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Jetion Brand review

JT420SEt(L)

420 Wp TOPCon
ComparePV verdict

Light for its output, short guarantee

Rank 11,649 of 14,129
Compare panels Datasheet PDF
Power (Wp)
420
Weak · bottom 16%
Efficiency (%)
21.50
Weak · bottom 17%
Density (Wp/m²)
215.4
Typical · median 220.2
Temp (%/°C)
-0.300
Typical · median -0.290
Weight (kg)
13.1
Strong · 8.9 kg below median
Warranty (yrs)
20
Weak · bottom 1%

The JT SEt(L) series from Jetion Solar comprises photovoltaic modules built around TOPCon technology, using N-type monocrystalline cells known for stable long-term parameters. The panels feature half-cut cells arranged in a multi-busbar layout, which reduces resistive losses and improves resistance to microcracks and partial shading. Thanks to its compact module dimensions, the JT SEt(L) series is particularly well suited to rooftop installations on single-family homes, where efficient use of available roof space and a clean aesthetic matter just as much as output. A low power temperature coefficient translates into more stable energy production on hot days, which is relevant in the Polish climate with increasingly frequent heatwaves. N-type TOPCon technology delivers lower annual degradation compared to conventional PERC cells, resulting in higher energy yield over the system's entire service life. The manufacturer backs the series with a long-term product and power warranty, giving investors confidence in the durability of their investment. JT SEt(L) is a solid choice for installers and investors looking for a modern solution that combines high build quality, strong performance in elevated temperatures, and a uniform, aesthetic installation appearance.

Ranking

1,220 panels in the segment TOPCon 400-450 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.50% 22.00% Weak · bottom 17% 8,022
Power density 215.4 220.2 Typical 7,847
Temperature coefficient -0.300 -0.290 Typical 6,152
Weight per kWp 31.2 51.5 Strong · top 1% 151
Performance warranty 20 yrs 30 yrs Weak · bottom 1% 13,920
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

6 positive · 4 caution
Best for

Residential, commercial and BIPV.

Not ideal for

Owners who want a long output guarantee and tight roof space.

Strengths
31.2 kg per kWp

Top 1% of the TOPCon 400-450 W segment, against a median of 51.5. Ranked 151st in the whole database.

Watch-outs
20 year performance warranty

Bottom 1% of the TOPCon 400-450 W segment, against a median of 30 yrs. Ranked 13,920th in the whole database.

21.50% module efficiency

Bottom 17% of the TOPCon 400-450 W segment, against a median of 22.00%.

What owners get
Efficiency on par with segment leaders

Efficiency up to 22.3% places the JT SEt(L) series in the same league as the best comparable TOPCon modules (SunLink SL5N108 - 22.3%, SunKean SKT415~435M10 - 22.27%), matching the same maximum power of 435 Wp.

N-type TOPCon cells with half-cut design

Half-cut cells arranged in a multi-busbar layout reduce resistive losses and increase resistance to microcracks and partial shading, while N-type TOPCon technology delivers lower LID/LETID degradation compared to conventional PERC cells.

Tier-1 BNEF manufacturer, operating since 2004

Jetion Solar holds Tier-1 status under the BloombergNEF Module Maker Tiering System, indicating recognized bankability for non-recourse debt financing, plus over 20 years of manufacturing experience, which strengthens confidence for long-term investments.

Low power temperature coefficient

A low power temperature coefficient translates into more stable energy production during heat waves, which is practically relevant in the Polish climate given increasingly frequent summer heat spells.

Compact size suited to residential rooftops

The module's compact construction (108 cells) makes the series well-suited for rooftop installations on single-family homes, where efficient use of limited roof area and a uniform, aesthetic appearance matter.

Trade-offs
20-year power warranty below current TOPCon standard

The manufacturer offers 10 years of product warranty and 20 years of power warranty, whereas leading TOPCon module suppliers now typically offer 25-30 years of linear power warranty, making this parameter less competitive.

No bifacial variant available

The JT SEt(L) series is monofacial only, while a direct competitor with identical power and efficiency specs - the SunLink SL5N108 - is offered in a bifacial variant, providing extra rear-side energy yield on light-colored ground or ground-mounted structures that the Jetion model cannot capture.

Notes from the database
  • At 21.5% efficiency, this panel is on par with typical TOPCon 400-450W modules
  • Power density of 215.4 W/m² is 4.8 W/m² below TOPCon 400-450W median (220.2 W/m²) - needs more roof space
  • Temperature coefficient of -0.30%/°C matches the TOPCon 400-450W median
  • Weight of 13.1 kg (8.9 kg below TOPCon 400-450W median of 22.0 kg) allows easier transport and roof mounting
  • Ranked #8022 out of 14129 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 420 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.50 % Weak Segment median 22.00%
Vmpp · Impp 31.40 V · 13.38 A Operating point at max power
Voc · Isc 38.00 V · 14.12 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1721×1133×19 mm · 1.95 m² of roof
Weight 13.1 kg Strong Strong · 8.9 kg below median
Cells 108 · TOPCon Monocrystalline
Coefficient Pmax -0.300 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.250 · 0.045 %/°C
NOCT 42 °C At 800 W/m², 20 °C ambient
Product warranty 10 years Hardware defects only
Performance warranty 20 years Weak bottom 1% · median 30 yrs
End-of-warranty output 89.0 % Equals 365 W guaranteed
Degradation 1.50 → 0.40 % 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 420 Wp appear here. The rest cover the whole series.

