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Selfa Brand review

SV66M.2-350

350 Wp PERC
ComparePV verdict

Warranty pick, weak in heat

Rank 12,596 of 14,005
Compare panels Datasheet PDF
Power (Wp)
350
Weak · bottom 2%
Efficiency (%)
19.10
Weak · bottom 16%
Density (Wp/m²)
190.9
Weak · bottom 16%
Temp (%/°C)
-0.370
Weak · bottom 16%
Weight (kg)
20.0
Typical · median 21.4 kg
Warranty (yrs)
30
Strong · top 13%

The SV66M.2 series consists of monocrystalline photovoltaic modules in a FULL BLACK design, built for installers and homeowners who want rooftop aesthetics to go hand in hand with long-term reliability. The panels are based on PERC cells and 5 busbar technology, which reduces the risk of micro-cracks and supports more stable module performance throughout its service life. A key differentiator of the series is SELF-C technology, a surface treatment that limits dirt buildup and directly reduces energy yield losses during periods of limited maintenance. The modules are PID free certified, protecting them against potential-induced degradation, and the manufacturer guarantees a positive power tolerance only, removing the risk of purchasing a panel below its declared output. The frame and laminate withstand heavy snow and wind loads, making the series a solid choice for installations in demanding climates. As a Polish manufacturer, Selfa provides warranty service handled locally across the country, shortening claim handling times compared to imported brands. The SV66M.2 series works well both in residential systems and smaller commercial installations, where the combination of aesthetics, durability, and responsive after-sales support matters most.

Ranking

579 panels in the segment PERC 350-400 W
Metric This panel Median Position in segment Overall rank
Module efficiency 19.10% 19.90% Weak · bottom 16% 12,902
Power density 190.9 199.0 Weak · bottom 16% 12,898
Temperature coefficient -0.370 -0.350 Weak · bottom 16% 13,081
Weight per kWp 57.1 55.8 Typical 11,083
Performance warranty 30 yrs 25 yrs Strong · top 13% 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

1 positive · 3 caution
Best for

Residential and commercial.

Not ideal for

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

Strengths
30 year performance warranty

Top 13% of the PERC 350-400 W segment, against a median of 25 yrs.

Watch-outs
-0.370 %/°C temperature coefficient

Bottom 16% of the PERC 350-400 W segment, against a median of -0.350.

190.9 watts per square metre

Bottom 16% of the PERC 350-400 W segment, against a median of 199.0.

19.10% module efficiency

Bottom 16% of the PERC 350-400 W segment, against a median of 19.90%.

Notes from the database
  • At 19.1% efficiency, this panel is on par with typical PERC 0-400W modules
  • At 190.9 W/m², this panel generates 3.5 W/m² less per unit area than PERC 0-400W median (194.4 W/m²)
  • At -0.37%/°C, hot weather performance is typical for PERC 0-400W panels
  • Ranked #12902 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 19.10 % Weak Segment median 19.90%
Vmpp · Impp 37.10 V · 9.44 A Operating point at max power
Voc · Isc 45.10 V · 9.85 A Sizes the string length
Max system voltage 1000 V Longer strings than 1000 V modules
Dimensions 1830×1002×35 mm · 1.83 m² of roof
Weight 20.0 kg Typical Typical · median 21.4 kg
Cells 66 · PERC Monocrystalline
Coefficient Pmax -0.370 %/°C Weak bottom 16% of its segment
Coefficient Voc · Isc -0.280 · 0.060 %/°C
NOCT 42 °C At 800 W/m², 20 °C ambient
Product warranty 15 years Hardware defects only
Performance warranty 30 years Strong top 13% · median 25 yrs
End-of-warranty output 91.8 % Equals 321 W guaranteed
Degradation 3.00 → 0.18 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by Selfa in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 350 Wp appear here. The rest cover the whole series.

