--- title: "S-Energy SL65-66BDJ-490Z 490W Solar Panel - Specs & Review | ComparePV" description: "S-Energy SL65-66BDJ-490Z 490W solar panel. Specs: 20.64% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/s-energy-sl65-66bdj-490z" updated: 2026-09-11 --- # S-Energy SL65-66BDJ-490Z Warranty pick, heavy for its output 449 panels in the segment PERC 450-500 W ## Identity - **Manufacturer:** S-Energy - **Model:** SL65-66BDJ-490Z - **Series:** SL65-66BDJ - **Rated power:** 490 W - **Cell technology:** PERC - **Bifacial:** yes ## How it compares Compared against segment PERC 450-500 W (449 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 490 W | 460 W | Strong - top 15% | | | Module efficiency | 20.64% | 20.82% | Typical | 11,037 | | Power density | 206.4 | 208.5 | Typical | 11,027 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,419 | | Weight (kg) | 29.0 kg | 24.5 kg | Weak - bottom 12% | | | Performance warranty | 30 yrs | 25 yrs | Strong - top 20% | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.64% | 20.82% | Typical | 11,037 | | Power density | 206.4 | 208.5 | Typical | 11,027 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,419 | | Weight per kWp | 59.2 | 53.1 | Weak - bottom 12% | 12,043 | | Performance warranty | 30 yrs | 25 yrs | Strong - top 20% | 21 | ### Strengths - **30 year performance warranty** - Top 20% of the PERC 450-500 W segment, against a median of 25 yrs. ### Watch out for - **59.2 kg per kWp** - Bottom 12% of the PERC 450-500 W segment, against a median of 53.1. - **Best for:** Owners who value a long output guarantee. - **Not ideal for:** Weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 490 W - **Efficiency:** 20.64 % - **Voltage at Pmax (Vmp):** 37.80 V - **Current at Pmax (Imp):** 12.97 A - **Open-circuit voltage (Voc):** 45.40 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:** -0.290 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 44 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 66 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 2094 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 29.0 kg - **Area:** 2.37 m2 - **Power density:** 206.4 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 85.0 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.45 % - **Output after 30 years:** 416 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 11037 of 14005 | | Power density | 11027 of 14005 | | Temperature coefficient | 10419 of 14005 | | Weight | 12043 of 14005 | | Warranty | 21 of 14005 | ## About this series 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. ## Notable figures - Efficiency of 20.6% matches the \*\*PERC 450-500W\*\* median - Power density of 206.3 W/m² matches the \*\*PERC 450-500W\*\* median - Temperature coefficient of -0.35%/°C matches the \*\*PERC 450-500W\*\* median - At 29.0 kg, this panel is 4.5 kg heavier than the \*\*PERC 450-500W\*\* median (24.5 kg) - more demanding for installation crews - Bifacial design (70% factor) captures reflected light - adds 4-10% yield on ground-mount or white roof ## Questions ### 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. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/bifacial-sl65-66bdj-480-505z-220412-2022-en-ver-1-0-2fcd74195995.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, lighter, +4.4 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Cooler, lighter, +4.2 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, lighter, +4.1 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | Cooler, lighter, +3.9 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | Cooler, lighter, +3.9 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | Cooler, lighter, +3.9 pp | | [S-Energy SL65-66BDJ-480Z](https://comparepv.com/panel/s-energy-sl65-66bdj-480z) | 480 W | -10 W, -0.4 pp | | [S-Energy SL65-66MAJ-480Z](https://comparepv.com/panel/s-energy-sl65-66maj-480z) | 480 W | Lighter, -0.5 pp, -5 yr warranty | | [S-Energy SL65-66BDJ-485Z](https://comparepv.com/panel/s-energy-sl65-66bdj-485z) | 485 W | -0.2 pp | | [S-Energy SL65-66MAJ-485Z](https://comparepv.com/panel/s-energy-sl65-66maj-485z) | 485 W | Lighter, -0.3 pp, -5 yr warranty | | [S-Energy SL65-66BAJ-490S](https://comparepv.com/panel/s-energy-sl65-66baj-490s) | 490 W | Lighter, -5 yr warranty | | [S-Energy SL65-66MAJ-490Z](https://comparepv.com/panel/s-energy-sl65-66maj-490z) | 490 W | Lighter, -5 yr warranty | | [S-Energy SL65-66BAJ-495S](https://comparepv.com/panel/s-energy-sl65-66baj-495s) | 495 W | Lighter, +0.3 pp, -5 yr warranty | | [S-Energy SL65-66BDJ-495Z](https://comparepv.com/panel/s-energy-sl65-66bdj-495z) | 495 W | +0.2 pp | | [S-Energy SL65-66MAJ-495Z](https://comparepv.com/panel/s-energy-sl65-66maj-495z) | 495 W | Lighter, -5 yr warranty | | [Gamko New Energy GKA120N-PRO-590W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-590w) | 590 W | +100 W, cooler, +3.2 pp | --- Source: https://comparepv.com/panel/s-energy-sl65-66bdj-490z 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.