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Ulica Solar Brand review

UL-635M-144CDGN

635 Wp N-type Bifacial
ComparePV verdict

Efficiency leader, no clear weak spot

Rank 1,437 of 14,005
Compare panels Datasheet PDF
Power (Wp)
635
Strong · top 22%
Efficiency (%)
23.51
Strong · top 10%
Density (Wp/m²)
235.1
Strong · top 12%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
32.0
Typical · median 32.5 kg
Warranty (yrs)
30
Typical · median 30 yrs

The Ulica Solar QIN series (double-glass bifacial, N-type) is designed to maximize energy yield in installations where every square meter counts. A key advantage is the glass-glass construction, which improves resistance to environmental factors and stabilizes operating parameters over the long term. Thanks to bifacial operation, the modules can effectively utilize reflected light from the ground, which effectively increases power generation in PV farms, carport structures, and flat roofs with reflective membranes.

The QIN series utilizes N-type TOPCon technology, optimized for lower degradation and better performance in demanding conditions. In addition, connection and metallization solutions minimize losses and shading of the active surface, resulting in higher power density for the same module area and a more favorable energy cost over the lifespan. This is a proposal for investors and contractors who expect high reliability and predictable yields in commercial and large-scale projects.

Ranking

359 panels in the segment N-type 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.51% 22.77% Strong · top 10% 696
Power density 235.1 227.7 Strong · top 12% 741
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 50.4 52.7 Typical 3,778
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

2 positive · 0 caution
Best for

Commercial and utility-scale.

Strengths
23.51% module efficiency

Top 10% of the N-type 600-650 W segment, against a median of 22.77%. Ranked 696th in the whole database.

235.1 watts per square metre

Top 12% of the N-type 600-650 W segment, against a median of 227.7.

Notes from the database
  • At 23.5% efficiency, this panel is 0.7pp above typical N-type 600-650W modules (median: 22.8%)
  • 235.1 W/m² power density - 7.4 W/m² more than N-type 600-650W median (227.7 W/m²), more power per roof area
  • Temperature coefficient of -0.29%/°C matches the N-type 600-650W median
  • #696 for efficiency, #2165 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 635 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.51 % Strong Segment median 22.77%
Vmpp · Impp 44.48 V · 14.28 A Operating point at max power
Voc · Isc 52.59 V · 15.18 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2382×1134×30 mm · 2.70 m² of roof
Weight 32.0 kg Typical Typical · median 32.5 kg
Cells 144 · N-type Monocrystalline
Coefficient Pmax -0.290 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.250 · 0.045 %/°C
NOCT 43 °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 87.4 % Equals 555 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 635 Wp appear here. The rest cover the whole series.

PERC vs TOPCon Bifacial Module 30-Year Linear Power Output Warranty PERC vs TOPCon Bifacial Module 30-Year Linear Power Output Warranty Whole series I-V characteristics at different irradiations (reference to 635 W) I-V characteristics at different irradiations (reference to 635 W) 635 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
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.290 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Ulica Solar UL-635M-144CDGN 635 W 23.51% -0.290 32.0 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +1.7 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +45 W, lighter, +1.7 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +40 W, lighter, +1.5 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +1.5 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg +35 W, lighter, +1.3 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg +35 W, lighter, +1.3 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg Cooler, lighter, +1.3 pp
UL-600M-156ADGN 600 W 22.21% -0.290 32.0 kg -35 W, -1.3 pp
UL-605M-156ADGN 605 W 22.40% -0.290 32.0 kg -30 W, -1.1 pp
UL-610M-156ADGN 610 W 22.58% -0.290 32.0 kg -25 W, -0.9 pp
UL-615M-156ADGN 615 W 22.75% -0.290 32.0 kg -20 W, -0.8 pp
UL-630M-144CDGN 630 W 23.32% -0.290 32.0 kg Very close match
UL-640M-144CDGN 640 W 23.69% -0.290 32.0 kg Very close match
UL-645M-144CDGN 645 W 23.88% -0.290 32.0 kg +10 W, +0.4 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +65 W, cooler, +1.5 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +60 W, cooler, +1.4 pp

Found 1119 panels of the same or similar size to this one, within ±10 mm. See them here Found 1125 panels of the same or similar size to this one, within ±25 mm. See them here Found 1236 panels of the same or similar size to this one, within ±50 mm. See them here Found 1917 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What is the maximum power output of the Ulica Solar QIN series panels, and how many modules are needed for a typical 10 kW installation?
QIN series panels reach up to 645 Wp, placing them among the highest-power bifacial N-type modules currently available. Thanks to this high unit power, a 10 kW installation requires only about 16 modules, compared to 20-25 with older 400-450 Wp panels. This translates into fewer mounting clamps, shorter installation time, and lower racking cost per kW installed.
What is the N-type TOPCon cell technology used in QIN panels, and how does it differ from standard PERC cells?
TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell technology in which a thin oxide layer passivates the electrical contacts, reducing recombination losses. Compared to widely used PERC (P-type) cells, N-type cells show lower annual degradation and perform better at high temperatures and low irradiance. In practice, this means higher and more stable energy yield over the installation's lifetime.
Is it worth paying extra for bifacial panels in the QIN series, or is a standard mono-facial panel a better choice?
QIN bifacial panels generate additional energy from the rear side of the module by capturing light reflected off the ground. The premium makes sense mainly for PV farms with bright ground cover or gravel, carports, and flat roofs with a light-colored membrane, where the extra yield can reach several to over ten percent. On a typical pitched roof with dark tiles, the bifacial gain will be much smaller, so it's worth consulting a system designer on the economics.
What warranty does Ulica Solar offer on the QIN series - on the product and on power output?
The QIN series comes with a 15-year product warranty covering material and workmanship defects, plus a 30-year linear power output warranty. This means the manufacturer guarantees a specified minimum percentage of initial power even after three decades of operation, which is standard for modern N-type panels and helps investors plan returns on commercial-scale projects.
Does the double-glass construction of QIN panels make installation harder due to extra weight?
Double-glass panels are typically somewhat heavier than standard glass-backsheet modules, but the difference rarely has a major impact on installation, since most racking systems for commercial and utility-scale projects are designed to accommodate this load. In return, the module gains better resistance to moisture ingress, microcracks, and PID degradation, which pays off especially in projects designed for 25-30 years of operation, such as PV farms or industrial roofs.
Is Ulica Solar a Tier 1 manufacturer, and does that matter when choosing QIN panels?
Ulica Solar, headquartered in China, is not currently on the BloombergNEF Tier 1 list, which primarily reflects the scale of bank financing rather than product quality itself. QIN panels use proven N-type TOPCon technology and double-glass construction, also common among Tier 1 manufacturers. When choosing panels, it's worth checking certifications (IEC, TÜV), warranty terms, and references from completed projects rather than relying on Tier 1 status alone.
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