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S-Energy Brand review

SL65-66MAJ-490Z

490 Wp PERC
ComparePV verdict

Middle of its segment, needs the roof space

Rank 10,454 of 14,005
Compare panels Datasheet PDF
Power (Wp)
490
Strong · top 15%
Efficiency (%)
20.58
Weak · bottom 21%
Density (Wp/m²)
205.8
Weak · bottom 21%
Temp (%/°C)
-0.350
Typical · median -0.350
Weight (kg)
27.0
Typical · median 24.5 kg
Warranty (yrs)
25
Typical · median 25 yrs

The S-Energy SL65-66MAJ series is designed for installations where stable performance under varying conditions - from full sun to partial shading - is crucial. The use of monocrystalline cells in a half-cut configuration minimizes losses due to heating and improves performance when the roof is intermittently shaded by chimneys, skylights, or trees. The modules utilize a 132-cell architecture, which translates to a better distribution of current loads and greater resistance to micro-cracks during transport and installation.

In practice, the SL65-66MAJ addresses a common problem for investors in Poland - decreased production in hot weather and uneven performance of strings under partial shading - thanks to its favorable temperature characteristics and well-thought-out electrical design. It is a good choice for single-family homes, businesses, and larger roofs where quick project completion and predictable performance over many years are important. An additional advantage is its conservative power tolerance and carefully considered safety features (including a sealed connection box), which facilitate long-term operation.

Ranking

449 panels in the segment PERC 450-500 W
Metric This panel Median Position in segment Overall rank
Module efficiency 20.58% 20.82% Weak · bottom 21% 11,181
Power density 205.8 208.5 Weak · bottom 21% 11,146
Temperature coefficient -0.350 -0.350 Typical 10,419
Weight per kWp 55.1 53.1 Typical 9,526
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 · 2 caution
Best for

Residential, commercial and shaded-installations.

Not ideal for

Roofs where every square metre has to count and tight roof space.

Watch-outs
205.8 watts per square metre

Bottom 21% of the PERC 450-500 W segment, against a median of 208.5.

20.58% module efficiency

Bottom 21% of the PERC 450-500 W segment, against a median of 20.82%.

Notes from the database
  • Efficiency of 20.6% matches the PERC 450-500W median
  • Power density of 205.8 W/m² matches the PERC 450-500W median
  • At -0.35%/°C, hot weather performance is typical for PERC 450-500W panels
  • At 27.0 kg (2.5 kg above PERC 450-500W median of 24.5 kg), requires checking roof load capacity
  • Ranked #11181 out of 14005 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 490 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 20.58 % Weak Segment median 20.82%
Vmpp · Impp 37.70 V · 13.00 A Operating point at max power
Voc · Isc 45.30 V · 13.72 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2100×1134×35 mm · 2.38 m² of roof
Weight 27.0 kg Typical Typical · median 24.5 kg
Cells 66 · PERC Monocrystalline
Coefficient Pmax -0.350 %/°C Typical median -0.350 of its segment
Coefficient Voc · Isc -0.290 · 0.050 %/°C
NOCT 44 °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 84.8 % Equals 402 W guaranteed
Degradation 2.00 → 0.55 % 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
-0.350 %/°C against a segment median of -0.350
-

Alternatives

All S-Energy panels
Filter these
Size
Panel Power Eff. Temp. Weight Difference
S-Energy SL65-66MAJ-490Z 490 W 20.58% -0.350 27.0 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg Cooler, +4.4 pp, +5 yr warranty
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg Cooler, lighter, +4.2 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg Cooler, +4.1 pp, +5 yr warranty
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg Cooler, lighter, +3.9 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg Cooler, +3.9 pp, +5 yr warranty
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg Cooler, lighter, +3.9 pp
SL65-66BDJ-480Z 480 W 20.21% -0.350 29.0 kg Heavier, -0.4 pp, +5 yr warranty
SL65-66MAJ-480Z 480 W 20.16% -0.350 27.0 kg -10 W, -0.4 pp
SL65-66BDJ-485Z 485 W 20.42% -0.350 29.0 kg Heavier, +5 yr warranty
SL65-66MAJ-485Z 485 W 20.37% -0.350 27.0 kg -0.2 pp
SL65-66BAJ-490S 490 W 20.70% -0.350 26.5 kg Very close match
SL65-66BDJ-490Z 490 W 20.64% -0.350 29.0 kg Heavier, +5 yr warranty
SL65-66BAJ-495S 495 W 20.90% -0.350 26.5 kg +0.3 pp
SL65-66BDJ-495Z 495 W 20.85% -0.350 29.0 kg Heavier, +0.3 pp, +5 yr warranty
SL65-66MAJ-495Z 495 W 20.79% -0.350 27.0 kg +0.2 pp
GKA120N-PRO-590W 590 W 23.82% -0.300 26.7 kg +100 W, +3.2 pp, +5 yr warranty

Found 394 panels of the same or similar size to this one, within ±10 mm. See them here Found 402 panels of the same or similar size to this one, within ±25 mm. See them here Found 430 panels of the same or similar size to this one, within ±50 mm. See them here Found 885 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranty does the S-Energy SL65-66MAJ series come with?
The SL65-66MAJ series carries a 12-year product warranty covering material and workmanship defects. S-Energy also provides a 25-year linear power output warranty, guaranteeing that modules retain at least 80% of their rated power after that period. This is standard coverage for panels in this category. Before signing a contract, verify that the local distributor offers after-sales support in your country.
Does the half-cut PERC technology in the SL65-66MAJ actually improve performance under shading?
Yes. Half-cut cells are split in half, so a shadow covering part of the module blocks a smaller share of its output than in conventional full-cell panels. The 132-cell layout in the SL65-66MAJ limits losses from shading caused by chimneys, dormers, or trees, resulting in measurably higher annual energy yield, especially on roofs with complex geometry.
How do the S-Energy SL65-66MAJ panels perform in hot weather?
The power temperature coefficient is approximately -0.35%/°C, meaning the modules lose slightly less output during extreme heat compared to older full-cell designs. This favorable temperature characteristic translates into better production on summer afternoons in Central Europe, when module surface temperatures can exceed 65°C.
How many S-Energy SL65-66MAJ panels are needed for a 10 kWp system?
At 505 Wp per module, a 10 kWp system requires approximately 20 panels. For a typical single-family home consuming 4-6 MWh per year, 10-14 modules (5-7 kWp) are usually sufficient. The exact count is determined by a designer after analyzing actual electricity consumption and available roof area.
Who manufactures S-Energy panels and are they a reputable brand?
S-Energy is a South Korean solar panel manufacturer founded in 2001, originating from Samsung's photovoltaic division, with its own production facilities in South Korea. According to available data, the company is not currently listed as a Bloomberg NEF Tier 1 manufacturer, though its modules meet IEC standards and have been present on European markets for years. Confirm warranty support terms with the local distributor before purchasing.
Are the SL65-66MAJ modules compatible with popular inverters available on the market?
Yes. The SL65-66MAJ series meets electrical standards enabling compatibility with inverters from leading brands such as SMA, Fronius, Huawei, and Growatt, supporting system voltages up to 1000 or 1500 V DC. Before purchasing, have your installer verify that the inverter's MPPT input ranges match the current and voltage parameters of this series.
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