--- title: "Sunlike Solar SKT420M10-108D5 420W Solar Panel - Specs & Review | ComparePV" description: "Sunlike Solar SKT420M10-108D5 420W solar panel. Specs: 21.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/sunlike-solar-skt420m10-108d5" updated: 2026-09-11 --- # Sunlike Solar SKT420M10-108D5 Middle of its segment, modest efficiency 52 panels in the segment Back Contact 400-450 W ## Identity - **Manufacturer:** Sunlike Solar - **Model:** SKT420M10-108D5 - **Series:** SKT420~440M10-108D5 HPBC Half Cell PV Module Series - **Rated power:** 420 W - **Cell technology:** Back Contact ## How it compares Compared against segment Back Contact 400-450 W (52 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 420 W | 435 W | Weak - bottom 16% | | | Module efficiency | 21.50% | 22.30% | Weak - bottom 9% | 7,958 | | Power density | 215.1 | 222.7 | Weak - bottom 9% | 7,882 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 20.8 kg | 20.8 kg | Weak - bottom 24% | | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.50% | 22.30% | Weak - bottom 9% | 7,958 | | Power density | 215.1 | 222.7 | Weak - bottom 9% | 7,882 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 49.5 | 48.2 | Weak - bottom 24% | 3,056 | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Watch out for - **21.50% module efficiency** - Bottom 9% of the Back Contact 400-450 W segment, against a median of 22.30%. Ranked 7,958th in the whole database. - **215.1 watts per square metre** - Bottom 9% of the Back Contact 400-450 W segment, against a median of 222.7. Ranked 7,882nd in the whole database. - **49.5 kg per kWp** - Bottom 24% of the Back Contact 400-450 W segment, against a median of 48.2. - **Not ideal for:** Tight roof space, roofs where every square metre has to count and weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 420 W - **Efficiency:** 21.50 % - **Voltage at Pmax (Vmp):** 32.44 V - **Current at Pmax (Imp):** 12.95 A - **Open-circuit voltage (Voc):** 38.73 V - **Short-circuit current (Isc):** 14.00 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.230 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** Back Contact - **Cell count:** 108 ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 20.8 kg - **Area:** 1.95 m2 - **Power density:** 215.1 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 88.9 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.42 % - **Output after 30 years:** 365 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 7958 of 14005 | | Power density | 7882 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 3056 of 14005 | | Warranty | 9798 of 14005 | ## About this series The Sunlike Solar SKT420-440M10-108D5 HPBC module series introduces a new quality to the Polish market thanks to the use of breakthrough **HPBC cell technology**, which eliminates the traditional shading problem caused by busbars. Moving all contacts to the rear side of the cell means that the **lack of front busbars** allows for the absorption of significantly more solar radiation, which directly increases power generation efficiency. This solution perfectly addresses the needs of single-family homeowners and commercial facilities, for whom maximum power with limited installation space is crucial. The utilized **Half-Cell construction** combined with M10 type cells effectively reduces internal energy losses and significantly improves the module's resistance to spot shading, which can be a challenge in dense urban areas. A key differentiator of the series is also its **excellent performance in low light**, allowing for stable energy production on cloudy days or with a low solar incidence angle. By choosing these modules, investors gain not only elegant aesthetics but, above all, a guarantee of long-term reliability and lower operating costs for the entire system. This technologically advanced solution stands out from market competitors with a significantly better temperature coefficient, which translates into real profits and energy security in the variable Polish climate. ## Notable figures - Efficiency of 21.5% is 0.8pp below the \*\*Back Contact 400-450W\*\* median (22.3%) - Power density of 215.1 W/m² is 7.6 W/m² below \*\*Back Contact 400-450W\*\* median (222.7 W/m²) - needs more roof space - Temperature coefficient of -0.29%/°C matches the \*\*Back Contact 400-450W\*\* median - In the top 57% for efficiency among all Back Contact panels ## Questions ### How does the HPBC technology in the Sunlike Solar SKT420-440M10-108D5 series differ from standard PERC panels? In the SKT420-440M10-108D5 series, all electrical contacts are moved to the rear of the cell, so the front surface has no busbar shading and absorbs more sunlight than conventional PERC cells. An additional benefit is a better temperature coefficient: HPBC loses approximately 0.29% of power per degree Celsius