--- title: "Sunova TS-BGT78(640) 640W Solar Panel - Specs & Review | ComparePV" description: "Sunova TS-BGT78(640) 640W solar panel. Specs: 22.90% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/sunova-ts-bgt78-640" updated: 2026-09-11 --- # Sunova TS-BGT78(640) Solid all-round for its segment 359 panels in the segment N-type 600-650 W ## Identity - **Manufacturer:** Sunova - **Model:** TS-BGT78(640) - **Series:** TS-BGT78 - **Rated power:** 640 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 600-650 W (359 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 640 W | 625 W | Strong - top 11% | | | Module efficiency | 22.90% | 22.77% | Typical | 2,359 | | Power density | 229.0 | 227.7 | Typical | 2,380 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 34.0 kg | 32.5 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.90% | 22.77% | Typical | 2,359 | | Power density | 229.0 | 227.7 | Typical | 2,380 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 53.1 | 52.7 | Typical | 6,913 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Commercial, utility-scale and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 640 W - **Efficiency:** 22.90 % - **Voltage at Pmax (Vmp):** 48.18 V - **Current at Pmax (Imp):** 13.28 A - **Open-circuit voltage (Voc):** 56.75 V - **Short-circuit current (Isc):** 13.94 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.280 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 156 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 2464 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 34.0 kg - **Area:** 2.79 m2 - **Power density:** 229.0 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 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:** 559 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 2359 of 14005 | | Power density | 2380 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 6913 of 14005 | | Warranty | 21 of 14005 | ## About this series The Sunova TS-BGT78 series are **bifacial dual-glass modules** engineered for high energy production, even under non-optimal conditions. The use of **N-type monocrystalline cells** helps minimize typical losses found in many standard solutions, while bifacial technology allows for the actual utilization of reflected light off the substrate - particularly effective on light-coloured roofs, membranes, and ground-level structures. In practice, this means more stable system performance and a better energy yield throughout the year, without relying solely on theoretical parameters. The TS-BGT78 stands out from the competition due to its **glass-glass construction**, which enhances environmental resilience and supports long-term reliability. The manufacturer also highlights **excellent low-light performance** and solutions reducing the risk of micro-cracking, thanks to multiple electroluminescence tests. This makes it an excellent choice for commercial and industrial installations, utility-scale PV farms, and projects where the predictability of energy yield and long-term durability are key considerations. ## Notable figures - At 22.9% efficiency, this panel is on par with typical \*\*N-type 600-650W\*\* modules - Power density of 229.1 W/m² matches the \*\*N-type 600-650W\*\* median - At -0.29%/°C, hot weather performance is typical for \*\*N-type 600-650W\*\* panels - At 34.0 kg, this panel is 1.5 kg heavier than the \*\*N-type 600-650W\*\* median (32.5 kg) - more demanding for installation crews - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface ## Questions ### What is the maximum power output of Sunova TS-BGT78 panels? The TS-BGT78 series reaches a maximum power output of up to 640 Wp, placing it among high-power modules designed for commercial, industrial, and utility-scale PV installations. Higher unit power reduces the number of panels needed to reach a target system size, which lowers costs for mounting structures and cabling. ### What is bifacial technology in TS-BGT78 panels and is it worth it? TS-BGT78 panels are bifacial, meaning they generate power from reflected light hitting the rear side of the module as well. This works best on light-colored roofs, white roofing membranes, and ground-mount installations with reflective surfaces such as gravel or snow. The additional rear-side energy gain can range from a few to over ten percent depending on installation conditions. ### What warranty comes with Sunova TS-BGT78 panels? The manufacturer provides a 15-year product warranty and a 30-year linear power output warranty. This offers long-term protection against manufacturing defects as well as gradual power degradation, which is important when calculating the return on investment for commercial installations over several decades. ### How do N-type cells in TS-BGT78 differ from standard P-type cells? The monocrystalline N-type cells used in TS-BGT78 exhibit lower light-induced degradation (LID) compared to more common P-type cells. This results in more stable performance during the first years of operation and better output under low-light conditions, which matters especially in regions with variable annual irradiance. ### Are TS-BGT78 panels suited for roof or ground-mount installations? The glass-glass construction and bifacial design make TS-BGT78 particularly well suited for ground-mount installations and flat roofs with light-colored membranes, where the module can capture reflected light. The manufacturer targets this series mainly at commercial, industrial, and utility-scale PV projects rather than typical residential sloped roofs. ### Does the glass-glass construction of TS-BGT78 improve panel durability? Yes, the dual-glass (glass-glass) design replaces the standard backsheet laminate and improves resistance to moisture, UV exposure, and microcracks in the cells. This construction is commonly used in premium bifacial modules and results in lower long-term power degradation, supported by the manufacturer's 30-year linear power warranty. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/ts-bgt78-615-640-2aa3ad73f585.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +2.3 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +40 W, lighter, +2.3 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +35 W, lighter, +2.1 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +2.1 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +30 W, lighter, +1.9 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +30 W, lighter, +1.9 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +1.9 pp | | [Sunova TS-BW78(575)](https://comparepv.com/panel/sunova-ts-bw78-575) | 575 W | -65 W, lighter, -2.3 pp | | [Sunova TS-BW78(580)](https://comparepv.com/panel/sunova-ts-bw78-580) | 580 W | -60 W, lighter, -2.2 pp | | [Sunova TS-BW78(585)](https://comparepv.com/panel/sunova-ts-bw78-585) | 585 W | -55 W, lighter, -2.0 pp | | [Sunova TS-BW78(590)](https://comparepv.com/panel/sunova-ts-bw78-590) | 590 W | -50 W, lighter, -1.8 pp | | [Sunova TS-BW78(595)](https://comparepv.com/panel/sunova-ts-bw78-595) | 595 W | Lighter, -1.6 pp, -5 yr warranty | | [Sunova TS-BBT78(615)](https://comparepv.com/panel/sunova-ts-bbt78-615) | 615 W | -25 W, lighter, -0.9 pp | | [Sunova TS-BGT78(615)](https://comparepv.com/panel/sunova-ts-bgt78-615) | 615 W | -25 W, -0.9 pp | | [Sunova TS-BBT78(620)](https://comparepv.com/panel/sunova-ts-bbt78-620) | 620 W | -20 W, lighter, -0.7 pp | | [Sunova TS-BGT78(620)](https://comparepv.com/panel/sunova-ts-bgt78-620) | 620 W | -20 W, -0.7 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +60 W, cooler, +2.1 pp | --- Source: https://comparepv.com/panel/sunova-ts-bgt78-640 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.