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Suntech STP-NT11/66QGDF-640
Suntech Brand review

STP-NT11/66QGDF-640

640 Wp TOPCon Bifacial 80%
ComparePV verdict

Strong in heat, no clear weak spot

Rank 1,286 of 14,129
Compare panels Datasheet PDF
Power (Wp)
640
Strong · top 9%
Efficiency (%)
23.70
Strong · top 4%
Density (Wp/m²)
236.9
Strong · top 4%
Temp (%/°C)
-0.260
Strong · top 1%
Weight (kg)
33.1
Typical · median 32.8 kg
Warranty (yrs)
30
Typical · median 30 yrs

The Ultra T 3.0 series represents Suntech's new generation of photovoltaic modules, built around third-generation N-type TOPCon cells featuring advanced edge passivation. What sets this line apart is its proprietary quarter-cut (multi-cut) technology, which drastically reduces the internal current of the cell - resulting in lower resistive losses and significantly reduced hotspot risk, translating into a longer, trouble-free service life for the installation. The bifacial double-glass construction captures light reflected from the ground, boosting real-world energy yield on both pitched rooftops and large-scale ground-mount farms. Ultra T 3.0 panels are engineered to perform in demanding climates - resistance to high temperatures, salt mist, and ammonia makes them well suited for coastal installations as well as agricultural environments. A robust anodized aluminum frame delivers high mechanical strength, backed by certified load-bearing test results, keeping the module reliable under heavy snow and strong wind loads. This is a solution for installers and investors seeking the balance of high efficiency, low annual degradation, and long-term IEC-certified reliability that lowers the real levelized cost of energy (LCOE) over the system's lifetime.

Ranking

1,085 panels in the segment TOPCon 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.70% 22.80% Strong · top 4% 549
Power density 236.9 227.7 Strong · top 4% 553
Temperature coefficient -0.260 -0.290 Strong · top 1% 515
Weight per kWp 51.7 53.1 Typical 5,112
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
-0.260 %/°C temperature coefficient

Top 1% of the TOPCon 600-650 W segment, against a median of -0.290. Ranked 515th in the whole database.

23.70% module efficiency

Top 4% of the TOPCon 600-650 W segment, against a median of 22.80%. Ranked 549th in the whole database.

236.9 watts per square metre

Top 4% of the TOPCon 600-650 W segment, against a median of 227.7. Ranked 553rd in the whole database.

Notes from the database
  • Efficiency of 23.7% is 0.9pp above the TOPCon 600-650W median (22.8%)
  • Power density of 236.9 W/m² packs 9.2 W/m² more into the same footprint vs TOPCon 600-650W median (227.7 W/m²)
  • -0.26%/°C temperature coefficient (median: -0.29%/°C) - retains ~1% more power at high temperatures
  • Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof
  • In the top 4% for efficiency among all TOPCon panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 640 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.70 % Strong Segment median 22.80%
Vmpp · Impp 41.47 V · 15.43 A Operating point at max power
Voc · Isc 49.70 V · 16.22 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 32.8 kg
Cells 264 · TOPCon Monocrystalline
Bifaciality 80 % Rear output as a share of front
Coefficient Pmax -0.260 %/°C Strong top 1% of its segment
Coefficient Voc · Isc -0.220 · 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 88.8 % Equals 569 W guaranteed
Degradation 1.00 → 0.35 % 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 640 Wp appear here. The rest cover the whole series.

Linear power degradation warranty curve Linear power degradation warranty curve 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
-0.260 %/°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 STP-NT11/66QGDF-640 640 W 23.70% -0.260 33.1 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg +10 W, lighter, +1.5 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +40 W, lighter, +1.5 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +35 W, lighter, +1.3 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Lighter, +1.3 pp
WST-675BKX72-A2 675 W 25.00% -0.260 32.1 kg +35 W, lighter, +1.3 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg +30 W, lighter, +1.1 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg +30 W, lighter, +1.1 pp
STP605S-H66-Nsh+ 605 W 22.40% -0.290 32.4 kg -35 W, hotter, -1.3 pp
STP610S-H66-Nsh+ 610 W 22.58% -0.290 32.4 kg -30 W, hotter, -1.1 pp
STP615S-H66-Nsh+ 615 W 22.80% -0.280 33.1 kg -25 W, hotter, -0.9 pp
STP620S-H66-Nsh+ 620 W 23.00% -0.280 33.1 kg -20 W, hotter, -0.7 pp
STP625S-H66-Nsh+ 625 W 23.10% -0.280 33.1 kg -15 W, hotter, -0.6 pp
STP630S-H66-Nsh+ 630 W 23.30% -0.280 33.1 kg -10 W, hotter, -0.4 pp
STP635S-H66-Nsh+ 635 W 23.50% -0.280 33.1 kg Hotter
STP645S-H66-Nsh+ 645 W 23.90% -0.290 32.5 kg Hotter
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +60 W, heavier, +1.3 pp

Found 1144 panels of the same or similar size to this one, within ±10 mm. See them here Found 1150 panels of the same or similar size to this one, within ±25 mm. See them here Found 1261 panels of the same or similar size to this one, within ±50 mm. See them here Found 1942 panels of the same or similar size to this one, within ±100 mm. See them here

About the Ultra T 3.0 series

6 answered

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

How much power does the Suntech Ultra T 3.0 panel generate and who is it for?
Modules from the Ultra T 3.0 series reach a maximum power of up to 670 Wp, placing them among high-output industrial-grade panels. This high unit power lets installers reduce the number of modules needed to hit a target system size, lowering mounting structure and labor costs. It's a strong fit for both large commercial rooftop installations and ground-mounted solar farms.
How does TOPCon technology in the Ultra T 3.0 differ from classic PERC cells?
The 3rd-generation N-type TOPCon cells used in the Ultra T 3.0 offer higher efficiency and a lower annual degradation rate than older P-type PERC cells. Additional edge passivation reduces carrier recombination at the cell edges, resulting in higher energy yield under low-light conditions and a smaller power drop over years of operation.
What does quarter-cut technology bring to the Suntech Ultra T 3.0 panels?
Quarter-cut technology splits each cell into four segments instead of the standard two used in half-cut designs. This significantly lowers the current flowing through each cell fragment, reducing thermal losses and substantially cutting the risk of hotspots, i.e. localized overheating within the module. In practice, this means higher module reliability and lower failure risk from partial shading.
What warranty comes with the Suntech Ultra T 3.0 panels?
Suntech provides a standard 25-year product warranty and a 30-year linear power output warranty on the Ultra T 3.0 modules. This means the manufacturer guarantees a defined minimum power output level over three decades of operation, which is a key factor in ROI calculations and lifecycle levelized cost of energy (LCOE) for the installation.
Are the Ultra T 3.0 panels suitable for coastal or agricultural installations?
Yes, the Ultra T 3.0 series was engineered for demanding environmental conditions. The panels are certified resistant to salt mist and ammonia exposure, making them well suited both for installations located close to the coastline and for agricultural sites, where standard modules could corrode faster.
Is Suntech a reliable solar panel manufacturer worth trusting?
Suntech is a Chinese tier-1 manufacturer with over two decades of presence in the PV market, indicating financial stability and reliability in honoring warranty commitments. Tier-1 status confirms the company uses its own production lines and has a documented track record of supplying large-scale projects, which matters for a long-term, 30-year power warranty.
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