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Jetion JT635SIk(B)
Jetion Brand review

JT635SIk(B)

635 Wp HJT Bifacial 85%
ComparePV verdict

Solid all-round for its segment

Rank 2,197 of 14,129
Compare panels Datasheet PDF
Power (Wp)
635
Strong · top 23%
Efficiency (%)
22.40
Typical · median 22.60%
Density (Wp/m²)
224.4
Typical · median 226.0
Temp (%/°C)
-0.240
Typical · median -0.240
Weight (kg)
35.3
Typical · median 33.6 kg
Warranty (yrs)
30
Typical · median 30 yrs

The JT SIk(B) series consists of dual-glass monocrystalline modules built around HJT heterojunction technology, combining a thin-film structure with N-type silicon in high-performance cells. The use of 120 half-cut cells arranged in a multi-busbar layout reduces resistive losses and ensures a more even current distribution across the panel surface. Thanks to its bifacial design, the module also captures light reflected from the ground, delivering additional energy yield in installations over bright surfaces, reflective roofing, or ground-mounted systems. The series also stands out for strong performance under low-light conditions - mornings, evenings, and overcast days - making it an attractive choice for investors seeking stable year-round energy production. A low temperature coefficient limits power losses on hot days, while resistance to LID and PID degradation extends the installation's real-world lifespan. The dual-glass construction increases the panel's mechanical resistance to snow and wind loads and improves durability in harsh weather conditions. This solution is dedicated to both commercial installations and large-scale solar farms, where long-term reliability and predictable return on investment matter most.

Ranking

78 panels in the segment HJT 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 22.40% 22.60% Typical 4,834
Power density 224.4 226.0 Typical 4,794
Temperature coefficient -0.240 -0.240 Typical 13
Weight per kWp 55.6 54.7 Typical 10,065
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

5 positive · 1 caution
Best for

Utility-scale, commercial and shaded-installations.

What owners get
HJT technology with N-type cells

The HJT heterojunction combines N-type silicon with thin-film layers, delivering a low temperature coefficient and strong resistance to LID/PID degradation. The series' 22.3-23% efficiency places it in the premium N-type segment.

Bifacial dual-glass construction

The dual-glass design captures reflected light for additional energy yield, particularly effective in ground-mount installations and on bright/reflective rooftop surfaces.

120 half-cut cells in multi-busbar layout

Half-cut cells combined with multi-busbar interconnection reduce resistive losses and improve partial-shading tolerance, resulting in more stable output under low-irradiance conditions.

Tier-1, BNEF-certified manufacturer

Jetion Solar (founded 2004, affiliated with the CNBM group) is listed on the BloombergNEF Tier 1 Module Maker Tiering System, easing project financing for banks and institutional investors.

Long-term 30-year power warranty

A 15-year product warranty combined with a 30-year linear power warranty supports predictable ROI, important for commercial projects and utility-scale PV farms with long investment horizons.

Trade-offs
Efficiency trails top HJT peers

Maximum efficiency of 23% is lower than comparable same-power modules: Hanersun Hitouch 6N reaches 24.1%, Astronergy ASTRO N5 23.3%, and BYD AURO N NLBK-39 23.25%. The ~1.1pp gap versus the segment leader means lower power density per unit of roof area.

Notes from the database
  • At 22.4% efficiency, this panel is on par with typical HJT 600-650W modules
  • At 224.4 W/m² power density, roof space requirements are typical for HJT 600-650W panels
  • Temperature coefficient of -0.24%/°C matches the HJT 600-650W median
  • At 35.3 kg, this panel is 1.7 kg heavier than the HJT 600-650W median (33.6 kg) - more demanding for installation crews
  • Bifaciality factor of 85% can add 4-13% extra yield with reflective mounting surface

Specifications

Open datasheet PDF
Nominal power (Pmax) 635 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.40 % Typical Segment median 22.60%
Vmpp · Impp 38.15 V · 16.65 A Operating point at max power
Voc · Isc 45.25 V · 17.45 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2172×1303×35 mm · 2.83 m² of roof
Weight 35.3 kg Typical Typical · median 33.6 kg
Cells 120 · HJT Monocrystalline
Bifaciality 85 % Rear output as a share of front
Coefficient Pmax -0.240 %/°C Typical median -0.240 of its segment
Coefficient Voc · Isc -0.240 · 0.040 %/°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 90.3 % Equals 573 W guaranteed
Degradation 1.00 → 0.30 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by Jetion 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.

