--- title: "Selfa SV120M.3.4-500 500W Solar Panel - Specs & Review | ComparePV" description: "Selfa SV120M.3.4-500 500W solar panel. Specs: 22.60% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/selfa-sv120m-3-4-500" updated: 2026-09-11 --- # Selfa SV120M.3.4-500 Middle of its segment, weak in heat 140 panels in the segment N-type 500-550 W ## Identity - **Manufacturer:** Selfa - **Model:** SV120M.3.4-500 - **Series:** SV120M.3.4 - **Rated power:** 500 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 500-550 W (140 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 500 W | 520 W | Weak - bottom 8% | | | Module efficiency | 22.60% | 22.54% | Typical | 3,658 | | Power density | 225.5 | 225.3 | Typical | 3,882 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 11% | 6,093 | | Weight (kg) | 27.0 kg | 26.2 kg | Weak - bottom 23% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.60% | 22.54% | Typical | 3,658 | | Power density | 225.5 | 225.3 | Typical | 3,882 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 11% | 6,093 | | Weight per kWp | 54.0 | 50.0 | Weak - bottom 23% | 8,183 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **-0.300 %/°C temperature coefficient** - Bottom 11% of the N-type 500-550 W segment, against a median of -0.290. - **54.0 kg per kWp** - Bottom 23% of the N-type 500-550 W segment, against a median of 50.0. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Hot climates and weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 500 W - **Efficiency:** 22.60 % - **Voltage at Pmax (Vmp):** 36.50 V - **Current at Pmax (Imp):** 13.70 A - **Open-circuit voltage (Voc):** 43.97 V - **Short-circuit current (Isc):** 14.18 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.300 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 41 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 120 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 1955 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 27.0 kg - **Area:** 2.22 m2 - **Power density:** 225.5 Wp/m2 ### Warranty and degradation - **Product warranty:** 20 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.0 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.41 % - **Output after 30 years:** 435 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 3658 of 14005 | | Power density | 3882 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 8183 of 14005 | | Warranty | 21 of 14005 | ## About this series The SV120M.3.4 series is a line of bifacial solar modules from Selfa, designed for investors looking to maximize output from limited roof or ground space. The panels are built on **TOPCon N-Type technology**, allowing them to generate electricity more efficiently even under diffuse light and higher operating temperatures, translating into real energy gains under Polish climate conditions. The **bifacial design**, with tempered glass on both sides, captures light reflected from the ground to boost energy yield compared to standard single-sided modules - a solution especially valuable for installations on light-colored roofs, facades, or ground-mounted structures. **Half-cut cell** construction combined with **multi-busbar** technology reduces the risk of hot-spots, limits micro-cracks, and improves resistance to partial shading, resulting in longer service life and stable performance over years of operation. An added benefit is the **self-cleaning surface**, which allows the panels to largely clean themselves during rainfall, reducing the need for maintenance. The manufacturer backs the series with a 30-year warranty and a guaranteed positive power tolerance, making the SV120M.3.4 a solid choice for both residential installations and commercial PV projects. ## Notable figures - Efficiency of 22.6% matches the \*\*N-type 500-550W\*\* median - Power density of 225.5 W/m² matches the \*\*N-type 500-550W\*\* median - At -0.30%/°C, hot weather performance is typical for \*\*N-type 500-550W\*\* panels - Ranked #3658 out of 14005 panels for efficiency in the database ## Questions ### What is the maximum power output of the Selfa SV120M.3.4 panel? The SV120M.3.4 series reaches a maximum power output of up to 500 Wp with a conversion efficiency of around 21.5%. That's a strong result for this panel size, meaning each module delivers more energy per unit of roof or ground area, reducing the number of panels needed to reach a target system capacity. ### How much extra energy does the bifacial design of the SV120M.3.4 produce? With tempered glass on both sides, the panel also captures light reflected off the mounting surface. Depending on the albedo of that surface (bright roofing, gravel, snow), this can boost energy yield by up to 25% compared to a standard monofacial module. The gain is highest on light-colored, reflective surfaces and in ground-mount installations with sufficient clearance from the ground. ### How does the N-type TOPCon technology in the SV120M.3.4 differ from standard PERC cells? N-type TOPCon cells have lower power losses at high operating temperatures and handle diffuse, low-light conditions better than older P-type PERC cells. In practice, this means more stable energy output during summer heat, on overcast days, and during morning and evening sun angles, which translates into a real gain in annual yield under Poland's climate conditions. ### What warranty comes with the Selfa SV120M.3.4 panels? The manufacturer provides a 20-year product warranty along with a 30-year power output warranty, backed by a guaranteed positive power tolerance from day one. This means the panel should never underperform its rated nameplate power, and any performance degradation over the following decades is covered by the long-term warranty — an important safeguard for both residential and commercial PV investments. ### Does the SELF-C self-cleaning surface mean the panels never need washing? The SELF-C surface allows most dust, pollen, and dirt to be washed away naturally by rainfall, so under typical conditions the panels don't require regular cleaning. This doesn't eliminate maintenance entirely, though — during prolonged dry spells, heavy dust exposure (e.g., near farmland), or bird droppings, it's still worth inspecting the panels and washing them if needed. ### Is the Selfa SV120M.3.4 a good fit for light-colored roofs or ground-mount installations? Yes, these are exactly the scenarios that make the most of this series' bifacial design. Bright metal roofing, light-colored tiles, or ground surfaces covered with gravel or reflective sheeting increase the amount of radiation reaching the rear side of the panel. For ground-mount systems, maintaining adequate clearance between the module and the ground further maximizes the bifacial gain. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/588-3ac64621bc7d.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, lighter, +2.4 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Cooler, lighter, +2.2 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, lighter, +2.1 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | Cooler, lighter, +1.9 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | Cooler, lighter, +1.9 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | Cooler, lighter, +1.9 pp | | [Selfa SV120M.3.4-480](https://comparepv.com/panel/selfa-sv120m-3-4-480) | 480 W | -20 W, lighter, -0.9 pp | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | +60 W, cooler, +2.2 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | +55 W, cooler, +2.0 pp | | [Longi Solar LR7-60HVHL-550M](https://comparepv.com/panel/longi-lr7-60hvhl-550m) | 550 W | +50 W, lighter, +1.8 pp | | [JA Solar JAT60S40-540/LR](https://comparepv.com/panel/ja-solar-jat60s40-540-lr) | 540 W | +40 W, cooler, +1.8 pp | | [Gokin GK-5-60HG-540M](https://comparepv.com/panel/gokin-gk-5-60hg-540m) | 540 W | +40 W, cooler, +1.8 pp | | [Jinko Solar JKM545-54QL6-DV-F1-EU](https://comparepv.com/panel/jinko-solar-jkm545-54ql6-dv-f1-eu) | 545 W | +45 W, cooler, +1.7 pp | | [Longi Solar LR7-60HVH-545M](https://comparepv.com/panel/longi-lr7-60hvh-545m) | 545 W | +45 W, cooler, +1.6 pp | --- Source: https://comparepv.com/panel/selfa-sv120m-3-4-500 Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.