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Solar-Fabrik Brand review

Mono S4 Quartercut Premium DE Series 475W

475 Wp TOPCon Bifacial
ComparePV verdict

Space saver, no clear weak spot

Rank 2,861 of 14,005
Compare panels Datasheet PDF
Power (Wp)
475
Typical for its class
Efficiency (%)
23.77
Strong · top 4%
Density (Wp/m²)
237.7
Strong · top 3%
Temp (%/°C)
-0.260
Strong · top 3%
Weight (kg)
24.0
Typical · median 24.0 kg
Warranty (yrs)
30
Typical · median 30 yrs

The Mono S4 Quartercut Premium DE series combines German manufacturing precision with the latest cell architecture, resulting in a panel suited for both residential and commercial installations. At its core are bifacial monocrystalline N-Type TOPCon 3.0 cells, split into four quarter-cut segments, which reduce resistive losses and help the module maintain high efficiency even under partial shading. Thanks to its dual-sided design, the panel also captures light reflected from the ground to generate power from its rear side, meaningfully boosting the energy yield of an installation without requiring additional roof space. The build quality is confirmed by its top fire rating class A and hail resistance class 4, making this panel a solid choice for sites exposed to harsh weather conditions, including heavy hail and significant snow loads. For investors focused on long-term stability, the series offers a 30-year product warranty and 30-year linear power warranty, placing it firmly in the premium segment of PV modules on the market. A sleek, uniform black frame and production at the German Factory One further underline the aesthetic and quality-driven character of this line, built for customers who value the reliability behind the "Made in Germany" label.

Ranking

1,089 panels in the segment TOPCon 450-500 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.77% 22.52% Strong · top 4% 499
Power density 237.7 225.2 Strong · top 3% 467
Temperature coefficient -0.260 -0.290 Strong · top 3% 511
Weight per kWp 50.5 52.2 Typical 3,892
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

3 positive · 0 caution
Best for

Roofs where every square metre counts, hot roofs and southern climates and small roofs that need every watt.

Strengths
237.7 watts per square metre

Top 3% of the TOPCon 450-500 W segment, against a median of 225.2. Ranked 467th in the whole database.

-0.260 %/°C temperature coefficient

Top 3% of the TOPCon 450-500 W segment, against a median of -0.290. Ranked 511th in the whole database.

23.77% module efficiency

Top 4% of the TOPCon 450-500 W segment, against a median of 22.52%. Ranked 499th in the whole database.

Notes from the database
  • Efficiency of 23.8% is 1.2pp above the TOPCon 450-500W median (22.5%)
  • 237.7 W/m² power density - 12.5 W/m² more than TOPCon 450-500W median (225.2 W/m²), more power per roof area
  • -0.26%/°C temperature coefficient (median: -0.29%/°C) - retains ~1% more power at high temperatures
  • In the top 4% for efficiency among all TOPCon panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 475 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.77 % Strong Segment median 22.52%
Vmpp · Impp 31.05 V · 15.30 A Operating point at max power
Voc · Isc 36.58 V · 15.93 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1762×1134×30 mm · 2.00 m² of roof
Weight 24.0 kg Typical Typical · median 24.0 kg
Cells 192 · TOPCon Monocrystalline
Coefficient Pmax -0.260 %/°C Strong top 3% of its segment
Coefficient Voc · Isc -0.240 · 0.046 %/°C
NOCT 41 °C At 800 W/m², 20 °C ambient
Product warranty 30 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 88.8 % Equals 422 W guaranteed

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
-0.260 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Solar-Fabrik Mono S4 Quartercut Premium DE Series 475W 475 W 23.77% -0.260 24.0 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +35 W, cooler, +1.2 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +20 W, lighter, +1.0 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +30 W, cooler, +0.9 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +15 W, lighter, +0.7 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg +25 W, cooler, +0.7 pp
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg +25 W, lighter, +0.7 pp
Mono S4 HC V 400 BF-DG 400 W 20.02% -0.290 24.0 kg -75 W, hotter, -3.8 pp
Mono S4 Halfcut Chroma Orange 420W 420 W 21.02% -0.290 24.0 kg -55 W, hotter, -2.8 pp
Mono S4 Halfcut Trend Full Black 445 W 445 W 22.30% -0.290 24.9 kg -30 W, hotter, -1.5 pp
Mono S4 Halfcut Trend Full Black 450 W 450 W 22.50% -0.290 24.9 kg -25 W, hotter, -1.3 pp
Mono S4 Halfcut Trend White 455W 455 W 22.80% -0.310 24.9 kg -20 W, hotter, -1.0 pp

Found 1395 panels of the same or similar size to this one, within ±10 mm. See them here Found 1425 panels of the same or similar size to this one, within ±25 mm. See them here Found 3614 panels of the same or similar size to this one, within ±50 mm. See them here Found 3962 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What is N-Type TOPCon 3.0 cell technology used in the Solar-Fabrik Mono S4 Quartercut Premium DE panels, and how does it differ from standard monocrystalline panels?
TOPCon 3.0 is an N-Type cell technology featuring an additional passivation layer on the rear side of the cell, which reduces electron recombination and boosts efficiency compared to conventional P-Type PERC cells. Combined with quartercut cell division, the panel achieves higher power output with lower resistive losses and handles high temperatures and partial shading better than older technologies.
Are Mono S4 Quartercut Premium DE panels suitable for roofs exposed to hail and heavy snow loads?
Yes, the series holds the highest fire resistance class A and hail resistance class 4, meaning it withstands impacts from large hailstones without mechanical damage. The robust construction and reinforced frame also handle heavy snow loads well, making it a safe choice for installations in regions with harsh weather conditions.
How much extra energy does the bifacial design of the Mono S4 Quartercut Premium DE panels generate?
Thanks to bifacial cells, the panel also generates energy from its rear side, capturing light reflected off the roof, ground, or snow. Actual gain depends on the color and reflectivity of the mounting surface and installation height, but in practice this can mean several to over ten percent more energy output than a comparable monofacial panel, without increasing roof footprint.
What warranty does Solar-Fabrik offer on the Mono S4 Quartercut Premium DE series, and what does it cover?
The manufacturer provides a 30-year product warranty covering material and workmanship defects, plus a 30-year linear power warranty guaranteeing a minimum performance level throughout the module's service life. This is one of the longest warranty periods currently available on the PV market, placing the series in the premium segment and increasing the long-term investment's security.
How many Solar-Fabrik Mono S4 Quartercut Premium DE panels are needed for a 10 kWp installation?
With a unit power of 485 Wp, roughly 21 panels are needed to reach an installation of about 10 kWp (10,000 W ÷ 485 W ≈ 20.6, rounded up to 21 units). Thanks to the high per-panel wattage, the array requires less roof space than an equivalent system built with lower-power modules, which matters when usable roof area is limited.
Is it worth paying more for panels manufactured in Germany, like the Solar-Fabrik Mono S4 Quartercut Premium DE?
Production at Solar-Fabrik's German Factory One involves strict quality control and compliance with EU standards, resulting in more consistent parameters and lower risk of factory defects compared to cheaper non-European modules. The higher purchase price is typically offset by longer service life, a solid 30/30-year warranty, and reliable access to warranty support within Europe.
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