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Suntech STP420S-C54/Nshtb+
Suntech Brand review

STP420S-C54/Nshtb+

420 Wp TOPCon Bifacial 80%
ComparePV verdict

Middle of its segment, needs the roof space

Rank 10,622 of 14,129
Compare panels Datasheet PDF
Power (Wp)
420
Weak · bottom 16%
Efficiency (%)
21.51
Weak · bottom 20%
Density (Wp/m²)
215.1
Weak · bottom 18%
Temp (%/°C)
-0.300
Typical · median -0.290
Weight (kg)
21.5
Typical · median 22.0 kg
Warranty (yrs)
30
Typical · median 30 yrs

The Ultra T 1.0 series brings together N-type TOPCon cells and half-cut cell technology, reducing resistive losses and improving performance stability under demanding irradiance conditions. Built as a framed, double-glass bifacial module, it offers strong mechanical rigidity and resistance to snow and wind loads, making it a solid choice for commercial and industrial installations where long-term durability matters most. Thanks to multi busbar technology, the panels make better use of incoming light and collect current more efficiently, boosting the reliability of the entire string. The use of bifacial cells allows the module to capture additional light reflected from the ground, increasing energy yield without expanding the installation footprint - a real advantage wherever roof or ground space is limited. A zero-LID design combined with ultra-low LeTID degradation keeps power loss to a minimum in the early years of operation, while strong PID resistance reduces the risk of losses caused by electrical stress within the module. The Ultra T 1.0 series suits investors looking for a balance between performance, durability, and a lower LCOE across the full lifecycle of the installation.

Ranking

1,220 panels in the segment TOPCon 400-450 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.51% 22.00% Weak · bottom 20% 7,958
Power density 215.1 220.2 Weak · bottom 18% 7,946
Temperature coefficient -0.300 -0.290 Typical 6,152
Weight per kWp 51.2 51.5 Typical 4,591
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 · 2 caution
Best for

Commercial, utility-scale and shaded-installations.

Not ideal for

Roofs where every square metre has to count and tight roof space.

Watch-outs
215.1 watts per square metre

Bottom 18% of the TOPCon 400-450 W segment, against a median of 220.2.

21.51% module efficiency

Bottom 20% of the TOPCon 400-450 W segment, against a median of 22.00%.

Notes from the database
  • At 21.5% efficiency, this panel is on par with typical TOPCon 400-450W modules
  • Power density of 215.1 W/m² is 5.1 W/m² below TOPCon 400-450W median (220.2 W/m²) - needs more roof space
  • At -0.30%/°C, hot weather performance is typical for TOPCon 400-450W panels
  • 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces
  • In the top 56% for efficiency among all TOPCon panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 420 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.51 % Weak Segment median 22.00%
Vmpp · Impp 31.90 V · 13.17 A Operating point at max power
Voc · Isc 38.50 V · 13.83 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 21.5 kg Typical Typical · median 22.0 kg
Cells 108 · TOPCon Monocrystalline
Bifaciality 80 % Rear output as a share of front
Coefficient Pmax -0.300 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.250 · 0.046 %/°C
Product warranty 12 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 367 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 420 Wp appear here. The rest cover the whole series.

Power Degradation over 30 Years Power Degradation over 30 Years 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
-0.300 %/°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 STP420S-C54/Nshtb+ 420 W 21.51% -0.300 21.5 kg You are here
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg +45 W, lighter, +2.3 pp
LX-465M/182R-96+ GG 465 W 23.80% -0.260 23.5 kg +45 W, cooler, +2.3 pp
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg +50 W, +2.2 pp, +10 yr warranty
AIKO-A470-MAH54Mb 470 W 23.60% -0.260 21.5 kg +50 W, cooler, +2.1 pp
AIKO-A460-MAH54Mb 460 W 23.60% -0.290 20.5 kg +40 W, cooler, +2.1 pp
HSM-BD54-LA470 470 W 23.60% -0.260 21.5 kg +50 W, cooler, +2.1 pp
STP390S-C54/Umh 390 W 19.90% -0.360 22.1 kg Hotter, -1.6 pp, -5 yr warranty
STP395S-C54/Umhm 395 W 20.20% -0.340 21.0 kg Hotter, -1.3 pp, -5 yr warranty
STP395S-C54/Umh 395 W 20.20% -0.360 22.1 kg Hotter, -1.3 pp, -5 yr warranty
STP400S-C54/Umhm 400 W 20.50% -0.340 21.0 kg Hotter, -1.0 pp, -5 yr warranty
STP400S-C54/Umh 400 W 20.50% -0.360 22.1 kg Hotter, -1.0 pp, -5 yr warranty
STP405S-C54/Umhm 405 W 20.70% -0.340 21.0 kg Hotter, -0.8 pp, -5 yr warranty
STP405S-C54/Umh 405 W 20.70% -0.360 22.1 kg Hotter, -0.8 pp, -5 yr warranty
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +90 W, cooler, +3.5 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +75 W, cooler, +3.3 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +85 W, cooler, +3.2 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 T 1.0 series

6 answered

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

What makes the Suntech Ultra T 1.0 series different from standard PERC panels?
Ultra T 1.0 uses N-type TOPCon half-cut cells, which are more efficient and less prone to degradation than conventional PERC cells. This results in higher conversion efficiency, better performance at high temperatures and in low-light conditions, and a maximum power output of up to 600 Wp - meaning fewer panels are needed to reach the same system capacity.
Are Suntech Ultra T 1.0 panels bifacial, and how much extra energy can they generate?
Yes, Ultra T 1.0 modules are bifacial in a double-glass construction, meaning the rear side also generates power from reflected light. Depending on the ground surface (light gravel, white EPDM roofing, etc.), this can add anywhere from a few to over ten percent more energy yield without increasing the installation footprint, making it especially cost-effective for ground-mount and flat-roof commercial projects.
What warranty comes with the Suntech Ultra T 1.0 series?
The Ultra T 1.0 series is backed by a 15-year product warranty and a 30-year linear power warranty. This means the module is guaranteed to retain a significant share of its rated output even after three decades of operation, backed by Suntech's status as a tier 1 manufacturer headquartered in China with established service and replacement support.
Does the multi busbar technology in the Ultra T 1.0 actually improve performance?
Yes, a denser busbar grid distributes current more evenly across the cell surface and reduces resistive losses, particularly in cases of micro-cracks or partial shading. In practice, this translates into higher and more consistent energy output over the module's lifetime, not just improved figures under standard STC test conditions.
Are Suntech Ultra T 1.0 panels suitable for industrial and utility-scale solar farms?
Yes, the double-glass framed construction provides high structural rigidity and strong resistance to snow and wind loads, which matters on large industrial rooftops and ground-mount installations. The high per-module power output (up to 600 Wp) combined with bifacial technology also lowers the cost per watt, improving the economics of commercial and utility-scale projects.
Do Ultra T 1.0 panels lose power in their first years of operation due to LID?
Not to a meaningful degree - the N-type TOPCon cells used in the Ultra T 1.0 series feature zero LID effect and very low LeTID degradation, resulting in minimal power loss in the first year. High PID resistance further limits losses from potential-induced degradation, allowing the panel to maintain stable performance over many years of service.
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