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S-Energy Brand review

SL65-66BDJ-505Z

505 Wp PERC Bifacial 70%
ComparePV verdict

Space saver, no clear weak spot

Rank 8,706 of 14,005
Compare panels Datasheet PDF
Power (Wp)
505
Weak · bottom 11%
Efficiency (%)
21.27
Strong · top 7%
Density (Wp/m²)
212.7
Strong · top 6%
Temp (%/°C)
-0.350
Typical · median -0.350
Weight (kg)
29.0
Typical · median 28.4 kg
Warranty (yrs)
30
Typical · median 30 yrs

S-Energy SL65-66BDJ photovoltaic panels are advanced bifacial double glass modules that redefine performance standards in demanding environmental conditions. Thanks to the use of a double glass layer, this design demonstrates extreme resistance to PID degradation and destructive atmospheric factors, which directly translates to the extended lifespan of the entire power plant. The use of bifacial technology allows for efficient energy generation not only from direct radiation but also from light reflected from the ground, which is crucial in projects with a high albedo coefficient. This series solves the problem of power drops resulting from component aging, offering investors exceptional yield stability over a multi-year operation perspective. These modules are dedicated primarily to professional photovoltaic farms and large commercial installations, where the priority is optimization of the LCOE cost. They stand out from the competition with rigorous Korean quality control and an increased fire resistance class, making them a safe solution for facilities with strict safety standards. It is an ideal choice for entities focusing on maximizing system profitability through the intelligent use of the rear cell surface and a reinforced mechanical structure.

Ranking

706 panels in the segment PERC 500-550 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.27% 20.90% Strong · top 7% 8,849
Power density 212.7 209.0 Strong · top 6% 8,757
Temperature coefficient -0.350 -0.350 Typical 10,419
Weight per kWp 57.4 53.0 Typical 11,209
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

2 positive · 0 caution
Best for

Roofs where every square metre counts and small roofs that need every watt.

Strengths
212.7 watts per square metre

Top 6% of the PERC 500-550 W segment, against a median of 209.0. Ranked 8,757th in the whole database.

21.27% module efficiency

Top 7% of the PERC 500-550 W segment, against a median of 20.90%. Ranked 8,849th in the whole database.

Notes from the database
  • Efficiency of 21.3% matches the PERC 500-550W median
  • 212.7 W/m² power density - 3.7 W/m² more than PERC 500-550W median (209.0 W/m²), more power per roof area
  • At -0.35%/°C, hot weather performance is typical for PERC 500-550W panels
  • Bifacial design (70% factor) captures reflected light - adds 4-10% yield on ground-mount or white roof
  • Ranked #8849 out of 14005 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 505 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.27 % Strong Segment median 20.90%
Vmpp · Impp 38.40 V · 13.16 A Operating point at max power
Voc · Isc 46.00 V · 13.90 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2094×1134×30 mm · 2.37 m² of roof
Weight 29.0 kg Typical Typical · median 28.4 kg
Cells 66 · PERC Monocrystalline
Bifaciality 70 % Rear output as a share of front
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 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 85.0 % Equals 429 W guaranteed
Degradation 2.00 → 0.45 % 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
-
With bifacial gain
-

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
-
Bifacial gain
Rear gain over light concrete: -
-

Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.

