--- title: "Talesun TD7G78M-590W 590W Solar Panel - Specs & Review | ComparePV" description: "Talesun TD7G78M-590W 590W solar panel. Specs: 21.10% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/talesun-td7g78m-590w" updated: 2026-09-11 --- # Talesun TD7G78M-590W Warranty pick, heavy for its output 589 panels in the segment PERC 550-600 W ## Identity - **Manufacturer:** Talesun - **Model:** TD7G78M-590W - **Series:** TD7G78M (BIPRO) - **Rated power:** 590 W - **Cell technology:** PERC - **Bifacial:** yes ## How it compares Compared against segment PERC 550-600 W (589 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 590 W | 560 W | Strong - top 17% | | | Module efficiency | 21.10% | 21.29% | Typical | 9,297 | | Power density | 211.1 | 212.9 | Typical | 9,292 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,419 | | Weight (kg) | 35.0 kg | 30.8 kg | Weak - bottom 12% | | | Performance warranty | 30 yrs | 27 yrs | Strong - top 25% | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.10% | 21.29% | Typical | 9,297 | | Power density | 211.1 | 212.9 | Typical | 9,292 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,419 | | Weight per kWp | 59.3 | 52.7 | Weak - bottom 12% | 12,099 | | Performance warranty | 30 yrs | 27 yrs | Strong - top 25% | 21 | ### Strengths - **30 year performance warranty** - Top 25% of the PERC 550-600 W segment, against a median of 27 yrs. ### Watch out for - **59.3 kg per kWp** - Bottom 12% of the PERC 550-600 W segment, against a median of 52.7. - **Best for:** Commercial, utility-scale and shaded-installations. - **Not ideal for:** Weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 590 W - **Efficiency:** 21.10 % - **Voltage at Pmax (Vmp):** 45.25 V - **Current at Pmax (Imp):** 13.04 A - **Open-circuit voltage (Voc):** 53.87 V - **Short-circuit current (Isc):** 13.93 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.350 %/degC - **Temperature coefficient of Voc:** -0.260 %/degC - **Temperature coefficient of Isc:** 0.048 %/degC - **NOCT:** 43 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **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:** 211.1 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:** 501 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 9297 of 14005 | | Power density | 9292 of 14005 | | Temperature coefficient | 10419 of 14005 | | Weight | 12099 of 14005 | | Warranty | 21 of 14005 | ## About this series The Talesun TD7G78M (BIPRO) series comprises bifacial glass-glass modules designed for stable energy production even in non-ideal roof or ground conditions. The application of bifacial **PERC technology** enables the utilization of reflected radiation from the substrate, translating to a real energy yield gain compared to monofacial panels. Thanks to **10BB and half-cut design**, the module performs better against micro-cracking and resistive losses, and demonstrates stable operation even with partial shading. The series employs **waffle diffused galley**, which limits power degradation over time and facilitates predictable long-term energy production. Investors calculating LCOE and seeking to mitigate revenue underestimation will particularly value this feature. An additional advantage is **enhanced resistance to PID** and a sealed connector box with IP68 rating, making this series an excellent choice for utility-scale PV farms, commercial installations, and projects in humid, windy, or dusty environments. ## Notable figures - At 21.1% efficiency, this panel is on par with typical \*\*PERC 550-600W\*\* modules - Power density of 211.1 W/m² matches the \*\*PERC 550-600W\*\* median - At -0.35%/°C, hot weather performance is typical for \*\*PERC 550-600W\*\* panels - Weight of 35.0 kg is 4.2 kg above \*\*PERC 550-600W\*\* median (30.8 kg) - verify structural support - 70% bifaciality enables rear-side power generation, boosting yield by 4-10% on reflective surfaces ## Questions ### Is the Talesun TD7G78M (BIPRO) series still available for purchase? No, production of the TD7G78M (BIPRO) series has ended and the model has been discontinued from Talesun's current lineup. Panels from this series may still be found through distributors clearing remaining stock, but availability is limited. When planning to expand an existing installation, check with a supplier for stock levels and mechanical compatibility with pallets or containers of modules you already own. ### What does bifacial technology add to the TD7G78M panels, and does it actually increase energy yield? Bifacial PERC cells let the rear side of the module capture light reflected off the ground, a light-colored roof, or snow cover. With proper mounting height and a bright surface below, the extra yield typically ranges from a few to over ten percent compared to a monofacial panel. Best results are achieved on ground-mount arrays, flat roofs with east-west layouts, or trackers, where the rear side has unobstructed access to reflected light. ### What warranty comes with the Talesun TD7G78M panels and what does it cover? The TD7G78M series is backed by a 12-year product warranty covering material and workmanship defects, plus a 30-year linear power warranty guaranteeing a minimum output level over that period. This is a standard offering from tier 1 manufacturers and gives investors confidence when calculating returns over a 25-30 year horizon. ### How does the half-cut, 10BB design in the TD7G78M differ from standard panels, and how does it perform under partial shading? Half-cut cells combined with 10 busbars reduce resistive losses and split current load across smaller module segments. As a result, under partial shading from a chimney, antenna, or fallen leaf, the overall power drop is smaller than in a conventional full-cell design. The technology also lowers the risk of microcracks forming during transport and installation. ### What installations are TD7G78M panels best suited for - residential, utility-scale PV farms, or commercial projects? Thanks to the glass-glass construction, enhanced PID resistance, and sealed IP68 junction box, this series performs particularly well in large PV farms, commercial installations, and projects located in humid, windy, or dusty environments. The bifacial design also favors ground-mount or flat-roof installations, where the rear side gains access to reflected light, maximizing return on investment. ### Do the gallium-doped wafers in the TD7G78M actually reduce power degradation over time? Yes, gallium doping instead of traditional boron doping reduces light-induced degradation (LID) in the module's early hours and years of operation. In practice, this results in a more predictable power decline curve consistent with the declared 30-year linear warranty, helping investors calculate LCOE more accurately and reducing the risk of underestimating annual energy yields. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/12603048336303126a22a5c-1cc1b8e8dd08.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, lighter, +3.7 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +3.7 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | Cooler, lighter, +3.5 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | Cooler, lighter, +3.5 pp | | [AIKO AIKO-A630-MAH72Dw](https://comparepv.com/panel/aiko-aiko-a630-mah72dw) | 630 W | +40 W, cooler, +3.3 pp | | [Longi Solar LR7-60HVHL-550M](https://comparepv.com/panel/longi-lr7-60hvhl-550m) | 550 W | Cooler, 19 kg lighter, +3.3 pp | | [Talesun TP7F78M-580W](https://comparepv.com/panel/talesun-tp7f78m-580w) | 580 W | Lighter, -0.4 pp, -5 yr warranty | | [Talesun TP7F78M-585W](https://comparepv.com/panel/talesun-tp7f78m-585w) | 585 W | Lighter, -0.2 pp, -5 yr warranty | | [Talesun TP7F78M-595W](https://comparepv.com/panel/talesun-tp7f78m-595w) | 595 W | Lighter, -5 yr warranty | | [Talesun TP7F78M-600W](https://comparepv.com/panel/talesun-tp7f78m-600w) | 600 W | Lighter, +0.4 pp, -5 yr warranty | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +90 W, cooler, +4.1 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +85 W, cooler, +3.9 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +110 W, cooler, +3.9 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +105 W, cooler, +3.8 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +80 W, cooler, +3.7 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +80 W, cooler, +3.7 pp | --- Source: https://comparepv.com/panel/talesun-td7g78m-590w 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.