--- title: "Adani Solar ASM-M12-132-640 640W Solar Panel - Specs & Review | ComparePV" description: "Adani Solar ASM-M12-132-640 640W solar panel. Specs: 20.55% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/adani-solar-asm-m12-132-640" updated: 2026-09-11 --- # Adani Solar ASM-M12-132-640 Middle of its segment, modest efficiency 217 panels in the segment PERC 600-650 W ## Identity - **Manufacturer:** Adani Solar - **Model:** ASM-M12-132-640 - **Series:** ETERNAL PRIDE Series - **Rated power:** 640 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 600-650 W (217 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 640 W | 605 W | Strong - top 16% | | | Module efficiency | 20.55% | 21.38% | Weak - bottom 2% | 11,208 | | Power density | 205.5 | 213.8 | Weak - bottom 2% | 11,191 | | Temperature coefficient | -0.340 | -0.340 | Typical | 8,778 | | Weight (kg) | 33.6 kg | 34.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.55% | 21.38% | Weak - bottom 2% | 11,208 | | Power density | 205.5 | 213.8 | Weak - bottom 2% | 11,191 | | Temperature coefficient | -0.340 | -0.340 | Typical | 8,778 | | Weight per kWp | 52.5 | 55.7 | Typical | 6,043 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **20.55% module efficiency** - Bottom 2% of the PERC 600-650 W segment, against a median of 21.38%. Ranked 11,208th in the whole database. - **205.5 watts per square metre** - Bottom 2% of the PERC 600-650 W segment, against a median of 213.8. Ranked 11,191st in the whole database. - **Best for:** Utility-scale, commercial and hot-climate. - **Not ideal for:** Tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 640 W - **Efficiency:** 20.55 % - **Voltage at Pmax (Vmp):** 37.01 V - **Current at Pmax (Imp):** 17.31 A - **Open-circuit voltage (Voc):** 43.28 V - **Short-circuit current (Isc):** 18.69 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.340 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.041 %/degC - **NOCT:** 44 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 132 ### Physical - **Length:** 2390 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 33.6 kg - **Area:** 3.11 m2 - **Power density:** 205.5 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 82.0 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.55 % - **Output after 30 years:** 525 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 11208 of 14005 | | Power density | 11191 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 6043 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Favorable temperature coefficient** - The Pmax value of -0.34%/°C places the series above the average for PERC technology (-typically -0.37 to -0.40%/°C), resulting in a higher actual yield during hot summer months and in tropical climates – which is significant for large ground-mounted installations. - **30-year linear power warranty** - The manufacturer offers a 30-year linear performance warranty, which is the standard for premium-segment photovoltaic panels and exceeds the typical 25-year warranty offered by many Tier-1 players such as JA Solar and Trina Solar, for comparable production years. - **MBB architecture + half-cut** - The use of Multi-Busbar (MBB) technology in combination with half-cut cells reduces internal resistance and minimizes the impact of partial shading on the overall power output of the module – a key advantage in ground-mounted solar farms with complex environments. - **Tier-1 bankability rating (according to BNEF)** - Adani Solar is listed on Bloomberg NEF's Tier-1 list, which confirms the financial viability of the manufacturer – a key requirement when securing financing from independent commercial banks and a standard clause in most Power Purchase Agreements (PPAs) for installations exceeding 10 MW. ## Cons - **The product line has been discontinued.** - ETERNAL PRIDE has been discontinued (production stopped, initial release in 2021). This means limited availability of replacement parts, no service support for new orders, and potential difficulties in expanding the system in the future. - **Performance significantly below that of market competitors** - The efficiency of these modules is only 20.23–20.87%, while direct competitors in the same power range (630–650 W) achieve: BYD Auro N — 23.25%, Astronergy ASTRO N5 — 23.30%, Jinko Tiger Neo — 24.06%. This means that approximately 15% more modules are needed to achieve the same power output, which increases construction and ground costs. - **PERC Technology in the Market** - In 2024, TOPCon technology surpassed PERC technology in terms of global production capacity, achieving approximately 66% of the total production capacity. All three comparable competitors (BYD, Astronergy, and Jinko) operate using N-type TOPCon cells, which are characterized by lower LID degradation and better bifaciality (80–85% vs 70% for PERC). The ETERNAL PRIDE series is based on the older P-type PERC platform. - **Lack of bifaciality** - The version in question is a monofacial module (is\_bifacial: false), while all three comparable competing series offer a bifacial option at the same peak power. In ground-mounted installations with a clear substrate (sand, gravel, light concrete), bifaciality can generate an additional 5–15% of energy yield. ## About this series Adani Solar ETERNAL PRIDE series panels bring a new quality to large-scale projects, utilizing **bifacial technology**, which allows for additional energy yield from the rear side of the module by using reflected light. Thanks to the use of **Mono-PERC cells in MBB architecture**, this design effectively minimizes internal losses and optimizes current flow, which is crucial during operation in high temperatures and low sunlight conditions. This series solves the problem of long-term power loss through **high resistance to PID degradation** and the LID phenomenon, ensuring stable energy yields for decades. Exceptional resistance to extreme snow and wind loads makes these components dedicated primarily to demanding photovoltaic farms and large industrial installations, where maximizing profitability from every square meter of area matters. What distinguishes ETERNAL PRIDE from standard competitive solutions is **exceptional mechanical stability** combined with rigorous cell quality control, guaranteeing reliability in harsh environmental conditions. By choosing this series, investors receive a product