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Silfab Brand review

SLG-M 350

350 Wp Monocrystalline
ComparePV verdict

Middle of its segment, weak in heat

Rank 12,477 of 14,005
Compare panels Datasheet PDF
Power (Wp)
350
Weak · bottom 16%
Efficiency (%)
17.90
Weak · bottom 11%
Density (Wp/m²)
179.5
Weak · bottom 11%
Temp (%/°C)
-0.380
Weak · bottom 7%
Weight (kg)
23.0
Weak · 1.5 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The SLG-M series consists of 72-cell monocrystalline modules engineered to deliver maximum power density on every square meter of roof or ground space. The panels feature a lightweight, reinforced frame construction rated to withstand loads of up to 5400 Pa, making them suitable for both structurally limited rooftops and ground-mount or tracker installations. The cell technology used provides PID resistance in line with IEC 62804-1, ensuring stable energy output throughout the module's operating life. SLG-M panels are built through a fully automated manufacturing process in North America, keeping factory defect rates remarkably low and guaranteeing consistent quality across every unit. The sleek, all-black design blends seamlessly into a building's architecture without sacrificing performance. The series is backed by a 25-year product warranty and a 30-year power warranty, making it an attractive choice for investors seeking long-term confidence in their solar investment. This is a panel for installers and homeowners who value proven technology, clean aesthetics, and lasting reliability, without having to trade one for the other.

Ranking

4,542 panels in the 250-450 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 17.90% 20.74% Weak · bottom 11% 13,249
Power density 179.5 207.4 Weak · bottom 11% 13,223
Temperature coefficient -0.380 -0.340 Weak · bottom 7% 13,397
Weight per kWp 65.7 54.4 Weak · bottom 12% 13,103
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 · 3 caution
Best for

Residential and commercial.

Not ideal for

Hot climates, tight roof space and roofs where every square metre has to count.

Watch-outs
-0.380 %/°C temperature coefficient

Bottom 7% of the 250-450 W band, against a median of -0.340. Ranked 13,397th in the whole database.

17.90% module efficiency

Bottom 11% of the 250-450 W band, against a median of 20.74%.

179.5 watts per square metre

Bottom 11% of the 250-450 W band, against a median of 207.4.

Notes from the database
  • Module efficiency of 17.9% is 3.9pp below average for database panels (median: 21.8%)
  • Power density of 179.5 W/m² is 38.6 W/m² below database median (218.1 W/m²) - needs more roof space
  • At -0.38%/°C, loses 0.08pp more power per degree than database median (-0.30%/°C)
  • Weight of 23.0 kg (3.5 kg below database median of 26.5 kg) allows easier transport and roof mounting
  • Ranked #13249 out of 14005 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 350 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 17.90 % Weak Segment median 20.74%
Vmpp · Impp 38.90 V · 9.02 A Operating point at max power
Voc · Isc 47.50 V · 9.61 A Sizes the string length
Max system voltage 1000 V Longer strings than 1000 V modules
Dimensions 1970×990×38 mm · 1.95 m² of roof
Weight 23.0 kg Weak Weak · 1.5 kg above median
Cells 72 Monocrystalline
Coefficient Pmax -0.380 %/°C Weak bottom 7% of its segment
Coefficient Voc · Isc -0.300 · 0.030 %/°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 80.0 % Equals 275 W guaranteed
Degradation 3.00 → 0.64 % 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
-0.380 %/°C against a segment median of -0.340
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Silfab SLG-M 350 350 W 17.90% -0.380 23.0 kg You are here
NS-300MH-72 300 W 23.32% -0.290 12.5 kg Cooler, lighter, +5.4 pp
NS-300MH-72 300 W 23.32% -0.290 12.5 kg Cooler, lighter, +5.4 pp
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, lighter, +5.2 pp
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, lighter, +5.2 pp
GKA182M300W 300 W 23.00% - 16.2 kg -50 W, lighter, +5.1 pp
GKA210M320W 320 W 23.00% - 16.2 kg -30 W, lighter, +5.1 pp
GKA210M340W 340 W 23.00% - 16.2 kg -10 W, lighter, +5.1 pp
GKA210M360W 360 W 23.00% - 16.2 kg +10 W, lighter, +5.1 pp
GKA210M380W (1/4*4*38) 380 W 23.00% - 17.1 kg +30 W, lighter, +5.1 pp
GKA210M400W (1/2*4*20) 400 W 23.00% - 18.0 kg +50 W, lighter, +5.1 pp
SLG-M 360 360 W 18.50% -0.380 23.0 kg +10 W, +0.6 pp
SLG-M 370 370 W 19.00% -0.380 23.0 kg +20 W, +1.1 pp
SPR-MAX7-475 475 W 24.00% -0.270 21.1 kg +125 W, cooler, +6.1 pp
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg +120 W, cooler, +5.8 pp
SPR-MAX7-465 465 W 23.50% -0.270 21.1 kg +115 W, cooler, +5.6 pp
SPR-MAX6-440 440 W 22.80% -0.290 20.9 kg Cooler, +4.9 pp, +10 yr warranty

Found 52 panels of the same or similar size to this one, within ±10 mm. See them here Found 273 panels of the same or similar size to this one, within ±25 mm. See them here Found 437 panels of the same or similar size to this one, within ±50 mm. See them here Found 542 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
Are Silfab SLG-M 370 panels still available for purchase?
The SLG-M series has been discontinued by Silfab Solar and replaced by newer module lines. Some SLG-M units may still be available through distributors as remaining stock, but buyers should check the production date and confirm warranty validity with the seller, since the manufacturer no longer provides active support for this specific model.
What is the maximum power output of the Silfab SLG-M panel, and how many are needed for a typical 6 kW system?
The SLG-M panel reaches a maximum power output of 370 Wp with 72 monocrystalline cells. To build a system of roughly 6 kW, you would need about 16 modules. Thanks to its high power density, this panel works well on roofs with limited surface area where maximizing output per square meter matters most.
What warranty applies to Silfab SLG-M panels, and is it still reliable now that the series is discontinued?
Silfab provides a 25-year product warranty and a 30-year power warranty for the SLG-M series. Although the series is no longer manufactured, Silfab remains an active company and continues to honor warranties issued for previously sold modules, so the warranty documentation stays valid for its full declared term.
Can Silfab SLG-M panels withstand heavy snow loads or strong wind?
Yes, the reinforced frame construction of the SLG-M withstands loads up to 5400 Pa, higher than many standard modules. This makes the panel suitable for regions with heavy snowfall and for installations exposed to strong wind, including trackers and ground-mount systems where the structure faces greater mechanical stress.
What does PID resistance mean for the SLG-M series, and why does it matter?
Potential-induced degradation (PID) is a phenomenon that reduces module power due to voltage differences between the cells and the grounded frame. SLG-M panels are tested to IEC 62804-1 and resist this effect, resulting in more stable energy production over the panel's lifetime, especially important in large arrays with multiple series-connected strings.
How do Silfab SLG-M panels differ from typical modules manufactured in Asia?
The key difference is the manufacturing location: SLG-M is produced in a fully automated facility in North America, which reduces factory defects and delivers more consistent quality than many manually assembled production lines. Silfab is a tier 1 manufacturer, which further reflects the company's financial stability and the reliability of its warranty commitments.
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