--- title: "S-Energy SL65-78TDP-615R 615W Solar Panel - Specs & Review | ComparePV" description: "S-Energy SL65-78TDP-615R 615W solar panel. Specs: 22.02% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/s-energy-sl65-78tdp-615r" updated: 2026-09-11 --- # S-Energy SL65-78TDP-615R Middle of its segment, heavy for its output 1,086 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** S-Energy - **Model:** SL65-78TDP-615R - **Series:** SL65-78TDP - **Rated power:** 615 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) | 615 W | 620 W | Typical | | | Module efficiency | 22.02% | 22.80% | Weak - bottom 8% | 6,329 | | Power density | 220.2 | 227.7 | Weak - bottom 7% | 6,477 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 19% | 6,093 | | Weight (kg) | 34.5 kg | 32.7 kg | Weak - bottom 6% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.02% | 22.80% | Weak - bottom 8% | 6,329 | | Power density | 220.2 | 227.7 | Weak - bottom 7% | 6,477 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 19% | 6,093 | | Weight per kWp | 56.1 | 53.1 | Weak - bottom 6% | 10,381 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **56.1 kg per kWp** - Bottom 6% of the TOPCon 600-650 W segment, against a median of 53.1. Ranked 10,381st in the whole database. - **220.2 watts per square metre** - Bottom 7% of the TOPCon 600-650 W segment, against a median of 227.7. Ranked 6,477th in the whole database. - **22.02% module efficiency** - Bottom 8% of the TOPCon 600-650 W segment, against a median of 22.80%. Ranked 6,329th in the whole database. - **Best for:** Utility-scale, commercial and hot-climate. - **Not ideal for:** Weight-limited structures, roofs where every square metre has to count and tight roof space. ## Specification ### Electrical - **Rated power (Pmax):** 615 W - **Efficiency:** 22.02 % - **Voltage at Pmax (Vmp):** 42.48 V - **Current at Pmax (Imp):** 13.30 A - **Open-circuit voltage (Voc):** 55.10 V - **Short-circuit current (Isc):** 14.10 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.300 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.045 %/degC - **NOCT:** 42 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 78 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 2465 mm - **Width:** 1133 mm - **Thickness:** 30 mm - **Weight:** 34.5 kg - **Area:** 2.79 m2 - **Power density:** 220.2 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 538 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 6329 of 14005 | | Power density | 6477 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 10381 of 14005 | | Warranty | 21 of 14005 | ## About this series The S-Energy SL65-78TDP solar panel series is an advanced solution designed for maximum efficiency in demanding industrial installations and large-scale solar farms. The cell technology used in them allows for stable energy yields even under lower sunlight conditions, which is crucial in variable climates. These modules stand out with **high resistance to the PID effect**, which guarantees long-term protection against power degradation and full investment stability for decades. Thanks to a reinforced frame construction, this series offers **above-average mechanical strength** against snow and strong wind loads, effectively eliminating the risk of micro-cracks in harsh weather conditions. It is an ideal choice for investors seeking components with an **excellent price-to-quality ratio**, which perform best where reliability and low unit cost of produced energy are what matters most. Unlike many standard market solutions, S-Energy SL65-78TDP is characterized by **optimized operation at high temperatures**, which significantly minimizes transmission losses on the hottest days of the year. This is a solid foundation for demanding commercial projects, providing a predictable return on investment thanks to precise craftsmanship and rigorous quality tests conducted at every production stage. The applied **multi-busbar technology** additionally improves electron flow, increasing the overall module efficiency and ensuring its longevity. ## Notable figures - At 22.0% efficiency, this panel is 0.8pp below the \*\*TOPCon 600-650W\*\* median of 22.8% - Power density of 220.2 W/m² is 7.5 W/m² below \*\*TOPCon 600-650W\*\* median (227.7 W/m²) - needs more roof space - At -0.30%/°C, hot weather performance is typical for \*\*TOPCon 600-650W\*\* panels - Weight of 34.5 kg is 1.8 kg above \*\*TOPCon 600-650W\*\* median (32.7 kg) - verify structural support - Bifaciality factor of 70% can add 4-10% extra yield with reflective mounting surface ## Questions ### What cell technology does the S-Energy SL65-78TDP series use and why does it matter? The SL65-78TDP series is built on TOPCon (Tunnel Oxide Passivated Contact) technology combined with a bifacial design. The passivating tunnel oxide layer minimizes carrier recombination, pushing module efficiency to approximately 22.4%. In practice this means a lower temperature coefficient of Pmax (-0.30%/°C) and higher energy yields both under full irradiance and in diffuse light conditions common in Central European climates. ### What warranty does the S-Energy SL65-78TDP solar panel come with? S-Energy provides a 12-year product warranty covering material and workmanship defects, plus a 30-year linear power warranty guaranteeing at least 87.4% of rated power after three decades. For investors this translates into predictable energy yields and a stable return on investment over the full financing horizon, which is especially critical in utility-scale projects where bankability depends on long-term performance guarantees. ### Is the S-Energy SL65-78TDP a bifacial panel and how much extra energy can I expect? Yes, the SL65-78TDP series features a bifacial design that captures irradiance from both the front and rear surfaces. The rear glass collects diffuse and ground-reflected light, delivering a 5–15% bifacial gain depending on the ground albedo — white roofing membrane, light gravel, or snow coverage produce the highest gains. Ground-mounted utility farms with elevated racking systems benefit the most from this effect. ### Are the S-Energy SL65-78TDP 625 W panels suitable for large-scale solar farms? Yes, this series was engineered for industrial and utility-scale applications. At 625 Wp per module, fewer panels, cables, and mounting points are needed to reach a target farm capacity, directly reducing BoS costs and improving LCOE. Strong PID resistance, a reinforced frame rated for high snow and wind loads, and a 30-year linear power warranty make this series an attractive choice for project developers seeking long-term bankability. ### How do the S-Energy SL65-78TDP panels perform during summer heat? The TOPCon cell architecture delivers a temperature coefficient of Pmax of -0.30%/°C, meaning the panel loses only 3% of its rated output for every 10°C rise in cell temperature. Standard PERC modules typically rate at -0.35%/°C, so the SL65-78TDP holds a clear advantage on the hottest days of the year. The practical result is higher daily energy production during peak summer, which directly improves the seasonal economics of a solar farm. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/datasheet-sl65-78tdp-xxxr-605-625-231120-2023-en-ver-1-0-0054a1a939b3.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +3.2 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +3.0 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +2.8 pp | | [Longi Solar LR8-66HVD-665M](https://comparepv.com/panel/longi-lr8-66hvd-665m) | 665 W | +50 W, cooler, +2.6 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (665W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-665w-class) | 665 W | +50 W, cooler, +2.6 pp | | [Huayao HY665-B144DSS](https://comparepv.com/panel/huayao-hy665-b144dss) | 665 W | +50 W, lighter, +2.6 pp | | [Sunpro Power SPDG665-BC132R12](https://comparepv.com/panel/sunpro-spdg665-bc132r12) | 665 W | +50 W, cooler, +2.6 pp | | [S-Energy SE65-78BGJ-575S](https://comparepv.com/panel/s-energy-se65-78bgj-575s) | 575 W | Hotter, -1.5 pp, -5 yr warranty | | [S-Energy SL65-78BGJ-580S](https://comparepv.com/panel/s-energy-sl65-78bgj-580s) | 580 W | Hotter, -1.3 pp, -5 yr warranty | | [S-Energy SL65-78BGJ-585S](https://comparepv.com/panel/s-energy-sl65-78bgj-585s) | 585 W | Hotter, -1.1 pp, -5 yr warranty | | [S-Energy SL65-78BGJ-590S](https://comparepv.com/panel/s-energy-sl65-78bgj-590s) | 590 W | Hotter, -0.9 pp, -5 yr warranty | | [S-Energy SL65-78BGJ-595S](https://comparepv.com/panel/s-energy-sl65-78bgj-595s) | 595 W | Hotter, -0.7 pp, -5 yr warranty | | [S-Energy SL65-78BGJ-600S](https://comparepv.com/panel/s-energy-sl65-78bgj-600s) | 600 W | Hotter, lighter, -5 yr warranty | | [S-Energy SL65-78TDP-605R](https://comparepv.com/panel/s-energy-sl65-78tdp-605r) | 605 W | -10 W, -0.4 pp | | [S-Energy SL65-78TDP-610R](https://comparepv.com/panel/s-energy-sl65-78tdp-610r) | 610 W | Very close match | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +65 W, lighter, +3.2 pp | --- Source: https://comparepv.com/panel/s-energy-sl65-78tdp-615r Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.