optimized for the lowest levelized cost of energy (LCOE), which effectively combines innovative design with a real increase in the efficiency of ground-mounted and flat-roof systems. An **excellent temperature coefficient** ensures that these modules maintain efficiency where other panels lose their performance. ## Notable figures - Module efficiency of 20.6% is 0.8pp below average for \*\*PERC 600-650W\*\* panels (median: 21.4%) - At 205.5 W/m², this panel generates 8.3 W/m² less per unit area than \*\*PERC 600-650W\*\* median (213.8 W/m²) - At -0.34%/°C, hot weather performance is typical for \*\*PERC 600-650W\*\* panels - #11208 for efficiency, #8778 for temperature performance out of 14005 panels ## Questions ### Are Adani Solar ETERNAL PRIDE Series panels still available for purchase? The ETERNAL PRIDE series has been discontinued by Adani Solar and is no longer actively available through regular distribution channels. If you require modules from this manufacturer with comparable specifications, it is worth consulting your supplier about current replacement options from newer Adani Solar product lines, or checking for remaining warehouse stock. Before purchasing any residual inventory, verify that the panels are new and have been stored in accordance with the manufacturer's requirements, as improper storage conditions may affect warranty validity. ### What is the warranty coverage for Adani Solar ETERNAL PRIDE Series panels? The manufacturer provides a 12-year product warranty covering physical defects and material faults, along with a 30-year linear power output warranty. Under the linear degradation schedule, power output may not decline by more than 2% in the first year of operation, followed by a maximum annual degradation rate of 0.55% in subsequent years. This means that after 30 years of service, the module is guaranteed to retain at least 84.8% of its original rated power output. This represents one of the more rigorous degradation schedules available in the utility-scale module market. ### What is the Mono-PERC MBB technology used in ETERNAL PRIDE panels and what practical advantages does it offer? Mono-PERC (Passivated Emitter Rear Contact) is a cell technology that improves light-to-electricity conversion efficiency by applying a passivation layer to the rear surface of the cell, reducing recombination losses. MBB (Multi Busbar) replaces a few wide busbars with a greater number of narrower ones, shortening the current path within each cell and reducing resistive losses. As a result, ETERNAL PRIDE panels achieve module efficiencies of 20.23–20.87% and a low temperature coefficient of -0.34%/°C, translating into higher energy yields on hot, high-irradiance days compared to older-generation PERC designs. ### Are the ETERNAL PRIDE 650W panels suitable for large-scale solar farms and industrial installations? Yes, the ETERNAL PRIDE 650W series was designed specifically for utility-scale and industrial applications. The module measures 2390 × 1303 × 35 mm, weighs 33.6 kg, and is rated to withstand a front-side mechanical load of up to 5400 Pa and a rear-side load of up to 2400 Pa, meeting the structural requirements for sites exposed to high wind speeds and heavy snow accumulation. The high unit power output of 650 Wp reduces the total number of modules required and lowers BoS cabling costs, thereby improving the overall LCOE of the entire plant. ### How do Adani Solar ETERNAL PRIDE panels perform at high operating temperatures on hot days? The temperature coefficient of maximum power output (Pmax) is -0.34%/°C, meaning that for every degree Celsius above 25°C (STC), the module loses 0.34% of its rated power. This figure is better than that of standard older-generation PERC panels, which typically range from -0.37 to -0.40%/°C. At a cell operating temperature of, for example, 65°C, the power loss amounts to approximately 13.6%, compared to over 15% in lower-performing modules — a difference that results in measurably higher energy yields during hot, sunny months. ### Are ETERNAL PRIDE panels monofacial or bifacial, and do they feature a glass rear surface? The ETERNAL PRIDE series in the ASM-M12-132 configuration is a monofacial module equipped with a polymer backsheet rather than a glass rear surface, generating electricity exclusively from the front side. Adani Solar also offered a bifacial glass-glass (G2G) variant under the ELAN PRIDE series, which captures additional energy from reflected albedo light on the rear side. Choosing the ETERNAL PRIDE in its monofacial configuration provides lower weight and simplified installation, but foregoes the additional energy yield available from a bifacial design. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/pride-monofacial-modules-8f007950d78a.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +4.6 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, lighter, +4.6 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, lighter, +4.4 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +4.4 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +4.2 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | Cooler, lighter, +4.2 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +4.2 pp | | [Adani Solar ASM-M12-132-630](https://comparepv.com/panel/adani-solar-asm-m12-132-630) | 630 W | -10 W, -0.3 pp | | [Adani Solar ASM-M12-132-635](https://comparepv.com/panel/adani-solar-asm-m12-132-635) | 635 W | Very close match | | [Adani Solar ASM-M12-132-645](https://comparepv.com/panel/adani-solar-asm-m12-132-645) | 645 W | Very close match | | [Adani Solar ASM-M12-132-650](https://comparepv.com/panel/adani-solar-asm-m12-132-650) | 650 W | +10 W, +0.3 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +165 W, cooler, +4.6 pp | | [AIKO AIKO-A800-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a800-grh78dw) | 800 W | +160 W, cooler, +4.3 pp | | [AIKO AIKO-A795-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a795-grh78dw) | 795 W | +155 W, cooler, +4.2 pp | | [AIKO AIKO-A790-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a790-grh78dw) | 790 W | +150 W, cooler, +4.1 pp | | [Trina Solar TSM-NEG21C.20Q-760](https://comparepv.com/panel/trina-solar-tsm-neg21c-20q-760) | 760 W | +120 W, cooler, +3.9 pp | --- Source: https://comparepv.com/panel/adani-solar-asm-m12-132-640 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.