--- title: "S-Energy SL45-72BDI-440Z 440W Solar Panel - Specs & Review | ComparePV" description: "S-Energy SL45-72BDI-440Z 440W solar panel. Specs: 20.24% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/s-energy-sl45-72bdi-440z" updated: 2026-09-11 --- # S-Energy SL45-72BDI-440Z Warranty pick, heavy for its output 954 panels in the segment PERC 400-450 W ## Identity - **Manufacturer:** S-Energy - **Model:** SL45-72BDI-440Z - **Series:** SL45-72BDI - **Rated power:** 440 W - **Cell technology:** PERC - **Bifacial:** yes ## How it compares Compared against segment PERC 400-450 W (954 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 440 W | 410 W | Strong - top 15% | | | Module efficiency | 20.24% | 20.60% | Weak - bottom 21% | 11,885 | | Power density | 202.4 | 206.2 | Weak - bottom 21% | 11,857 | | Temperature coefficient | -0.360 | -0.350 | Weak - bottom 15% | 12,345 | | Weight (kg) | 26.5 kg | 22.0 kg | Weak - bottom 11% | | | Performance warranty | 30 yrs | 25 yrs | Strong - top 17% | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.24% | 20.60% | Weak - bottom 21% | 11,885 | | Power density | 202.4 | 206.2 | Weak - bottom 21% | 11,857 | | Temperature coefficient | -0.360 | -0.350 | Weak - bottom 15% | 12,345 | | Weight per kWp | 60.2 | 53.0 | Weak - bottom 11% | 12,399 | | Performance warranty | 30 yrs | 25 yrs | Strong - top 17% | 21 | ### Strengths - **30 year performance warranty** - Top 17% of the PERC 400-450 W segment, against a median of 25 yrs. ### Watch out for - **60.2 kg per kWp** - Bottom 11% of the PERC 400-450 W segment, against a median of 53.0. - **-0.360 %/°C temperature coefficient** - Bottom 15% of the PERC 400-450 W segment, against a median of -0.350. - **202.4 watts per square metre** - Bottom 21% of the PERC 400-450 W segment, against a median of 206.2. - **Best for:** Commercial and cold-climate. - **Not ideal for:** Weight-limited structures, hot climates and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 440 W - **Efficiency:** 20.24 % - **Voltage at Pmax (Vmp):** 41.70 V - **Current at Pmax (Imp):** 10.56 A - **Open-circuit voltage (Voc):** 50.10 V - **Short-circuit current (Isc):** 11.44 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.360 %/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:** 144 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 2094 mm - **Width:** 1038 mm - **Thickness:** 30 mm - **Weight:** 26.5 kg - **Area:** 2.17 m2 - **Power density:** 202.4 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:** 374 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 11885 of 14005 | | Power density | 11857 of 14005 | | Temperature coefficient | 12345 of 14005 | | Weight | 12399 of 14005 | | Warranty | 21 of 14005 | ## About this series The S-Energy SL45-72BDI series consists of advanced **bifacial dual-glass** modules that redefine performance standards in harsh environmental conditions. Thanks to the use of double tempered glass instead of a traditional backsheet film, these panels exhibit extreme resistance to the PID phenomenon and degradation caused by moisture or ammonia. The use of **bifacial technology** allows for generating additional energy from reflected radiation, which is crucial for mounting on bright surfaces or in tracking systems. This construction addresses the issue of installation durability in demanding climates, offering a longer lifespan and stability of parameters over time. These modules are primarily dedicated to investors building **utility-scale photovoltaic farms** and commercial rooftop installations, where the priority is maximizing yields per square meter. Compared to standard competition, the SL45-72BDI series stands out with a higher fire resistance class and an optimized temperature coefficient, which translates into real gains on hot days. By choosing these panels, you gain the assurance of **fire safety** and mechanical reliability, making them an ideal solution for projects with a long investment horizon that require uncompromising build quality. ## Notable figures - At 20.2% efficiency, this panel is on par with typical \*\*PERC 400-450W\*\* modules - Power density of 202.4 W/m² is 3.8 W/m² below \*\*PERC 400-450W\*\* median (206.2 W/m²) - needs more roof space - Temperature coefficient of -0.36%/°C matches the \*\*PERC 400-450W\*\* median - Weight of 26.5 kg is 4.5 kg above \*\*PERC 400-450W\*\* median (22.0 kg) - verify structural support - In the top 85% for efficiency among all PERC panels ## Questions ### What warranty comes with the S-Energy SL45-72BDI solar panels and what does it cover? S-Energy provides a 12-year product warranty covering defects in materials and workmanship, and a 30-year linear power output warranty. This means the panel must maintain a specified percentage of its rated 455 Wp output for