--- title: "Q-Cells Q.TRON XL-G2.3 / BFG 640 640W Solar Panel - Specs & Review | ComparePV" description: "Q-Cells Q.TRON XL-G2.3 / BFG 640 640W solar panel. Specs: 22.90% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/q-cells-q-tron-xl-g2-3-bfg-640" updated: 2026-09-11 --- # Q-Cells Q.TRON XL-G2.3 / BFG 640 Middle of its segment, heavy for its output 359 panels in the segment N-type 600-650 W ## Identity - **Manufacturer:** Q-Cells - **Model:** Q.TRON XL-G2.3 / BFG 640 - **Series:** Q.TRON XL-G2 SERIES - **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 | 229.2 | 227.7 | Typical | 2,368 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 35.4 kg | 32.5 kg | Weak - bottom 17% | | | 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 | 229.2 | 227.7 | Typical | 2,368 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 55.3 | 52.7 | Weak - bottom 17% | 9,773 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **55.3 kg per kWp** - Bottom 17% of the N-type 600-650 W segment, against a median of 52.7. - **Best for:** Commercial and utility-scale. - **Not ideal for:** Weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 640 W - **Efficiency:** 22.90 % - **Voltage at Pmax (Vmp):** 48.28 V - **Current at Pmax (Imp):** 13.26 A - **Open-circuit voltage (Voc):** 57.79 V - **Short-circuit current (Isc):** 13.99 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:** 0.040 %/degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 156 - **Bifacial:** yes - **Bifacial gain:** 21.00 ### Physical - **Length:** 2462 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 35.4 kg - **Area:** 2.79 m2 - **Power density:** 229.2 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 88.9 % - **First-year degradation:** 1.50 % - **Annual degradation:** 0.33 % - **Output after 30 years:** 569 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 2359 of 14005 | | Power density | 2368 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 9773 of 14005 | | Warranty | 21 of 14005 | ## Pros - **N-type TOPCon cells (Q.ANTUM NEO)** - N-type technology avoids the LID/LeTID degradation issues typical of older P-type PERC cells and performs better under low-irradiance and high-temperature conditions, translating into a real annual yield uplift versus PERC modules. - **Strong 30-year power warranty** - The manufacturer guarantees at least 98.5% of nominal power in year one with max. 0.33% annual degradation thereafter, yielding roughly 88.93% power retention at year 30 - stronger than the typical 25-year linear warranty with ~84% retention offered by many p-type competitors. - **Bifacial double-glass construction** - The module captures light reflected off the ground (albedo), boosting energy yield from the same footprint at no added land cost - a key advantage for utility-scale and C&I projects optimizing LCOE over a 25-30 year horizon. - **Tier-1, bankable manufacturer (BNEF)** - Q-Cells (Hanwha Q Cells, founded 1999) is listed on BloombergNEF's Tier-1 list, easing project financing through banks and institutional lenders - an important factor for large-scale C&I and utility installations. - **High per-module power up to 645 Wp** - Power output up to 645 Wp at efficiency up to 23.1% reduces module count, cabling, and BOS costs for a given system size - on par with the best peer comparables (Runergy HY-DH156N8 at 645 Wp/23.1%). ## Cons - **Shorter product warranty (12 years)** - The product (materials/workmanship) warranty is 12 years, while some tier-1 competitors offer 15-25 years of independent material defect coverage on top of the power warranty - worth factoring into service-risk planning for projects with a 25+ year horizon. ## About this series Q-CELLS Q.TRON XL-G2 SERIES are modules designed for maximum yield from every square meter of installation-especially where the cost of energy over the long term is crucial. The series utilises **N-type TOPCon (Q.ANTUM NEO) cells**, resulting in excellent performance in real-world conditions, including low irradiance and temperature fluctuations. A key advantage is the **bifacial double-glass construction**-the module effectively utilises reflected light from the ground, enhancing yield without expanding the farm area. In practice, the Q.TRON XL-G2 helps address typical design challenges: reduced BOS and cabling thanks to the high power of a single module, better production predictability, and lower risk of performance degradation over time. A critical element is the **durability suite** (including protection against PID, LeTID, and hot-spot), as well as the **robust frame for various mounting systems**, facilitating integration on trackers and ground structures. This is the choice for C&I and PV farm installations where stable yield and low LCOE are priorities, rather than compromises common in many standard P-type modules. ## Notable figures - At 22.9% efficiency, this panel is on par with typical \*\*N-type 