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Suntech Brand review

STP590S-C78/Pmh+

590 Wp TOPCon Bifacial 70%
ComparePV verdict

Middle of its segment, modest efficiency

Rank 5,207 of 14,129
Compare panels Datasheet PDF
Power (Wp)
590
Strong · top 18%
Efficiency (%)
21.10
Weak · bottom 3%
Density (Wp/m²)
211.1
Weak · bottom 3%
Temp (%/°C)
-0.340
Weak · bottom 5%
Weight (kg)
35.1
Weak · 3.9 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

Ultra V Plus is a series of bifacial dual-sided modules designed for investors who want to maximize energy yield from every square meter of roof or ground-mounted installation space. The panel uses monocrystalline half-cut cells arranged in a 6x26 layout, which reduces power losses from partial shading and improves reliability under demanding irradiance conditions. Thanks to multi-busbar technology and Suntech's proprietary current-sorting process, the module effectively eliminates electrical mismatch between cells, translating into a real increase in energy output from the system. The rear-side design allows for additional energy capture from light reflected off the ground, making the series particularly attractive for installations on bright surfaces, flat roofs, or ground-mount systems. The panels stand out with a low power temperature coefficient, losing less performance on hot days compared to competing solutions, along with strong output in low-light conditions such as mornings or overcast weather. The module has passed extended wind and snow load testing, confirming its durability in demanding climate conditions. The series is backed by a 30-year linear warranty and low annual power degradation, making it a solid choice for both residential installations and large-scale commercial solar farm projects.

Ranking

1,022 panels in the segment TOPCon 550-600 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.10% 22.44% Weak · bottom 3% 9,365
Power density 211.1 224.4 Weak · bottom 3% 9,360
Temperature coefficient -0.340 -0.290 Weak · bottom 5% 8,846
Weight per kWp 59.5 53.8 Weak · bottom 4% 12,257
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 · 3 caution
Best for

Commercial, utility-scale and shaded-installations.

Not ideal for

Tight roof space, roofs where every square metre has to count and weight-limited structures.

Watch-outs
21.10% module efficiency

Bottom 3% of the TOPCon 550-600 W segment, against a median of 22.44%. Ranked 9,365th in the whole database.

211.1 watts per square metre

Bottom 3% of the TOPCon 550-600 W segment, against a median of 224.4. Ranked 9,360th in the whole database.

59.5 kg per kWp

Bottom 4% of the TOPCon 550-600 W segment, against a median of 53.8. Ranked 12,257th in the whole database.

Notes from the database
  • Efficiency of 21.1% is 1.3pp below the TOPCon 550-600W median (22.4%)
  • Power density of 211.1 W/m² is 13.3 W/m² below TOPCon 550-600W median (224.4 W/m²) - needs more roof space
  • At -0.34%/°C, loses 0.05pp more power per degree than TOPCon 550-600W median (-0.29%/°C)
  • At 35.1 kg, this panel is 3.9 kg heavier than the TOPCon 550-600W median (31.2 kg) - more demanding for installation crews
  • 70% bifaciality enables rear-side power generation, boosting yield by 4-10% on reflective surfaces

Specifications

Open datasheet PDF
Nominal power (Pmax) 590 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.10 % Weak Segment median 22.44%
Vmpp · Impp 45.36 V · 13.01 A Operating point at max power
Voc · Isc 53.79 V · 13.91 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2465×1134×35 mm · 2.80 m² of roof
Weight 35.1 kg Weak Weak · 3.9 kg above median
Cells 156 · TOPCon Monocrystalline
Bifaciality 70 % Rear output as a share of front
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 15 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 85.0 % Equals 501 W guaranteed
Degradation 2.00 → 0.45 % 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 590 Wp appear here. The rest cover the whole series.

Current-Voltage and Power-Voltage Curves Current-Voltage and Power-Voltage Curves 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
-0.340 %/°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 STP590S-C78/Pmh+ 590 W 21.10% -0.340 35.1 kg You are here
LR7-60HVH-560M 560 W 24.80% -0.260 25.0 kg Cooler, lighter, +3.7 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg Cooler, lighter, +3.7 pp
LR7-60HVH-555M 555 W 24.60% -0.260 25.0 kg Cooler, lighter, +3.5 pp
AIKO-A635-MAE72Mw 635 W 24.60% -0.260 27.0 kg Cooler, lighter, +3.5 pp
AIKO-A630-MAH72Dw 630 W 24.40% -0.260 32.5 kg +40 W, cooler, +3.3 pp
LR7-60HVHL-550M 550 W 24.40% -0.260 16.3 kg Cooler, 19 kg lighter, +3.3 pp
STP570S-C78/Pmh+ 570 W 20.40% -0.340 35.5 kg -20 W, -0.7 pp
STP570S-C78/Pmhg 570 W 20.40% -0.360 31.1 kg Lighter, -0.7 pp, -5 yr warranty
STP575S-C78/Pmh+ 575 W 20.60% -0.340 35.5 kg -15 W, -0.5 pp
STP575S-C78/Pmhg 575 W 20.60% -0.360 31.1 kg Lighter, -0.5 pp, -5 yr warranty
STP580S-C78/Pmh+ 580 W 20.70% -0.340 35.5 kg -10 W, -0.4 pp
STP580S-C78/Pmhg 580 W 20.80% -0.360 31.1 kg Hotter, lighter, -5 yr warranty
STP585S-C78/Pmh+ 585 W 20.90% -0.340 35.1 kg -0.2 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +90 W, cooler, +4.1 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +85 W, cooler, +3.9 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +110 W, cooler, +3.9 pp

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About the Ultra V Plus 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 Plus panel?
Modules in the Ultra V Plus series reach a maximum power of up to 605 Wp. This high output comes from monocrystalline half-cut TOPCon cells, which deliver higher conversion efficiency than older PERC-based designs while keeping module dimensions comparable to standard panels.
What warranty does Suntech offer on the Ultra V Plus series?
The manufacturer provides a 15-year product warranty and a 30-year linear power warranty. This means that after 30 years of operation the module is guaranteed to still deliver a minimum specified power output, which is standard for modern TOPCon-based panels.
Is the Suntech Ultra V Plus a bifacial (dual-sided) panel?
No, this version of the Ultra V Plus is a monofacial module. It uses TOPCon technology with half-cut cells, but energy is generated only from the front side, unlike the bifacial variants in Suntech's Ultra V Pro lineup, where the rear side also contributes to power output.
What is TOPCon technology and how does it differ from PERC?
TOPCon (Tunnel Oxide Passivated Contact) is an n-type cell technology with an additional passivation layer that reduces carrier recombination and increases conversion efficiency compared to older p-type PERC cells. In practice this results in higher module power, a lower temperature coefficient, and slower annual power degradation over time.
Is the Suntech Ultra V Plus suitable for large commercial and utility-scale solar farms?
Yes, the high unit power of up to 605 Wp combined with a large cell format makes the series well suited to commercial rooftop installations as well as ground-mount systems and utility-scale solar farms, where maximizing energy yield per unit of land area matters most.
Is Suntech a Tier 1 manufacturer, and is it worth buying panels from a Chinese producer?
Suntech is classified as a Tier 1 manufacturer, indicating financial stability, in-house production lines, and a long-standing presence in the global market. The company is headquartered in China, but its modules are certified to European (IEC) standards and widely deployed across Poland and other EU markets, supporting warranty service availability.
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