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Suntech STP635S-H66-Nsh+
Suntech Brand review

STP635S-H66-Nsh+

635 Wp TOPCon Bifacial 80%
ComparePV verdict

Strong in heat, no clear weak spot

Rank 1,462 of 14,005
Compare panels Datasheet PDF
Power (Wp)
635
Strong · top 16%
Efficiency (%)
23.50
Strong · top 10%
Density (Wp/m²)
235.1
Strong · top 9%
Temp (%/°C)
-0.280
Strong · top 7%
Weight (kg)
33.1
Typical · median 32.7 kg
Warranty (yrs)
30
Typical · median 30 yrs

Ultra T 2.0 is a PV module series built for investors who care about more than just efficiency, valuing the visual appeal of an installation on a roof or facade just as much. The N-type TOPCon technology in a half-cell layout reduces resistive losses and keeps energy output stable even under elevated module operating temperatures. The distinctive, uniformly black appearance of the components allows the panels to blend harmoniously into building architecture, making this series a natural choice for residential projects where aesthetics matter as much as technical parameters. A double-glass construction with an anti-reflective coated front glass, combined with multi-busbar technology, improves light utilization and current collection, translating into greater long-term reliability. The series also stands out for its resistance to demanding environmental conditions, backed by certifications for salt mist, ammonia, and dust and sand resistance, making it a solid choice for agricultural and coastal sites. A durable anodized aluminum frame together with certified load-bearing capability ensures mechanical stability even in regions with heavy snow and wind loads, while the long-term power warranty provides confidence in the investment for decades to come.

Ranking

1,086 panels in the segment TOPCon 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.50% 22.80% Strong · top 10% 716
Power density 235.1 227.7 Strong · top 9% 741
Temperature coefficient -0.280 -0.290 Strong · top 7% 1,309
Weight per kWp 52.1 53.1 Typical 5,600
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

3 positive · 0 caution
Best for

Commercial and utility-scale.

Strengths
-0.280 %/°C temperature coefficient

Top 7% of the TOPCon 600-650 W segment, against a median of -0.290. Ranked 1,309th in the whole database.

235.1 watts per square metre

Top 9% of the TOPCon 600-650 W segment, against a median of 227.7. Ranked 741st in the whole database.

23.50% module efficiency

Top 10% of the TOPCon 600-650 W segment, against a median of 22.80%. Ranked 716th in the whole database.

Notes from the database
  • Efficiency of 23.5% is 0.7pp above the TOPCon 600-650W median (22.8%)
  • At 235.1 W/m² power density, this panel generates 7.4 W/m² more per unit area than TOPCon 600-650W median (227.7 W/m²)
  • Temperature coefficient of -0.28%/°C matches the TOPCon 600-650W median
  • Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface
  • #716 for efficiency, #1309 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 635 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.50 % Strong Segment median 22.80%
Vmpp · Impp 41.50 V · 15.31 A Operating point at max power
Voc · Isc 49.50 V · 16.08 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2382×1134×30 mm · 2.70 m² of roof
Weight 33.1 kg Typical Typical · median 32.7 kg
Cells 132 · TOPCon Monocrystalline
Bifaciality 80 % Rear output as a share of front
Coefficient Pmax -0.280 %/°C Strong top 7% of its segment
Coefficient Voc · Isc -0.240 · 0.043 %/°C
Product warranty 15 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 555 W guaranteed
Degradation 1.00 → 0.40 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by Suntech in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 635 Wp appear here. The rest cover the whole series.

Linear Power Degradation Curve (30-Year Warranty) Linear Power Degradation Curve (30-Year Warranty) Whole series

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
-
With bifacial gain
-

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

Heat losses
-0.280 %/°C against a segment median of -0.290
-
Bifacial gain
Rear gain over light concrete: -
-

Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.

