Score only. The Solar Review Module Assessment Criteria compares the SunPower X21 Black solar panel against the industries best known specifications. The result, a solar module comparison with no room for discretionary bias and the transparency you desire. 

.Make and model:  SunPower X21 Black.

Variants:  335 / 390W.

  Efficiency, Cell Enhancer, Design.

  Encapsulate.

GREATER THAN 3.3 IS A VERY GOOD SCORE. The following content for the SunPower X21 Black should be used as a guide only. Individual circumstances and compatibilities should always be taken into account when selecting the right solar panel for any given installation. This content has been built using the Solar Review Module Assessment Criteria 2.0 and above based on available product specifications at the time of writing. 

Design.

SunPower

X21 Black Design; Elite
  • N-type mono.
  • Rear-contact.
  • PERC Enhancer.
  • Glass-laminate (Black).
  • Innovative.
  • InterSolar Runner-Up.
  • TÜV certified.

Durability.

SunPower

X21 Black Durability; Superior
  • Snow load 5400Pa.
  • Front wind load 2400Pa.
  • Rear wind load 2400Pa.
  • Damp heat testing 6000Hrs.
  • Thermal cycle testing 800Hrs.
  • PID Resistant.
  • Salt mist resistance certification
    IEC 61701 (Severity 6).
  • Amonia resistance certification
    IEC 62701.
  • 25mm hail impact at 23m/s.

Efficiency.

SunPower

X21 Black Efficiency; Outstanding
  • 21% Maximum module efficiency.
  • -0.29%°C Temperature coefficient.
  • 0/5% Power tolerance.

Performance.

SunPower

X21 Black Performance; Outstanding
  • 2% degradation in the 1st year.
  • 0.2% degradation per annum.
  • 25-year linear performance warranty.
  • Parts & service performance warranty.

Guarantee.

SunPower

X21 Black Guarantee; Elite
  • 25-year warranty.
  • Parts & service warranty.
  • No authorised installer network.

OVERALL.

SunPower

X21 Black Overall; Elite
  • Design 4.3
  • Durability 4.2
  • Efficiency 5.0
  • Performance 4.8
  • Guarantee 4.3
Outstanding
4.8 - 5
Elite
4.3 - 4.7
Superior
3.8 - 4.2
Very Good
3.3 - 3.7
Good
2.8 - 3.2
Average
2.3 - 2.7
Below Average
1.8 - 2.2
Poor
1.3 - 1.7
Inferior
0.8 - 1.2
Sub-standard
0.8 - 1.2
Awful
0 - 0.2
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Insight:

How was the score for the SunPower X21 Black range of solar panels calculated? By utilising the Solar Review Module Assessment Criteria V2.3 >

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