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S-Energy SL65-78BGJ-590S
S-Energy Brand review

SL65-78BGJ-590S

590 Wp TOPCon Bifacial 500%
ComparePV verdict

Middle of its segment, weak in heat

Rank 6,805 of 14,005
Compare panels Datasheet PDF
Power (Wp)
590
Strong · top 18%
Efficiency (%)
21.10
Weak · bottom 3%
Density (Wp/m²)
211.1
Weak · bottom 3%
Temp (%/°C)
-0.350
Weak · bottom 2%
Weight (kg)
31.0
Typical · median 31.2 kg
Warranty (yrs)
25
Weak · bottom 5%

The S-Energy SL65-78BGJ series is designed for installations where stable energy production is crucial, even under less-than-ideal conditions. These are bifacial modules that can utilize light reaching the back of the panel - this makes it easier to increase energy yield on ground-mounted systems, flat roofs, and structures with light-colored surfaces, without the need to add additional modules. The use of TOPCon technology with N-type cells helps to minimize losses due to degradation and maintain high efficiency over a longer operating period. The glass-glass construction enhances resistance to environmental factors, which is important for installations exposed to wind, humidity, or intense sunlight. The series also features good performance at high temperatures, which translates to more predictable summer performance. This is a sensible choice for commercial investors, PV farms, and demanding prosumers who want to maximize energy yield from available space and minimize the risk of performance degradation over time.

Ranking

1,018 panels in the segment TOPCon 550-600 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.10% 22.44% Weak · bottom 3% 9,297
Power density 211.1 224.4 Weak · bottom 3% 9,292
Temperature coefficient -0.350 -0.290 Weak · bottom 2% 10,419
Weight per kWp 52.5 53.8 Typical 6,152
Performance warranty 25 yrs 30 yrs Weak · bottom 5% 9,798
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 3 caution
Best for

Commercial, utility-scale and residential.

Not ideal for

Hot climates, tight roof space and roofs where every square metre has to count.

Watch-outs
-0.350 %/°C temperature coefficient

Bottom 2% of the TOPCon 550-600 W segment, against a median of -0.290. Ranked 10,419th in the whole database.

21.10% module efficiency

Bottom 3% of the TOPCon 550-600 W segment, against a median of 22.44%. Ranked 9,297th in the whole database.

211.1 watts per square metre

Bottom 3% of the TOPCon 550-600 W segment, against a median of 224.4. Ranked 9,292nd in the whole database.

Notes from the database
  • At 21.1% efficiency, this panel is 1.3pp below the TOPCon 550-600W median of 22.4%
  • Power density of 211.1 W/m² is 13.3 W/m² below TOPCon 550-600W median (224.4 W/m²) - needs more roof space
  • Temperature coefficient of -0.35%/°C is 0.06pp worse than TOPCon 550-600W median (-0.29%/°C) - higher losses in summer heat
  • #9297 for efficiency, #10419 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 590 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.10 % Weak Segment median 22.44%
Vmpp · Impp 45.70 V · 12.90 A Operating point at max power
Voc · Isc 53.90 V · 13.66 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2465×1134×40 mm · 2.80 m² of roof
Weight 31.0 kg Typical Typical · median 31.2 kg
Cells 156 · TOPCon Monocrystalline
Bifaciality 500 % Rear output as a share of front
Coefficient Pmax -0.350 %/°C Weak bottom 2% 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 5% · median 30 yrs
End-of-warranty output 85.0 % Equals 486 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
-
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 -0.290
-
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 SL65-78BGJ-590S 590 W 21.10% -0.350 31.0 kg You are here
LR7-60HVH-560M 560 W 24.80% -0.260 25.0 kg Cooler, lighter, +3.7 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg +50 W, cooler, +3.7 pp
LR7-60HVH-555M 555 W 24.60% -0.260 25.0 kg Cooler, lighter, +3.5 pp
AIKO-A635-MAE72Mw 635 W 24.60% -0.260 27.0 kg Cooler, +3.5 pp, +5 yr warranty
AIKO-A630-MAH72Dw 630 W 24.40% -0.260 32.5 kg Cooler, +3.3 pp, +5 yr warranty
LR7-60HVHL-550M 550 W 24.40% -0.260 16.3 kg Cooler, lighter, +3.3 pp
SE65-78BGJ-575S 575 W 20.50% -0.350 31.0 kg -15 W, -0.6 pp
SL65-78BGJ-580S 580 W 20.70% -0.350 31.0 kg -10 W, -0.4 pp
SL65-78BGJ-585S 585 W 20.90% -0.350 31.0 kg -0.2 pp
SL65-78BGJ-595S 595 W 21.30% -0.350 31.0 kg Very close match
SL65-78BGJ-600S 600 W 21.50% -0.350 31.0 kg +10 W, +0.4 pp
SL65-78TDP-605R 605 W 21.66% -0.300 34.5 kg Cooler, heavier, +5 yr warranty
SL65-78TDP-610R 610 W 21.84% -0.300 34.5 kg Cooler, +0.7 pp, +5 yr warranty
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +90 W, cooler, +4.1 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +85 W, cooler, +3.9 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +110 W, cooler, +3.9 pp

