--- title: "Silfab SLG-M 350 350W Solar Panel - Specs & Review | ComparePV" description: "Silfab SLG-M 350 350W solar panel. Specs: 17.90% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/silfab-slg-m-350" updated: 2026-09-11 --- # Silfab SLG-M 350 Middle of its segment, weak in heat 4,542 panels in the 250-450 W band, all technologies ## Identity - **Manufacturer:** Silfab - **Model:** SLG-M 350 - **Series:** SLG-M - **Rated power:** 350 W - **Cell technology:** Monocrystalline ## How it compares Compared against 250-450 W band, all technologies (4542 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 350 W | 410 W | Weak - bottom 16% | | | 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 (kg) | 23.0 kg | 21.5 kg | Weak - bottom 12% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | 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 | ### Watch out for - **-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. - **Best for:** Residential and commercial. - **Not ideal for:** Hot climates, tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 350 W - **Efficiency:** 17.90 % - **Voltage at Pmax (Vmp):** 38.90 V - **Current at Pmax (Imp):** 9.02 A - **Open-circuit voltage (Voc):** 47.50 V - **Short-circuit current (Isc):** 9.61 A - **Max system voltage:** 1000 V ### Temperature - **Temperature coefficient of Pmax:** -0.380 %/degC - **Temperature coefficient of Voc:** -0.300 %/degC - **Temperature coefficient of Isc:** 0.030 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell count:** 72 ### Physical - **Length:** 1970 mm - **Width:** 990 mm - **Thickness:** 38 mm - **Weight:** 23.0 kg - **Area:** 1.95 m2 - **Power density:** 179.5 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 80.0 % - **First-year degradation:** 3.00 % - **Annual degradation:** 0.64 % - **Output after 30 years:** 275 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 13249 of 14005 | | Power density | 13223 of 14005 | | Temperature coefficient | 13397 of 14005 | | Weight | 13103 of 14005 | | Warranty | 21 of 14005 | ## About this series 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. ## Notable figures - 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 ## Questions ### 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. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/Silfab-SLG-M-350-SF-0G-20191127-K-Final1-b28a7920e1de.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [JA Solar NS-300MH-72](https://comparepv.com/panel/ja-solar-ns-300mh-72) | 300 W | Cooler, lighter, +5.4 pp | | [PolyCrown Solar Tech NS-300MH-72](https://comparepv.com/panel/polycrown-solar-tech-ns-300mh-72) | 300 W | Cooler, lighter, +5.4 pp | | [JA Solar NS-330MH-80](https://comparepv.com/panel/ja-solar-ns-330mh-80) | 330 W | Cooler, lighter, +5.2 pp | | [PolyCrown Solar Tech NS-330MH-80](https://comparepv.com/panel/polycrown-solar-tech-ns-330mh-80) | 330 W | Cooler, lighter, +5.2 pp | | [Gamko New Energy GKA182M300W](https://comparepv.com/panel/gamko-new-energy-gka182m300w) | 300 W | -50 W, lighter, +5.1 pp | | [Gamko New Energy GKA210M320W](https://comparepv.com/panel/gamko-new-energy-gka210m320w) | 320 W | -30 W, lighter, +5.1 pp | | [Gamko New Energy GKA210M340W](https://comparepv.com/panel/gamko-new-energy-gka210m340w) | 340 W | -10 W, lighter, +5.1 pp | | [Gamko New Energy GKA210M360W](https://comparepv.com/panel/gamko-new-energy-gka210m360w) | 360 W | +10 W, lighter, +5.1 pp | | [Gamko New Energy GKA210M380W (1/4\*4\*38)](https://comparepv.com/panel/gamko-new-energy-gka210m380w-1-4-4-38) | 380 W | +30 W, lighter, +5.1 pp | | [Gamko New Energy GKA210M400W (1/2\*4\*20)](https://comparepv.com/panel/gamko-new-energy-gka210m400w-1-2-4-20) | 400 W | +50 W, lighter, +5.1 pp | | [Silfab SLG-M 360](https://comparepv.com/panel/silfab-slg-m-360) | 360 W | +10 W, +0.6 pp | | [Silfab SLG-M 370](https://comparepv.com/panel/silfab-slg-m-370) | 370 W | +20 W, +1.1 pp | | [Maxeon SPR-MAX7-475](https://comparepv.com/panel/maxeon-spr-max7-475) | 475 W | +125 W, cooler, +6.1 pp | | [Maxeon SPR-MAX7-470](https://comparepv.com/panel/maxeon-spr-max7-470) | 470 W | +120 W, cooler, +5.8 pp | | [Maxeon SPR-MAX7-465](https://comparepv.com/panel/maxeon-spr-max7-465) | 465 W | +115 W, cooler, +5.6 pp | | [Maxeon SPR-MAX6-440](https://comparepv.com/panel/maxeon-spr-max6-440) | 440 W | Cooler, +4.9 pp, +10 yr warranty | --- Source: https://comparepv.com/panel/silfab-slg-m-350 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.