CNBM Jetion Linear Power Warranty (Added Value) CNBM Jetion Linear Power Warranty (Added Value) Whole series JT420SEt(L) I-V Curves at Different Irradiance JT420SEt(L) I-V Curves at Different Irradiance Whole series JT420SEt(L) I-V Curves at Different Temperatures JT420SEt(L) 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
-

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

Heat losses
-0.300 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Jetion JT420SEt(L) 420 W 21.50% -0.300 13.1 kg You are here
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg Heavier, +2.3 pp, +10 yr warranty
LX-465M/182R-96+ GG 465 W 23.80% -0.260 23.5 kg Heavier, +2.3 pp, +10 yr warranty
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg Heavier, +2.2 pp, +20 yr warranty
AIKO-A470-MAH54Mb 470 W 23.60% -0.260 21.5 kg Heavier, +2.1 pp, +10 yr warranty
AIKO-A460-MAH54Mb 460 W 23.60% -0.290 20.5 kg Heavier, +2.1 pp, +10 yr warranty
HSM-BD54-LA470 470 W 23.60% -0.260 21.5 kg Heavier, +2.1 pp, +10 yr warranty
JT410SJt(B) 410 W 21.00% -0.290 25.8 kg Heavier, -0.5 pp, +10 yr warranty
JT415SJt(B) 415 W 21.30% -0.290 25.8 kg Cooler, heavier, +10 yr warranty
JT420SJt(B) 420 W 21.50% -0.290 25.8 kg Cooler, heavier, +10 yr warranty
JT425SJt(B) 425 W 21.80% -0.290 25.8 kg Heavier, +0.3 pp, +10 yr warranty
JT425SEt(L) 425 W 21.80% -0.300 13.1 kg +0.3 pp
JT430SEt(L) 430 W 22.00% -0.300 13.1 kg +10 W, +0.5 pp
JT430SJt(B) 430 W 22.00% -0.290 25.8 kg Heavier, +0.5 pp, +10 yr warranty
JT435SEt(L) 435 W 22.30% -0.300 13.1 kg +15 W, +0.8 pp
JT440SEt(L) 440 W 22.50% -0.300 13.1 kg +20 W, +1.0 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg Heavier, +3.5 pp, +10 yr warranty

Found 1797 panels of the same or similar size to this one, within ±10 mm. See them here Found 1928 panels of the same or similar size to this one, within ±25 mm. See them here Found 3413 panels of the same or similar size to this one, within ±50 mm. See them here Found 4015 panels of the same or similar size to this one, within ±100 mm. See them here

About the JT SEt(L) 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 Jetion JT SEt(L) series panels?
Panels from the JT SEt(L) series reach a maximum power output of up to 435 Wp. This is achieved through N-type monocrystalline cells using TOPCon technology combined with a half-cut, multi-busbar layout, which reduces resistive losses and makes efficient use of the module's compact surface area.
How does TOPCon technology differ from conventional PERC cells?
TOPCon cells use an N-type structure with an additional passivation layer, reducing recombination losses compared to conventional PERC cells. In practice, this means higher initial efficiency and slower annual degradation, resulting in greater energy yield over the module's entire service life.
What warranty comes with Jetion JT SEt(L) panels?
The manufacturer provides a 10-year product warranty and a 20-year linear power warranty. This means Jetion covers material and manufacturing defects for a decade, while guaranteeing the module's power output level for two decades, giving investors predictability on their return on investment.
Are JT SEt(L) panels suitable for single-family home roofs?
Yes, the JT SEt(L) series is designed specifically for rooftop installations on single-family homes. The module's compact dimensions make installation easier on typical roof surfaces, and its uniform, aesthetic appearance suits pitched roofs well, balancing efficient use of available space with visual appeal.
Do JT SEt(L) panels perform well in high summer temperatures?
Yes, the JT SEt(L) series features a low power temperature coefficient thanks to TOPCon technology, limiting efficiency loss during heat waves. This is a key advantage in the Polish climate, where prolonged periods of high temperatures are becoming more frequent, and classic PERC panels lose more power than N-type cell modules under such conditions.
Are Jetion JT SEt(L) panels bifacial modules?
No, the JT SEt(L) series consists of monofacial panels and does not use bifacial technology. The module generates energy only from radiation hitting its front surface, which is a typical solution for rooftop installations on single-family homes, where panels are mounted close to the roof surface without the ability to capture reflected light from underneath.
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