--- title: "AmoSolar AS645G12-132 645W Solar Panel - Specs & Review | ComparePV" description: "AmoSolar AS645G12-132 645W solar panel. Specs: 20.76% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/amosolar-as645g12-132" updated: 2026-09-11 --- # AmoSolar AS645G12-132 Middle of its segment, modest efficiency 217 panels in the segment PERC 600-650 W ## Identity - **Manufacturer:** AmoSolar - **Model:** AS645G12-132 - **Series:** AS645-675G12-132 - **Rated power:** 645 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) | 645 W | 605 W | Strong - top 7% | | | Module efficiency | 20.76% | 21.38% | Weak - bottom 11% | 10,612 | | Power density | 207.6 | 213.8 | Weak - bottom 12% | 10,562 | | Temperature coefficient | -0.340 | -0.340 | Typical | 8,778 | | Weight (kg) | 33.0 kg | 34.0 kg | Typical | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 16% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.76% | 21.38% | Weak - bottom 11% | 10,612 | | Power density | 207.6 | 213.8 | Weak - bottom 12% | 10,562 | | Temperature coefficient | -0.340 | -0.340 | Typical | 8,778 | | Weight per kWp | 51.2 | 55.7 | Typical | 4,522 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 16% | 9,798 | ### Watch out for - **20.76% module efficiency** - Bottom 11% of the PERC 600-650 W segment, against a median of 21.38%. - **207.6 watts per square metre** - Bottom 12% of the PERC 600-650 W segment, against a median of 213.8. - **25 year performance warranty** - Bottom 16% of the PERC 600-650 W segment, against a median of 30 yrs. - **Best for:** Commercial, utility-scale and shaded-installations. - **Not ideal for:** Tight roof space, roofs where every square metre has to count and owners who want a long output guarantee. ## Specification ### Electrical - **Rated power (Pmax):** 645 W - **Efficiency:** 20.76 % - **Voltage at Pmax (Vmp):** 37.80 V - **Current at Pmax (Imp):** 17.07 A - **Open-circuit voltage (Voc):** 45.72 V - **Short-circuit current (Isc):** 18.14 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:** 0.040 %/degC - **NOCT:** 43 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 132 ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 33.0 kg - **Area:** 3.11 m2 - **Power density:** 207.6 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 84.8 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.55 % - **Output after 30 years:** 529 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 10612 of 14005 | | Power density | 10562 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 4522 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Premium class efficiency – up to 21.73%** - The best variant of the series (675 Wp) achieves a module efficiency of 21.73%, matching the Neo Solar Power NESE 655-675-66MHT-G12 (21.73%) and BYD AURO MSTK-33 (21.73%) models directly, and exceeding the median efficiency of the G12 PERC segment. For a 1 MWp solar farm, this translates to approximately 5% fewer panels compared to 20.5% efficient modules. - **G12 format with half-cut and multi-busbar** - 210x105 mm cells in a half-cut configuration reduce current losses under partial shading, and the multi-busbar (MBB) architecture reduces the risk of losses due to microcracks and shortens the current path. The combination of G12 + half-cut + MBB is a standard technical practice among the leading competitors in this power segment (Trina Vertex TSM-DE21, BYD AURO). - **The large format reduces costs for BOS.** - The 2384 x 1303 mm module with a power output of up to 675 Wp allows for the construction of a 1 MWp installation using approximately 1480 panels, rather than the typical ~2000 panels used in older 500 Wp modules. The reduced number of components shortens the installation time and reduces the costs associated with supporting structures, DC cabling, and connectors in commercial and utility projects. - **25-year warranty on power** - The manufacturer claims to maintain ≥84.8% of its nominal power output after 25 years of operation, which is equivalent to tier-1 standards (Trina Solar Vertex: 84.8% after 25 years). The power warranty is identical to that of comparable products, ensuring the predictability of the project's financial model. - **Seven power options (645–675 Wp)** - The 30 Wp in 7 steps feature enables precise configuration of string parameters to match the selected inverter (e.g., optimizing Voc/Vmp) without the need to redesign the entire system – a practical advantage in utility projects with strict voltage window requirements for MPPT. ## Cons - **PERC technology – higher LID and Pmax/°C** - P-type PERC cells exhibit a LID degradation of approximately 2% in the first year and an annual degradation of 0.45–0.55%, compared to a 1% LID and ~0.4%/year for the dominant N-type TOPCon technology, which accounts for approximately 66% of global production (data from 2024). The Pmax temperature coefficient is -0.34%/°C, while the temperature coefficients for competing TOPCon modules range from -0.29 to -0.32%/°C – a significant difference when operating in a Mediterranean climate or on unventilated roofs. - **Not a Tier-1 asset / not bankable** - AmoSolar is not listed on the BNEF Tier-1 list (Q1 2026 edition). For projects exceeding 1 MWp financed by banks with a bankable manufacturer clause (typical for project finance), the lack of this status may be a disqualifying factor or require additional production insurance, which increases the project's CAPEX. - **12-year product warranty – the lower end of the market** - Trina Solar Vertex TSM-DE21, along with most Tier-1 manufacturers in this segment, offers a 15-year warranty on the product. The 3-year difference can be significant for projects with Power Purchase Agreements (PPAs) or rooftop leasing arrangements, where the end customer requires at least a 15-year warranty on the product. - **Single-sided module** - The AS645-675G12-132 series is monofacial – the absence of a back surface eliminates the bifacial gain benefit, which is estimated to be 10–20% additional energy for ground-mounted installations on bright surfaces. The direct competitor in the AmoSolar catalog (series AS645-675G12-132B) offers a bifacial double-glass version. The choice between monofacial and bifacial should be made consciously and justified based on the project location. ## About