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Suntech STP290-60/Wfh
Suntech Brand review

STP290-60/Wfh

290 Wp Polycrystalline
ComparePV verdict

Solid all-round for its segment

Rank 13,599 of 14,129
Compare panels Datasheet PDF
Power (Wp)
290
Weak · bottom 22%
Efficiency (%)
17.20
Typical · median 19.00%
Density (Wp/m²)
171.9
Typical · median 189.9
Temp (%/°C)
-0.380
Typical · median -0.360
Weight (kg)
19.0
Typical · median 20.2 kg
Warranty (yrs)
25
Typical · median 25 yrs

The SuperPoly series consists of 120-cell polycrystalline modules built with half-cut cell technology, designed for installations where consistent output matters despite variable sunlight conditions. Splitting the cells in half reduces losses from current mismatch and lowers electrode resistance, allowing the panels to maintain high conversion efficiency even when part of the surface is shaded. Suntech applies its proprietary current sorting process, which further minimizes mismatch loss within a string - a feature rarely found among competitors in this price segment. The series also stands out for its excellent performance in low-light conditions, which matters on cloudy days and during early morning or evening hours when the angle of incidence is unfavorable. A lower cell operating temperature combined with a favorable temperature coefficient results in smaller power drops on hot days. The construction has passed tests for extreme wind and snow load resistance, while the frame and IP68-rated junction box ensure a tight seal in coastal, desert, and farmland installations. Thanks to high PID resistance and double electroluminescence inspection, the modules maintain stable parameters throughout their entire service life. This is a solution for installers seeking a proven, cost-effective half-cut polycrystalline technology that combines reliability with a long-term manufacturer warranty.

Ranking

1,517 panels in the 190-390 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 17.20% 19.00% Typical 13,516
Power density 171.9 189.9 Typical 13,517
Temperature coefficient -0.380 -0.360 Typical 13,477
Weight per kWp 65.5 61.3 Typical 13,195
Performance warranty 25 yrs 25 yrs Typical 9,912
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 0 caution
Best for

Residential, commercial, shaded-installations and hot-climate.

Notes from the database
  • Efficiency of 17.2% is 4.6pp below the database median (21.8%)
  • 171.9 W/m² power density is 46.2 W/m² below database median (218.1 W/m²) - requires larger installation area
  • Temperature coefficient of -0.38%/°C is 0.08pp worse than database median (-0.30%/°C) - higher losses in summer heat
  • Weight of 19.0 kg (7.5 kg below database median of 26.5 kg) allows easier transport and roof mounting
  • In the top 96% for efficiency among all N-type panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 290 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 17.20 % Typical Segment median 19.00%
Vmpp · Impp 32.30 V · 8.99 A Operating point at max power
Voc · Isc 39.00 V · 9.47 A Sizes the string length
Max system voltage 1000 V Longer strings than 1000 V modules
Dimensions 1684×1002×35 mm · 1.69 m² of roof
Weight 19.0 kg Typical Typical · median 20.2 kg
Cells 120 Polycrystalline
Coefficient Pmax -0.380 %/°C Typical median -0.360 of its segment
Coefficient Voc · Isc -0.321 · 0.050 %/°C
NOCT 42 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 25 years Typical median 25 yrs · median 25 yrs
End-of-warranty output 80.2 % Equals 224 W guaranteed
Degradation 2.50 → 0.70 % First year, then annual

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.380 %/°C against a segment median of -0.360
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Suntech STP290-60/Wfh 290 W 17.20% -0.380 19.0 kg You are here
LNSK-340M 340 W 20.08% -0.360 21.0 kg +50 W, cooler, +2.9 pp
CS3K-330P 330 W 19.90% -0.360 18.5 kg +40 W, cooler, +2.7 pp
CS3K-335MB-AG 335 W 19.90% -0.360 22.3 kg +45 W, +2.7 pp, +5 yr warranty
LNSK-335M 335 W 19.78% -0.360 21.0 kg +45 W, cooler, +2.6 pp
CS3K-325P 325 W 19.60% -0.360 18.5 kg +35 W, cooler, +2.4 pp
LNSK-330M 330 W 19.49% -0.360 21.0 kg +40 W, cooler, +2.3 pp
CS3K-320P 320 W 19.30% -0.360 18.5 kg +30 W, cooler, +2.1 pp
STP295-60/Wfh 295 W 17.50% -0.380 19.0 kg +0.3 pp
STP300-60/Wfh 300 W 17.80% -0.380 19.0 kg +10 W, +0.6 pp
JT440SYK(B) 440 W 22.90% -0.240 23.0 kg +150 W, cooler, +5.7 pp
JT435SYk(B) 435 W 22.70% -0.240 23.0 kg +145 W, cooler, +5.5 pp
SPR-MAX3-400-COM 400 W 22.60% -0.270 19.0 kg +110 W, +5.4 pp, +15 yr warranty
JT430SYk(B) 430 W 22.40% -0.240 23.0 kg +140 W, cooler, +5.2 pp
LEPV 400 400 W 22.31% -0.290 20.0 kg +110 W, cooler, +5.1 pp
NS-360MH-60 360 W 22.12% -0.290 17.0 kg +70 W, cooler, +4.9 pp
NS-360MH-60 360 W 22.12% -0.290 17.0 kg +70 W, cooler, +4.9 pp

Found 114 panels of the same or similar size to this one, within ±10 mm. See them here Found 224 panels of the same or similar size to this one, within ±25 mm. See them here Found 470 panels of the same or similar size to this one, within ±50 mm. See them here Found 814 panels of the same or similar size to this one, within ±100 mm. See them here

About the SuperPoly series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this module's own.

What is the maximum power output of Suntech SuperPoly panels, and how many modules are needed for a typical 5 kW system?
SuperPoly series panels reach a maximum power output of up to 360 Wp. To build a system of around 5 kW, roughly 14 modules are needed. Thanks to half-cut cell technology, the modules maintain high conversion efficiency even under partial shading, allowing for more precise panel layout planning on the roof.
How does half-cut cell technology in Suntech SuperPoly differ from standard full-size cells?
In half-cut cell technology, cells are cut in half, reducing current mismatch losses and lowering electrode resistance. As a result, the SuperPoly panel handles partial shading better, for example from a chimney or antenna, and loses less power than full-cell modules under the same conditions.
What warranty comes with Suntech SuperPoly panels?
The manufacturer provides a 12-year product warranty and a 25-year power output warranty. This means Suntech, a tier 1 manufacturer based in China, guarantees a defined performance level for the panels over a quarter century, which is standard for installations with a long payback period.
Are Suntech SuperPoly panels suitable for coastal or desert installations?
Yes, the frame and junction box are rated IP68, providing resistance to moisture, salt, and dust. The construction has also passed extreme wind and snow load tests, making the modules well suited for coastal, agricultural, and desert installations alike.
What is current sorting in Suntech panels, and why does it matter when connecting modules into a string?
Current sorting is Suntech's proprietary process of grading cells by current before module assembly. This ensures cells with matching electrical parameters are paired together, minimizing mismatch loss within a string. This solution is rarely found in this price segment and translates into higher real-world energy yield.
Do Suntech SuperPoly panels perform well under low irradiance and higher temperatures?
Yes, the SuperPoly series performs well under low irradiance, which matters on cloudy days and during morning and evening hours. Its favorable temperature coefficient also limits power losses on hot days, and high PID resistance ensures stable parameters throughout the module's service life.
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