--- title: "RedSolar CETC-640T(GDF)/156 640W Solar Panel - Specs & Review | ComparePV" description: "RedSolar CETC-640T(GDF)/156 640W solar panel. Specs: 22.90% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/redsolar-cetc-640t-gdf-156" updated: 2026-09-11 --- # RedSolar CETC-640T(GDF)/156 Middle of its segment, weak in heat 1,086 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** RedSolar - **Model:** CETC-640T(GDF)/156 - **Series:** M10-MBB TOPCon Mono Bifacial Module - **Rated power:** 640 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) | 640 W | 620 W | Strong - top 9% | | | Module efficiency | 22.90% | 22.80% | Typical | 2,359 | | Power density | 229.0 | 227.7 | Typical | 2,389 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 19% | 6,093 | | Weight (kg) | 33.2 kg | 32.7 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.90% | 22.80% | Typical | 2,359 | | Power density | 229.0 | 227.7 | Typical | 2,389 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 19% | 6,093 | | Weight per kWp | 51.9 | 53.1 | Typical | 5,293 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **-0.300 %/°C temperature coefficient** - Bottom 19% of the TOPCon 600-650 W segment, against a median of -0.290. - **Best for:** Commercial and utility-scale. - **Not ideal for:** Hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 640 W - **Efficiency:** 22.90 % - **Voltage at Pmax (Vmp):** 47.16 V - **Current at Pmax (Imp):** 13.57 A - **Open-circuit voltage (Voc):** 55.57 V - **Short-circuit current (Isc):** 14.42 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.300 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.045 %/degC - **NOCT:** 42 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 156 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 2465 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 33.2 kg - **Area:** 2.80 m2 - **Power density:** 229.0 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:** 559 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 2359 of 14005 | | Power density | 2389 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 5293 of 14005 | | Warranty | 21 of 14005 | ## Pros - **N-type TOPCon cells with MBB layout** - The use of N-type TOPCon cells with multi busbar (MBB) technology reduces resistive losses and lowers sensitivity to partial shading compared to older PERC cells, resulting in higher real-world energy yield. - **30-year linear power warranty** - A 30-year power warranty combined with a 12-year product warranty matches the current premium standard for TOPCon modules, giving investors a predictable degradation profile with a low first-year power loss (typically around 1%). - **Bifacial technology boosting energy yield** - The double-sided cell structure (manufacturer-declared bifaciality up to approximately 80%) captures reflected radiation from the ground, increasing energy production from the same mounting area without additional installation costs, directly lowering LCOE. - **Resistance to ammonia corrosion and salt mist** - Certified resistance to PID, ammonia corrosion, and salt mist widens the series' applicability beyond standard commercial installations - the modules are suitable for demanding agricultural and coastal environments where material degradation is a common issue for cheaper series. - **High power output within standard M10 form factor** - Power output of 620-640 Wp in the standard M10 wafer format means higher power density per square meter of roof or ground than earlier module generations of the same size, easing system design where mounting space is limited. ## Cons - **Efficiency below segment leaders** - The maximum efficiency of 22.9% is lower than comparable TOPCon models from competitors - Luxen Solar N5 (23.14%) and Hanersun Hitouch 6N (23.3%) at the same 640 Wp maximum power. The 0.4-0.5 pp gap can translate into lower energy yield from the same area in space-constrained installations. - **No confirmed BNEF Tier-1 status** - Unlike established brands such as REC, RedSolar does not appear on publicly available BloombergNEF Tier-1 lists, which can matter for institutional investors and project bankability since this classification affects commercial bank financing terms. ## About this series The M10-MBB TOPCon Mono Bifacial Module series answers the growing demand from investors seeking maximum energy yield on limited installation space. The panels use **N-Type TOPCon cells** arranged in a **half-cell** layout with **multi busbar (MBB)** technology, delivering better high-temperature performance, lower sensitivity to partial shading, and reduced risk of hot spots. The use of **bifacial** cells further captures reflected radiation from the ground, boosting energy output without increasing the installation footprint, which directly translates into a lower LCOE. The module's construction is engineered for long-term reliability - resistance to PID, ammonia corrosion, and salt mist makes the series well suited for agricultural, coastal, and industrial installations where environmental conditions are particularly demanding. Low first-year power degradation and a stable linear performance curve over the following years make this series an attractive choice for investors focused on predictable return on investment. It's a solution dedicated to commercial and industrial installations, where every watt of power per square meter of roof or ground counts. ## Notable figures - At 22.9% efficiency, this panel is on par with typical \*\*TOPCon 600-650W\*\* modules - At 228.9 W/m² power density, roof space requirements are typical for \*\*TOPCon 600-650W\*\* panels - At -0.30%/°C, hot weather performance is typical for \*\*TOPCon 600-650W\*\* panels - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof - In the top 17% for efficiency among all TOPCon panels ## Questions ### How does TOPCon technology in RedSolar M10-MBB panels differ from classic PERC cells? The N-Type TOPCon cells used in the M10-MBB series offer higher efficiency and lower power degradation than older P-Type PERC cells. An additional passivation layer reduces electron recombination, resulting in better performance at high temperatures and higher energy yield, especially in summer when modules heat up significantly. ### What are the practical benefits of bifacial design in M10-MBB panels? Bifacial panels in the M10-MBB series capture sunlight on the rear side as well, allowing them to use light reflected from the roof, ground, gravel, or snow. Depending on the albedo of the surface and mounting height, this can add several to over ten percent extra energy yield without increasing the installation footprint, which lowers LCOE. ### What warranty comes with RedSolar M10-MBB TOPCon panels? The manufacturer provides a 12-year product warranty covering material and workmanship defects, plus a 30-year linear power warranty. This means a guaranteed, gradually declining power output level over three decades of operation, giving investors predictable returns on their installation. ### Are the 640 Wp M10-MBB panels suitable for large commercial roof installations? Yes, output up to 640 Wp per module combined with half-cell and multi busbar technology makes this series well suited for commercial and industrial installations, where maximizing power yield per square meter of roof or ground area is critical. High unit power reduces the number of modules needed and speeds up installation on large surfaces. ### Are RedSolar M10-MBB panels suitable for coastal or agricultural installations? Yes, modules in this series are resistant to ammonia corrosion and salt mist, making them suitable for both livestock farm installations and coastal areas with high air salinity. Additional PID resistance ensures stable system performance under demanding environmental conditions throughout the operating life. ### How much power degradation do M10-MBB panels experience in the first year? Thanks to N-Type TOPCon technology, M10-MBB panels show lower first-year power degradation compared to classic P-Type modules, and maintain a stable, linear degradation curve in subsequent years consistent with the 30-year power warranty. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/172412791798681lmu5-ac5180e563e6.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 | Cooler, 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 | Cooler, lighter, +1.9 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | Cooler, lighter, +1.9 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +1.9 pp | | [RedSolar CETC-620T(GDF)/156](https://comparepv.com/panel/redsolar-cetc-620t-gdf-156) | 620 W | -20 W, -0.7 pp | | [RedSolar CETC-625T(GDF)/156](https://comparepv.com/panel/redsolar-cetc-625t-gdf-156) | 625 W | -15 W, -0.5 pp | | [RedSolar CETC-630T(GDF)/156](https://comparepv.com/panel/redsolar-cetc-630t-gdf-156) | 630 W | -10 W, -0.4 pp | | [RedSolar CETC-635T(GDF)/156](https://comparepv.com/panel/redsolar-cetc-635t-gdf-156) | 635 W | Very close match | | [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/redsolar-cetc-640t-gdf-156 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.