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Suntech Brand review

STP390S-C54/Umh

390 Wp Monocrystalline
ComparePV verdict

Middle of its segment, weak in heat

Rank 12,547 of 14,129
Compare panels Datasheet PDF
Power (Wp)
390
Weak · bottom 20%
Efficiency (%)
19.90
Weak · bottom 19%
Density (Wp/m²)
199.5
Weak · bottom 20%
Temp (%/°C)
-0.360
Weak · bottom 12%
Weight (kg)
22.1
Typical · median 22.3 kg
Warranty (yrs)
25
Weak · bottom 19%

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

6,261 panels in the 290-490 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 19.90% 21.25% Weak · bottom 19% 12,416
Power density 199.5 212.5 Weak · bottom 20% 12,376
Temperature coefficient -0.360 -0.300 Weak · bottom 12% 12,425
Weight per kWp 56.7 53.3 Typical 10,887
Performance warranty 25 yrs 30 yrs Weak · bottom 19% 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

Hot climates, tight roof space and owners who want a long output guarantee.

Watch-outs
-0.360 %/°C temperature coefficient

Bottom 12% of the 290-490 W band, against a median of -0.300.

19.90% module efficiency

Bottom 19% of the 290-490 W band, against a median of 21.25%.

25 year performance warranty

Bottom 19% of the 290-490 W band, against a median of 30 yrs.

Notes from the database
  • At 19.9% efficiency, this panel is 1.9pp below the database median of 21.8%
  • Power density of 199.5 W/m² is 18.6 W/m² below database median (218.1 W/m²) - needs more roof space
  • At -0.36%/°C, loses 0.06pp more power per degree than database median (-0.30%/°C)
  • Weight of 22.1 kg (4.4 kg below database median of 26.5 kg) allows easier transport and roof mounting
  • In the top 88% for efficiency among all N-type panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 390 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 19.90 % Weak Segment median 21.25%
Vmpp · Impp 30.76 V · 12.69 A Operating point at max power
Voc · Isc 36.62 V · 13.59 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1724×1134×30 mm · 1.96 m² of roof
Weight 22.1 kg Typical Typical · median 22.3 kg
Cells 108 Monocrystalline
Coefficient Pmax -0.360 %/°C Weak bottom 12% of its segment
Coefficient Voc · Isc -0.304 · 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 19% · median 30 yrs
End-of-warranty output 84.8 % Equals 320 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
-0.360 %/°C against a segment median of -0.300
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Suntech STP390S-C54/Umh 390 W 19.90% -0.360 22.1 kg You are here
LX-440M/182-108+GG 440 W 23.07% -0.240 23.6 kg +50 W, cooler, +3.2 pp
GKA210M340W 340 W 23.00% - 16.2 kg -50 W, lighter, +3.1 pp
GKA210M360W 360 W 23.00% - 16.2 kg Lighter, +3.1 pp, +5 yr warranty
GKA210M380W (1/4*4*38) 380 W 23.00% - 17.1 kg Lighter, +3.1 pp, +5 yr warranty
GKA210M400W (1/2*4*20) 400 W 23.00% - 18.0 kg Lighter, +3.1 pp, +5 yr warranty
GKA210M400W (1/4*4*40) 400 W 23.00% - 18.0 kg Lighter, +3.1 pp, +5 yr warranty
GKA210M380W (1/2*4*19) 380 W 23.00% - 17.1 kg Lighter, +3.1 pp, +5 yr warranty
JT440SYK(B) 440 W 22.90% -0.240 23.0 kg +50 W, cooler, +3.0 pp
STP395S-C54/Umhm 395 W 20.20% -0.340 21.0 kg Cooler, lighter, +0.3 pp
STP395S-C54/Umh 395 W 20.20% -0.360 22.1 kg +0.3 pp
STP400S-C54/Umhm 400 W 20.50% -0.340 21.0 kg Cooler, lighter, +0.6 pp
STP400S-C54/Umh 400 W 20.50% -0.360 22.1 kg +10 W, +0.6 pp
STP405S-C54/Umhm 405 W 20.70% -0.340 21.0 kg +15 W, cooler, +0.8 pp
STP405S-C54/Umh 405 W 20.70% -0.360 22.1 kg +15 W, +0.8 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +120 W, cooler, +5.1 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +105 W, cooler, +4.9 pp

Found 1797 panels of the same or similar size to this one, within ±10 mm. See them here Found 1931 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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