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S-Energy Brand review

SL65-66BAJ-500S

500 Wp PERC
ComparePV verdict

Efficiency leader, short guarantee

Rank 9,863 of 14,005
Compare panels Datasheet PDF
Power (Wp)
500
Weak · bottom 4%
Efficiency (%)
21.10
Strong · top 20%
Density (Wp/m²)
211.0
Strong · top 23%
Temp (%/°C)
-0.350
Typical · median -0.350
Weight (kg)
26.5
Typical · median 28.4 kg
Warranty (yrs)
25
Weak · bottom 23%

The S-Energy SL65-66BAJ series is designed to maximize energy output on a limited surface area - without compromising reliability. These are monocrystalline modules in a 132 half-cut cell configuration, which are better suited to partial shading and minimize losses due to panel heating during operation. In practice, this means more stable production in typical Polish rooftop conditions - with chimneys, skylights, or installations spread across multiple roof sections.

Another key feature of this series is its refined design, featuring tempered glass with an anti-reflective coating, which supports more effective light utilization on cloudy days and at low angles. The entire system is also completed by a high-sealing connection (IP68), which is important for long-term operation in humid, snowy, and dusty conditions.

The SL65-66BAJ is a good choice for residential and commercial installations where predictable performance, weather resistance, and high-quality construction are important - features often found in premium segments.

Ranking

706 panels in the segment PERC 500-550 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.10% 20.90% Strong · top 20% 9,297
Power density 211.0 209.0 Strong · top 23% 9,398
Temperature coefficient -0.350 -0.350 Typical 10,419
Weight per kWp 53.0 53.0 Typical 6,725
Performance warranty 25 yrs 30 yrs Weak · bottom 23% 9,798
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

2 positive · 1 caution
Best for

Residential, commercial and shaded-installations.

Not ideal for

Owners who want a long output guarantee.

Strengths
21.10% module efficiency

Top 20% of the PERC 500-550 W segment, against a median of 20.90%.

211.0 watts per square metre

Top 23% of the PERC 500-550 W segment, against a median of 209.0.

Watch-outs
25 year performance warranty

Bottom 23% of the PERC 500-550 W segment, against a median of 30 yrs.

Notes from the database
  • Efficiency of 21.1% matches the PERC 500-550W median
  • Power density of 211.0 W/m² matches the PERC 500-550W median
  • At -0.35%/°C, hot weather performance is typical for PERC 500-550W panels
  • 26.5 kg weight - 1.9 kg lighter than PERC 500-550W median (28.4 kg), reducing installation effort
  • #9297 for efficiency, #10419 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 500 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.10 % Strong Segment median 20.90%
Vmpp · Impp 38.30 V · 13.06 A Operating point at max power
Voc · Isc 45.50 V · 13.90 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2090×1134×35 mm · 2.37 m² of roof
Weight 26.5 kg Typical Typical · median 28.4 kg
Cells 132 · PERC Monocrystalline
Coefficient Pmax -0.350 %/°C Typical median -0.350 of its segment
Coefficient Voc · Isc -0.270 · 0.040 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 25 years Weak bottom 23% · median 30 yrs
End-of-warranty output 85.0 % Equals 412 W guaranteed
Degradation 2.00 → 0.54 % 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 SL65-66BAJ-500S 500 W 21.10% -0.350 26.5 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg Cooler, +3.9 pp, +5 yr warranty
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg Cooler, lighter, +3.7 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg Cooler, +3.6 pp, +5 yr warranty
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg Cooler, lighter, +3.4 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg Cooler, +3.4 pp, +5 yr warranty
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg Cooler, lighter, +3.4 pp
SL65-66BDJ-480Z 480 W 20.21% -0.350 29.0 kg Heavier, -0.9 pp, +5 yr warranty
SL65-66MAJ-480Z 480 W 20.16% -0.350 27.0 kg -20 W, -0.9 pp
SL65-66BDJ-485Z 485 W 20.42% -0.350 29.0 kg Heavier, -0.7 pp, +5 yr warranty
SL65-66MAJ-485Z 485 W 20.37% -0.350 27.0 kg -15 W, -0.7 pp
SL65-66BAJ-490S 490 W 20.70% -0.350 26.5 kg -10 W, -0.4 pp
SL65-66BDJ-490Z 490 W 20.64% -0.350 29.0 kg Heavier, -0.5 pp, +5 yr warranty
SL65-66MAJ-490Z 490 W 20.58% -0.350 27.0 kg -10 W, -0.5 pp
SL65-66BAJ-495S 495 W 20.90% -0.350 26.5 kg -0.2 pp
SL65-66BDJ-495Z 495 W 20.85% -0.350 29.0 kg Heavier, -0.2 pp, +5 yr warranty
SL65-66MAJ-495Z 495 W 20.79% -0.350 27.0 kg -0.3 pp
LR7-60HVH-560M 560 W 24.80% -0.260 25.0 kg +60 W, cooler, +3.7 pp

Found 392 panels of the same or similar size to this one, within ±10 mm. See them here Found 409 panels of the same or similar size to this one, within ±25 mm. See them here Found 425 panels of the same or similar size to this one, within ±50 mm. See them here Found 965 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What is the warranty on S-Energy SL65-66BAJ solar panels?
The SL65-66BAJ series comes with a 12-year product warranty and a 25-year linear power output warranty. After 25 years of operation, the panel is guaranteed to retain at least 85% of its rated power. This is a standard premium-tier warranty level and provides a solid basis for long-term return-on-investment calculations.
Are S-Energy SL65-66BAJ panels a good fit for roofs with chimneys or dormers?
Yes, the SL65-66BAJ series is particularly well-suited for such installations. The 132-cell half-cut layout means partial shading from a chimney, dormer, or antenna affects only a fraction of the module, keeping energy losses significantly lower than on conventional full-cell panels. The manufacturer explicitly designed this series for the shading conditions typical of Polish residential rooftops.
What is the peak power output of the SL65-66BAJ series and how many panels do I need for a home system?
The top model in this series delivers 500 Wp of peak power. A typical residential system rated at 6–10 kW requires between 12 and 20 panels. The high per-module output means fewer panels and less roof area are needed to reach a given system size compared to older 350–400 Wp modules.
Does the PERC cell technology in the SL65-66BAJ make a difference under Poland's often overcast skies?
Yes. The monocrystalline PERC cells used in the SL65-66BAJ respond better to diffuse and low-intensity light than older standard cells. Combined with tempered glass and an anti-reflective coating, the panel captures more energy from low-angle sunlight and overcast conditions, resulting in a higher annual energy yield in a temperate climate.
How do S-Energy SL65-66BAJ panels perform in high summer temperatures?
The power temperature coefficient for this series is -0.35% per degree Celsius above 25°C. On a hot day when the panel surface reaches 65°C, output drops by roughly 14% relative to STC-rated power. The half-cut cell architecture further reduces thermal losses by splitting each cell into two independent halves, lowering internal resistance and improving performance under real-world high-temperature conditions.
Is S-Energy a Tier 1 manufacturer and can I trust them for a long-term installation?
S-Energy is a South Korean manufacturer with extensive industry experience, but it is not currently listed as a Tier 1 supplier by Bloomberg NEF. This does not indicate poor quality — many reliable brands outside that list deliver premium-grade products. Before purchasing, it is worth verifying the manufacturer's current financial stability and the availability of warranty service in your country, since honoring a 25-year power guarantee depends on the company remaining in operation.
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