Skip to main content
Sunlike Solar Brand review

SKT420M10-108D5

420 Wp Back Contact
ComparePV verdict

Middle of its segment, modest efficiency

Rank 10,787 of 14,005
Compare panels Datasheet PDF
Power (Wp)
420
Weak · bottom 16%
Efficiency (%)
21.50
Weak · bottom 9%
Density (Wp/m²)
215.1
Weak · bottom 9%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
20.8
Weak · bottom 24%
Warranty (yrs)
25
Typical · median 25 yrs

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.

Ranking

52 panels in the segment Back Contact 400-450 W
Metric This panel Median Position in segment Overall 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
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 3 caution
Not ideal for

Tight roof space, roofs where every square metre has to count and weight-limited structures.

Watch-outs
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.

Notes from the database
  • 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

Specifications

Open datasheet PDF
Nominal power (Pmax) 420 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.50 % Weak Segment median 22.30%
Vmpp · Impp 32.44 V · 12.95 A Operating point at max power
Voc · Isc 38.73 V · 14.00 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1722×1134×30 mm · 1.95 m² of roof
Weight 20.8 kg Weak Weak · bottom 24%
Cells 108 · Back Contact Monocrystalline
Coefficient Pmax -0.290 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.230 · 0.050 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 15 years Hardware defects only
Performance warranty 25 years Typical median 25 yrs · median 25 yrs
End-of-warranty output 88.9 % Equals 365 W guaranteed
Degradation 1.00 → 0.42 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by Sunlike Solar in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 420 Wp appear here. The rest cover the whole series.

Current-Voltage (I-V) Curves Current-Voltage (I-V) Curves Whole series Power-Voltage (P-V) Curves Power-Voltage (P-V) Curves 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
-0.290 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Sunlike Solar SKT420M10-108D5 420 W 21.50% -0.290 20.8 kg You are here
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg +45 W, +2.3 pp, +5 yr warranty
LX-465M/182R-96+ GG 465 W 23.80% -0.260 23.5 kg +45 W, +2.3 pp, +5 yr warranty
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg +50 W, +2.2 pp, +15 yr warranty
AIKO-A470-MAH54Mb 470 W 23.60% -0.260 21.5 kg +50 W, +2.1 pp, +5 yr warranty
AIKO-A460-MAH54Mb 460 W 23.60% -0.290 20.5 kg +40 W, +2.1 pp, +5 yr warranty
HSM-BD54-LA470 470 W 23.60% -0.260 21.5 kg +50 W, +2.1 pp, +5 yr warranty
LNVB-395M 395 W 20.23% -0.360 21.0 kg -25 W, hotter, -1.3 pp
LNVB-400M 400 W 20.48% -0.360 21.0 kg -20 W, hotter, -1.0 pp
LNVB-405M 405 W 20.74% -0.360 21.0 kg -15 W, hotter, -0.8 pp
SKT410M10-108D4 410 W 21.00% -0.290 21.0 kg -10 W, -0.5 pp, +5 yr warranty
SKT415M10-108D4 415 W 21.30% -0.290 21.0 kg +5 yr warranty
SKT425M10-108D4 425 W 21.80% -0.290 21.0 kg +0.3 pp, +5 yr warranty
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +90 W, +3.5 pp, +5 yr warranty
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +75 W, +3.3 pp, +5 yr warranty
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +85 W, +3.2 pp, +5 yr warranty
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +70 W, +3.0 pp, +5 yr warranty

Found 1783 panels of the same or similar size to this one, within ±10 mm. See them here Found 1914 panels of the same or similar size to this one, within ±25 mm. See them here Found 3392 panels of the same or similar size to this one, within ±50 mm. See them here Found 3970 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
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.
Add to compare