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Jetion Brand review

JT420SJt(B)

420 Wp TOPCon Bifacial 85%
ComparePV verdict

Middle of its segment, heavy for its output

Rank 10,760 of 14,129
Compare panels Datasheet PDF
Power (Wp)
420
Weak · bottom 16%
Efficiency (%)
21.50
Weak · bottom 17%
Density (Wp/m²)
215.1
Weak · bottom 18%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
25.8
Weak · 3.8 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The JT SJt(B) series consists of dual-glass photovoltaic modules built on monocrystalline N-type TOPCon cells with multi-busbar technology, engineered to maximize energy yield while minimizing degradation risk. The defining feature of this series is its bifacial energy generation - thanks to a high bifaciality factor, the module captures additional energy reflected from the ground surface, meaningfully reducing the levelized cost of energy (LCOE) over the system's lifetime. The dual-glass construction eliminates the LID/LETID degradation issues typical of older technologies, while strict manufacturing quality control, including double EL inspection, reduces the risk of PID effect to near zero. These panels are built to withstand harsh weather conditions - rated for high snow and wind loads and tested against rigorous hail resistance standards, making them a solid choice for installations in climates with variable weather patterns. The JT SJt(B) series works well both in rooftop projects and ground-mounted PV farms where long-term reliability and stable output matter most. The manufacturer backs the modules with a multi-year warranty covering materials as well as linear power output degradation, adding further security to the investment.

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 215.1 220.2 Weak · bottom 18% 7,946
Temperature coefficient -0.290 -0.290 Typical 2,220
Weight per kWp 61.4 51.5 Weak · bottom 5% 12,739
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 · 4 caution
Best for

Residential, commercial and cold-climate.

Not ideal for

Weight-limited structures, tight roof space and roofs where every square metre has to count.

Watch-outs
61.4 kg per kWp

Bottom 5% of the TOPCon 400-450 W segment, against a median of 51.5. Ranked 12,739th in the whole database.

21.50% module efficiency

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

215.1 watts per square metre

Bottom 18% of the TOPCon 400-450 W segment, against a median of 220.2.

What owners get
N-type TOPCon technology, low degradation

Multi-busbar N-type TOPCon cells deliver 21-22% efficiency with a very low degradation profile: ≤1% first-year and ≤0.4% annual thereafter. This is a clear improvement over legacy PERC degradation rates, translating into higher real-world lifetime energy yield.

Bifacial dual-glass construction

The dual-glass design and high bifaciality factor enable additional rear-side energy harvest from ground-reflected light, lowering the LCOE compared to monofacial modules of similar power class, e.g. Boviet GAMMA (430 Wp, 19.8% efficiency) at the same peak power.

Confirmed Tier-1 status (BNEF Q1 2026)

Jetion Solar, in operation since 2004, appears on the current BloombergNEF Tier 1 list (Q1 2026 update), confirming manufacturer bankability and easing project financing through banking institutions.

30-year linear power warranty

The manufacturer backs the modules with a 30-year linear power output warranty, aligning with best-in-class practice for premium TOPCon lines and giving investors predictable long-term energy production.

Resistance to harsh conditions and PID

Double EL inspection during manufacturing keeps PID risk near zero, and the modules pass rigorous snow, wind, and hail load testing, making the series suitable for both rooftop installations and utility-scale PV farms in variable climates.

Trade-offs
Shorter 12-year product warranty

The materials and workmanship warranty is set at 12 years, whereas several competing Tier-1 TOPCon lines now standardly offer 15-25 years of product coverage alongside the same 30-year linear power warranty. This can be a differentiating factor when comparing bankable manufacturer offers.

Notes from the database
  • Efficiency of 21.5% matches the TOPCon 400-450W median
  • Power density of 215.1 W/m² is 5.1 W/m² below TOPCon 400-450W median (220.2 W/m²) - needs more roof space
  • At -0.29%/°C, hot weather performance is typical for TOPCon 400-450W panels
  • At 25.8 kg (3.8 kg above TOPCon 400-450W median of 22.0 kg), requires checking roof load capacity
  • Bifacial design (85% factor) captures reflected light - adds 4-13% yield on ground-mount or white roof

