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Suntech Brand review

STP425S-C54/Nshm

425 Wp TOPCon
ComparePV verdict

Solid all-round for its segment

Rank 9,921 of 14,129
Compare panels Datasheet PDF
Power (Wp)
425
Typical for its class
Efficiency (%)
21.80
Typical · median 22.00%
Density (Wp/m²)
217.6
Typical · median 220.2
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
21.0
Typical · median 22.0 kg
Warranty (yrs)
30
Typical · median 30 yrs

Suntech Ultra V Pro Mini series (STPXXXS-C54/Nshm) are compact modules with enhanced power density, designed for maximum yield from limited rooftop space. The application of N-type TOPCon cells translates to more stable performance over time and reduced sensitivity to degradation mechanisms common in older technologies. Thanks to the half-cut (separated cells) structure, the panel handles local shading better, minimizes resistive losses, and supports higher energy production under real operating conditions.

In practice, this means more predictable yields, especially during summer when heat resistance is crucial - the more favorable temperature coefficient characteristic of TOPCon helps here. Additionally, the series prioritizes durability: high resistance to PID and selected encapsulation materials support long-term installation reliability.

This is a smart choice for single-family homes and small commercial installations, where aesthetics, high yield per square meter, and reliable operation for years matter.

Ranking

1,220 panels in the segment TOPCon 400-450 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.80% 22.00% Typical 7,085
Power density 217.6 220.2 Typical 7,235
Temperature coefficient -0.290 -0.290 Typical 2,220
Weight per kWp 49.4 51.5 Typical 2,916
Performance warranty 30 yrs 30 yrs Typical 21
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
  • At 21.8% efficiency, this panel is on par with typical TOPCon 400-450W modules
  • Power density of 217.6 W/m² matches the TOPCon 400-450W median
  • At -0.29%/°C, hot weather performance is typical for TOPCon 400-450W panels
  • At 21.0 kg, weight matches the TOPCon 400-450W median
  • Ranked #7085 out of 14129 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 425 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.80 % Typical Segment median 22.00%
Vmpp · Impp 32.15 V · 13.22 A Operating point at max power
Voc · Isc 38.59 V · 14.17 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1722×1134×30 mm · 1.95 m² of roof
Weight 21.0 kg Typical Typical · median 22.0 kg
Cells 108 · TOPCon Monocrystalline
Coefficient Pmax -0.290 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.250 · 0.046 %/°C
NOCT 42 °C At 800 W/m², 20 °C ambient
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 371 W guaranteed
Degradation 1.00 → 0.40 % 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
-0.290 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Suntech STP425S-C54/Nshm 425 W 21.80% -0.290 21.0 kg You are here
SPR-MAX7-475 475 W 24.00% -0.270 21.1 kg +50 W, +2.2 pp, +10 yr warranty
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg +40 W, hotter, +2.0 pp
JAT54S40-475/LR 475 W 23.80% -0.260 19.3 kg +50 W, cooler, +2.0 pp
TWMNH-48HW475 475 W 23.80% -0.280 23.7 kg +50 W, heavier, +2.0 pp
CHSM48RN(DG)/F-BH-475 475 W 23.80% -0.290 24.5 kg +50 W, heavier, +2.0 pp
AIKO-A475-MCE54Mw 475 W 23.80% -0.260 21.0 kg +50 W, cooler, +2.0 pp
AIKO-A475-MAH54Mw 475 W 23.80% -0.260 21.5 kg +50 W, cooler, +2.0 pp
STP390S-C54/Umh 390 W 19.90% -0.360 22.1 kg Hotter, -1.9 pp, -5 yr warranty
STP395S-C54/Umhm 395 W 20.20% -0.340 21.0 kg Hotter, -1.6 pp, -5 yr warranty
STP395S-C54/Umh 395 W 20.20% -0.360 22.1 kg Hotter, -1.6 pp, -5 yr warranty
STP400S-C54/Umhm 400 W 20.50% -0.340 21.0 kg Hotter, -1.3 pp, -5 yr warranty
STP400S-C54/Umh 400 W 20.50% -0.360 22.1 kg Hotter, -1.3 pp, -5 yr warranty
STP405S-C54/Umhm 405 W 20.70% -0.340 21.0 kg Hotter, -1.1 pp, -5 yr warranty
STP405S-C54/Umh 405 W 20.70% -0.360 22.1 kg Hotter, -1.1 pp, -5 yr warranty
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +85 W, cooler, +3.2 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +70 W, cooler, +3.0 pp

Found 1797 panels of the same or similar size to this one, within ±10 mm. See them here Found 1928 panels of the same or similar size to this one, within ±25 mm. See them here Found 3413 panels of the same or similar size to this one, within ±50 mm. See them here Found 4007 panels of the same or similar size to this one, within ±100 mm. See them here

About the Ultra V Pro mini (STPXXXS-C54/Nshm) 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 the Suntech Ultra V Pro mini panel, and how many panels are needed for a typical 5 kW system?
Panels in the Ultra V Pro mini series (STPXXXS-C54/Nshm) reach up to 445 Wp. For a 5 kWp system, you need about 11-12 units, and thanks to the module's compact dimensions (roughly 1722 x 1134 mm), the series works well on smaller roof areas where high power density per square meter matters most.
How does the TOPCon cell technology in the Suntech Ultra V Pro mini differ from older PERC panels?
N-type TOPCon cells, unlike the P-type cells used in common PERC panels, are far less susceptible to light-induced degradation (LID) and offer a better temperature coefficient. In practice, this means higher and more stable energy yield throughout the system's lifetime, especially during summer when panels operate at high temperatures.
What warranty comes with the Suntech Ultra V Pro mini panels, and what exactly does it cover?
The manufacturer provides a 15-year product warranty against material and workmanship defects, along with a 30-year linear power output warranty. This means that even after three decades of operation, the panel is expected to retain a guaranteed percentage of its initial power, translating into predictable long-term returns on investment.
Are the Suntech Ultra V Pro mini panels PID-resistant and suitable for harsher climate conditions?
Yes, the series features high resistance to potential-induced degradation (PID) thanks to carefully selected encapsulation materials. Combined with the half-cut cell design, which reduces resistive losses, the panels maintain stable performance both in high summer temperatures and in the variable humidity conditions typical of a temperate climate.
Is Suntech a tier 1 manufacturer, and is it a reliable choice for a single-family home roof?
Yes, Suntech is classified as a tier 1 manufacturer, meaning it has an established financial standing and years of production experience in China, which lowers the risk of warranty servicing issues down the line. The Ultra V Pro mini series, with its compact size and clean aesthetics, is a popular choice for single-family homes where both appearance and long-term reliability matter.
Does the half-cut cell design in the Ultra V Pro mini panels matter for partial roof shading?
Yes, splitting cells into halves (half-cut) means that when part of the panel is shaded by a chimney, antenna, or neighboring building, the resulting power loss is smaller than with traditional full-cell panels. This design also reduces resistive losses and improves overall module efficiency under real-world operating conditions.
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