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Silfab SIL-420 QD
Silfab Brand review

SIL-420 QD

420 Wp N-type
ComparePV verdict

Middle of its segment, modest efficiency

Rank 8,547 of 14,005
Compare panels Datasheet PDF
Power (Wp)
420
Weak · bottom 20%
Efficiency (%)
21.50
Weak · bottom 24%
Density (Wp/m²)
215.4
Typical · median 218.3
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
21.0
Typical · median 22.0 kg
Warranty (yrs)
30
Typical · median 30 yrs

The Silfab Prime NTC series is designed to maximize roof space utilization while maintaining an elegant appearance. The use of N-type cells in TOPCon technology results in more stable module performance over a longer period and lower energy losses due to natural degradation compared to many standard designs. This is a real benefit for investors who prioritize predictable power generation and a better self-consumption balance.

In practice, Prime NTC stands out due to improved efficiency in lower sunlight conditions and better performance at higher temperatures, which helps maintain production even when conditions are not ideal. An additional advantage is increased tolerance to partial shading, which is important on roofs with chimneys, skylights, or antennas.

This series is particularly well-suited for single-family homes and prosumer installations, where every square meter counts, and a consistent aesthetic is important - the triple-black design complements modern roofing materials.

Ranking

321 panels in the segment N-type 400-450 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.50% 21.91% Weak · bottom 24% 7,958
Power density 215.4 218.3 Typical 7,783
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 50.0 51.2 Typical 3,317
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 · 1 caution
Best for

Residential and shaded-installations.

Not ideal for

Tight roof space.

Watch-outs
21.50% module efficiency

Bottom 24% of the N-type 400-450 W segment, against a median of 21.91%.

Notes from the database
  • At 21.5% efficiency, this panel is on par with typical N-type 400-450W modules
  • Power density of 215.4 W/m² matches the N-type 400-450W median
  • Temperature coefficient of -0.29%/°C matches the N-type 400-450W median
  • At 21.0 kg, weight matches the N-type 400-450W median
  • In the top 57% for efficiency among all N-type panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 420 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.50 % Weak Segment median 21.91%
Vmpp · Impp 33.08 V · 12.70 A Operating point at max power
Voc · Isc 38.84 V · 13.50 A Sizes the string length
Max system voltage 1000 V Longer strings than 1000 V modules
Dimensions 1721×1133×35 mm · 1.95 m² of roof
Weight 21.0 kg Typical Typical · median 22.0 kg
Cells 108 · N-type Monocrystalline
Coefficient Pmax -0.290 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.240 · 0.040 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 25 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 89.3 % Equals 363 W guaranteed
Degradation 2.00 → 0.40 % First year, then annual

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
Silfab SIL-420 QD 420 W 21.50% -0.290 21.0 kg You are here
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg +45 W, hotter, +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, cooler, +2.1 pp
AIKO-A460-MAH54Mb 460 W 23.60% -0.290 20.5 kg +40 W, +2.1 pp
HSM-BD54-LA470 470 W 23.60% -0.260 21.5 kg +50 W, cooler, +2.1 pp
SIL-430 QD 430 W 22.10% -0.290 21.0 kg +10 W, +0.6 pp
SIL-440 QD 440 W 22.60% -0.290 21.0 kg +20 W, +1.1 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +90 W, cooler, +3.5 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +75 W, cooler, +3.3 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +85 W, cooler, +3.2 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +70 W, cooler, +3.0 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg +80 W, cooler, +3.0 pp
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg +80 W, cooler, +3.0 pp

Found 1783 panels of the same or similar size to this one, within ±10 mm. See them here Found 1914 panels of the same or similar size to this one, within ±25 mm. See them here Found 3392 panels of the same or similar size to this one, within ±50 mm. See them here Found 3978 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranty does the Silfab Prime NTC come with?
The Silfab Prime NTC includes a 25-year product warranty and a 30-year linear power output warranty — one of the longest coverage packages in the premium residential segment. Silfab guarantees the module will retain at least 87.4% of its rated output after 30 years. This reflects the manufacturer's confidence in N-type TOPCon cell durability and is a strong argument when calculating long-term ROI.
How do TOPCon cells in the Silfab Prime NTC differ from standard PERC cells?
N-type TOPCon cells feature a thin tunnel oxide passivation layer that reduces charge carrier recombination. The result is higher efficiency (up to ~22.2%), a lower annual degradation rate (~0.4%/year vs. ~0.55% for typical PERC), and a superior temperature coefficient of -0.29%/°C. Over a 30-year system lifetime, this translates to meaningfully more energy yield compared to conventional P-type PERC modules.
Is the Silfab Prime NTC a good fit for rooftops with chimneys or dormers that cause partial shading?
Yes. The Prime NTC is built with 108 half-cut N-type cells, which significantly minimize the impact of partial shading on overall module output. The series is specifically designed for residential rooftop installations where chimneys, dormers, or antennas may create intermittent shading — a common scenario on single-family homes. Its shading tolerance is a key advantage over older P-type solutions.
How does the Silfab Prime NTC perform during heat waves and overcast days?
The Prime NTC carries a temperature coefficient of -0.29%/°C, among the best in the premium residential segment, limiting power loss on hot days compared to many PERC modules. In diffuse light conditions typical of overcast weather, N-type TOPCon cells deliver better low-irradiance performance than P-type technology, contributing to higher annual energy yield in variable, temperate climates.
Does the all-black design of the Silfab Prime NTC affect its performance or longevity?
The triple-black design (black frame, black backsheet, black cells) is primarily an aesthetic choice that pairs well with modern dark roofing materials. The black frame may marginally raise operating temperature, but this is offset by the excellent -0.29%/°C temperature coefficient of the N-type cells. Silfab backs the full module with a 25-year product warranty regardless of color variant.
How many 440 W Silfab Prime NTC modules are needed for a typical 10 kWp system, and will they fit on an average roof?
With the 440 W variant (SIL-440 QD), just 23 modules deliver 10.12 kWp of nameplate capacity — several panels fewer than with older 350–380 W modules. Fewer modules for the same output means a simpler installation and less roof area consumed, which is especially valuable on rooftops with limited usable surface area.
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