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SunPower Solar Panels: Review

Updated: Jun 5


SunPower solar panels are one of the most frequently requested solar panel brands on the Solar Era, and for good reason. SunPower panels are often the most efficient (read: powerful!) products on the market today, and they offer an industry-leading warranty. For many years, SunPower has been a fully-integrated solar shop: manufacturing solar cells & panels, and then offering sales and installation services for residential and commercial applications as well. Recently, SunPower announced that they’re spinning off their manufacturing arm into a new company–Maxeon–to focus on installing solar panels.

In the mean time, Solar Era’s SunPower reviews take a look at the technical specifications of SunPower solar panels as compared to other manufacturers to answer the question, once and for all, of whether SunPower is actually the best solar panel brand on the market. If you’re a residential homeowners, consider their high-wattage P-Series panels, which specifically come with integrated string inverters to cut down on installation time and costs.


How SunPower P-Series solar panels compare to other panel manufacturers


As you evaluate overall solar panel quality, there are four key metrics that you should consider: efficiency, performance, warranties, and price. To help you with your decision, Solar Era has developed SunPower reviews for each metric, along with a comparison of SunPower solar panels (including the esteemed SunPower P-Series) against the other leading panel manufacturers offered.


Efficiency

The term “solar panel efficiency” refers to how well a solar panel can convert sunshine into useful electricity. Given the same conditions, a high-efficiency solar panel can produce more electricity than a lower-efficiency panel of the same size. For this reason, a higher efficiency rating is generally preferable.


SunPower solar panels are the most efficient panels currently available on the market in the Singapore. While the majority of solar panels fall in the 14% to 19% efficiency range, SunPower’s products are much more efficient – between 18% and 22.8%. If efficiency is your top priority, the technical specifications of SunPower solar panels are unparalleled.


Performance (temperature coefficient): SunPower P-Series

For this portion of Solar Era’s SunPower reviews, we use the temperature coefficient as an indicator of panel performance. The temperature coefficient represents how well your solar panel can handle less-than-ideal conditions. Solar panels, like other electronics, perform their best when they are kept cool (ideally around 25° C/77° F). You can use the temperature coefficient to get a sense of how your panel’s performance will change during hot sunny summer days.


For every degree above 25° C (77° F), your solar panel’s electricity production will decrease by its temperature coefficient. For example, SunPower’s SPR-P3-480-UPP panel has a temperature coefficient of -0.34%/°C. This means that, if the panel’s temperature increases by one degree from 25° C (77° F) to 26° C (79° F), its electricity production will be reduced by -0.34%. If its temperature increases all the way to 35° C (95° F), electricity production will decrease by 3.4%.


Ideally, you want the lowest temperature coefficient possible. SunPower’s solar panels offer some of the best temperature coefficient ratings on the market today, between -0.38 and -0.29.


Warranties

Whether you’re buying a TV, a car, or solar panels, the manufacturer should stand behind their product with a strong warranty. A solar panel’s materials warranty (sometimes referred to as the product or equipment warranty) guarantees that it will be replaced in the event of equipment failure due to manufacturing defects or environmental issues.


Most solar panel manufacturers offer a 10-year materials warranty, but the best solar panels come with a 12, 15, or even 25-year warranty. In keeping with SunPower’s industry-leading position in the other metrics we’ve assessed, the company offers a 12-year and 25-year warranty against any defects in their products.


Every solar panel’s production naturally degrades over time. The performance warranty is a manufacturer’s guarantee that your solar panels’ production won’t degrade too quickly. In addition to a leading materials warranty, SunPower offers one of the best performance warranties of any solar panel manufacturer we’ve reviewed. Most solar panel brands offer a performance warranty stating that their panels will still be producing at somewhere between 80% and 83% of their original capacity after 25 years. By comparison, SunPower’s performance warranty is 85% after 30 years – a full 2% to 4% higher than most other panel manufacturers offer.


What is P Series?

As described in detail earlier the Performance or P series panels use the unique shingled cell design with 7 long cells in parallel. This design offers are most more cost effective and offer additional shade tolerance when partially shaded. The thin singled PERC cells based on the common P-type silicon are also more flexible and less prone to micro-cracking which is a common issue with conventional full-size square cells. The P series are available in 475W to 500W power ratings.


Despite being based on standard P-type silicon SunPower still offers an impressive 30 years performance warranty as well as a 12 years manufacturer’s warranty.



Shingled Cells

Shingled cells are an emerging technology which use overlapping thin cell strips that can be assembled either horizontally or vertically across the panel. Shingled cell are made by laser cutting a normal full size cell in to 5 or 7 strips and layering them in a shingle configuration using rear side connection adhesive. The slight overlap of each cell strip hides a single busbar which interconnects the cell strips. This unique design covers more of the panel surface area as it doesn’t require front side busbar connections which partially shade the cell, thus increasing the panel efficiency much like IBC cells explained below.



How to find the best price on SunPower solar panels

SunPower panels are, without a doubt, some of the best solar panels available today. When Solar Era ranked the best solar panels on the market, our SunPower reviews were the highest of any panel brand.


If you have a limited amount of space and need to maximize your solar panel system’s production, you can’t go wrong with an installation that includes SunPower solar panels. However, not every homeowner needs the most efficient panels available on the market. If you have enough space for a larger system, installing slightly less efficient panels may give you the performance you need at a slightly better price.


The best way to determine whether SunPower solar panels are the best solar panels for your home is to review multiple quotes with different solar equipment options before making a decision. When you compare all of your options with Solar Era, you’ll find the right combination of price and quality that meets your needs. When registering, simply note in your profile that you’re interested in receiving quotes that include SunPower solar panels for your home. We are the qualified, pre-vetted solar installers of SunPower’s certified solar installer network, which means you can be confident that every aspect of your solar system installation meets the highest standards.