this series The AmoSolar AS645-675G12-132 series is designed to maximize energy yield on large roof areas and in PV farms, where not only power output but also operational stability under real-world conditions are crucial. The use of **half-cut monocrystalline** and **multi-busbar** architectures helps minimize losses due to microcracks and partial shading, resulting in more predictable annual energy production. The modules are based on the G12 format, making it easier to build high-density power installations and reduce the number of panels needed to achieve the desired yield. Variants with **double-glass bifacial** construction are particularly advantageous for ground-mounted and bright installations - they allow for additional yield from the back side of the module and improve resistance to environmental conditions. The series is also distinguished by its **large module format**, which simplifies BOS cost optimization and speeds up installation in commercial and utility projects. This is a good choice for investors who want to combine high efficiency with durability and easy scalability. ## Notable figures - Module efficiency of 20.8% is 0.6pp below average for \*\*PERC 600-650W\*\* panels (median: 21.4%) - Power density of 207.6 W/m² is 6.2 W/m² below \*\*PERC 600-650W\*\* median (213.8 W/m²) - needs more roof space - Temperature coefficient of -0.34%/°C matches the \*\*PERC 600-650W\*\* median - At 33.0 kg, weight matches the \*\*PERC 600-650W\*\* median - #10612 for efficiency, #8778 for temperature performance out of 14005 panels ## Questions ### What warranty is provided for the AmoSolar AS645-675G12-132 panels? The AS645-675G12-132 series comes with a 12-year product warranty covering material and workmanship defects, along with a 25-year linear power output warranty. After 25 years of operation, modules are guaranteed to retain at least 84.8% of their nominal output power. It is worth noting that AmoSolar does not appear on Tier 1 manufacturer lists, which may be a relevant consideration when seeking bank financing for larger-scale projects. ### Are the AmoSolar AS645-675G12-132 panels suitable for utility-scale solar farms? Yes, the AS645-675G12-132 series is designed primarily for utility-scale installations and large commercial rooftops. The G12 format with 210 mm cells enables high power density and reduces the number of modules required to achieve a target yield, thereby lowering BoS costs and accelerating installation. The maximum power output of a single module reaches 675 Wp. ### How do half-cut cell and multi-busbar technologies affect the performance of the AS645-675G12-132 panels? Half-cut cells reduce internal electrical resistance and limit the impact of partial shading — when one portion of the panel is shaded, the other half continues to generate power with minimal loss. The multi-busbar architecture shortens the electron path and reduces the risk of damage caused by microcracks in the cells. Both technologies combined result in a more stable and predictable energy yield throughout the year. ### Is the AmoSolar AS645-675G12-132 series bifacial? No, the standard AS645-675G12-132 series is a monofacial module — energy is harvested exclusively from the front side of the panel. If additional yield from albedo reflection is a priority — for example, in a ground-mounted installation over a light-colored surface — it is worth considering the bifacial double-glass variant designated with the suffix 132B, which AmoSolar offers as a separate series. ### What are the dimensions and weight of the AmoSolar AS645-675G12-132 panels, and how do they affect installation complexity? Modules in this series measure 2384 × 1303 × 35 mm and weigh approximately 33 kg. These are typical dimensions for the G12 format, requiring at least two installers for safe handling on a rooftop. However, the large format accelerates the completion of extensive installations, as each module replaces several smaller panels, reducing the number of electrical connections and overall labor time. ### What is the efficiency of the AmoSolar AS645-675G12-132 panels and how do they perform at elevated temperatures? Depending on the power variant, module efficiency ranges from 20.76% to 21.73% as measured under Standard Test Conditions (STC). The temperature coefficient of Pmax is -0.34%/°C, meaning that at a module surface temperature of 60°C, output power decreases by approximately 12% relative to the nominal STC value. This performance is characteristic of PERC technology and is comparable to competing modules in this power class. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/210-mono-half-cell-132cells-645-675w-2384-1303-35-de019f7aa7ac.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +4.4 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, +4.4 pp, +5 yr warranty | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, +4.2 pp, +5 yr warranty | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +4.2 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +50 W, cooler, +4.1 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, +4.0 pp, +5 yr warranty | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | Cooler, +4.0 pp, +5 yr warranty | | [AmoSolar AS650G12-132](https://comparepv.com/panel/amosolar-as650g12-132) | 650 W | Very close match | | [AmoSolar AS655G12-132](https://comparepv.com/panel/amosolar-as655g12-132) | 655 W | +10 W, +0.3 pp | | [AmoSolar AS660G12-132](https://comparepv.com/panel/amosolar-as660g12-132) | 660 W | +15 W, +0.5 pp | | [AmoSolar AS665G12-132](https://comparepv.com/panel/amosolar-as665g12-132) | 665 W | +20 W, +0.6 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +160 W, cooler, +4.3 pp | | [AIKO AIKO-A800-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a800-grh78dw) | 800 W | +155 W, cooler, +4.1 pp | | [AIKO AIKO-A795-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a795-grh78dw) | 795 W | +150 W, cooler, +4.0 pp | | [AIKO AIKO-A790-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a790-grh78dw) | 790 W | +145 W, cooler, +3.8 pp | | [Trina Solar TSM-NEG21C.20Q-760](https://comparepv.com/panel/trina-solar-tsm-neg21c-20q-760) | 760 W | +115 W, cooler, +3.7 pp | --- Source: https://comparepv.com/panel/amosolar-as645g12-132 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.