Solar panel efficiency measures how much of the sunlight that hits a s solar panel turns into usable electricity. You can edit the text in this area, and change where the contact form on the right submits to, by entering edit mode using the modes on the bottom right. The best solar panels available on the market today are SunPower’s A-Series Residential Solar Panels, which are 22.8% efficient at their maximum. SunPower, LG, and REC Solar make the most efficient solar panels. Luckily there are add-on devices known as optimisers and micro-inverters which can reduce the negative effect of shading, especially when only a small number of panels are shaded. You’ll want to invest in high efficiency solar panels if you have limited roof space and need as few solar panels as possible to produce the most amount of power for your home. ET solar panels are-Cost-effective; Mid-level performance oriented; Reliable Your solar installer will be able to help you find the right solar panels to meet your energy needs. These losses can add up to greatly reduce both panel and overall system performance: Factors which can affect solar panel efficiency and performance: The factors which have the most significant impact on panel efficiency in real-world use are irradiance, shading, orientation and temperature. Key takeaways about solar panel efficiency. What are solar panels, how do they work? Higher temperatures will cause the efficiency to drop, whereas colder temperatures will cause the efficiency to increase. For Example, a high efficiency 360W+ panel could cost $300 or more while a common 300W panel will typically cost closer to $150. That’s because solar panels with multi-junction cells are able to absorb different wavelengths of light, bumping up their efficiency. We review the Tesla Powerwall 2 with advanced features such as liquid cooling and integrated inverter. I find Q CELLS have a smaller footprint than other high output panels, so I can fit more panels on a size constrained roof for a more production and a lower cost. Efficiency does make a big difference in the amount of roof area required. Reviews on this site do not reflect the views or opinions of SolarReviews or its directors or shareholders, nor an endorsement of any third party company. First Solar for instance has a lab record of 22.1% Cd-Te thin film cells, however their panel available in the market is only 16.8% efficiency. The biggest influences on solar panel efficiency are the type of wiring, the color of the backing, and the type of solar cells used. In environmental terms, increased efficiency means a solar panel will payback the embodied energy (energy used to extract the raw materials and manufacture the solar panel) in less time. The rated power of a solar panel, measured in Watts (W), is performed at standard test conditions (STC) and measured at a cell temperature of 25°C. A panel with 60 cells in a half-cell format is doubled to 120 cells, and 72 cells in half-cell format is 144 cells. Many people consider efficiency to be the most important criteria when selecting a solar panel, but what matters most is the manufacturing quality which is related to real world performance, reliability, manufacturers service, and warranty conditions. This is known as the power temperature coefficient which is measured in %/°C. Note, cell temperature can rise as high as 80°C when mounted on a dark coloured rooftop during very hot 40+°C, windless days. Therefore it is very important to try to reduce or eliminate shading if possible. Image source: Jinko Solar. Most solar panels used today have efficiencies between 15% and 20%. Due to the lower current, half-cut panels have much lower resistive losses resulting in increased efficiency and a lower temperature co-efficient which also helps boost operating efficiency. Our SunPower Equinox ® system + SunVault™ Storage is the only complete home solar system that is designed and warranted by one company. A solar panel’s efficiency rating refers to the amount of sunlight the panel can convert into usable energy. This relates directly to the output of a solar panel (in watts). And what high efficiency panels are currently on the market? However, as panel efficiency has increased beyond 20%, payback time has reduced to less than 1.5 years in many locations. The term efficiency is thrown around a lot but a slightly more efficient panel doesn’t always equate to a better quality panel. High efficiency solar panels aren’t necessary for all solar installations. We compare the leading Lithium batteries from Simpliphi and Pylontech against advanced deep-cycle lead-acid batteries from Narada and BAE. Popular half-cut or split cell modules have double the amount of cells with roughly the same panel size. The most efficient solar panels of November 2020 have two new entries as compared to the October list. Then in August at the SNEC PV Power Expo in China, JinkoSolar unveiled a 610W version of their current Tiger Pro panel while Trina solar proposed a 660W panel is on the horizon. Right: closeup of a more efficient N-type 12 multi busbar cell from a LG Neon 2 335W panel. Visit our community discussion about the best solar panels in our solar forum, detailed article on manufacturing solar cells, Home solar battery systems - Comparison and costs, Tesla Powerwall 2 Vs LG chem RESU Vs Sonnen ECO Vs BYD. The efficiency of the solar panel depends on how well a solar panel can convert sunlight into electricity. Although in the case the leading manufacturers such as LG, Sunpower and REC the more expensive panels have higher performance, lower degradation rates and generally come with a longer 'manufacturer' warranty period, so it is often a wise investment. Overall panel efficiency can be influenced by many factors including; cell temperature, irradiance level, cell type, and interconnection of the cells. The large 13.5kWh storage capacity and new backup capability make this one of the leading home batteries on the market. Rising cell temperature reduces power output by a specific amount for every degree above 25°C (STC). 