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Suntech STP645S-H66-Nsh+
Suntech Brand review

STP645S-H66-Nsh+

645 Wp TOPCon Bifacial 80%
ComparePV verdict

Efficiency leader, no clear weak spot

Rank 1,073 of 14,005
Compare panels Datasheet PDF
Power (Wp)
645
Strong · top 3%
Efficiency (%)
23.90
Strong · top 1%
Density (Wp/m²)
238.8
Strong · top 1%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
32.5
Strong · top 21%
Warranty (yrs)
30
Typical · median 30 yrs

The Suntech Ultra V Pro 2.0 series is a new generation of bifacial modules designed to squeeze maximum energy out of every square meter of roof or ground-mounted space. The panel is built on half-cut N-type TOPCon cells arranged in a transparent black bifacial design, allowing the rear side of the module to capture light reflected from the surrounding surface and boost real-world energy yield without expanding the installation footprint. The multi-busbar technology improves current collection and reduces resistive losses, translating into higher long-term reliability. The module also stands out for its strong low-light performance, generating power more efficiently than older-generation designs on cloudy days and during morning and evening hours, which matters in Poland's variable sunlight conditions. Its reinforced mechanical construction supports installation in locations exposed to heavy snow and wind loads. The manufacturer backs the series with a 30-year linear warranty and low annual power degradation, making it an appealing choice both for investors in commercial installations and for homeowners seeking a durable solution with a stable return on investment over decades.

Ranking

1,086 panels in the segment TOPCon 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.90% 22.80% Strong · top 1% 351
Power density 238.8 227.7 Strong · top 1% 356
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 50.4 53.1 Strong · top 21% 3,767
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

Residential, commercial and utility-scale.

Strengths
23.90% module efficiency

Top 1% of the TOPCon 600-650 W segment, against a median of 22.80%. Ranked 351st in the whole database.

238.8 watts per square metre

Top 1% of the TOPCon 600-650 W segment, against a median of 227.7. Ranked 356th in the whole database.

50.4 kg per kWp

Top 21% of the TOPCon 600-650 W segment, against a median of 53.1.

Notes from the database
  • Efficiency of 23.9% is 1.1pp above the TOPCon 600-650W median (22.8%)
  • 238.8 W/m² power density - 11.1 W/m² more than TOPCon 600-650W median (227.7 W/m²), more power per roof area
  • At -0.29%/°C, hot weather performance is typical for TOPCon 600-650W panels
  • 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces
  • Ranked #351 out of 14005 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 645 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.90 % Strong Segment median 22.80%
Vmpp · Impp 41.64 V · 15.49 A Operating point at max power
Voc · Isc 50.10 V · 16.37 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 32.5 kg Strong Strong · top 21%
Cells 132 · TOPCon Monocrystalline
Bifaciality 80 % Rear output as a share of front
Coefficient Pmax -0.290 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.250 · 0.046 %/°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 564 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 645 Wp appear here. The rest cover the whole series.

Current-Voltage and Power-Voltage Curves at Varying Irradiance Levels Current-Voltage and Power-Voltage Curves at Varying Irradiance Levels 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
-0.290 %/°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 STP645S-H66-Nsh+ 645 W 23.90% -0.290 32.5 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +1.3 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +35 W, lighter, +1.3 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +30 W, lighter, +1.1 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +1.1 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +50 W, cooler, +1.0 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Cooler, lighter, +0.9 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg Cooler, lighter, +0.9 pp
STP605S-H66-Nsh+ 605 W 22.40% -0.290 32.4 kg -40 W, -1.5 pp
STP610S-H66-Nsh+ 610 W 22.58% -0.290 32.4 kg -35 W, -1.3 pp
STP615S-H66-Nsh+ 615 W 22.80% -0.280 33.1 kg -30 W, -1.1 pp
STP620S-H66-Nsh+ 620 W 23.00% -0.280 33.1 kg -25 W, -0.9 pp
STP625S-H66-Nsh+ 625 W 23.10% -0.280 33.1 kg -20 W, -0.8 pp
STP630S-H66-Nsh+ 630 W 23.30% -0.280 33.1 kg -15 W, -0.6 pp
STP635S-H66-Nsh+ 635 W 23.50% -0.280 33.1 kg -10 W, -0.4 pp
STP640S-H66-Nsh+ 640 W 23.70% -0.290 32.5 kg Very close match
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +55 W, cooler, +1.1 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 warranty comes with the Suntech Ultra V Pro 2.0 solar panels?
The Ultra V Pro 2.0 series comes with a 25-year product warranty and a 30-year linear power warranty, guaranteeing high cell performance over three decades of operation. As a Tier 1 manufacturer, Suntech offers financial stability that supports warranty claim fulfillment, while low annual power degradation ensures a predictable return on investment even after 25-30 years of use.
What does bifacial mean for the Ultra V Pro 2.0, and is it worth it?
The bifacial design lets the rear side of the module capture light reflected from the ground, roof, or bright surfaces, generating extra energy without increasing the installation footprint. Depending on the surrounding albedo, gains can range from a few to over ten percent more annual energy yield. It pays off especially on light-colored ground surfaces, flat roofs with gravel or membrane, and installations mounted higher above the surface.
How does N-Type TOPCon technology in the Ultra V Pro 2.0 differ from older PERC cells?
N-Type TOPCon cells have lower resistive losses and reduced light-induced degradation compared to older P-Type PERC cells, resulting in higher efficiency and longer module lifespan. In the Ultra V Pro 2.0, TOPCon combined with multi busbar technology improves current collection and long-term stability, allowing the panel to reach a maximum power output of up to 650 Wp while maintaining low annual degradation.
Do Ultra V Pro 2.0 panels perform well on cloudy days and in low-light conditions?
Yes, thanks to TOPCon technology the module delivers strong low-light performance, generating energy more efficiently than older-generation designs during mornings, evenings, and cloudy days. This is particularly relevant in Poland's climate, where much of the year features diffused light conditions, and better low-irradiance efficiency translates into higher real-world annual energy yield.
Is the Ultra V Pro 2.0 suitable for installations exposed to heavy snow and strong wind?
Yes, the module features a reinforced mechanical structure designed for locations subject to heavy snow loads and strong winds, making it suitable for both pitched roofs and ground-mounted installations in more demanding climate conditions. This high mechanical durability also supports the long-term parameter stability covered by the 30-year linear power warranty.
How many Ultra V Pro 2.0 panels are needed for a 10 kWp installation?
With a maximum power of 650 Wp per module, roughly 15-16 Ultra V Pro 2.0 panels are needed to reach a system size of about 10 kWp. The high per-unit power output means fewer panels are required to achieve the target system capacity, which shortens installation time and makes more efficient use of available roof or ground space.
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