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Ulica Solar Brand review

UL-660M-132DG

660 Wp TOPCon Bifacial
ComparePV verdict

Middle of its segment, needs the roof space

Rank 3,163 of 14,005
Compare panels Datasheet PDF
Power (Wp)
660
Typical for its class
Efficiency (%)
21.25
Weak · bottom 6%
Density (Wp/m²)
212.5
Weak · bottom 5%
Temp (%/°C)
-0.340
Weak · bottom 6%
Weight (kg)
37.3
Weak · 2.7 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The Ulica Solar Double-glass bifacial UL-655|660|665|670M-132DG series comprises modules that combine a glass-glass structure with bifacial operation, allowing them to better utilize reflected light from the ground and operate more reliably in challenging mounting conditions. The use of monocrystalline PERC cells supports high efficiency under real-world conditions, while the rigid construction with tempered glass on both sides increases resistance to microcracks and accelerated degradation, which is important for long-term investments. These modules offer a long-term power warranty and a positive tolerance margin, making it easier to design installations without the risk of "underestimated" parameters. They are a good choice for PV farms, commercial rooftop and carport installations, and projects where durability, consistent quality, and predictable energy production are important. Compared to many competing panels, they stand out due to their combination of bifaciality and the glass-glass structure, which provides better protection for the module over time.

Ranking

249 panels in the segment TOPCon 650-700 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.25% 22.40% Weak · bottom 6% 8,904
Power density 212.5 223.7 Weak · bottom 5% 8,959
Temperature coefficient -0.340 -0.290 Weak · bottom 6% 8,778
Weight per kWp 56.5 53.2 Weak · bottom 15% 10,694
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 and utility-scale.

Not ideal for

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

Watch-outs
212.5 watts per square metre

Bottom 5% of the TOPCon 650-700 W segment, against a median of 223.7. Ranked 8,959th in the whole database.

-0.340 %/°C temperature coefficient

Bottom 6% of the TOPCon 650-700 W segment, against a median of -0.290. Ranked 8,778th in the whole database.

21.25% module efficiency

Bottom 6% of the TOPCon 650-700 W segment, against a median of 22.40%. Ranked 8,904th in the whole database.

Notes from the database
  • At 21.2% efficiency, this panel is 1.1pp below the TOPCon 650-700W median of 22.4%
  • Power density of 212.5 W/m² is 11.2 W/m² below TOPCon 650-700W median (223.7 W/m²) - needs more roof space
  • At -0.34%/°C, loses 0.05pp more power per degree than TOPCon 650-700W median (-0.29%/°C)
  • At 37.3 kg, this panel is 2.7 kg heavier than the TOPCon 650-700W median (34.6 kg) - more demanding for installation crews
  • In the top 64% for efficiency among all TOPCon panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 660 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.25 % Weak Segment median 22.40%
Vmpp · Impp 38.20 V · 17.28 A Operating point at max power
Voc · Isc 45.70 V · 18.44 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2384×1303×35 mm · 3.11 m² of roof
Weight 37.3 kg Weak Weak · 2.7 kg above median
Cells 132 · TOPCon Monocrystalline
Coefficient Pmax -0.340 %/°C Weak bottom 6% of its segment
Coefficient Voc · Isc -0.265 · 0.049 %/°C
NOCT 43 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 85.0 % Equals 577 W guaranteed
Degradation 1.00 → 0.40 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by Ulica Solar in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 660 Wp appear here. The rest cover the whole series.

I-V characteristics at different irradiations I-V characteristics at different irradiations Whole series I-V characteristics at different temperature I-V characteristics at different temperature 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
-

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
Ulica Solar UL-660M-132DG 660 W 21.25% -0.340 37.3 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +3.9 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg Cooler, lighter, +3.9 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg Cooler, lighter, +3.8 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +3.8 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +40 W, cooler, +3.8 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +35 W, cooler, +3.6 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Cooler, lighter, +3.6 pp
UL-655M-132DG 655 W 21.09% -0.340 37.3 kg Very close match
UL-665M-132HV 665 W 21.41% -0.340 33.3 kg Lighter, -5 yr warranty
UL-670M-132DG 670 W 21.57% -0.340 37.3 kg +10 W, +0.3 pp
UL-700M-132DGN 700 W 22.53% -0.290 37.4 kg +40 W, cooler, +1.3 pp
UL-705M-132DGN 705 W 22.70% -0.290 37.4 kg +45 W, cooler, +1.4 pp
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +145 W, cooler, +3.9 pp
AIKO-A800-GRH78Dw 800 W 24.90% -0.260 39.8 kg +140 W, cooler, +3.6 pp
AIKO-A795-GRH78Dw 795 W 24.80% -0.260 39.8 kg +135 W, cooler, +3.6 pp
AIKO-A790-GRH78Dw 790 W 24.60% -0.260 39.8 kg +130 W, cooler, +3.4 pp

Found 1390 panels of the same or similar size to this one, within ±10 mm. See them here Found 1400 panels of the same or similar size to this one, within ±25 mm. See them here Found 1400 panels of the same or similar size to this one, within ±50 mm. See them here Found 1432 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What is bifacial technology in the Ulica Solar UL-655|660|665|670M-132DG panels and is it actually worth it?
Bifacial technology means the module generates power from both sides - front and rear. It captures extra reflected light from the ground, roof, or a light-colored surface beneath the array, which, with the right installation (e.g., over light gravel or reflective membrane), delivers a real energy yield gain, typically a few to over ten percent more than a monofacial module. The biggest benefits show up on PV farms and flat roofs with sufficient mounting clearance.
What warranty comes with the Ulica Solar UL-655-670M-132DG modules?
The series carries a 12-year product warranty covering material and workmanship defects, plus a 30-year linear power warranty with a positive power tolerance. This means that even after 30 years the module still has a guaranteed, predictable percentage of its initial power output, which supports bankable design for commercial installations and PV farms without the risk of underperforming energy yield projections.
Does the glass-glass construction actually improve durability compared to standard modules with a rear backsheet?
Yes. Tempered glass on both sides of the cells instead of a polymer backsheet provides much better protection against moisture ingress, microcracks, and accelerated PID degradation, especially under large temperature and humidity swings. This construction is also mechanically stiffer, which matters for installations exposed to wind, hail, or snow loads and for projects designed for stable, long-term operation.
What installations are the Ulica Solar UL-655-670M-132DG panels best suited for - ground-mount farms, commercial roofs, or carports?
This series is primarily designed for large-scale installations: ground-mounted PV farms, commercial and industrial rooftops, and carport structures, where bifacial operation and power output up to 670 Wp deliver a better power-to-area ratio. The large module format makes it less typical for small residential installations on sloped rooftops.
What is the maximum power output of this series and which cells does it use?
The UL-655|660|665|670M-132DG series delivers up to 670 Wp, depending on the specific variant (655, 660, 665, or 670 Wp). It uses 132 monocrystalline PERC cells in a half-cut layout, which reduces resistive losses and improves module efficiency while also increasing resistance to partial shading, for example from soiling or mounting structure elements.
Is the Ulica Solar UL-655|660|665|670M-132DG series still available for purchase?
No, production of this series has ended and the model is considered discontinued from the manufacturer's current lineup. Panels may still be available only from distributor stock while supplies last. When planning a new installation or expanding an existing PV farm built with these modules, it's worth checking stock availability in advance or considering a current equivalent from Ulica Solar's active product range.
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