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Selfa Brand review

SV120M.3.3-370

370 Wp PERC
ComparePV verdict

Solid all-round for its segment

Rank 12,574 of 14,005
Compare panels Datasheet PDF
Power (Wp)
370
Typical for its class
Efficiency (%)
20.00
Typical · median 19.90%
Density (Wp/m²)
200.0
Typical · median 199.0
Temp (%/°C)
-0.360
Typical · median -0.350
Weight (kg)
20.0
Typical · median 21.4 kg
Warranty (yrs)
25
Typical · median 25 yrs

The Selfa Slim solar panel series sets new standards in combining high efficiency with modern structural design. These modules utilize advanced N-type cell technology and half-cut architecture, which significantly reduces energy losses and improves efficiency under lower sunlight conditions. A characteristic feature is the reduced frame thickness, which not only results in a lower weight for the entire system, making transport and installation easier, but above all gives the installation a slim, elegant look. This is an ideal solution for investors looking for a compromise between extreme mechanical strength and roof aesthetics. Unlike standard, massive modules, the Slim series from the Polish manufacturer offers increased resistance to the PID effect and excellent heat dissipation, which directly translates into a longer cell lifespan. These panels are primarily dedicated to modern residential construction and demanding prosumer installations, where every centimeter of surface area and impeccable appearance count. Choosing this series guarantees stability thanks to local technical support and technology optimized for Polish weather conditions. This solves the problem of excessive load on roof structures while maintaining the highest energy yield parameters per square meter.

Ranking

579 panels in the segment PERC 350-400 W
Metric This panel Median Position in segment Overall rank
Module efficiency 20.00% 19.90% Typical 12,214
Power density 200.0 199.0 Typical 12,227
Temperature coefficient -0.360 -0.350 Typical 12,345
Weight per kWp 54.1 55.8 Typical 8,267
Performance warranty 25 yrs 25 yrs Typical 9,798
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 0 caution
Best for

Residential and shaded-installations.

Notes from the database
  • Efficiency of 20.0% is 0.6pp above the PERC 0-400W median (19.4%)
  • Power density of 200.0 W/m² packs 5.6 W/m² more into the same footprint vs PERC 0-400W median (194.4 W/m²)
  • At -0.36%/°C, hot weather performance is typical for PERC 0-400W panels
  • In the top 87% for efficiency among all PERC panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 370 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 20.00 % Typical Segment median 19.90%
Vmpp · Impp 34.10 V · 10.86 A Operating point at max power
Voc · Isc 41.30 V · 11.37 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1765×1048×30 mm · 1.85 m² of roof
Weight 20.0 kg Typical Typical · median 21.4 kg
Cells 120 · PERC Monocrystalline
Coefficient Pmax -0.360 %/°C Typical median -0.350 of its segment
Coefficient Voc · Isc -0.280 · 0.060 %/°C
NOCT 41 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 25 years Typical median 25 yrs · median 25 yrs
End-of-warranty output 83.0 % Equals 297 W guaranteed
Degradation 3.00 → 0.58 % 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
-0.360 %/°C against a segment median of -0.350
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Selfa SV120M.3.3-370 370 W 20.00% -0.360 20.0 kg You are here
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, lighter, +3.1 pp
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, lighter, +3.1 pp
GKA210M320W 320 W 23.00% - 16.2 kg -50 W, +3.0 pp, +5 yr warranty
GKA210M340W 340 W 23.00% - 16.2 kg Lighter, +3.0 pp, +5 yr warranty
GKA210M360W 360 W 23.00% - 16.2 kg Lighter, +3.0 pp, +5 yr warranty
GKA210M380W (1/4*4*38) 380 W 23.00% - 17.1 kg Lighter, +3.0 pp, +5 yr warranty
GKA210M400W (1/2*4*20) 400 W 23.00% - 18.0 kg +30 W, +3.0 pp, +5 yr warranty
GKA210M400W (1/4*4*40) 400 W 23.00% - 18.0 kg +30 W, +3.0 pp, +5 yr warranty
GKA210M380W (1/2*4*19) 380 W 23.00% - 17.1 kg Lighter, +3.0 pp, +5 yr warranty
SPR-MAX3-400-COM 400 W 22.60% -0.270 19.0 kg Cooler, +2.6 pp, +15 yr warranty
SV120M.3.2-310 310 W 17.00% -0.360 20.3 kg -60 W, -3.0 pp
SV120M.3.2-360 360 W 19.70% -0.360 20.3 kg -10 W, -0.3 pp
SV120M.2.2-360 360 W 19.70% -0.360 20.3 kg -10 W, -0.3 pp
SV120M.3.2-365 365 W 20.00% -0.360 20.3 kg Very close match
SV120M.3.2-370 370 W 20.30% -0.360 20.3 kg +0.3 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +140 W, cooler, +5.0 pp

Found 233 panels of the same or similar size to this one, within ±10 mm. See them here Found 287 panels of the same or similar size to this one, within ±25 mm. See them here Found 407 panels of the same or similar size to this one, within ±50 mm. See them here Found 4204 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
Is the Selfa Slim series still available for purchase?
The Selfa Slim series has been discontinued and is no longer available as a new product through regular distribution channels. If you are interested, you may still find remaining stock at some distributors. For a new installation, it is worth asking your reseller about a current Selfa replacement with comparable specifications and aesthetics.
What warranty does the Selfa Slim solar panel come with?
Selfa provides a 12-year product warranty on the Slim series, covering material and manufacturing defects. In addition, a 25-year linear power output warranty guarantees that the panels retain a specified efficiency level throughout that period. These are standard prosumer-grade terms, giving confidence in the long-term performance of your system.
What is the maximum power output of the Selfa Slim panel and is it enough for a typical household?
The Selfa Slim reaches a peak output of up to 370 Wp per panel. For an average household consuming around 3,500–4,500 kWh per year, a system of 8–12 modules (roughly 3–4.4 kWp) is typically sufficient. The exact number of panels should be calculated by a certified installer based on roof orientation and tilt angle.
What does PERC technology mean in the Selfa Slim and what advantage does the half-cut cell architecture provide?
PERC (Passivated Emitter and Rear Cell) adds a passivation layer to the rear of each cell, recovering photons that would otherwise be lost and boosting module efficiency. The half-cut cell architecture reduces internal resistance and limits power loss under partial shading from chimneys or dormers. Together, these features deliver higher energy yield, especially during morning and evening hours.
Why does the Selfa Slim have a slimmer frame and what does that mean for rooftop installation?
The reduced frame thickness is an intentional design choice that lowers the module weight and decreases the load on the roof structure. Lighter panels are easier to carry up to the roof and faster to mount, reducing installer labor time. The slim profile also delivers a sleek, low-profile look on the roof, a key consideration for homeowners who prioritize aesthetics.
Do Selfa Slim panels perform well in low-light conditions and Poland's climate?
Yes, the Slim series was optimized for Polish weather conditions, where overcast days and diffuse irradiance are common. PERC half-cut technology improves output at low sun angles and under partial cloud cover. Enhanced PID resistance and efficient heat dissipation further protect the cells from degradation caused by Poland's variable temperature swings.
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