SunPower is the brand that offers the most efficient solar panels in the industry, converting up to 22.8% of sunlight into electricity.
If you’re looking for a combined roof plus solar system, SunPower now offers OneRoof, which is specially designed for new construction homes and/or complete roof replacements.
- Unlike other solar roofs, the SunPower OneRoof does not use shingles or tiles with built-in photovoltaic cells.
- Instead, SunPower developed a roofing system that attaches directly to their solar panels, taking advantage of their high efficiency.
In other words, the SunPower OneRoof does not mimic the appearance of a traditional roof without solar panels. Instead, it converts solar modules into a roofing system, allowing a faster installation. The OneRoof is an excellent option for new homes, and if you’re considering solar panels along with a roof replacement.
Founded in Silicon Valley in 1985, SunPower is one of the oldest and most experienced companies in the solar industry. The company was founded by Richard Swanson, a researcher and university professor with a PhD in Electrical Engineering from Stanford University.
As of 2022, SunPower has achieved the highest solar panel efficiency in the industry, and they are frequently ranked among the top brands. The company also offers energy storage systems, and they have received over 1,000 patents.
Here we will provide an overview of the SunPower OneRoof, explaining how it integrates with their high-performance solar panels. We will also compare the OneRoof with other solar roof options, considering its advantages and disadvantages.
How Does the SunPower OneRoof Work?
Unlike other solar roofs, the SunPower OneRoof uses traditional modules instead of smaller solar shingles or solar tiles. This means that solar panels will be visible on your roof, but there are two important differences with respect to a traditional installation:
- The SunPower OneRoof achieves a low-profile installation, which means the solar panels are flush mounted along with your normal roof tiles. In other words, the PV system will not add bulk on top of your roof.
- The roofing system and solar panels are separate components, like in a traditional installation. However, they are designed to integrate directly without a racking system.
The OneRoof is a cost-effective solution for new homes, and if you want solar panels for a home that needs a roof replacement soon. By using this system, you can get a new roof and a clean energy source at once. On the other hand, if your current roof is in good condition, installing SunPower panels with traditional racking is a simpler option.
The OneRoof has a tough and durable design, and this is reflected in its technical specifications, which you can check at the SunPower website:
- Roofing materials: The main pans and lateral flashings are made of Galvalume sheet steel, black Kynar 500 coated. The top flashing is made of galvanized steel, and the closure caps are made of EPDM foam.
- Warranty: 25-year product and service warranty, 10-year monitoring hardware warranty, 5-year finish warranty for Kynar 500 coated parts.
- Certifications: UL 2703 safety standard for mounting systems, UL 790 Class A fire rating, UL 580 Class 90 uplift rating, UL 1897 uplift rating up to 125 psf, UL 2582 rating for wind-driven rain.
- Operating temperature: -40°F to 194°F (-40°C to 90°C)
- Roof compatibility: Curved and flat tile roofs, slope from 3:12 to 12:12
Since the OneRoof is designed for SunPower solar panels, the installation can be completed 2-3 times faster. The OneRoof is compatible with two types of SunPower panels, which are compared below: 96-cell E-Series and 96-cell X-Series. Regardless of the solar panel model chosen, the OneRoof is designed for a horizontal or landscape installation.
|SunPower Product||96-cell E-Series||96-cell X-Series|
|Rated Wattage||327W and 320W versions||Up to 370W|
|Efficiency||Up to 20.1%||Up to 22.7%|
|Temperature coefficient||-0.33% per °C||-0.29% per °C|
|Certifications||UL1703 (Type 2 Fire Rating),
IEC 61215, IEC 61730
|UL1703 (Type 2 Fire Rating),
IEC 61215, IEC 61730
|Operating temperature||-40°F to +185°F
(-40°C to +85°C)
|-40°F to +185°F
(-40°C to +85°C)
|Solar cells||96x Maxeon Gen II||96x Maxeon Gen II|
|Weight||41 lb (18.6 kg)||41 lb (18.6 kg)|
|Dimensions||41.2 x 61.3 x 1.8 in||41.2 x 61.3 x 1.8 in|
|Product warranty||25 years||25 years|
|Power output warranty||92% output after 25 years||92% output after 25 years|
The SunPower modules that are compatible with the OneRoof have the same weight and dimensions. The X-Series reaches a higher wattage and efficiency, while having a lower temperature coefficient, and this leads to a higher electricity output over time. However, the E-Series and X-Series are both excellent products with a 25-year warranty from SunPower.
