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Suntech STP440S-C54/Nshkm+
Suntech Brand review

STP440S-C54/Nshkm+

440 Wp TOPCon
ComparePV verdict

Efficiency leader, no clear weak spot

Rank 8,662 of 14,129
Compare panels Datasheet PDF
Power (Wp)
440
Typical for its class
Efficiency (%)
22.60
Strong · top 4%
Density (Wp/m²)
225.3
Strong · top 8%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
21.0
Strong · 1.0 kg below median
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 22.60% 22.00% Strong · top 4% 3,716
Power density 225.3 220.2 Strong · top 8% 4,158
Temperature coefficient -0.290 -0.290 Typical 2,220
Weight per kWp 47.7 51.5 Strong · top 17% 1,830
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 shaded-installations.

Strengths
22.60% module efficiency

Top 4% of the TOPCon 400-450 W segment, against a median of 22.00%. Ranked 3,716th in the whole database.

225.3 watts per square metre

Top 8% of the TOPCon 400-450 W segment, against a median of 220.2. Ranked 4,158th in the whole database.

47.7 kg per kWp

Top 17% of the TOPCon 400-450 W segment, against a median of 51.5.

Notes from the database
  • 22.6% module efficiency - 0.6pp better than the TOPCon 400-450W median of 22.0%
  • 225.3 W/m² power density - 5.1 W/m² more than TOPCon 400-450W median (220.2 W/m²), more power per roof area
  • Temperature coefficient of -0.29%/°C matches the TOPCon 400-450W median
  • At 21.0 kg, weight matches the TOPCon 400-450W median
  • Ranked #3716 out of 14129 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 440 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.60 % Strong Segment median 22.00%
Vmpp · Impp 32.69 V · 13.46 A Operating point at max power
Voc · Isc 38.98 V · 14.41 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 Strong Strong · 1.0 kg below median
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 385 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 STP440S-C54/Nshkm+ 440 W 22.60% -0.290 21.0 kg You are here
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +50 W, cooler, +1.9 pp
STP-NT11/48QGSF-490 490 W 24.50% -0.260 21.5 kg +50 W, cooler, +1.9 pp
JAT54S40-485/LR 485 W 24.30% -0.260 19.3 kg +45 W, cooler, +1.7 pp
AIKO-A485-MCE54Mw 485 W 24.30% -0.260 21.0 kg +45 W, cooler, +1.7 pp
AIKO-A485-MAH54Mw 485 W 24.30% -0.260 21.5 kg +45 W, cooler, +1.7 pp
GK-5-54HG-485M 485 W 24.30% -0.260 21.0 kg +45 W, cooler, +1.7 pp
ZEUS 3.0+ 108 485WP 485 W 24.30% -0.260 24.2 kg +45 W, heavier, +1.7 pp
STP390S-C54/Umh 390 W 19.90% -0.360 22.1 kg -50 W, hotter, -2.7 pp
STP395S-C54/Umhm 395 W 20.20% -0.340 21.0 kg Hotter, -2.4 pp, -5 yr warranty
STP395S-C54/Umh 395 W 20.20% -0.360 22.1 kg Hotter, -2.4 pp, -5 yr warranty
STP400S-C54/Umhm 400 W 20.50% -0.340 21.0 kg Hotter, -2.1 pp, -5 yr warranty
STP400S-C54/Umh 400 W 20.50% -0.360 22.1 kg Hotter, -2.1 pp, -5 yr warranty
STP405S-C54/Umhm 405 W 20.70% -0.340 21.0 kg Hotter, -1.9 pp, -5 yr warranty
STP405S-C54/Umh 405 W 20.70% -0.360 22.1 kg Hotter, -1.9 pp, -5 yr warranty
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +70 W, cooler, +2.4 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +55 W, cooler, +2.2 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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