Alternatives

All S-Energy panels
Filter these
Size
Panel Power Eff. Temp. Weight Difference
S-Energy SL65-66BDJ-505Z 505 W 21.27% -0.350 29.0 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg Cooler, lighter, +3.7 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg Cooler, lighter, +3.5 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg Cooler, lighter, +3.4 pp
LR7-60HVH-555M 555 W 24.60% -0.260 25.0 kg +50 W, cooler, +3.3 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg Cooler, lighter, +3.2 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg Cooler, lighter, +3.2 pp
SL65-66BDJ-480Z 480 W 20.21% -0.350 29.0 kg -25 W, -1.1 pp
SL65-66MAJ-480Z 480 W 20.16% -0.350 27.0 kg -25 W, -1.1 pp, -5 yr warranty
SL65-66BDJ-485Z 485 W 20.42% -0.350 29.0 kg -20 W, -0.8 pp
SL65-66MAJ-485Z 485 W 20.37% -0.350 27.0 kg -20 W, -0.9 pp, -5 yr warranty
SL65-66BAJ-490S 490 W 20.70% -0.350 26.5 kg Lighter, -0.6 pp, -5 yr warranty
SL65-66BDJ-490Z 490 W 20.64% -0.350 29.0 kg -15 W, -0.6 pp
SL65-66MAJ-490Z 490 W 20.58% -0.350 27.0 kg Lighter, -0.7 pp, -5 yr warranty
SL65-66BAJ-495S 495 W 20.90% -0.350 26.5 kg Lighter, -0.4 pp, -5 yr warranty
SL65-66BDJ-495Z 495 W 20.85% -0.350 29.0 kg -10 W, -0.4 pp
SL65-66MAJ-495Z 495 W 20.79% -0.350 27.0 kg Lighter, -0.5 pp, -5 yr warranty
GKA120N-PRO-590W 590 W 23.82% -0.300 26.7 kg +85 W, cooler, +2.6 pp

Found 397 panels of the same or similar size to this one, within ±10 mm. See them here Found 408 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 953 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 SL65-66BDJ panels and what does it cover?
The S-Energy SL65-66BDJ series comes with a 12-year product warranty covering manufacturing defects and a 30-year linear power output warranty. The power warranty guarantees that after 30 years of operation the panel will retain at least the manufacturer's specified percentage of its rated power. This is one of the longer power warranty packages available on the market, making the series particularly attractive for long-term energy investors.
Are S-Energy SL65-66BDJ panels a good fit for ground-mounted solar farms with gravel or light-colored surfaces?
Yes, the SL65-66BDJ is a bifacial module designed specifically for installations where the rear cell surface can capture light reflected from the ground. High-albedo surfaces such as gravel, concrete, snow, or sand can realistically increase energy yield by several to over ten percent compared to a standard monofacial panel, making bifacial technology a key advantage in utility-scale and ground-mount projects.
What does double glass technology mean in the SL65-66BDJ series and how does it affect durability?
Double glass means the panel uses a second layer of tempered glass instead of a conventional polymer backsheet. This provides extreme resistance to PID degradation, moisture ingress, and mechanical stress that gradually degrades standard modules. The glass-glass structure extends system lifetime and supports the manufacturer's 30-year power warranty. It is especially valuable in high-humidity environments or locations with large thermal cycling amplitudes.
Is S-Energy a Tier 1 manufacturer and is it safe to invest in these panels?
S-Energy is an established South Korean PV manufacturer but is not currently listed as Tier 1 by Bloomberg NEF. This means project financing through bank loans or leasing may require additional due diligence. Nevertheless, the company applies the rigorous quality control standards characteristic of the Korean PV industry, and the SL65-66BDJ series stands out with an enhanced fire resistance rating and a robust mechanical structure.
What is the peak power of the S-Energy SL65-66BDJ and which installations is it designed for?
The S-Energy SL65-66BDJ achieves a peak power of 505 Wp. The series is primarily intended for utility-scale solar farms and large commercial installations where optimizing LCOE is the main priority. PERC cell technology combined with a bifacial design and double glass construction allows the module to generate more energy per unit of area compared to standard monofacial panels.
Are S-Energy SL65-66BDJ panels fire-resistant and suitable for buildings with strict safety requirements?
Yes, the SL65-66BDJ series features an enhanced fire resistance rating, a direct benefit of the double glass construction that eliminates the flammable polymer backsheet. This makes the modules a suitable choice for facilities subject to strict fire safety regulations, such as industrial warehouses, logistics centers, or rooftop installations on public buildings where fire class compliance is mandatory.
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