Ideal for roofs where space is at a premium or where future expansion might be needed.

Designed to deliver the most energy in demanding real-world conditions, in partial shade and hot rooftop temperatures.^1,2,4

SunPower^® Signature^™ Black X-Series panels blend harmoniously into your roof. The most elegant choice for your home.

Designed to deliver consistent, trouble-free energy over a very long lifetime. ^3,4

The SunPower Maxeon Solar Cell is the only cell built on a solid copper foundation. Virtually impervious to the corrosion and cracking that degrade conventional panels. ³
Same excellent durability as E-Series panels. #1 Rank in Fraunhofer durability test.⁹ 100% power maintained in Atlas 25+ comprehensive durability test.¹⁰

X-Series residential panels convert more sunlight to electricity by producing 38% more power per panel1 and 70% more energy per square foot over 25 years.^1,2,3

High year-one performance delivers 8–10% more energy per rated watt.² This advantage increases over time, producing 21% more energy over the first 25 years to meet your needs.³

• All comparisons are SPR-X21-345 vs. a representative conventional panel: 250 W, approx. 1.6 m², 15.3% efficiency.
• Typically 8–10% more energy per watt, BEW/DNV Engineering “SunPower Yield Report,” Jan 2013.
• Specifically 8-10% extra energy per watt, BEW/DNV Technology " Yield Report," Jan 2013, with CFV Solar Test Lab Report #12063, Jan 2013 temp. coef. computation.
• SunPower 0.25%/yr degradation vs. 1.0%/yr conv. panel. Campeau, Z. et al. “SunPower Module Degradation Rate,” SunPower white paper, Feb 2013; Jordan, Dirk “SunPower Test Report,” NREL, Q1-2015.
• “SunPower Module 40-Year Useful Life” SunPower white paper, May 2015. Useful life is 99 out of 100 panels operating at more than 70% of rated power.
• Highest of over 3,200 silicon solar panels, Photon Module Survey, Feb 2014.
• 1% more energy than E-Series panels, 8% more energy than the average of the top 10 panel companies tested in 2012 (151 panels, 102 companies), Photon International, Feb 2013.
• Compared with the top 15 manufacturers. SunPower Warranty Review, May 2015.
• Some restrictions and exclusions may apply. See warranty for details.
• X-Series same as E-Series, 5 of top 8 panel manufacturers tested in 2013 report, 3 additional panels in 2014. Ferrara, C., et al. "Fraunhofer PV Durability Initiative for Solar Modules: Part 2". Photovoltaics International, 2014.
• Compared with the non-stress-tested control panel. X-Series same as E-Series, tested in Atlas 25+ Durability test report, Feb 2013.
• Standard Test Conditions (1000 W/m² irradiance, AM 1.5, 25° C). NREL calibration Standard: SOMS current, LACCS FF and Voltage.
• Based on average of measured power values during production.
• Type 2 fire rating per UL1703:2013, Class C fire rating per UL1703:2002.
• See salesperson for details.