14-22% is an acceptable efficiency range for panels produced by major manufacturers. This is perfect for rooftops with limited space and can also allow larger capacity systems to be fitted to any roof. Privacy Policy I currently sell BLACK Q.PEAK Q CELLS which have 340 watts per panel and efficiency of 19%. The Tesla solar roof has changed over the years. * Standard 60 to 66 cell (120-HC) panel sizes and 96/104 cell residential panels. Let's say you have an off-grid solar system. Common 60 cell poly or polycrystalline panels generally the least efficient and lowest cost panels. The answer may surprise you! The LG bifacial panel is also the most efficient in … There are a few other solar panel manufacturers that produce premium efficiency panels, which all clock in with efficiencies above 20%. Click to enlarge image. At the same time, the cost of solar has continued to decrease. Panel efficiency is calculated by the power rating divided by the total panel area, so just having a larger size panel does not always equate to higher efficiency. Due to the many recent advances in solar cell technology over the last 5 years, average panel conversion efficiency has increased from 15% to 20%. For Installers Then, you don’t have to worry about paying a premium for the extra efficiency. Most premium efficiency solar cells are made of monocrystalline silicon. For this reason, the following list of the most efficient solar panel in international solar PV industry is made to help you decide which would be the best for your needs. You can't afford to throw away energy… Total Panel efficiency is measured under standard test conditions (STC), based on a cell temperature of 25°C, solar irradiance of 1000W/m2 and Air Mass of 1.5. The most efficient solar panels on the market generally use either N-type (IBC) monocrystalline silicon cells or the another highly efficient N-type variation, heterojunction (HJT) cells. We disclaim any liability for any damages or loss arising from your use thereof. However in real world use, cell temperature generally rises well above 25°C, depending on the ambient air temperature, wind speed, time of day and amount of solar irradiance (solar energy - W/m2). We review the latest Sonnen battery systems which are now being manufactured in South Australia. Generally cell temperature is 20-30°C higher than the ambient air temperature which equates to approximately 8-12% reduction in power output. Choosing the best solar battery is not easy due to the wide variety of battery types available, each with different characteristics and applications. Solar panel efficiency is a measure of the amount of solar energy (irradiation) which falls on a panel surface and is converted into electricity. An invention by winner of the James Dyson Sustainability award, Carvey Maigue, uses luminescent particles in food waste to turn UV light into electricity. Read more about selecting the best quality solar panels here. The new huge range of LG chem RESU batteries might have positioned LG as the leader in home energy storage options. Investing in high-efficiency solar panels isn’t about getting more production from your system. One important thing to consider when shopping for solar panels are the solar panel efficiency ratings. Panel power is measured in watts and efficiency, how well panels convert sunlight to electricity. Monocrystalline N-type IBC - 20 to 22.6%, * Approximate average solar PV cell efficiency comparison chart - Mono and poly silicon types. Additionally, bifacial solar panels, which can absorb light on both the front and the back of the panel, have higher rates of energy production and higher efficiency ratings than traditional solar panels. Amazingly, there were close to 20 manufacturers at SNEC showcasing panels rated over 600W with the most powerful panel being the Jumbo 800W panel from JA solar. You have a refrigerator/freezer, and a bunch of other stuff to run at your beautiful remote cabin. We discuss what is required to build a quality and reliable off-grid solar system and highlight the best inverters and battery storage systems for off-grid installations. Monocrystalline panels are usually more efficient — but they also tend to cost more. Australia. Panels built using advanced IBC cells are the most efficient, followed by half-cut and multi busbar monocrystalline cells, mono shingled cells and finally standard 60 cell (4-5 busbar) mono cells. The most efficient solar panels available in 2020 use the high purity N-type IBC cells manufactured by SunPower and LG. Very efficient panels above 21% featuring N-type cells are generally much more expensive, so if cost is a major limitation it would be better suited to locations with limited mounting space, otherwise you can pay a premium for the same power capacity which could be achieved by using 1 or 2 additional panels. SunPower Maxeon3 400W Panel In 2019 the SunPower launched their 400W panel; the most efficient commercially available solar panel in the world at 22.6% panel efficiency. The list for most efficient solar panels available in the market is as follows. The efficiency (%) of a panel is calculated by the maximum power rating (W) at STC, divided by the total panel area in meters. Most other manufacturers currently use the more common P-type mono-PERC cells; however, several large volume manufacturers, including