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Sunpower X21 335 Solar Panels

The Sunpower 335 watt solar panel is one of the highest efficiency PV modules available today. Powered by Sunpower Maxeon solar cell technology, the X21 series provides conversion efficiencies of up to 21.1%. The X21 335 watt has low voltage temperature coefficient and exceptional low-light performance attributes provide outstanding energy delivery per peak power watt.

Sunpower solar panels are only available for purchase with installation by authorized dealers. They are NOT sold separately.

Sunpower X21 335 Prices

We try to make it transparent and easy to compare solar prices, but you can not buy Sunpower panels separately. However, we can compare the real-world Sunpower 335 pricing information that is publicly available from the official reporting site of the California Solar Initiative (CSI) Program Administrators and the California Public Utilities Commission.

  • Average Sunpower X21 335 Cost per DC Watt Installed: $5.62
  • Compare to FreeCleanSolar 8 kW system for $2.25 per watt

  • Sunpower Installation Dates: March 2013 to March 2017
  • Average Rated Power per System: 7.8 kW (7,838 watts DC)
  • Average # Solar Modules per System: 23
  • Average Sunpower 335 System Installation Cost: $43,239
  • Average Cost per Sunpower 335 Module Installed: $1,882
  • Total # Sunpower 335 Modules installed: 1,357
  • Total Sunpower 335 Systems installed: 958

This presents actual costs and program data for Sunpower X21 335 watt modules and systems installed in California. These prices include modules, inverters, mounting, balance of systems (BOS) component and installation labor. Don't pay more than you have to; find some of the lowest prices for high performance solar panels here at FreeCleanSolar.com.


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Review Sunpower X21 335 Specifications

Here is the official datasheet with electrical and mechanical characteristics, test conditions, warranty and certifications for the Sunpower X21 335 watt solar panels, model # SPR-335, SPR-X21-335, SPR-X21-335-BLK.

  • STC Peak Power (+/i5%) Pmax: 335 watts
  • CEC PTC Rating Pmax: 313.7 watts
  • Module Efficiency: 21.1%
  • AC kWh generated based on NREL PV Watts estimate
  • AC power monthly: 41.875 kWh
  • AC power per year: 502.5 kWh
  • Rated Voltage Vmp: 57.3 V
  • Rated Current Imp: 5.85 A
  • Open Circuit Voltage Voc: 67.9 V
  • Short Circuit Current Isc: 6.23 A
  • Maximum System Voltage: 1000 V IEC, 600 V UL
  • Series Fuse Rating: 20 A
  • Solar Cells Technology: 96 mono-crystalline Maxeon Gen III
  • Front Glass: High transmission tempered glass with anti-reflective coating
  • Dimensions: 61.4" x 41.2" x 1.81 inches
  • Weight: 41 lbs
  • Junction Box: IP-65 rated with 3 bypass diodes
  • Output Cables: 34.5 inches, multi-contact connectors
  • Frame Construction: Anodized aluminum alloy type 6063, black
  • Operating Temperature Range: -40F to +185F
  • Maximum Wind and Snow Load: 50 psf, 2400 Pascals, front and back
  • Hail Impact Resistance: 25mm, 1 inch hail at 23 m/s or 51 mph
  • Product Warranty: 10 years
  • Power Warranty: 25 years
  • Certifications: UL 1703, IEC 61216, IEC 61730 Class C Fire Rating


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