SunPower manufactures the highest efficiency solar panels
Highest Efficiency Solar Panels
SunPower makes the highest efficiency solar panels you can buy for your roof.
Source: Out of all 2600 panels listed in Photon International, Feb 2012.
 
SunPower holds the world record for the highest efficiency silicon solar panel.
Source: Large-area silicon record, Green, M. A., et al., “Solar Cell Efficiency Tables,” Progress in Photovoltaic, 2014, 22:701-710
 
SunPower® X-Series panels deliver 44% more power.
Source: SunPower 345W panel vs. Conventional Panel (240W, 15% efficient, approx. 1.6 m2)
 
SunPower® E-Series panels deliver 36% more power.
Source: SunPower 327W panel vs. Conventional Panel (240W, 15% efficient, approx. 1.6 m2)
Highest Reliability Solar Panels
Unmatched reliability
Source: #1 rank in  "PV Module Durability Initiative Public Report," Fraunhofer ISE, Feb 2013. Five out of the top 8 largest manufacturers were tested.
 
SunPower's warranty guarantees the most power.
Source: Compared with the top 15 manufacturers.  SunPower Warranty Review, Feb 2013.
 
SunPower panels average only 0.25% power loss per year over the first 25 years.
Source: Jordan, Dirk “SunPower Test Report,” NREL, Oct 2012; Campeau, Z. et al.  "SunPower Module Degradation Rate," SunPower white paper, Feb 2013.
 
27 out of a million panels have been returned under warranty.
Source: Out of 6.5 million panels built with Maxeon® Gen 2 cells installed world-wide, Jan 2006 through June 2012.
 
SunPower predicts its panels will have a useful life of more than 40 years.
Source: "SunPower Module 40 Year Useful Life" SunPower white paper.  Feb 2013.  Useful life is 99 out of 100 panels operating at more than 70% of rated power.
 
SunPower panels ranked #1 in Fraunhofer durability testing.
Source: Fraunhofer ISE,  "PV Module Durability Initiative Public Report," Feb 2013. Five out of the top 8 largest silicon solar panel manufacturers were tested.
 
SunPower Utility-scale power plants with onsite O&M staff, deliver more than 99% availability.
Source: BEW/DNV Engineering, "Availability Evaluation Report," Jan 2013. Requires on-site O&M staff.
SunPower panels produce more energy per rated watt
Highest Solar Panel Energy Production, Year 1
SunPower X-Series panels deliver 8-10% more energy per watt in the first year.
Source: BEW/DNV Engineering  "SunPower Yield Report," Jan 2013, with CFV Solar Test Lab Report #12063, Jan 2013 temp. coef. calculation.  Compared to a Conventional Panel (240W, 15% efficient, approx. 1.6 m2)
 
SunPower E-Series panels deliver 7-9% more energy per watt in the first year.
Source: BEW/DNV Engineering  "SunPower Yield Report," Jan 2013.  Compared to a Conventional Panel (240W, 15% efficient, approx. 1.6 m2)
 
SunPower panels maintain their energy production much better than Conventional Panels in partly-shaded conditions.
Source: PVEvolution Labs "SunPower Shading Study," Feb 2013.  Compared to a Conventional Panel (240W, 15% efficient, approx. 1.6 m2)
 
SunPower X-Series panels have 5x less power drop from a single leaf shading a panel.
Source: PVEvolution Labs "SunPower Shading Study," Feb 2013.  Compared to a Conventional Panel (240W, 15% efficient, approx. 1.6 m2)
 
SunPower E-Series panels have 3x less power drop from a single leaf shading a panel.
Source: PVEvolution Labs "SunPower Shading Study," Feb 2013.  Compared to a Conventional Panel (240W, 15% efficient, approx. 1.6 m2)
SunPower solar panels produce the most energy over the system’s lifetime
Highest Solar Panel Energy Production, 25 Years

1. SunPower X-Series panels produce 21% more energy per rated watt over the first 25 years
2. SunPower X-Series panels produce 75% more energy from the same space over the first 25 years
3. A SunPower X-Series panel produces the same total energy in its first 14 years as a Conventional Panel running for 25 years

Source: SunPower 345W compared to a Conventional Panel (240W, 15% efficient, approx. 1.6 m2), 9% more energy per watt, 0.75%/yr slower degradation. BEW/DNV Engineering "SunPower Yield Report," Jan 2013, with CFV Solar Test Lab Report #12063, Jan 2013 temp. coef. calculation. Campeau, Z. et al.  "SunPower Module Degradation Rate," SunPower white paper, Feb 2013.

1. SunPower E-Series panels produce 20% more energy per rated watt over the first 25 years
2. SunPower E-Series panels produce 60% more energy from the same space over the first 25 years
3. A SunPower E-Series panel produces the same total energy in its first 15 years as a Conventional Panel running for 25 years

Source: SunPower 327W compared to a Conventional Panel (240W, 15% efficient, approx. 1.6 m2), 8% more energy per watt, 0.75%/yr slower degradation. BEW/DNV Eng. "SunPower Yield Report," Jan 2013. Jordan, Dirk “SunPower Test Report,” NREL, Oct 2012. Campeau, Z. et al. "SunPower Module Degradation Rate," SunPower white paper, Feb 2013.