three decades. The dual-glass construction further extends the module's real-world service life beyond standard industry benchmarks, making this series well-suited for long-payback investment projects. ### Does the bifacial technology in the S-Energy SL45-72BDI actually increase energy yield, and when does it make sense? Yes, the bifacial design of the SL45-72BDI allows modules to generate power from both direct irradiance and light reflected off the ground surface. Typical bifacial gain ranges from 5–15%, depending on surface albedo. The highest gains occur over light-colored surfaces such as gravel, concrete, or snow, and in tracker-mounted systems. On standard dark rooftops, the bifacial benefit is minimal. ### How do S-Energy SL45-72BDI panels perform on hot days — does high temperature significantly reduce output? All crystalline silicon panels lose power as temperature rises. The SL45-72BDI series has a power temperature coefficient of approximately -0.35%/°C. At a typical summer cell temperature of 45°C, this translates to roughly a 7% loss compared to the STC-rated 455 Wp. The optimized temperature coefficient in this series is slightly better than budget competitors, delivering measurably higher output during peak summer hours. ### Are the S-Energy SL45-72BDI panels resistant to moisture and ammonia — suitable for agricultural or biogas installations? Yes. The dual-glass construction eliminates the polymer backsheet, removing the primary moisture ingress path into the cell laminate. The SL45-72BDI series demonstrates confirmed ammonia resistance, which is critical near livestock facilities or biogas plants. Unlike standard monofacial modules, there is no backsheet degradation from volatile chemical exposure over time, making these modules a reliable choice for agri-PV projects. ### What type of installations are the S-Energy SL45-72BDI modules best suited for — ground-mount farms or commercial rooftops? The SL45-72BDI series is designed primarily for utility-scale ground-mount farms and large commercial rooftop installations. The 455 Wp rating, 1500 V system voltage compatibility, and bifacial energy harvest maximize output per square meter at scale. For small residential prosumer systems, a smaller-format module is a better fit — the SL45-72BDI is optimized for industrial and utility-scale projects. ### Is S-Energy a Tier 1 manufacturer and is it a trustworthy choice for a long-term investment? S-Energy is a South Korean manufacturer not classified as Tier 1 by Bloomberg NEF. This does not reflect on product quality — Korean production facilities meet stringent manufacturing standards, and the SL45-72BDI carries IEC certifications with dual-glass durability. For long-term projects, it is advisable to include contractual performance guarantees and consider the manufacturer's financial stability as part of your due diligence. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/bifacial-sl45-72bdi-440-455z-220308-2022-en-ver-1-0-5b775ce18127.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | Cooler, lighter, +4.3 pp | | [Suntech STP-NT11/48QGSF-490](https://comparepv.com/panel/suntech-stp-nt11-48qgsf-490) | 490 W | +50 W, cooler, +4.3 pp | | [JA Solar JAT54S40-485/LR](https://comparepv.com/panel/ja-solar-jat54s40-485-lr) | 485 W | Cooler, lighter, +4.1 pp | | [AIKO AIKO-A485-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a485-mce54mw) | 485 W | Cooler, lighter, +4.1 pp | | [AIKO AIKO-A485-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a485-mah54mw) | 485 W | Cooler, lighter, +4.1 pp | | [Gokin GK-5-54HG-485M](https://comparepv.com/panel/gokin-gk-5-54hg-485m) | 485 W | Cooler, lighter, +4.1 pp | | [Heckert Solar ZEUS 3.0+ 108 485WP](https://comparepv.com/panel/heckert-solar-zeus-3-0-108-485wp) | 485 W | +45 W, cooler, +4.1 pp | | [S-Energy SL45-72BGI-445S](https://comparepv.com/panel/s-energy-sl45-72bgi-445s) | 445 W | Lighter, +0.3 pp, -5 yr warranty | | [S-Energy SL45-72BGI-450S](https://comparepv.com/panel/s-energy-sl45-72bgi-450s) | 450 W | Lighter, +0.5 pp, -5 yr warranty | | [S-Energy SL45-72BGI-455S](https://comparepv.com/panel/s-energy-sl45-72bgi-455s) | 455 W | Lighter, +0.7 pp, -5 yr warranty | | [Gamko New Energy GKA120N-PRO-590W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-590w) | 590 W | +150 W, cooler, +3.6 pp | | [Gamko New Energy GKA120N-PRO-585W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-585w) | 585 W | +145 W, cooler, +3.4 pp | | [Bisol BGO 580](https://comparepv.com/panel/bisol-bgo-580) | 580 W | +140 W, cooler, +3.3 pp | | [Gamko New Energy GKA120N-PRO-580W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-580w) | 580 W | +140 W, cooler, +3.2 pp | --- Source: https://comparepv.com/panel/s-energy-sl45-72bdi-440z 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.