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Suntech Brand review

STP590S-C78/Pmhg

590 Wp Monocrystalline Bifacial 70%
ComparePV verdict

Middle of its segment, weak in heat

Rank 6,867 of 14,129
Compare panels Datasheet PDF
Power (Wp)
590
Typical for its class
Efficiency (%)
21.10
Weak · bottom 19%
Density (Wp/m²)
211.2
Weak · bottom 21%
Temp (%/°C)
-0.360
Weak · bottom 3%
Weight (kg)
31.1
Typical · median 31.2 kg
Warranty (yrs)
25
Weak · bottom 11%

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

6,453 panels in the 490-690 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 21.10% 22.25% Weak · bottom 19% 9,365
Power density 211.2 222.5 Weak · bottom 21% 9,336
Temperature coefficient -0.360 -0.300 Weak · bottom 3% 12,425
Weight per kWp 52.7 52.8 Typical 6,411
Performance warranty 25 yrs 30 yrs Weak · bottom 11% 9,912
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

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

Watch-outs
-0.360 %/°C temperature coefficient

Bottom 3% of the 490-690 W band, against a median of -0.300. Ranked 12,425th in the whole database.

25 year performance warranty

Bottom 11% of the 490-690 W band, against a median of 30 yrs.

21.10% module efficiency

Bottom 19% of the 490-690 W band, against a median of 22.25%.

Notes from the database
  • Efficiency of 21.1% is 0.7pp below the database median (21.8%)
  • Power density of 211.2 W/m² is 6.9 W/m² below database median (218.1 W/m²) - needs more roof space
  • Temperature coefficient of -0.36%/°C is 0.06pp worse than database median (-0.30%/°C) - higher losses in summer heat
  • Weight of 31.1 kg is 4.6 kg above database median (26.5 kg) - verify structural support
  • 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 22.25%
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 2464×1134×35 mm · 2.79 m² of roof
Weight 31.1 kg Typical Typical · median 31.2 kg
Cells 156 Monocrystalline
Bifaciality 70 % Rear output as a share of front
Coefficient Pmax -0.360 %/°C Weak bottom 3% 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 11% · median 30 yrs
End-of-warranty output 84.8 % Equals 484 W guaranteed
Degradation 2.00 → 0.55 % 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.

Industry-leading Warranty based on nominal power Industry-leading Warranty based on nominal power Whole series Current-Voltage & Power-Voltage Curve (590S) Current-Voltage & Power-Voltage Curve (590S) 590 W

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
-0.360 %/°C against a segment median of -0.300
-
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/Pmhg 590 W 21.10% -0.360 31.1 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 +50 W, cooler, +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, +3.5 pp, +5 yr warranty
AIKO-A630-MAH72Dw 630 W 24.40% -0.260 32.5 kg Cooler, +3.3 pp, +5 yr warranty
LR7-60HVHL-550M 550 W 24.40% -0.260 16.3 kg Cooler, lighter, +3.3 pp
STP570S-C78/Pmh+ 570 W 20.40% -0.340 35.5 kg Heavier, -0.7 pp, +5 yr warranty
STP570S-C78/Pmhg 570 W 20.40% -0.360 31.1 kg -20 W, -0.7 pp
STP575S-C78/Pmh+ 575 W 20.60% -0.340 35.5 kg Heavier, -0.5 pp, +5 yr warranty
STP575S-C78/Pmhg 575 W 20.60% -0.360 31.1 kg -15 W, -0.5 pp
STP580S-C78/Pmh+ 580 W 20.70% -0.340 35.5 kg Heavier, -0.4 pp, +5 yr warranty
STP580S-C78/Pmhg 580 W 20.80% -0.360 31.1 kg -10 W, -0.3 pp
STP585S-C78/Pmh+ 585 W 20.90% -0.340 35.1 kg Cooler, heavier, +5 yr warranty
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

Found 616 panels of the same or similar size to this one, within ±10 mm. See them here Found 616 panels of the same or similar size to this one, within ±25 mm. See them here Found 616 panels of the same or similar size to this one, within ±50 mm. See them here Found 1838 panels of the same or similar size to this one, within ±100 mm. See them here

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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