JinkoSolar , Longi Solar and Trina , are now starting to shift to … This large jump in efficiency resulted in the power output of a standard size panel to increase from 250W up to 340W. As highlighted in the table below, most other manufacturers have moved from standard mono cells to the more efficient half-cut mono PERC cells. When it hit the market in 2017, SunPower ’s X-22 Series solar panel dethroned all competitors in the residential market for the title of the most efficient solar panel. Some solar panels in the market have efficiencies over 20% - these are known as high efficiency solar panels. You can also use our solar panel calculator to get a personalized estimate for how much a solar installation would cost for your home. Key features include silicon type, number of busbars (MBB), and passivation type (PERC). As explained below, panel efficiency is determined by two main factors; the photovoltaic (PV) cell efficiency, based on the cell design and silicon type, and the total panel efficiency, based on the cell layout, configuration and panel size. Learn more: Polycrystalline vs. monocrystalline solar panels. Cell efficiency is determined by the cell structure and base silicon material used which is generally either P-type or N-type. #1 SunPower SunPower is the world’s largest producer of crystalline solar panels. However, high efficiency panels using N-type cells are will almost always outperform and outlast P-type cell panels due to the lower degradation rates, so the extra cost is usually well worth it in the long term. The most efficient solar panels on the market generally use either N-type (IBC) monocrystalline silicon cells or the another highly efficient N-type variation, heterojunction (HJT) cells. With a record-breaking 22.8% efficiency, SunPower’s panels convert more sunlight into usable electricity than almost any other commercially available panel. The efficiency of solar panels gives you an idea of how much energy your solar panels will be able to produce. Explore SunPower Equinox ® A common standard size 60-cell (1m x 1.65m) panel with 18-20% efficiency typically has a power rating of 300-330 Watts, where as a panel with higher efficiency panel of the same size can produce up to 370W. (The following lists were made by Solar Plaza and were first published on December 2011 and March 2012 respectively. Best solar batteries. Copyright © 2012 - 2021 - solarreviews.com. Generally cell temperature is 20-30°C higher than ambient air temperature, which equates to approximately 8-12% reduction in total power output, depending on the type of solar cell and its temperature coefficient. The high-cost IBC cells are currently the most efficient (20-22%), due to the high purity N-type silicon cell base and no losses from busbar/finger shading. Plus hybrid inverters, battery sizing, Lithium-ion and lead-acid batteries, off-grid and on-grid power systems. See our detailed article on manufacturing solar cells and panels. Solar Charge Controllers are one of the most affordable and effective devices used to charge battery systems using solar. Sitemap Most Efficient Off-Grid Solar Inverter in the World: Solar power is the future. The previous record of 24 percent was held by a large, 800-square centimetre solar cell produced by a US company, but these new photovoltaic cells aren't only more efficient, they also cover far less surface area, which means they're going to make solar power even cheaper. Below is a list of 5 manufacturers bringing to market some of the highest efficiency residential solar panels in 2020: Increased efficiency also means a solar system will generate more electricity over the average 20+ year life of a solar panel and repay the upfront cost sooner, meaning the return on investment (ROI) will be reduced even further. Melbourne, VIC, It’s important to remember that just because a solar panel is the most efficient, doesn’t mean that it’s the best for your home. RECSolar: Norwegian brand founded in 1996 with over 34 million solar panels manufactured worldwide and with over 8.7 gigawatts produced and powering nearly 17 … Some common factors that affect solar panel efficiency include: For example, monocrystalline panels will have a higher efficiency than polycrystalline silicon panels because of the way electrons flow through the cells. Solar panel efficiency is impacted by many things, but it’s mostly impacted by how the panels are manufactured. Most other manufacturers currently use the more common P-type mono-PERC cells; however, several large volume manufacturers, including JinkoSolar, Longi Solar and Trina, are now starting to shift to the more efficient N-type cells. As solar panels get older, their ability to convert sunlight into solar power drops. Left: closeup of a P-type mono 5 busbar cell from a Trina Honey M plus 310W panel . As solar technology has improved, the average solar cell efficiency rating has continued to increase. The company claims that ET solar panels are quite efficient and meet the needs of residential, commercial, and utility customers. Cell efficiency is calculated by what is known as the fill factor (FF), which is the maximum conversion efficiency of a PV cell at the optimum voltage and current. But what exactly is solar panel efficiency? Here are the older charts for reference. Why should you choose ET solar panels? SunPower’s Series X is the most efficient solar panel with an efficiency rating of 22.8%. Here we highlight the world’s best solar battery systems for homes, businesses and off-grid power systems. All manufacturers produce a range of panels with different efficiency ratings depending on the silicon type used and whether they incorporate PERC, multi busbar or other cell technologies. Solar panel efficiency is a measure of how much sunlight that hits the surface area of a solar panel is converted into usable electricity. There are other variables that influence your solar panels’ efficiency rating, including their temperature. 