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 31.50 V · 13.34 A Operating point at max power
Voc · Isc 38.00 V · 14.11 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1722×1134×30 mm · 1.95 m² of roof
Weight 25.8 kg Weak Weak · 3.8 kg above median
Cells 108 · TOPCon Monocrystalline
Bifaciality 85 % Rear output as a share of front
Coefficient Pmax -0.290 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.240 · 0.045 %/°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 87.4 % Equals 367 W guaranteed
Degradation 1.00 → 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 Additional Value CNBM Jetion Linear Power Warranty Additional Value 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
-0.290 %/°C against a segment median of -0.290
-
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 JT420SJt(B) 420 W 21.50% -0.290 25.8 kg You are here
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg +45 W, lighter, +2.3 pp
LX-465M/182R-96+ GG 465 W 23.80% -0.260 23.5 kg +45 W, cooler, +2.3 pp
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg +50 W, +2.2 pp, +10 yr warranty
AIKO-A470-MAH54Mb 470 W 23.60% -0.260 21.5 kg +50 W, lighter, +2.1 pp
AIKO-A460-MAH54Mb 460 W 23.60% -0.290 20.5 kg +40 W, lighter, +2.1 pp
HSM-BD54-LA470 470 W 23.60% -0.260 21.5 kg +50 W, lighter, +2.1 pp
JT410SJt(B) 410 W 21.00% -0.290 25.8 kg -10 W, -0.5 pp
JT415SJt(B) 415 W 21.30% -0.290 25.8 kg Very close match
JT420SEt(L) 420 W 21.50% -0.300 13.1 kg Hotter, lighter, -10 yr warranty
JT425SJt(B) 425 W 21.80% -0.290 25.8 kg +0.3 pp
JT425SEt(L) 425 W 21.80% -0.300 13.1 kg Lighter, +0.3 pp, -10 yr warranty
JT430SEt(L) 430 W 22.00% -0.300 13.1 kg Lighter, +0.5 pp, -10 yr warranty
JT430SJt(B) 430 W 22.00% -0.290 25.8 kg +10 W, +0.5 pp
JT435SEt(L) 435 W 22.30% -0.300 13.1 kg Lighter, +0.8 pp, -10 yr warranty
JT440SEt(L) 440 W 22.50% -0.300 13.1 kg Lighter, +1.0 pp, -10 yr warranty
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +90 W, cooler, +3.5 pp

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 4007 panels of the same or similar size to this one, within ±100 mm. See them here

About the JT SJt(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 N-type TOPCon technology in Jetion JT SJt(B) panels differ from older PERC cells?
N-type TOPCon cells offer lower light-induced degradation (LID) and higher conversion efficiency than classic P-type PERC cells. In practice this means higher output in the early years of operation and a slower power decline over time, resulting in a better return on investment across the system's entire lifecycle.
Do Jetion JT SJt(B) bifacial modules really generate more energy?
Yes, thanks to the dual-glass design, the rear side of the module captures light reflected off the ground, roof, or surroundings. The actual gain depends on the albedo of the surface and mounting height, but with a bright surface (e.g., gravel, white roofing membrane) you can expect several to over ten percent more energy than from a monofacial panel of the same nominal power.
What warranty applies to the 430 Wp JT SJt(B) series modules?
The manufacturer provides a 12-year product warranty covering material and workmanship defects, plus a 30-year linear power output warranty. This level of coverage is typical for tier 1 manufacturers and means the panel should still perform at the guaranteed level even after 30 years of operation.
Are JT SJt(B) panels suitable for roofs exposed to heavy snow loads?
Yes, the JT SJt(B) series undergoes rigorous mechanical load testing, including high snow and wind load resistance, and the dual-glass construction further increases module rigidity. This makes the panels suitable both for rooftop installations in regions with heavy snowfall and for ground-mount PV farms exposed to strong wind.
Does the dual-glass construction in JT SJt(B) modules increase the risk of PID effect?
No, the dual-glass construction combined with strict production quality control, including double EL (electroluminescence) inspection, significantly reduces the risk of PID effect. This design also eliminates the LID and LETID degradation issues typical of older technologies, resulting in more stable energy production throughout the module's lifespan.
Are Jetion JT SJt(B) panels a good choice for a ground-mount solar farm or better for rooftop use?
The series performs well in both applications. High resistance to hail, wind, and snow along with bifacial energy generation make it attractive for ground-mount PV farms, where modules can be mounted to fully exploit the bifacial effect. At the same time, its long-term reliability and extended warranty make it well suited for rooftop projects focused on stable productivity.
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