above 25°C, versus 0.40-0.45% for standard PERC. This translates into measurable energy gains on hot summer days. ### What warranty does the Sunlike Solar SKT440M10-108D5 HPBC module come with? The manufacturer provides a 15-year product warranty covering material and workmanship defects, plus a separate 25-year linear power output warranty guaranteeing that the module will continue producing energy above the declared minimum output threshold throughout that period. These are standard premium-tier conditions and should be confirmed in writing by the distributor at the time of purchase. ### Are the SKT420-440M10-108D5 modules bifacial, and can they be installed over a reflective surface to boost yield? No, the SKT420-440M10-108D5 series is a monofacial module. The rear side of the cell is used for electrical contacts in the Back Contact architecture and does not generate additional power from reflected light. If bifacial technology is a priority, you should consider a different product line. The energy advantage of this series comes entirely from improved front-side light absorption enabled by the busbar-free design. ### Will the Sunlike Solar SKT420-440M10-108D5 panels perform well on a Polish rooftop with partial shading from a chimney or dormer window? Yes. The half-cut M10 cell layout splits the module into independent sub-strings, so shading on one section does not shut down the entire panel, and power losses are proportional and far smaller than in full-cell modules. Eliminating front busbars also reduces the risk of localized hot spots, which is especially important for rooftops with architectural obstructions common in Polish residential housing. ### What annual energy yield can I expect from one SKT440M10-108D5 panel in Poland, and how many panels do I need for a 6 kWp system? A single 440 Wp module under Polish irradiation conditions (approximately 1050-1150 kWh/kWp per year) should generate an estimated 460-505 kWh annually. A 6 kWp system requires 14 modules. Exact figures depend on roof orientation, tilt angle, and shading losses, so we recommend verifying the design using dedicated PV simulation software such as PVsyst. ### Does the SKT420-440M10-108D5 HPBC series maintain high efficiency in winter and on overcast days typical of the Polish climate? Yes. Back Contact cell architecture delivers above-average performance under diffuse and low-intensity irradiance. The low temperature coefficient also means fewer losses in summer when rooftops can exceed 60°C. In winter, at sub-zero temperatures under bright cold sunshine, the module may temporarily exceed its rated output. This makes the series well suited to the variable climate of central and northern Poland. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/hpbc-skt420-440m10-108d5-fb-wb-198a339d5d17.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Just Solar JST-EDMH-(445-465)W-TD (465W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-465w-class) | 465 W | +45 W, +2.3 pp, +5 yr warranty | | [Luxor Solar LX-465M/182R-96+ GG](https://comparepv.com/panel/luxor-lx-465m-182r-96-gg) | 465 W | +45 W, +2.3 pp, +5 yr warranty | | [Maxeon SPR-MAX7-470](https://comparepv.com/panel/maxeon-spr-max7-470) | 470 W | +50 W, +2.2 pp, +15 yr warranty | | [AIKO AIKO-A470-MAH54Mb](https://comparepv.com/panel/aiko-aiko-a470-mah54mb) | 470 W | +50 W, +2.1 pp, +5 yr warranty | | [AIKO AIKO-A460-MAH54Mb](https://comparepv.com/panel/aiko-shenzhen-aiko-digital-energy-technology-co-ltd-aiko-a460-mah54mb-1) | 460 W | +40 W, +2.1 pp, +5 yr warranty | | [TCL Zhonghuan HSM-BD54-LA470](https://comparepv.com/panel/tcl-zhonghuan-hsm-bd54-la470) | 470 W | +50 W, +2.1 pp, +5 yr warranty | | [Sunlike Solar LNVB-395M](https://comparepv.com/panel/sunlike-solar-lnvb-395m) | 395 W | -25 W, hotter, -1.3 pp | | [Sunlike Solar LNVB-400M](https://comparepv.com/panel/sunlike-solar-lnvb-400m) | 400 W | -20 W, hotter, -1.0 pp | | [Sunlike Solar LNVB-405M](https://comparepv.com/panel/sunlike-solar-lnvb-405m) | 405 W | -15 W, hotter, -0.8 pp | | [Sunlike Solar SKT410M10-108D4](https://comparepv.com/panel/sunlike-solar-skt410m10-108d4) | 410 W | -10 W, -0.5 pp, +5 yr warranty | | [Sunlike Solar SKT415M10-108D4](https://comparepv.com/panel/sunlike-solar-skt415m10-108d4) | 415 W | +5 yr warranty | | [Sunlike Solar SKT425M10-108D4](https://comparepv.com/panel/sunlike-solar-skt425m10-108d4) | 425 W | +0.3 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +90 W, +3.5 pp, +5 yr warranty | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +75 W, +3.3 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +85 W, +3.2 pp, +5 yr warranty | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +70 W, +3.0 pp, +5 yr warranty | --- Source: https://comparepv.com/panel/sunlike-solar-skt420m10-108d5 Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.