Pros / There is little or no maintenance with these solar panels. If you choose, you can rinse them with water or just wait for rain to clean them.

Cons / You have few options for contacting the company if you have questions.

 Verdict / Suntech gives you good durability, an unusual but lengthy warranty on power output and easy maintenance. Unfortunately, contacting the company is not as simple as it could be.

You get durability with Suntech STP255S-20/Wdb solar panels, which can withstand a covering of snow weighing 113 pounds per square foot. In addition, these sleek black monocrystalline solar panels can generate a solar efficiency of 15.7 percent, which is a fairly healthy figure in the industry.

These Suntech panels offer a maximum power wattage of 250 watts, maximum power voltage of 30.8 volts and a maximum power current of 8.28 amps. There are 60 cells per module, with a covering of tempered glass and frame of anodized aluminum alloy. These solar panels are simple to maintain because they need no particular cleaning other than rainwater, but can be rinsed with water if any dirt, dust or leaves settle on them.

The Suntech STP255S-20/Wdb solar panels can withstand temperatures of 40 degrees below zero and up to 185 degrees F.

With these Suntech solar panels, you get a somewhat unorthodox warranty that is different from the standard guarantees on workmanship and power output, which generally are 10 years and 25 years, respectively.

Instead, you get a 10-year warranty on workmanship with these solar panels. As far as power output, Suntech’s warranty states it will cover the panels for five years ensuring 95 percent of their original power output, for 12 years at 90 percent power output and 18 years at 85 percent. Suntech’s warranty provides 25 years of coverage at 80 percent power output.

This Suntech solar panel model offers you relatively standard dimensions of 64.56 inches in length, 39.06 inches in width and 1.37 inches in depth. Each of these panels weighs 40 pounds, which is the lightest of the panels in our product lineup.

If you have questions, you can contact the company by phone or email. Unfortunately, there is no live chat option or company blog for more information, which is unfortunate since Suntech has been a force within the solar industry since its inception in 2001 and by now has established a worldwide presence in the solar market.

  • Solar Efficiency
  • Time to Recoup Investment
  • Warranty
  • Max. Power Wattage
  • Max. Power Voltage
  • Max. Power Current
  • Panel Cells
  1. The amount of electricity a panel converts from sunlight per surface area.
    More is Better
  2. 5  Suntech STP255S-20/Wdb
    15.7 Percentage
  3. 16.0 Percentage
  4. 15.9 Percentage
  5. 15.21 Percentage
  6. Category Average
    15.29 Percentage


Suntech Power is well known worldwide for its solar panel innovation. The Suntech STP255S-20/Wdb solar panels give you an unusual but lengthy warranty, a healthy solar efficiency percentage and good durability. One drawback is the relatively limited contact you get with the manufacturer.

Specifications and Benchmarks


Minimum Temperature
Maximum Temperature
Cover Materials
Tempered Glass
Frame Materials
Anodized Aluminum


Warranty Product & Workmanship
Warranty Power at 95-97% (Years)
Warranty Power At/Above 87% (Years)
Not Specified
Warranty Power at 90% (Years)
Warranty Power at 80% (Years)
Maximum Load Capacity (Pounds Per Square Foot)
Impact Resistance (Hail at Wind MPH)
Not Specified

Solar Efficiency

Solar Efficiency (percentage)
Maximum Power (Watts)
Maximum Power Voltage (Volts)
Maximum Power Current (Amps)
Cell Technology Type
Number of Cells

Overall Cost & Benefit Comparison

Average Total Cost
Time to Recoup Investment (Years)

Help & Support


Cost Comparison Details

Cost Per Panel
Number of Panels for Sample Homes
Total Panel Costs
California Home Scenario
Panels + Installation Cost
Total Federal Tax Credit
California State Rebate
Total Estimated Cost After Credits
Monthly Electric Bill Savings
Wisconsin Home Scenario
Panels + Installation Cost
Total Federal Tax Credit
Wisconsin State Rebate
Total Estimated Cost After Credits
Monthly Electric Bill Savings


Length (Inches)
Width (Inches)
Depth (Inches)
Weight (Pounds)