Keep in mind that a high efficiency is only valuable when sunlight can actually reach the solar panels. Ideally, your home solar systems should use roof areas that get the least possible shading throughout the year. This will maximize the electricity output of each solar panel, leading to a shorter payback period and a higher return on investment.
How Much Space Does the SunPower OneRoof Need?
Since the SunPower OneRoof uses traditional solar panels, its space requirements are similar to those of a rack-mounted system. Assuming the same capacity, a OneRoof with E-Series panels will require more space than a system with the X-Series since the E-Series has a lower wattage per panel. An accurate calculation is only possible with a professional assessment of your property and power bills. However, we can estimate the space requirements of each option, considering an 8-kW solar roof.
- To reach 8-kW with 327W E-Series panels, you need to install 25 of them. Since each panel covers 41.2 in x 61.3 in (17.54 square feet), the total area covered is 439 sq.ft.
- When using 370W X-Series panels, you only need 22 to reach 8 kW. In this case, the total area covered by the system is 389 sq.ft.
Considering the lower wattage of the E-Series solar panels, you need to cover around 14% more area compared with a system using the X-Series. Keep in mind that both are excellent products with solid warranty coverage.
Regardless of the solar panel type chosen, you get a 25-year product and power warranty, and you will still have 92% of rated capacity at the end of the warranty period. For comparison, many brands only offer a 10-year product warranty, and 80% of rated power after 25 years of operation.
The X-Series has a slightly better temperature coefficient (-0.29% per °C) than the E-Series (-0.33% per °C). For a temperature rise of 25°C, the output of X-Series modules drops by 7.25%, while the output of E-Series modules drops by 8.25%.
The SunPower OneRoof is a versatile system that adapts to your electricity needs. You can cover exactly the area needed for optimal generation, and you can use a normal roofing system for the remaining space. There are other brands offering complete solar roofs with a combination of normal and photovoltaic shingles, making the installation much more expensive.
The cost of SunPower OneRoof depends on project conditions, and average pricing data is not publicly available. However, the OneRoof uses 96-cell monocrystalline modules from SunPower, which means that part of the system will have costs similar to those of a traditional installation.
According to the data gathered by EnergySage, a home solar system with SunPower modules has an average cost of $3.43 per watt. For comparison, the average installation cost across all solar brands on the EnergySage marketplace is $2.77 per watt.
Does the SunPower OneRoof Have a Good Warranty?
When you install the OneRoof, SunPower offers excellent warranty coverage for both the roofing components and the solar panels. The roofing system integrates seamlessly with 96-cell E-Series or X-Series modules, and it comes with a 25-year product and service warranty. The solar panels themselves come with a 25-year product and power warranty.
The power output warranty offered by SunPower is among the best in the industry. E-Series and X-Series solar panels experience a 2% capacity drop after the first year of operation, and then only 0.25% per year, conserving 92% of their rated output after 25 years of use.
SunPower solar panels can generate up to 45% more energy during their service life, compared with traditional modules meeting the minimum warranty condition expected in the solar industry: 80% capacity after 25 years of operation.
How Does the SunPower OneRoof Compare with other Solar Roofs?
The OneRoof offers two major advantages: it can be installed 2-3 times faster than a home solar system with conventional racking, and it offers the industry-leading efficiency of SunPower modules.
However, the OneRoof is not a solar shingle system strictly speaking: it can be better described as a roofing system that integrates traditional solar panels. As a result, you get the appearance of a solar panel system embedded in your roof, and not the “invisible” appearance offered by other solar roof providers.
If you’re looking for alternatives with solar shingles or tiles that mimic a normal roof, you can check the solar roof systems offered by other brands. Tesla, Forward Labs, SunTegra and Luma Solar are among the leading providers in the US market.
- Tesla and Forward Labs only offer complete solar roofs, combining photovoltaic and normal tiles (non-generating) of identical appearance. This means you cannot use their solar shingles for only a part of your roof.
- SunTegra and Luma Solar offer a more versatile design that can be used in specific roof areas, just like the SunPower OneRoof. You can use traditional shingles or tiles for the rest of your roof.
In a few words, the SunPower OneRoof offers a hybrid solution, which can be described as the combination of traditional solar panels with a built-in solar roof. You get the high efficiency of SunPower modules in a low-profile installation, as long as you don’t mind the appearance of traditional solar panels. However, SunPower does not offer solar shingles with invisible PV cells, like those from competing brands.
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