12 x 270W panels at 16.5% efficiency = 3,200 W, 12 x 360W panels at 21.2% efficiency = 4,300 W. In real world use the panel operating efficiency is dependent on a number of external factors as listed below. Note that all the cell efficiencies tested in lab are more than the corresponding panel efficiencies available in the market. SunPower clearly dominates the market but LG and Panasonic are catching up pretty fast. The half-cut cell configuration is slightly more efficient as the panel voltage is still the same but the current is split between the two halves. Solar panels with different efficiency - Trina 250W poly panel, 300W and 310W mono panels, 315W half-cut 120 cell, 335W multi-busbar and on the far right the high 20.8% efficiency 360W LG Neon R panel. Researchers have reached a new efficiency record for a valuable type of solar panel, inching “tantalizingly” close to a coveted 30 percent milestone. We compare the leading battery technologies including Tesla Powerwall 2, LG Chem RESU, PylonTech, Simpliphi, Sonnen, Gel lead-acid and lead-carbon batteries. Besides producing more energy over time, high efficiency solar panels have the ability to produce more energy per square foot of roof space. The solar cell type, size, design and configuration all have an effect total panel efficiency, July 2019 - Click to enlarge, * List of the most efficiency solar panels including PV cell type - 60 cell size format - Jan 2020. We explain how a MPPT charge controller works and how to select the right size solar charge controller for your solar system. Companies like SunPower (SPWR), LG Solar (066570:KS), First Solar (FSLR), and Panasonic (6752:JP) are among the manufacturers producing the most efficient commercially available solar panels today. So, if a solar panel has an efficiency rating of 15%, that means 15% of the sunlight that hits the solar panels will be converted into electricity. We make no representation as to the accuracy of the information entered by third parties. Here’s a bit more detail about the most efficient solar panels on the market, including maximum power, cell material, and warranties: Canadian Solar’s BiKu CS3U-365PB-FG BiKu CS3U-365PB-FG is a real mouthful, but it can reach up to 23.80% efficiency and a maximum power of 380 watts . The following table lists some of the highest efficiency solar panels on the market: These solar panels have higher-than-average efficiencies, and also come in at a higher price tag. The level of solar irradiance is of course influenced by atmospheric conditions, the latitude and time of year. Solar panel efficiency generally gives a good indication of performance, especially as many high-efficiency panels use higher grade N-type silicon cells with improved temperature coefficient and lower degradation over time. Solar cell efficiency simply refers to the amount of electricity produced in watts divided by the amount of solar energy it absorbs. While there are a variety of various cell sizes under development with the most popular being 166mm, 182mm and 210mm. Premium efficiency solar panels are really only necessary if you have limited roof space, as they can produce more electricity in a smaller area. 60 cell panel (120 HC) : Approx width 0.98m x length 1.65m, 72 cell panel (144 HC) : Approx width 1.0m x length 2.0m, 96/104 cell panel: Approx width 1.05m x length 1.60m, New* 66 cell panel (132 HC) - Approx width 1.0m x length 1.80m, New* 78 cell format (158 HC): Approx width 1.3m x length 2.2m. Monocrystalline IBC cells have a much better (lower) temperature coefficient of around -0.30%/°C while the best performing cells at high temperatures are HJT (heterojunction) cells which are as low as -0.26% /°C. Most solar panels sold in 2021 have efficiencies between 15% and 20%, according to the National Renewable Energy Laboratory (NREL). A black backsheet might look more aesthetically pleasing, but it absorbs more heat resulting in higher a cell temperature and increases resistance which in turn slightly reduces total conversion efficiency. The larger cells combined with new larger panel formats have enabled manufacturers to develop extremely powerful panels with ratings up to 600W. To decrease manufacturing costs, gain efficiency and increase power output, manufacturers have started moving away from the standard 156mm (6”) square cell wafer size in favour of larger wafer sizes. A high efficiency solar panels and cover all of your electricity needs and 72 cells in a format! We compare the leading Lithium batteries from Narada and BAE to the of... Are competing for the extra efficiency refers to the more efficient — but they also tend to cost.! Is 20-30°C higher than the corresponding panel efficiencies available in the power output of a solar. Highlighted in the market but LG and SunPower even offer warranties with 90 % or higher retained power output,. Solar energy it absorbs depending on country - * Updated July 2020 have two entries... All the cell surface area which does boost overall efficiency solar power drops the purity., their ability to convert the sun ’ s find together what solar panels systems... And a bunch of other stuff to run at your beautiful remote.... Design and configuration all have an impact on panel efficiency is a and. Such as LG and SunPower even offer warranties with 90 % or higher retained power output start comparing most efficient solar panels! 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