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Silfab Brand review

SLA-M 320

320 Wp Monocrystalline
ComparePV verdict

Warranty pick, weak in heat

Rank 12,128 of 14,005
Compare panels Datasheet PDF
Power (Wp)
320
Weak · bottom 16%
Efficiency (%)
19.60
Typical · median 20.10%
Density (Wp/m²)
195.9
Typical · median 200.6
Temp (%/°C)
-0.380
Weak · bottom 12%
Weight (kg)
19.0
Typical · median 21.0 kg
Warranty (yrs)
30
Strong · top 18%

The SLA-M series from Silfab Solar consists of monocrystalline 60-cell modules engineered for the North American market, where performance alone isn't enough without full compliance with local industry requirements. The panels are produced through a fully automated manufacturing process at ISO-certified facilities, resulting in one of the lowest defect rates in the industry. Silicon cells with 4 or 5 busbars combined with advanced material technology deliver PID (potential-induced degradation) resistance, a key factor for large commercial installations exposed to high system voltages. The lightweight aluminum low-weight frame simplifies mounting on structures with limited load-bearing capacity and is compatible with a wide range of racking systems, while the module still withstands extreme wind and snow loads. The sleek, all-black design makes SLA-M equally well suited to residential and commercial projects where installation aesthetics matter. The series targets investors and installers looking for a proven, bankable technology backed by a 25-year product warranty and 30-year power performance warranty, minimizing technical and financial risk throughout the operating life of the solar installation.

Ranking

2,653 panels in the 220-420 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 19.60% 20.10% Typical 12,589
Power density 195.9 200.6 Typical 12,593
Temperature coefficient -0.380 -0.350 Weak · bottom 12% 13,397
Weight per kWp 59.4 56.5 Typical 12,118
Performance warranty 30 yrs 25 yrs Strong · top 18% 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

1 positive · 1 caution
Best for

Residential, commercial and cold-climate.

Not ideal for

Hot climates.

Strengths
30 year performance warranty

Top 18% of the 220-420 W band, against a median of 25 yrs.

Watch-outs
-0.380 %/°C temperature coefficient

Bottom 12% of the 220-420 W band, against a median of -0.350.

Notes from the database
  • At 19.6% efficiency, this panel is 2.2pp below the database median of 21.8%
  • Power density of 195.9 W/m² is 22.2 W/m² below database median (218.1 W/m²) - needs more roof space
  • -0.38%/°C temperature coefficient - 0.08pp worse than database median (-0.30%/°C), expect higher hot weather losses
  • 19.0 kg weight - 7.5 kg lighter than database median (26.5 kg), reducing installation effort
  • Ranked #12589 out of 14005 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 320 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 19.60 % Typical Segment median 20.10%
Vmpp · Impp 33.70 V · 9.50 A Operating point at max power
Voc · Isc 40.45 V · 9.96 A Sizes the string length
Max system voltage 1000 V Longer strings than 1000 V modules
Dimensions 1650×990×38 mm · 1.63 m² of roof
Weight 19.0 kg Typical Typical · median 21.0 kg
Cells 60 Monocrystalline
Coefficient Pmax -0.380 %/°C Weak bottom 12% 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 Strong top 18% · median 25 yrs
End-of-warranty output 80.0 % Equals 256 W guaranteed
Degradation 3.00 → 0.59 % 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 -0.350
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Silfab SLA-M 320 320 W 19.60% -0.380 19.0 kg You are here
NS-300MH-72 300 W 23.32% -0.290 12.5 kg Cooler, lighter, +3.7 pp
NS-300MH-72 300 W 23.32% -0.290 12.5 kg Cooler, lighter, +3.7 pp
ZEUS 1.2 FullBlack 280W 280 W 23.31% -0.260 14.3 kg Cooler, lighter, +3.7 pp
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, +3.5 pp, -5 yr warranty
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, +3.5 pp, -5 yr warranty
GKA182M285W 285 W 23.00% - 10.8 kg -35 W, lighter, +3.4 pp
GKA182M270W 270 W 23.00% - 10.8 kg -50 W, lighter, +3.4 pp
GKA182M300W 300 W 23.00% - 16.2 kg -20 W, lighter, +3.4 pp
GKA210M320W 320 W 23.00% - 16.2 kg Lighter, +3.4 pp
SLA-M 300 Wp 300 W 18.40% -0.380 19.0 kg -20 W, -1.2 pp
SLA-M 310 310 W 19.00% -0.380 19.0 kg -10 W, -0.6 pp
SPR-MAX3-400-COM 400 W 22.60% -0.270 19.0 kg Cooler, +3.0 pp, +10 yr warranty
LEPV 400 400 W 22.31% -0.290 20.0 kg +80 W, cooler, +2.7 pp
NS-360MH-60 360 W 22.12% -0.290 17.0 kg Cooler, +2.5 pp, -5 yr warranty
NS-360MH-60 360 W 22.12% -0.290 17.0 kg Cooler, +2.5 pp, -5 yr warranty
SPR-MAX3-390-COM 390 W 22.10% -0.270 19.0 kg Cooler, +2.5 pp, +10 yr warranty

Found 182 panels of the same or similar size to this one, within ±10 mm. See them here Found 296 panels of the same or similar size to this one, within ±25 mm. See them here Found 410 panels of the same or similar size to this one, within ±50 mm. See them here Found 472 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What is the maximum power output of the Silfab SLA-M panel, and how many modules are needed for a typical 5 kWp system?
Modules in the SLA-M series reach a maximum power output of 320 Wp. At this unit power, a 5 kWp system would require approximately 15-16 panels. The panel is built on 60 monocrystalline cells with 4 or 5 busbars, delivering stable output in a relatively compact module footprint.
Are Silfab SLA-M panels suitable for large commercial installations exposed to high system voltage?
Yes, this is one of the series' key use cases. Advanced silicon cell technology provides resistance to potential induced degradation (PID), which is a particular risk in large-scale commercial arrays operating close to the 1000V maximum system voltage. This ensures the module maintains stable performance throughout its service life, even under demanding system conditions.
Is the Silfab SLA-M series still available for purchase?
No, the SLA-M series has been discontinued from current production and replaced by newer Silfab Solar module lines with higher unit power and updated cell technology. Panels may still be available in limited stock quantities through distributors, but prospective buyers should expect limited availability and confirm current stock with a seller before placing an order.
Are Silfab SLA-M panels manufactured in North America, and does that matter for BAA/ARRA-compliant projects?
Yes, the SLA-M series is built through a fully automated manufacturing process at ISO-certified facilities located in North America. Silfab Solar is headquartered in Canada and is a Tier 1 manufacturer. Panels in this series carried BAA (Buy American Act) and ARRA compliance certification, which mattered for projects funded through U.S. public financing.
What warranty comes with Silfab SLA-M panels, and what exactly does it cover?
The SLA-M series is backed by a 25-year product warranty covering material and workmanship defects, plus a 30-year linear power warranty guaranteeing a defined minimum performance level over time. This is standard for bankable manufacturers, minimizing the financial risk of a solar investment over its entire operating lifetime.
Is the Silfab SLA-M a bifacial panel that generates power from its rear side?
No, the SLA-M series is a standard monofacial panel, meaning it produces energy only from its front side. If additional energy yield from reflected light hitting the rear side is important to you, it's worth considering newer bifacial series in Silfab Solar's lineup, available as successors to this product line.
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