--- title: "S-Energy SL65-78BGJ-600S 600W Solar Panel - Specs & Review | ComparePV" description: "S-Energy SL65-78BGJ-600S 600W solar panel. Specs: 21.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/s-energy-sl65-78bgj-600s" updated: 2026-09-11 --- # S-Energy SL65-78BGJ-600S Middle of its segment, weak in heat 1,086 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** S-Energy - **Model:** SL65-78BGJ-600S - **Series:** SL65-78BGJ - **Rated power:** 600 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 600-650 W (1086 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 600 W | 620 W | Weak - bottom 5% | | | Module efficiency | 21.50% | 22.80% | Weak - bottom 1% | 7,958 | | Power density | 214.6 | 227.7 | Weak - bottom 1% | 8,200 | | Temperature coefficient | -0.350 | -0.290 | Weak - bottom 1% | 10,419 | | Weight (kg) | 31.0 kg | 32.7 kg | Typical | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 3% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.50% | 22.80% | Weak - bottom 1% | 7,958 | | Power density | 214.6 | 227.7 | Weak - bottom 1% | 8,200 | | Temperature coefficient | -0.350 | -0.290 | Weak - bottom 1% | 10,419 | | Weight per kWp | 51.7 | 53.1 | Typical | 5,025 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 3% | 9,798 | ### Watch out for - **-0.350 %/°C temperature coefficient** - Bottom 1% of the TOPCon 600-650 W segment, against a median of -0.290. Ranked 10,419th in the whole database. - **214.6 watts per square metre** - Bottom 1% of the TOPCon 600-650 W segment, against a median of 227.7. Ranked 8,200th in the whole database. - **21.50% module efficiency** - Bottom 1% of the TOPCon 600-650 W segment, against a median of 22.80%. Ranked 7,958th in the whole database. - **Best for:** Commercial, utility-scale and residential. - **Not ideal for:** Hot climates, roofs where every square metre has to count and tight roof space. ## Specification ### Electrical - **Rated power (Pmax):** 600 W - **Efficiency:** 21.50 % - **Voltage at Pmax (Vmp):** 46.30 V - **Current at Pmax (Imp):** 12.96 A - **Open-circuit voltage (Voc):** 54.30 V - **Short-circuit current (Isc):** 13.72 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.350 %/degC - **Temperature coefficient of Voc:** -0.270 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 156 - **Bifacial:** yes - **Bifacial gain:** 5.00 ### Physical - **Length:** 2465 mm - **Width:** 1134 mm - **Thickness:** 40 mm - **Weight:** 31.0 kg - **Area:** 2.80 m2 - **Power density:** 214.6 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 85.0 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.54 % - **Output after 30 years:** 494 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 7958 of 14005 | | Power density | 8200 of 14005 | | Temperature coefficient | 10419 of 14005 | | Weight | 5025 of 14005 | | Warranty | 9798 of 14005 | ## About this series 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. ## Notable figures - At 21.5% efficiency, this panel is 1.3pp below the \*\*TOPCon 600-650W\*\* median of 22.8% - 214.7 W/m² power density is 13.0 W/m² below \*\*TOPCon 600-650W\*\* median (227.7 W/m²) - requires larger installation area - -0.35%/°C temperature coefficient - 0.06pp worse than \*\*TOPCon 600-650W\*\* median (-0.29%/°C), expect higher hot weather losses - 31.0 kg weight - 1.7 kg lighter than \*\*TOPCon 600-650W\*\* median (32.7 kg), reducing installation effort - In the top 57% for efficiency among all TOPCon panels ## Questions ### 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. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/sl65-78bgj-xxxs-230809-1-3485e8872353.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +50 W, cooler, +3.7 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, +3.5 pp, +5 yr warranty | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, lighter, +3.3 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, +3.3 pp, +5 yr warranty | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | Cooler, lighter, +3.1 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | Cooler, +3.1 pp, +5 yr warranty | | [S-Energy SE65-78BGJ-575S](https://comparepv.com/panel/s-energy-se65-78bgj-575s) | 575 W | -25 W, -1.0 pp | | [S-Energy SL65-78BGJ-580S](https://comparepv.com/panel/s-energy-sl65-78bgj-580s) | 580 W | -20 W, -0.8 pp | | [S-Energy SL65-78BGJ-585S](https://comparepv.com/panel/s-energy-sl65-78bgj-585s) | 585 W | -15 W, -0.6 pp | | [S-Energy SL65-78BGJ-590S](https://comparepv.com/panel/s-energy-sl65-78bgj-590s) | 590 W | -10 W, -0.4 pp | | [S-Energy SL65-78BGJ-595S](https://comparepv.com/panel/s-energy-sl65-78bgj-595s) | 595 W | Very close match | | [S-Energy SL65-78TDP-605R](https://comparepv.com/panel/s-energy-sl65-78tdp-605r) | 605 W | Cooler, heavier, +5 yr warranty | | [S-Energy SL65-78TDP-610R](https://comparepv.com/panel/s-energy-sl65-78tdp-610r) | 610 W | Cooler, heavier, +5 yr warranty | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +80 W, cooler, +3.7 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +75 W, cooler, +3.5 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +100 W, cooler, +3.5 pp | --- Source: https://comparepv.com/panel/s-energy-sl65-78bgj-600s Not in this file, on the page: a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.