Filter these
Size
Panel Power Eff. Temp. Weight Difference
Suntech STP635S-H66-Nsh+ 635 W 23.50% -0.280 33.1 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +1.7 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +45 W, lighter, +1.7 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +40 W, lighter, +1.5 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +1.5 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg +35 W, lighter, +1.3 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg +35 W, lighter, +1.3 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg Cooler, lighter, +1.3 pp
STP605S-H66-Nsh+ 605 W 22.40% -0.290 32.4 kg -30 W, -1.1 pp
STP610S-H66-Nsh+ 610 W 22.58% -0.290 32.4 kg -25 W, -0.9 pp
STP615S-H66-Nsh+ 615 W 22.80% -0.280 33.1 kg -20 W, -0.7 pp
STP620S-H66-Nsh+ 620 W 23.00% -0.280 33.1 kg -15 W, -0.5 pp
STP625S-H66-Nsh+ 625 W 23.10% -0.280 33.1 kg -10 W, -0.4 pp
STP630S-H66-Nsh+ 630 W 23.30% -0.280 33.1 kg Very close match
STP640S-H66-Nsh+ 640 W 23.70% -0.290 32.5 kg Very close match
STP645S-H66-Nsh+ 645 W 23.90% -0.290 32.5 kg +10 W, +0.4 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +65 W, cooler, +1.5 pp

Found 1119 panels of the same or similar size to this one, within ±10 mm. See them here Found 1125 panels of the same or similar size to this one, within ±25 mm. See them here Found 1236 panels of the same or similar size to this one, within ±50 mm. See them here Found 1917 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What is the maximum power output of the Suntech Ultra T 2.0 panel?
The Ultra T 2.0 series reaches a maximum power output of up to 735 Wp, placing it among the highest-output monocrystalline modules currently available. This high output comes from large-format half-cut TOPCon cells combined with multi-busbar technology, which reduce current losses and improve energy harvesting across the panel surface. As a result, fewer modules are needed to reach a given system size, lowering mounting and racking costs.
How does the N-type TOPCon technology in the Ultra T 2.0 differ from older PERC panels?
TOPCon is an N-type cell technology that, unlike common PERC cells, is not boron-doped, so Ultra T 2.0 panels experience virtually no LID-related power loss in the first months of operation. A lower temperature coefficient (around -0.29%/°C) means smaller output drops on hot days compared to standard PERC modules. In practice, this results in higher and more stable annual energy yield.
Do Ultra T 2.0 panels perform well in summer, at high roof temperatures?
Yes, thanks to TOPCon technology, Ultra T 2.0 panels have a low power temperature coefficient (around -0.29%/°C), meaning they lose less output than standard PERC panels as module temperature rises above 25°C. This matters especially in summer, when roof surface temperatures can exceed 60-70°C. As a result, the system maintains higher energy output on the hottest days, when demand for electricity is typically highest.
What warranty comes with the Suntech Ultra T 2.0 panels?
The manufacturer provides a 25-year product warranty along with a 30-year linear power output warranty. This means that after 30 years of operation, the panel should still generate no less than about 87% of its original rated power, with less than 1% degradation in the first year alone. This long warranty period makes the Ultra T 2.0 a solid choice for investors planning installations designed to last for decades without module replacement.
Are Ultra T 2.0 panels suitable for coastal installations or agricultural buildings?
Yes, the Ultra T 2.0 series holds certifications for salt mist, ammonia, and dust/sand resistance, confirming its durability under harsh environmental conditions. Salt mist resistance is essential for coastal installations, where salty air accelerates component corrosion, while ammonia resistance matters for installations on livestock buildings and other agricultural sites. This makes the panels a safe choice for both types of applications.
Can Ultra T 2.0 panels withstand heavy snow and strong wind loads?
Yes, Ultra T 2.0 modules feature a sturdy anodized aluminum frame with certified load ratings, confirming their mechanical stability under strong wind and heavy snow loads. The double-glass construction further increases panel rigidity and resistance to deflection compared to standard backsheet modules. These parameters matter when designing installations in mountainous regions or areas with high snow load standards, where choosing the right mounting structure is critical.
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