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Suntech Brand review

STP405S-C54/Umhm

405 Wp TOPCon
ComparePV verdict

Middle of its segment, modest efficiency

Rank 12,009 of 14,129
Compare panels Datasheet PDF
Power (Wp)
405
Weak · bottom 2%
Efficiency (%)
20.70
Weak · bottom 3%
Density (Wp/m²)
207.4
Weak · bottom 3%
Temp (%/°C)
-0.340
Weak · bottom 5%
Weight (kg)
21.0
Typical · median 22.0 kg
Warranty (yrs)
25
Weak · bottom 7%

Suntech Ultra V mini modules are designed to offer maximum power density for every square meter of available roof area. Through the use of modern cells based on M10 silicon wafers and Multi-Busbar technology, these panels effectively minimize resistive losses and increase sunlight absorption. This solution ideally addresses the needs of homeowners with limited installation space, where every centimeter of the roof is critical to the final profitability of the investment. The exceptionally low weight of the modules facilitates logistics and installation without placing an excessive load on the roof structure, which is particularly important when modernizing older buildings. The innovative Half-Cut cell structure guarantees stable system performance even during periodic shading, clearly setting this series apart from standard solutions currently available on the market. Suntech Ultra V mini also offers increased resistance to PID degradation and excellent temperature coefficients, ensuring high electricity production even on hot days. By choosing these panels, Polish investors receive a product that combines elegant design with premium-class technology, fully optimized for a rapid return on investment.

Ranking

1,220 panels in the segment TOPCon 400-450 W
Metric This panel Median Position in segment Overall rank
Module efficiency 20.70% 22.00% Weak · bottom 3% 10,842
Power density 207.4 220.2 Weak · bottom 3% 10,702
Temperature coefficient -0.340 -0.290 Weak · bottom 5% 8,846
Weight per kWp 51.9 51.5 Typical 5,262
Performance warranty 25 yrs 30 yrs Weak · bottom 7% 9,912
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 3 caution
Best for

Residential and shaded-installations.

Not ideal for

Tight roof space, roofs where every square metre has to count and hot climates.

Watch-outs
20.70% module efficiency

Bottom 3% of the TOPCon 400-450 W segment, against a median of 22.00%. Ranked 10,842nd in the whole database.

207.4 watts per square metre

Bottom 3% of the TOPCon 400-450 W segment, against a median of 220.2. Ranked 10,702nd in the whole database.

-0.340 %/°C temperature coefficient

Bottom 5% of the TOPCon 400-450 W segment, against a median of -0.290. Ranked 8,846th in the whole database.

Notes from the database
  • Efficiency of 20.7% is 1.3pp below the TOPCon 400-450W median (22.0%)
  • At 207.4 W/m², this panel generates 12.8 W/m² less per unit area than TOPCon 400-450W median (220.2 W/m²)
  • Temperature coefficient of -0.34%/°C is 0.05pp worse than TOPCon 400-450W median (-0.29%/°C) - higher losses in summer heat
  • Weight of 21.0 kg is typical for TOPCon 400-450W panels
  • In the top 77% for efficiency among all TOPCon panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 405 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 20.70 % Weak Segment median 22.00%
Vmpp · Impp 31.38 V · 12.91 A Operating point at max power
Voc · Isc 37.24 V · 13.81 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 -0.340 %/°C Weak bottom 5% of its segment
Coefficient Voc · Isc -0.260 · 0.050 %/°C
NOCT 42 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 25 years Weak bottom 7% · median 30 yrs
End-of-warranty output 84.8 % Equals 332 W guaranteed
Degradation 2.00 → 0.55 % 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
-0.340 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Suntech STP405S-C54/Umhm 405 W 20.70% -0.340 21.0 kg You are here
AIKO-455-MAH54Db 455 W 23.30% -0.260 24.0 kg +50 W, cooler, +2.6 pp
LR5-54HTH-455M 455 W 23.30% -0.290 20.8 kg +50 W, cooler, +2.6 pp
YL455CF54 e/2 455 W 23.30% -0.290 20.3 kg +50 W, cooler, +2.6 pp
ESM-455T 455 W 23.30% -0.310 21.0 kg +50 W, +2.6 pp, +5 yr warranty
SE5-54HBC-455W 455 W 23.30% -0.290 20.8 kg +50 W, cooler, +2.6 pp
JST-EDMH-(445-465)W-TD (455W class) 455 W 23.30% -0.300 20.5 kg +50 W, +2.6 pp, +5 yr warranty
LX-455M/182R-96+ GG 455 W 23.30% -0.260 23.5 kg +50 W, cooler, +2.6 pp
STP390S-C54/Umh 390 W 19.90% -0.360 22.1 kg -15 W, hotter, -0.8 pp
STP395S-C54/Umhm 395 W 20.20% -0.340 21.0 kg -10 W, -0.5 pp
STP395S-C54/Umh 395 W 20.20% -0.360 22.1 kg Hotter, heavier, -0.5 pp
STP400S-C54/Umhm 400 W 20.50% -0.340 21.0 kg Very close match
STP400S-C54/Umh 400 W 20.50% -0.360 22.1 kg Hotter, heavier
STP405S-C54/Umh 405 W 20.70% -0.360 22.1 kg Hotter, heavier
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +105 W, cooler, +4.3 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +90 W, cooler, +4.1 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +100 W, cooler, +4.0 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 mini series

6 answered

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

Is the Suntech Ultra V mini series still available for purchase?
The Ultra V mini series has been discontinued by the manufacturer and replaced with newer product lines. This means availability is now limited to remaining distributor stock. It's worth checking current inventory with your supplier before planning a larger installation, since additional panels may not be available later to expand an existing system.
What is the maximum power of the Suntech Ultra V mini module and how many panels are needed for a typical system?
The module reaches a maximum power of 415 Wp thanks to TOPCon cells and half-cut technology. For a typical 5 kWp installation, roughly 12 panels are needed. Thanks to its high power density per square meter, this module fits more kilowatts on limited roof space than older PERC-based designs.
What warranty comes with the Suntech Ultra V mini panels?
The manufacturer provides a 12-year product warranty along with a 25-year power performance warranty. As a Tier 1 manufacturer based in China, Suntech offers service support in line with international industry standards, though the series' discontinuation is worth considering when planning future replacement of individual panels.
What is TOPCon technology in the Ultra V mini panels, and is it better than PERC?
TOPCon is an n-type cell technology that reduces recombination losses and delivers higher conversion efficiency than older PERC cells. In practice, this means higher energy output from the same panel area and better temperature performance, resulting in higher energy yields on hot days compared to conventional p-type modules.
Are the Suntech Ultra V mini panels suitable for small pitched roofs?
Yes, the Ultra V mini series was specifically designed for limited roof space. Compact dimensions combined with a high 415 Wp output help maximize energy production even on small roof sections. The module's low weight makes transport and installation on typical pitched roof structures easier, without overloading the roof truss.
Is the Suntech Ultra V mini a bifacial panel?
No, this specific version of the Ultra V mini series is a monofacial module, meaning it does not capture reflected light on its rear side. Suntech offers a separate Ultra V Pro mini version with bifacial technology, but this series focuses on maximizing front-side power output while keeping a lower weight and simpler construction.
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