600-650W\*\* modules - At 229.2 W/m² power density, roof space requirements are typical for \*\*N-type 600-650W\*\* panels - At -0.29%/°C, hot weather performance is typical for \*\*N-type 600-650W\*\* panels - Weight of 35.4 kg is 2.9 kg above \*\*N-type 600-650W\*\* median (32.5 kg) - verify structural support - Ranked #2359 out of 14005 panels for efficiency in the database ## Questions ### What warranties come with the Q-Cells Q.TRON XL-G2 series? Q-Cells backs the Q.TRON XL-G2 with a 12-year product warranty and a 30-year linear power warranty. In year one, the module retains at least 98.5% of rated output, with a maximum annual degradation rate of 0.33%. After 30 years, warranted output is no less than 88.93% of nominal power — one of the strongest long-term performance guarantees among commercial-grade bifacial modules currently available. ### How much additional energy yield can the bifacial Q.TRON XL-G2 deliver? The Q.TRON XL-G2 achieves a bifaciality factor of 80% (±5%), enabling up to 21% additional energy yield compared to a monofacial module of the same rated power under optimal conditions. Real-world gains depend on ground albedo (light gravel or snow cover significantly boost rear-side irradiance), tilt angle, and module clearance height — parameters typically optimized in ground-mount and tracker system designs. ### Is the Q.TRON XL-G2 suitable for single-axis tracker installations? Yes. The Q.TRON XL-G2 is engineered for utility-scale and C&I ground-mount applications, including single-axis trackers. Its reinforced aluminum frame is compatible with standard tracker mounting systems, and the double-glass construction provides the mechanical stiffness required under dynamic loading. Module dimensions are 2462×1134×35 mm with a weight of approximately 35.4 kg — key parameters for tracker bearing specification. ### How does N-type TOPCon technology in the Q.TRON XL-G2 differ from standard p-type PERC cells? The Q.ANTUM NEO N-type TOPCon cells used in the Q.TRON XL-G2 offer significantly lower susceptibility to LeTID and PID degradation compared to standard p-type PERC, along with superior low-light response and better high-temperature performance. This translates to higher annual energy yield per kWp installed and a more predictable degradation curve across the full 30-year warranty period, directly reducing LCOE for long-horizon C&I and utility-scale projects. ### How does the Q.TRON XL-G2 perform in cold winter conditions? The Q.TRON XL-G2 is rated for operating temperatures from −40°C to +85°C, ensuring full functionality through harsh Central European winters. N-type TOPCon technology exhibits a lower temperature coefficient than p-type PERC cells, minimizing power losses at low temperatures. The double-glass construction also provides robust resistance to snow loads and thermal cycling without requiring any special cold-climate precautions. ### What type of installations is the Q.TRON XL-G2 series best suited for, and is it still available? The Q.TRON XL-G2 series is designed for commercial and industrial (C&I) installations and utility-scale PV farms where low LCOE and stable long-term yield are the top priorities. At up to 635 Wp per module, it reduces BoS costs and wiring complexity per MW installed. The series remains active and is currently available — it has not been discontinued. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/b8e89e94a79c2d101377c7bc.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 | | [Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 580](https://comparepv.com/panel/q-cells-q-peak-duo-xl-g11s-3-bfg-580) | 580 W | -60 W, hotter, -2.1 pp | | [Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585](https://comparepv.com/panel/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-585) | 585 W | -55 W, hotter, -1.9 pp | | [Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590](https://comparepv.com/panel/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-590) | 590 W | -50 W, hotter, -1.8 pp | | [Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 595](https://comparepv.com/panel/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-595) | 595 W | -45 W, hotter, -1.6 pp | | [Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 600](https://comparepv.com/panel/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-600) | 600 W | -40 W, hotter, -1.4 pp | | [Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 605](https://comparepv.com/panel/qcells-hanwha-q-cells-america-inc-q-peak-duo-xl-g11s-3-bfg-605) | 605 W | -35 W, hotter, -1.2 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +60 W, cooler, +2.1 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +55 W, cooler, +2.0 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +30 W, cooler, +1.9 pp | --- Source: https://comparepv.com/panel/q-cells-q-tron-xl-g2-3-bfg-640 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.