Current (I) and Power (P) vs Voltage curves at 200-1000 W/m² irradiance Current (I) and Power (P) vs Voltage curves at 200-1000 W/m² irradiance Whole series

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
-0.370 %/°C against a segment median of -0.350
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Selfa SV66M.2-350 350 W 19.10% -0.370 20.0 kg You are here
NS-300MH-72 300 W 23.32% -0.290 12.5 kg Cooler, lighter, +4.2 pp
NS-300MH-72 300 W 23.32% -0.290 12.5 kg Cooler, lighter, +4.2 pp
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, lighter, +4.0 pp
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, lighter, +4.0 pp
GKA182M300W 300 W 23.00% - 16.2 kg -50 W, lighter, +3.9 pp
GKA210M320W 320 W 23.00% - 16.2 kg -30 W, lighter, +3.9 pp
GKA210M340W 340 W 23.00% - 16.2 kg -10 W, lighter, +3.9 pp
GKA210M360W 360 W 23.00% - 16.2 kg +10 W, lighter, +3.9 pp
GKA210M380W (1/4*4*38) 380 W 23.00% - 17.1 kg +30 W, lighter, +3.9 pp
GKA210M400W (1/2*4*20) 400 W 23.00% - 18.0 kg +50 W, lighter, +3.9 pp
SPR-MAX7-475 475 W 24.00% -0.270 21.1 kg +125 W, +4.9 pp, +10 yr warranty
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg +120 W, +4.6 pp, +10 yr warranty
SPR-MAX7-465 465 W 23.50% -0.270 21.1 kg +115 W, +4.4 pp, +10 yr warranty
JT440SYK(B) 440 W 22.90% -0.240 23.0 kg +90 W, cooler, +3.8 pp
SPR-MAX6-440 440 W 22.80% -0.290 20.9 kg +90 W, +3.7 pp, +10 yr warranty
JT435SYk(B) 435 W 22.70% -0.240 23.0 kg +85 W, cooler, +3.6 pp

Found 4 panels of the same or similar size to this one, within ±10 mm. See them here Found 18 panels of the same or similar size to this one, within ±25 mm. See them here Found 89 panels of the same or similar size to this one, within ±50 mm. See them here Found 541 panels of the same or similar size to this one, within ±100 mm. See them here

About the SV66M.2 series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this module's own.

Are Selfa SV66M.2 solar panels still available for purchase?
The SV66M.2 series has been discontinued and is no longer offered as a current model in Selfa's lineup. Availability is now limited to remaining distributor stock. Warranty terms (15-year product warranty, 30-year power warranty) remain valid for already purchased and installed modules regardless of the series' discontinuation.
What does SELF-C technology do in the SV66M.2 panels, and does it actually reduce soiling?
SELF-C is Selfa's proprietary surface treatment that reduces the buildup of dust, pollen, and dirt on the panel glass. In practice this means smaller output losses between cleaning cycles, especially valuable on low-pitch roofs where rain doesn't wash off grime as effectively. It doesn't replace periodic cleaning but noticeably extends the interval between maintenance.
What is the actual power output of the SV66M.2 panel, and does the manufacturer guarantee the rated value?
SV66M.2 modules reach a maximum power of up to 350 Wp. Selfa guarantees positive-only power tolerance, meaning a purchased panel is never below its labeled rating - in practice often slightly above it. This matters when designing a system, since it removes the risk of underestimating energy yield in ROI calculations.
Are SV66M.2 panels suitable for a residential installation on a sloped roof?
Yes, the SV66M.2 series in Full Black finish is designed with sloped residential roof aesthetics in mind. PERC cells with 5 busbar technology deliver stable module performance, and the reinforced frame withstands snow and wind loads typical of the Polish climate. The panel works well both for small home installations and larger commercial systems.
How is the PID-free certification of SV66M.2 different from standard PV modules?
PID-free certification confirms that the SV66M.2 module has passed testing for resistance to Potential Induced Degradation and won't lose performance due to voltage differences within a string. Modules without this certification can lose several percent of power over time in large arrays, making PID-free an important factor when designing long strings.
How does Selfa's warranty service for the SV66M.2 compare to imported brands?
As a Polish manufacturer, Selfa handles warranty claims locally, without shipping panels abroad or waiting long for a decision from an overseas manufacturer. This shortens claim processing times compared to many Asian or Western European brands. The product warranty runs 15 years and the power warranty 30 years, even though the SV66M.2 series is no longer in production.
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