JT640SIk(B) I-V Curves at Different Irradiance Levels JT640SIk(B) I-V Curves at Different Irradiance Levels Whole series JT640SIk(B) I-V Curves at Different Temperatures JT640SIk(B) I-V Curves at Different Temperatures 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
-0.240 %/°C against a segment median of -0.240
-
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
Jetion JT635SIk(B) 635 W 22.40% -0.240 35.3 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Hotter, lighter, +2.8 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +45 W, lighter, +2.8 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +40 W, lighter, +2.6 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Hotter, lighter, +2.6 pp
WST-675BKX72-A2 675 W 25.00% -0.260 32.1 kg +40 W, lighter, +2.6 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg +35 W, lighter, +2.4 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg +35 W, lighter, +2.4 pp
JT630SIk(B) 630 W 22.30% -0.240 35.3 kg Very close match
JT640SIk(B) 640 W 22.60% -0.240 35.3 kg +0.2 pp
JT645SIk(B) 645 W 22.80% -0.240 35.3 kg +10 W, +0.4 pp
JT650SIk(B) 650 W 23.00% -0.240 35.3 kg +15 W, +0.6 pp
GKA210N120 680 W 24.03% -0.340 28.0 kg Hotter, lighter, +1.6 pp
GKA210N120-675 675 W 23.85% -0.340 28.0 kg Hotter, lighter, +1.5 pp
QN-670HJT-01 670 W 23.70% -0.240 35.5 kg +35 W, +1.3 pp
GKA210N120-670 670 W 23.67% -0.340 28.0 kg Hotter, lighter, +1.3 pp
QN-665HJT-01 665 W 23.50% -0.240 35.5 kg +30 W, +1.1 pp

Found 497 panels of the same or similar size to this one, within ±10 mm. See them here Found 502 panels of the same or similar size to this one, within ±25 mm. See them here Found 502 panels of the same or similar size to this one, within ±50 mm. See them here Found 502 panels of the same or similar size to this one, within ±100 mm. See them here

About the JT SIk(B) series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this module's own.

How does the HJT technology used in the Jetion JT SIk(B) differ from standard PERC panels?
HJT (heterojunction) technology combines N-type monocrystalline silicon with thin amorphous silicon layers, reducing carrier recombination and boosting cell efficiency. Compared to PERC, HJT panels have a lower temperature coefficient, higher resistance to LID and PID degradation, and better performance under low irradiance, resulting in higher annual energy yield.
Are the 650 Wp Jetion JT SIk(B) panels suitable for large ground-mounted installations?
Yes, power output up to 650 Wp combined with bifacial technology makes this series particularly attractive for solar farms and commercial installations. The dual-sided design captures reflected light from bright surfaces, such as gravel or reflective foil, increasing total energy yield by up to several percent compared to monofacial modules.
What is the manufacturer's warranty on Jetion JT SIk(B) panels?
The panels come with a 15-year product warranty covering material and workmanship defects, plus a 30-year power warranty guaranteeing a defined output level throughout that period. This is one of the longest warranty periods currently available on the market, reflecting the manufacturer's confidence in HJT technology durability.
Does the glass-glass construction of Jetion JT SIk(B) panels improve snow load resistance?
Yes, the double-glass (glass-glass) construction significantly increases the module's mechanical rigidity compared to standard glass-backsheet designs. This improves resistance to snow and wind loads while providing better protection against moisture ingress, extending the real-world lifespan of the installation, especially in harsher climates.
Do Jetion JT SIk(B) panels perform well under low-light conditions, such as cloudy days?
Yes, this is one of the key strengths of the HJT technology used in this series. The heterojunction structure captures diffuse and weak sunlight more efficiently than conventional PERC cells, allowing the panels to generate energy in early morning, late afternoon, and cloudy conditions, delivering more consistent production year-round.
Is Jetion a Tier 1 manufacturer and where are the JT SIk(B) panels produced?
Yes, Jetion holds Tier 1 manufacturer status, indicating strong financial stability, long-standing production experience, and warranty reliability confirmed by independent bankability assessments. The JT SIk(B) series is manufactured in China, home to the company's main production facilities using advanced HJT technology lines.
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