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Suntech STP425S-C54/Nshkm+
Suntech Brand review

STP425S-C54/Nshkm+

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/Nshkm+) are compact premium-class modules designed for maximum energy production on limited roof space. The use of N-type TOPCon cells translates to more stable performance over time and excellent efficiency in challenging conditions, such as when the installation heats up in summer or operates under variable sunlight. The dual glass (glass-glass) construction increases resistance to micro-cracks, moisture, and mechanical stress, which investors valuing longevity will appreciate. The 108 half-cut cell configuration helps minimize losses and improves module performance under partial shading, such as from chimneys or window frames. In practice, this means higher yields and reduced risk of mismatch in the string.

This is an excellent choice for single-family homes and small commercial buildings, where high power density, aesthetics, and reliability for years matters. It stands out from the competition by combining TOPCon technology with a durable glass-glass structure in a format friendly to rooftops.

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 and shaded-installations.

Notes from the database
  • Efficiency of 21.8% matches the TOPCon 400-450W median
  • 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
  • Weight of 21.0 kg is typical for TOPCon 400-450W panels
  • 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/Nshkm+ 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/Nshkm+) 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 STPXXXS-C54/Nshkm+ panel?
Panels in the Ultra V Pro mini series reach a maximum power output of up to 445 Wp. This is a strong result for a compact 108 half-cut cell format, delivering good power density per square meter of roof. This allows for a higher total installed capacity on limited roof space compared to older-generation modules.
How does the TOPCon technology in the Suntech Ultra V Pro mini differ from standard PERC cells?
The N-type TOPCon cells used in this series feature lower thermal losses and slower power degradation compared to conventional P-type PERC cells. In practice, this means more stable energy production at high summer temperatures and better performance under diffuse or weaker light conditions, such as on cloudy days.
Are Suntech Ultra V Pro mini panels suitable for a pitched roof on a single-family home?
Yes, the Ultra V Pro mini series was designed primarily for single-family homes and small commercial buildings. Its compact format and high power density allow more wattage to fit on limited pitched roof space, while the dual glass construction handles wind and snow loads typical of these installations well.
What warranty comes with the Suntech Ultra V Pro mini panels?
The manufacturer provides a 15-year product warranty and a 30-year linear power output warranty. This means the panel is expected to maintain a guaranteed percentage of its original performance for three decades, giving investors confidence in the long-term profitability of the PV installation.
Is the dual glass construction of the Suntech Ultra V Pro mini more durable than standard panels?
Yes, the dual glass construction replaces the rear backsheet with a second layer of tempered glass, significantly increasing the module's resistance to microcracks, moisture ingress, and mechanical loads such as hail or snow pressure. Panels built this way better withstand harsh weather conditions and retain their performance over many years of operation.
Are Suntech Ultra V Pro mini panels bifacial?
No, this series uses single-sided (monofacial) cells rather than bifacial technology. This means the module generates energy only from direct sunlight hitting the front side, which is a well-proven and standard solution for typical rooftop installations, where the rear side of the panel has no access to reflected light anyway.
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