--- title: "S-Energy SL45-72BGI-450S 450W Solar Panel - Specs & Review | ComparePV" description: "S-Energy SL45-72BGI-450S 450W solar panel. Specs: 20.70% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/s-energy-sl45-72bgi-450s" updated: 2026-09-11 --- # S-Energy SL45-72BGI-450S Solid all-round for its segment 449 panels in the segment PERC 450-500 W ## Identity - **Manufacturer:** S-Energy - **Model:** SL45-72BGI-450S - **Series:** SL45-72BGI - **Rated power:** 450 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) | 450 W | 460 W | Weak - bottom 12% | | | Module efficiency | 20.70% | 20.82% | Typical | 10,764 | | Power density | 207.0 | 208.5 | Typical | 10,824 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,419 | | Weight (kg) | 24.6 kg | 24.5 kg | Typical | | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.70% | 20.82% | Typical | 10,764 | | Power density | 207.0 | 208.5 | Typical | 10,824 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,419 | | Weight per kWp | 54.7 | 53.1 | Typical | 9,063 | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | - **Best for:** Residential and commercial. ## Specification ### Electrical - **Rated power (Pmax):** 450 W - **Efficiency:** 20.70 % - **Voltage at Pmax (Vmp):** 41.45 V - **Current at Pmax (Imp):** 10.86 A - **Open-circuit voltage (Voc):** 49.65 V - **Short-circuit current (Isc):** 11.55 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:** PERC - **Cell count:** 144 - **Bifacial:** yes - **Bifacial gain:** 5.00 ### Physical - **Length:** 2094 mm - **Width:** 1038 mm - **Thickness:** 40 mm - **Weight:** 24.6 kg - **Area:** 2.17 m2 - **Power density:** 207.0 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:** 0.64 % - **Output after 30 years:** 357 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 10764 of 14005 | | Power density | 10824 of 14005 | | Temperature coefficient | 10419 of 14005 | | Weight | 9063 of 14005 | | Warranty | 9798 of 14005 | ## About this series The S-Energy SL45-72BGI series is designed as **bifacial** modules that effectively utilize reflected light from the ground to enhance performance where traditional panels reach their limits. The **glass-glass** construction stabilizes the performance of the cells and increases resistance to microcracks, which is important for long-term operation on roofs and in ground-mounted installations. This solution is ideal for investors who want to minimize the risk of performance degradation and maintain predictable energy production over time. In practice, the SL45-72BGI performs particularly well on bright roofs, membranes, gravel, or when mounted on the ground - anywhere where reflected light can benefit you. The modules feature **monocrystalline** cells and are designed for demanding environmental conditions. Their high-quality construction makes them suitable for commercial projects and larger prosumer installations. If you are comparing offers, the key advantage of this series is the combination of **dual-sided generation** with greater structural durability, without compromising the daily performance of the system. ## Notable figures - At 20.7% efficiency, this panel is on par with typical \*\*PERC 450-500W\*\* modules - At 207.0 W/m² power density, roof space requirements are typical for \*\*PERC 450-500W\*\* panels - Temperature coefficient of -0.35%/°C matches the \*\*PERC 450-500W\*\* median - Ranked #10764 out of 14005 panels for efficiency in the database ## Questions ### Is the S-Energy SL45-72BGI series still available for purchase? The S-Energy SL45-72BGI series has been discontinued and is no longer actively stocked by distributors. Isolated units may surface from existing warehouse inventory, but for a new installation or system expansion it is advisable to select a currently manufactured bifacial module to ensure panel availability for future replacements. ### How does bifacial technology work in the S-Energy SL45-72BGI and when does it actually boost energy yield? The SL45-72BGI captures irradiance from both the front and rear side. The rear cell uses light reflected from the ground surface (albedo effect). The practical bifacial gain typically ranges from 5 to 20% additional output and is highest in ground-mount systems over light-colored surfaces, white roofing membranes, or gravel. On dark substrates or flush roof mounts the rear-side contribution is negligible. ### What warranty does S-Energy provide for the SL45-72BGI panels? S-Energy offered a 12-year product warranty covering defects in materials and workmanship, and a 25-year linear power output warranty for the SL45-72BGI series. Because the series is discontinued, buyers of remaining stock should verify whether the manufacturer still honors warranty claims for discontinued product lines before committing to a purchase. ### What is the peak power rating of the S-Energy SL45-72BGI and what system sizes is it suited for? The SL45-72BGI modules are rated at 455 Wp under STC conditions. This output level is typical for commercial installations and larger prosumer systems above 10 kWp. The panels are well suited for ground-mount solar farms and large industrial rooftops, where both the module power and the bifacial yield gain can be fully utilized. ### Does the PERC cell technology in the S-Energy SL45-72BGI improve performance in overcast conditions? The monocrystalline PERC cells used in the SL45-72BGI deliver moderately better efficiency under diffuse irradiance compared to standard mono or polycrystalline cells. In Central European climates this translates to improved yield on cloudy days, though the advantage over more recent technologies such as TOPCon or HJT is less pronounced when PERC is the reference point. ### Is S-Energy a Tier 1 manufacturer and does that affect financing for an installation using SL45-72BGI panels? S-Energy (South Korea) does not appear on the BNEF Tier 1 manufacturer list. For installations financed through loans or leasing agreements this can be relevant, as some lenders and insurers require modules from Tier 1 manufacturers as a contractual condition. It is advisable to confirm this requirement with the financing institution or insurer before purchasing. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/sl45-72bgi-xxxs-230809-1-d9235ca2c4aa.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Cooler, +4.1 pp, +5 yr warranty | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | Cooler, +3.8 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +50 W, cooler, +3.8 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +50 W, cooler, +3.8 pp | | [Gokin GK-3-54HGb-500M](https://comparepv.com/panel/gokin-gk-3-54hgb-500m) | 500 W | +50 W, cooler, +3.8 pp | | [GCL GCL-NR10R/54BGDF](https://comparepv.com/panel/gcl-gcl-nr10r-54bgdf) | 500 W | +50 W, cooler, +3.8 pp | | [S-Energy SL45-72BDI-440Z](https://comparepv.com/panel/s-energy-sl45-72bdi-440z) | 440 W | Heavier, -0.5 pp, +5 yr warranty | | [S-Energy SL45-72BGI-445S](https://comparepv.com/panel/s-energy-sl45-72bgi-445s) | 445 W | Very close match | | [S-Energy SL45-72BGI-455S](https://comparepv.com/panel/s-energy-sl45-72bgi-455s) | 455 W | Very close match | | [Gamko New Energy GKA120N-PRO-590W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-590w) | 590 W | +140 W, +3.1 pp, +5 yr warranty | | [Gamko New Energy GKA120N-PRO-585W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-585w) | 585 W | +135 W, +2.9 pp, +5 yr warranty | | [Bisol BGO 580](https://comparepv.com/panel/bisol-bgo-580) | 580 W | +130 W, cooler, +2.8 pp | | [Gamko New Energy GKA120N-PRO-580W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-580w) | 580 W | +130 W, +2.7 pp, +5 yr warranty | --- Source: https://comparepv.com/panel/s-energy-sl45-72bgi-450s 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.