Found 616 panels of the same or similar size to this one, within ±10 mm. See them here Found 616 panels of the same or similar size to this one, within ±25 mm. See them here Found 616 panels of the same or similar size to this one, within ±50 mm. See them here Found 1813 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranty comes with the S-Energy SL65-78BGJ solar panels?
The S-Energy SL65-78BGJ series comes with a 12-year product warranty covering material and manufacturing defects, and a 25-year linear power output warranty. This means the manufacturer guarantees the module will maintain a defined output level for 25 years. Since S-Energy is not a Tier 1 manufacturer, buyers should confirm that warranty service is available through a local distributor or authorized importer before purchasing.
How do TOPCon cells in the SL65-78BGJ compare to standard PERC cells?
The SL65-78BGJ uses N-type TOPCon (Tunnel Oxide Passivated Contact) cells, which deliver lower long-term degradation rates and higher efficiency than conventional P-type PERC cells. In practice, this means less power loss over the system's lifetime and better performance at elevated temperatures. The SL65-78BGJ series achieves efficiency up to 21.5%, a level difficult to reach with standard PERC technology.
Do the bifacial S-Energy SL65-78BGJ panels increase energy yield on flat roofs?
Yes — bifacial performance is one of the primary reasons to choose the SL65-78BGJ for flat-roof and ground-mount installations. The bifacial design captures light reflected off the surface beneath the panel, such as a white TPO membrane, light gravel, or bright ground cover. Depending on the albedo of the surface and tilt angle, bifacial gain typically adds several to over ten percent of additional output without adding more modules.
How does the S-Energy SL65-78BGJ perform during summer heat?
The SL65-78BGJ has a temperature coefficient of Pmax of approximately -0.35%/°C, meaning the panel loses about 0.35% of rated power for every degree Celsius above 25°C. Thanks to the N-type TOPCon architecture, these thermal losses are lower than those seen in typical PERC modules, resulting in more predictable and stable output during hot summer days.
How heavy is the S-Energy SL65-78BGJ panel and will my roof support it?
The SL65-78BGJ module weighs approximately 31 kg with dimensions of 2465×1134×40 mm. This is typical for a 600 Wp glass-glass bifacial module. The glass-glass construction adds durability but also weight compared to glass-backsheet designs. A structural assessment of the roof or racking system is standard practice before installation, especially on older timber-framed roofs. Commercial structures and new carport racking systems generally handle this load without issue.
Is S-Energy a reputable manufacturer and where is the SL65-78BGJ made?
S-Energy is a South Korean solar module manufacturer with years of experience in the PV industry. The company is not currently listed as a Tier 1 manufacturer by Bloomberg NEF, which is worth factoring into long-term warranty risk assessments. The SL65-78BGJ series is actively distributed in European markets. Buyers are advised to verify local warranty service conditions with their distributor and confirm after-sales support availability before committing to a large installation.
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