--- title: "Talesun TM7G78M/650W 650W Solar Panel - Specs & Review | ComparePV" description: "Talesun TM7G78M/650W 650W solar panel. Specs: 23.30% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/talesun-tm7g78m-650w" updated: 2026-09-11 --- # Talesun TM7G78M/650W Solid all-round for its segment 109 panels in the segment N-type 650-700 W ## Identity - **Manufacturer:** Talesun - **Model:** TM7G78M/650W - **Series:** BIPRO TM7G78M - **Rated power:** 650 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 650-700 W (109 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 650 W | 660 W | Weak - bottom 12% | | | Module efficiency | 23.30% | 23.30% | Typical | 1,017 | | Power density | 232.5 | 233.2 | Typical | 1,222 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 35.0 kg | 33.5 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.30% | 23.30% | Typical | 1,017 | | Power density | 232.5 | 233.2 | Typical | 1,222 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 53.8 | 50.9 | Typical | 7,897 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Utility-scale, commercial, shaded-installations and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 650 W - **Efficiency:** 23.30 % - **Voltage at Pmax (Vmp):** 48.53 V - **Current at Pmax (Imp):** 13.40 A - **Open-circuit voltage (Voc):** 57.10 V - **Short-circuit current (Isc):** 14.04 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.240 %/degC - **Temperature coefficient of Isc:** 0.043 %/degC - **NOCT:** 43 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 156 - **Bifacial:** yes ### Physical - **Length:** 2465 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 35.0 kg - **Area:** 2.80 m2 - **Power density:** 232.5 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 1017 of 14005 | | Power density | 1222 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 7897 of 14005 | | Warranty | 21 of 14005 | ## About this series The Talesun BIPRO TM7G78M series features advanced bifacial modules that set new standards in the performance of large-scale photovoltaic farms. Thanks to the use of **bifacial technology** and half-cut cells, these panels allow for the recovery of energy reflected from the ground, which significantly increases the total annual yield. The use of **10-busbar (10BB) technology** effectively minimizes transmission losses and reduces the risk of micro-cracks, translating into stable system operation for decades. The robust glass-glass construction solves the problem of rapid module degradation in harsh weather conditions, providing exceptional resistance to the PID phenomenon and high mechanical loads. This is an ideal solution for investors seeking to **maximize return on investment (ROI)** by realistically lowering the levelized cost of energy (LCOE). Unlike standard monofacial panels, the TM7G78M series performs excellently in locations with a high light reflection coefficient, such as light gravel or sandy surfaces. It is primarily dedicated to **professional commercial installations and solar farms**, where every additional watt of power obtained from the ground surface counts. Choosing this series guarantees **higher resistance to high operating temperatures**, making it an unrivaled solution for demanding large-scale projects. ## Notable figures - At 23.3% efficiency, this panel is on par with typical \*\*N-type 650-700W\*\* modules - Power density of 232.5 W/m² matches the \*\*N-type 650-700W\*\* median - Temperature coefficient of -0.29%/°C matches the \*\*N-type 650-700W\*\* median - At 35.0 kg, this panel is 1.5 kg heavier than the \*\*N-type 650-700W\*\* median (33.5 kg) - more demanding for installation crews - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface ## Questions ### How does the bifacial technology in Talesun BIPRO TM7G78M panels differ from standard monofacial modules? BIPRO TM7G78M panels use bifacial cells that generate power from both the front and rear side of the module. This allows them to capture light reflected off the ground, such as from bright gravel or sandy surfaces. In practice, this results in additional annual energy yield of up to several percent compared to classic monofacial panels on the same installation area. ### What is the maximum power output of the TM7G78M module and which installations is it suited for? Panels in the TM7G78M series reach up to 660 Wp, making them among the higher-power large-format modules on the market. Due to their high output and bifacial design, they are dedicated primarily to professional commercial installations and ground-mounted solar farms, where maximizing power per square meter of land matters most rather than typical residential rooftop mounts. ### What warranty applies to Talesun BIPRO TM7G78M panels? The manufacturer provides a 12-year product warranty and a 30-year linear power output warranty. This means the module maintains a guaranteed, gradually declining performance level as specified in the datasheet for three decades, an important factor when calculating long-term ROI for large-scale farm projects. ### What does N-type cell technology and the 10BB busbar design mean for these panels? N-type cells feature lower degradation over time and better performance at high operating temperatures compared to older P-type cells. The 10-busbar (10BB) design means ten thin conductive paths on the cell surface, which reduces electrical resistance, lowers transmission losses, and minimizes the risk of microcracks, increasing module durability under varying conditions. ### Does the glass-glass construction in TM7G78M handle moisture and PID degradation better than standard glass-backsheet panels? Yes, the glass-glass encapsulation, where cells are sandwiched between two glass panes instead of a backsheet, provides significantly better sealing against moisture ingress. As a result, TM7G78M panels resist potential-induced degradation (PID) more effectively and maintain mechanical stability even under heavy snow or wind loads, extending the system's practical service life. ### Is Talesun a Tier 1 manufacturer, and can it be trusted for a large investment? Yes, Talesun holds Tier 1 manufacturer status, indicating stable financial standing, extensive production experience, and module bankability recognized by financing institutions for renewable energy projects. The company is headquartered in China and exports panels worldwide. Tier 1 status is a key factor in financing large solar farms, as banks and investors are more willing to lend against equipment from proven suppliers. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/640-660-BIPRO_TM7G78M_16BB_Silver_12_20250515_EN-1-f5b52ddde176.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +1.9 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +30 W, lighter, +1.9 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, lighter, +1.7 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +1.7 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +50 W, cooler, +1.7 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +45 W, cooler, +1.6 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +1.5 pp | | [Talesun TP7F78M-580W](https://comparepv.com/panel/talesun-tp7f78m-580w) | 580 W | -70 W, hotter, -2.6 pp | | [Talesun TP7F78M-585W](https://comparepv.com/panel/talesun-tp7f78m-585w) | 585 W | -65 W, hotter, -2.4 pp | | [Talesun TP7F78M-590W](https://comparepv.com/panel/talesun-tp7f78m-590w) | 590 W | -60 W, hotter, -2.2 pp | | [Talesun TP7F78M-595W](https://comparepv.com/panel/talesun-tp7f78m-595w) | 595 W | -55 W, hotter, -2.0 pp | | [Talesun TP7F78M-600W](https://comparepv.com/panel/talesun-tp7f78m-600w) | 600 W | -50 W, hotter, -1.8 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | Cooler, lighter, +1.5 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | Cooler, lighter, +1.5 pp | --- Source: https://comparepv.com/panel/talesun-tm7g78m-650w 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.