Skip to main content
Suntech STP355-A72/Vfh
Suntech Brand review

STP355-A72/Vfh

355 Wp Polycrystalline
ComparePV verdict

Middle of its segment, weak in heat

Rank 13,289 of 14,129
Compare panels Datasheet PDF
Power (Wp)
355
Weak · bottom 16%
Efficiency (%)
17.60
Weak · bottom 9%
Density (Wp/m²)
176.4
Weak · bottom 9%
Temp (%/°C)
-0.380
Weak · bottom 7%
Weight (kg)
22.5
Weak · bottom 15%
Warranty (yrs)
25
Weak · bottom 22%

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

4,990 panels in the 255-455 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 17.60% 20.80% Weak · bottom 9% 13,423
Power density 176.4 207.9 Weak · bottom 9% 13,410
Temperature coefficient -0.380 -0.340 Weak · bottom 7% 13,477
Weight per kWp 63.4 54.2 Weak · bottom 15% 12,993
Performance warranty 25 yrs 30 yrs Weak · bottom 22% 9,912
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 3 caution
Best for

Residential, commercial and shaded-installations.

Not ideal for

Hot climates, tight roof space and roofs where every square metre has to count.

Watch-outs
-0.380 %/°C temperature coefficient

Bottom 7% of the 255-455 W band, against a median of -0.340. Ranked 13,477th in the whole database.

17.60% module efficiency

Bottom 9% of the 255-455 W band, against a median of 20.80%. Ranked 13,423rd in the whole database.

176.4 watts per square metre

Bottom 9% of the 255-455 W band, against a median of 207.9. Ranked 13,410th in the whole database.

Notes from the database
  • At 17.6% efficiency, this panel is 4.2pp below the database median of 21.8%
  • Power density of 176.4 W/m² is 41.7 W/m² below database median (218.1 W/m²) - needs more roof space
  • At -0.38%/°C, loses 0.08pp more power per degree than database median (-0.30%/°C)
  • Weight of 22.5 kg (4.0 kg below database median of 26.5 kg) allows easier transport and roof mounting
  • Ranked #13423 out of 14129 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 355 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 17.60 % Weak Segment median 20.80%
Vmpp · Impp 39.20 V · 9.06 A Operating point at max power
Voc · Isc 46.60 V · 9.64 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2008×1002×35 mm · 2.01 m² of roof
Weight 22.5 kg Weak Weak · bottom 15%
Cells 144 Polycrystalline
Coefficient Pmax -0.380 %/°C Weak bottom 7% 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 Weak bottom 22% · median 30 yrs
End-of-warranty output 80.7 % Equals 274 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 -0.340
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Suntech STP355-A72/Vfh 355 W 17.60% -0.380 22.5 kg You are here
LNSK-340M 340 W 20.08% -0.360 21.0 kg -15 W, cooler, +2.5 pp
LNSU-405M 405 W 20.06% -0.360 24.5 kg +50 W, cooler, +2.5 pp
CS3K-330P 330 W 19.90% -0.360 18.5 kg -25 W, lighter, +2.3 pp
CS3K-335MB-AG 335 W 19.90% -0.360 22.3 kg Cooler, +2.3 pp, +5 yr warranty
CS3U-395P 395 W 19.90% -0.360 22.5 kg +40 W, cooler, +2.3 pp
LNSU-400M 400 W 19.81% -0.360 24.5 kg +45 W, cooler, +2.2 pp
LNSK-335M 335 W 19.78% -0.360 21.0 kg -20 W, cooler, +2.2 pp
LNSF-400M 400 W 19.76% -0.360 23.5 kg +45 W, cooler, +2.2 pp
STP340-A72/Vfh 340 W 16.90% -0.380 22.5 kg -15 W, -0.7 pp
STP345-A72/Vfh 345 W 17.10% -0.380 22.5 kg -10 W, -0.5 pp
STP350-A72/Vfh 350 W 17.40% -0.380 22.5 kg -0.2 pp
STP360-A72/Vfh 360 W 17.90% -0.380 22.5 kg +0.3 pp
SPR-MAX7-475 475 W 24.00% -0.270 21.1 kg +120 W, +6.4 pp, +15 yr warranty
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg +115 W, +6.1 pp, +15 yr warranty
SPR-MAX7-465 465 W 23.50% -0.270 21.1 kg +110 W, +5.9 pp, +15 yr warranty
MS480NC-HJTPBFT 480 W 22.10% -0.260 23.0 kg +125 W, cooler, +4.5 pp

Found 141 panels of the same or similar size to this one, within ±10 mm. See them here Found 212 panels of the same or similar size to this one, within ±25 mm. See them here Found 329 panels of the same or similar size to this one, within ±50 mm. See them here Found 806 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.
Add to compare