SunPower has been a solar panel manufacturer since 1985, and claim to manufacture the highest efficiency solar panels due to Maxeon® cell technology. Most of their manufacturing plants are located in Philippines and Mexico, but they have some manufacturing plants here in the United States. They are owned by a French company called Total. They sell their products through their network of certified installers. They offer three series of solar panels: X, E and P. In the next section, you’ll find a detailed technical analysis of their solar panels based on the information that we extracted from their website. We believe SunPower manufactures top quality and high efficiency solar panels, but that may not always mean that their product is the right solution for your residential solar project. Hence, it is highly recommended to consult with an experienced, licensed and unbiased Energy Advisor to find out which panel type and brand is the right fit for your project application. In order to get the best technical and financial efficiency out of your solar power system installation, you must pick the right solar panels and inverters. Click HERE to pick your trusted Energy Advisor who will guide you through the process.

Now, let’s look at their products details.

  • X Series Solar Panels
    SunPower Efficiency X Series Solar Cells
    Source: us.sunpower.com
    Source: us.sunpower.com
    • X-21-335-BLK
      1. Cell Type: Monocrystalline Maxeon Gen III
      2. Number of Cells: 96 Monocrystalline Maxeon Gen III
      3. Module Wattage (W): 335 Watt
      4. Module Dimensions (L X W X H): 61.3×41.2×1.8
      5. Module Efficiency: 21%
      6. Product Warranty: Limited, 25-Years
      7. Performance Guarantee:
        1. First five years: 95%
        2. After first year: 0.4% annual degradation
        3. 25th year: 88%
    • X-21-345
      1. Cell Type: Monocrystalline Maxeon Gen III
      2. Number of Cells: 96
      3. Module Wattage (W): 345 Watt
      4. Module Dimensions (L X W X H): 61.3×41.2×1.8
      5. Module Efficiency: 21.5%
      6. Product Warranty: Limited, 25-Years
      7. Performance Guarantee:
        1. First five years: 95%
        2. After first year: 0.4% annual degradation
        3. 25th year: 88%
  • E Series Solar Panels
SunPower Efficiency E Series Solar Cells
Source: us.sunpower.com
Source: us.sunpower.com
  • E20-327
    1. Cell Type: Monocrystalline Maxeon  
    2. Number of Cells: 96
    3. Module Wattage (W): 327 Watt
    4. Module Dimensions (L X W X H): 61.3×41.2×1.8
    5. Module Efficiency: 20.4%
    6. Product Warranty: Limited, 25-Years
    7. Performance Guarantee:
      1. First five years: 95%
      2. After first year: 0.4% annual degradation
      3. 25th year: 88%
  • E19-320
    1. Cell Type: Monocrystalline Maxeon
    2. Number of Cells: 96
    3. Module Wattage (W): 320 Watt
    4. Module Dimensions (L X W X H): 61.3×41.2×1.8
    5. Module Efficiency: 19.9%
    6. Product Warranty: Limited, 25-Years
    7. Performance Guarantee:
      1. First five years: 95%
      2. After first year: 0.4% annual degradation
      3. 25th year: 88%
  • P Series Solar Panels. P Series are used mainly for the commercial projects based on our studies and these panels are designed to be more affordable than other series.
    • P17-350-COM
      1. Cell Type: Multicrystalline
      2. Number of Cells: 96
      3. Module Wattage (W): 350 Watt
      4. Module Dimensions (L X W X H): 81.4×39.3×1.8
      5. Module Efficiency: 17%
      6. Product Warranty: Limited, 25-Years
      7. Performance Guarantee:
        1. First five years: 97%
        2. After first year: 0.6% annual degradation
        3. 25th year: 82.6%
    • P17-345-COM
      1. Cell Type: Multicrystalline
      2. Number of Cells: 96
      3. Module Wattage (W): 345 Watt
      4. Module Dimensions (L X W X H): 81.4×39.3×1.8
      5. Module Efficiency: 16.7%
      6. Product Warranty: Limited, 25-Years
      7. Performance Guarantee:
        1. First five years: 97%
        2. After first year: 0.6% annual degradation
        3. 25th year: 82.6%
    • P17-340-COM
      1. Cell Type: Multicrystalline
      2. Number of Cells: UNK
      3. Module Wattage (W): 340 Watt
      4. Module Dimensions (L X W X H): 81.4×39.3×1.8
      5. Module Efficiency: 16.5%
      6. Product Warranty: Limited, 25-Years
      7. Performance Guarantee:
        1. First five years: 97%
        2. After first year: 0.6% annual degradation
        3. 25th year: 82.6%
    • P17-335-COM
      1. Cell Type: Multicrystalline
      2. Number of Cells: UNK
      3. Module Wattage (W): 335 Watt
      4. Module Dimensions (L X W X H): 81.4×39.3×1.8
      5. Module Efficiency: 16.2%
      6. Product Warranty: Limited, 25-Years
      7. Performance Guarantee:
        1. First five years: 97%
        2. After first year: 0.6% annual degradation
        3. 25th year: 82.6%
    • P17-330-COM
      1. Cell Type: Multicrystalline
      2. Number of Cells: UNK
      3. Module Wattage (W): 330 Watt
      4. Module Dimensions (L X W X H): 81.4×39.3×1.8
      5. Module Efficiency: 16.0%
      6. Product Warranty: Limited, 25-Years
      7. Performance Guarantee:
        1. First five years: 97%
        2. After first year: 0.6% annual degradation
        3. 25th year: 82.6%

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