--- title: "Talesun TM7G78M-625W 625W Solar Panel - Specs & Review | ComparePV" description: "Talesun TM7G78M-625W 625W solar panel. Specs: 22.40% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/talesun-tm7g78m-625w" updated: 2026-09-11 --- # Talesun TM7G78M-625W Middle of its segment, heavy for its output 1,086 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** Talesun - **Model:** TM7G78M-625W - **Series:** TM7G78M (BIPRO) - **Rated power:** 625 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) | 625 W | 620 W | Typical | | | Module efficiency | 22.40% | 22.80% | Weak - bottom 23% | 4,774 | | Power density | 223.6 | 227.7 | Weak - bottom 18% | 4,955 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 35.0 kg | 32.7 kg | Weak - bottom 7% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.40% | 22.80% | Weak - bottom 23% | 4,774 | | Power density | 223.6 | 227.7 | Weak - bottom 18% | 4,955 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 56.0 | 53.1 | Weak - bottom 7% | 10,317 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **56.0 kg per kWp** - Bottom 7% of the TOPCon 600-650 W segment, against a median of 53.1. Ranked 10,317th in the whole database. - **223.6 watts per square metre** - Bottom 18% of the TOPCon 600-650 W segment, against a median of 227.7. - **22.40% module efficiency** - Bottom 23% of the TOPCon 600-650 W segment, against a median of 22.80%. - **Best for:** Commercial, utility-scale and shaded-installations. - **Not ideal for:** Weight-limited structures, roofs where every square metre has to count and tight roof space. ## Specification ### Electrical - **Rated power (Pmax):** 625 W - **Efficiency:** 22.40 % - **Voltage at Pmax (Vmp):** 47.61 V - **Current at Pmax (Imp):** 13.13 A - **Open-circuit voltage (Voc):** 56.18 V - **Short-circuit current (Isc):** 13.79 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:** TOPCon - **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:** 223.6 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:** 546 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 4774 of 14005 | | Power density | 4955 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 10317 of 14005 | | Warranty | 21 of 14005 | ## About this series The Talesun TM7G78M (BIPRO) series was designed to maximize yields where every meter of structure counts - these **bifacial modules** utilize **TOPCon cell technology**, enabling efficient operation even under low irradiance and demanding operational conditions. The application of **heterojunction cells with a 16BB configuration** minimizes internal losses and improves operational stability, translating to more predictable annual energy production. In practice, the TM7G78M (BIPRO) addresses typical challenges in large-scale installations: power drops in hot weather, uneven illumination, and the risk of degradation over the long term. The reinforced construction and **enhanced PID resistance** increase investment safety, while the **IP68 junction box** ensures reliability in high-humidity, dusty, or strong-wind environments. This is a suitable choice for PV farms, ground-mounted installations, carports, and commercial projects, where the additional rear side gain from the module provides an advantage. ## Notable figures - At 22.4% efficiency, this panel is on par with typical \*\*TOPCon 600-650W\*\* modules - At 223.6 W/m², this panel generates 4.1 W/m² less per unit area than \*\*TOPCon 600-650W\*\* median (227.7 W/m²) - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 600-650W\*\* panels - At 35.0 kg (2.3 kg above \*\*TOPCon 600-650W\*\* median of 32.7 kg), requires checking roof load capacity - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof ## Questions ### How much extra energy can the Talesun TM7G78M (BIPRO) bifacial panels generate? Thanks to its bifacial design, the TM7G78M (BIPRO) module captures additional energy from light reflected onto its rear side. Depending on ground albedo (white gravel, light concrete, snow), the extra annual yield can range from a few percent up to the low teens compared to a monofacial panel. The gain is most noticeable in ground-mount installations and carports where the module is elevated above a bright surface. ### How does the TOPCon cell technology in the TM7G78M (BIPRO) differ from older PERC cells? TOPCon (n-type) cells have lower recombination losses and a better temperature coefficient than the previously dominant PERC cells, so they lose less power at high roof or facade temperatures. This translates into higher efficiency (up to about 22.7 percent for this series) and more stable energy output in low-light conditions, such as early morning or overcast days. ### What warranty applies to Talesun TM7G78M (BIPRO) panels - product and power? The TM7G78M (BIPRO) series comes with a 12-year product warranty covering material and workmanship defects, plus a 30-year linear power output warranty. This means the manufacturer guarantees a minimum power retention level over three decades of operation, which is a key factor when calculating ROI for large PV installations. ### Are TM7G78M (BIPRO) panels suitable for large solar farms or ground-mount installations? Yes, this is one of the series' main use cases. With up to 635 Wp per module, a reinforced frame, and enhanced PID resistance, fewer modules are needed and balance-of-system (BoS) costs are reduced across large areas. The bifacial design further improves the economics of solar farms and carports, where panels are mounted above bright, reflective ground surfaces. ### What do half-cut cells with a 16BB layout provide in the TM7G78M (BIPRO)? Splitting cells into halves (half-cut) reduces the current flowing through each cell, lowering resistive losses and limiting power drops caused by partial shading, such as from clouds or dirt. The 16-busbar (16BB) layout improves current collection across the cell surface and increases connection reliability, resulting in more stable energy production over the long term. ### Does the IP68 junction box and PID resistance matter in humid or dusty environments? Yes, this is an important safeguard for installations operating in harsh conditions. The IP68-rated junction box protects electrical connections from moisture, dust, and periodic submersion, reducing the risk of failure and contact corrosion. Enhanced PID (potential-induced degradation) resistance lowers the risk of power loss in hot, humid climates, which matters for large, high-voltage installations. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/bipro-tm7g78m-16bb-20240322-en-2df1b48be6d6.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +2.8 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +50 W, lighter, +2.6 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +2.6 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +45 W, lighter, +2.4 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +45 W, lighter, +2.4 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +2.4 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +45 W, cooler, +2.4 pp | | [Talesun TP7F78M-580W](https://comparepv.com/panel/talesun-tp7f78m-580w) | 580 W | Hotter, -1.7 pp, -5 yr warranty | | [Talesun TP7F78M-585W](https://comparepv.com/panel/talesun-tp7f78m-585w) | 585 W | Hotter, -1.5 pp, -5 yr warranty | | [Talesun TP7F78M-590W](https://comparepv.com/panel/talesun-tp7f78m-590w) | 590 W | Hotter, -1.3 pp, -5 yr warranty | | [Talesun TP7F78M-595W](https://comparepv.com/panel/talesun-tp7f78m-595w) | 595 W | Hotter, -1.1 pp, -5 yr warranty | | [Talesun TP7F78M-600W](https://comparepv.com/panel/talesun-tp7f78m-600w) | 600 W | Hotter, -0.9 pp, -5 yr warranty | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +55 W, lighter, +2.8 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +75 W, cooler, +2.6 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +70 W, cooler, +2.5 pp | --- Source: https://comparepv.com/panel/talesun-tm7g78m-625w 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.