--- title: "AIKO AIKO-A655-MAH78Dw 655W Solar Panel - Specs & Review | ComparePV" description: "AIKO AIKO-A655-MAH78Dw 655W solar panel. Specs: 23.40% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/aiko-aiko-a655-mah78dw" updated: 2026-09-11 --- # AIKO AIKO-A655-MAH78Dw Middle of its segment, modest efficiency 80 panels in the segment Back Contact 650-700 W ## Identity - **Manufacturer:** AIKO - **Model:** AIKO-A655-MAH78Dw - **Series:** Neostar 1U+ (Dual-Glass Module 655W-680W) - **Rated power:** 655 W - **Cell technology:** Back Contact - **Bifacial:** yes ## How it compares Compared against segment Back Contact 650-700 W (80 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 655 W | 660 W | Typical | | | Module efficiency | 23.40% | 24.40% | Weak - bottom 1% | 882 | | Power density | 234.3 | 244.3 | Weak - bottom 1% | 857 | | Temperature coefficient | -0.260 | -0.260 | Typical | 511 | | Weight (kg) | 34.7 kg | 32.5 kg | Weak - bottom 1% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.40% | 24.40% | Weak - bottom 1% | 882 | | Power density | 234.3 | 244.3 | Weak - bottom 1% | 857 | | Temperature coefficient | -0.260 | -0.260 | Typical | 511 | | Weight per kWp | 53.0 | 49.7 | Weak - bottom 1% | 6,694 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **23.40% module efficiency** - Bottom 1% of the Back Contact 650-700 W segment, against a median of 24.40%. Ranked 882nd in the whole database. - **234.3 watts per square metre** - Bottom 1% of the Back Contact 650-700 W segment, against a median of 244.3. Ranked 857th in the whole database. - **53.0 kg per kWp** - Bottom 1% of the Back Contact 650-700 W segment, against a median of 49.7. Ranked 6,694th in the whole database. - **Best for:** Utility-scale, commercial and shaded-installations. - **Not ideal for:** Tight roof space, roofs where every square metre has to count and weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 655 W - **Efficiency:** 23.40 % - **Voltage at Pmax (Vmp):** 48.61 V - **Current at Pmax (Imp):** 13.48 A - **Open-circuit voltage (Voc):** 58.74 V - **Short-circuit current (Isc):** 14.21 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.260 %/degC - **Temperature coefficient of Voc:** -0.220 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** Back Contact - **Cell count:** 156 - **Bifacial:** yes ### Physical - **Length:** 2465 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 34.7 kg - **Area:** 2.80 m2 - **Power density:** 234.3 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 88.8 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.35 % - **Output after 30 years:** 582 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 882 of 14005 | | Power density | 857 of 14005 | | Temperature coefficient | 511 of 14005 | | Weight | 6694 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Efficiency of 24.3% – the highest in the segment** - Maximum efficiency of 24.3% exceeds direct competitors by more than 2.4 percentage points: SpolarPV SPV680 and Solaria SPVxxx achieve 21.92%, while Vikram Solar PARADEA achieves 21.89%. This translates to a real increase in energy generation from the same roof area or PV field. - **Exceptionally low ABC degradation** - The N-type ABC technology offers degradation of ≤1% in the first year and ≤0.35%/year in years 2–30. According to AIKO data, this represents a reduction of approximately 1.5% in power loss after 30 years compared to TOPCon modules (≈0.40–0.45%/year), which directly translates into higher cumulative energy yield throughout the entire lifespan of the installation. - **Back Contact (XBC) – zero shadowing of electrodes** - Moving all the electrodes to the back side of the cell eliminates losses due to shading by rails and improves performance under diffuse light conditions. This is particularly important in roof-mounted systems with partial shading (chimneys, antennas, neighboring sections), where PERC and TOPCon technologies experience proportionally greater power losses. - **Dual-Glass construction and 30-year power warranty** - The double-layer glass provides greater resistance to moisture, UV radiation, and corrosion compared to a backsheet film, which justifies the manufacturer's 30-year linear warranty. For comparison, most modules with backsheet film offer a 25-year warranty with a decrease to 84.8% in power; the Neostar 1U+ maintains ≥87% after 30 years. - **High power of 680 W – lower cost for BOS** - The peak power of 680 W per module (2465×1134 mm format, 132 cells) allows for the construction of a system with the desired power output using fewer modules than comparable systems with the same maximum power, thereby reducing the number of MC4 connectors, mounting terminals, and assembly hours – which lowers the overall system cost (Balance of System). ## Cons - **A lower bifaciality ratio compared to TOPCon.** - In back-contact architecture, the rear surface of the cell is occupied by an electrode grid, which structurally limits bifaciality to approximately 65-70% (compared to approximately 80-85% for standard bifacial TOPCon N-type modules). In ground-mounted and flat-roof installations with a light-colored surface, the gain from the surface albedo will be lower than that of TOPCon modules with similar power output. - **Larger mass of the Dual-Glass module** - The glass-glass construction with 78 cells results in a module weight of approximately 35–38 kg, compared to 28–31 kg for comparable 680 Wp single-glass modules. This could be a limitation for roofs with low load-bearing capacity (e.g., old sheds, lightweight steel structures) or increase installation costs, as it requires two installers. ## About this series AIKO Neostar 1U+ (Dual-Glass Module 655W-680W) is designed for maximum yield from the same installation surface, while simultaneously simplifying the system design. The application of **XBC technology** with a front without classical busbars improves light usage and reduces shading losses, which is appreciated by investors in roof systems with seasonal shading elements. The **dual-glass** construction increases resistance to external conditions and operational stability over the long term, translating to lower warranty claim risks and smoother operation. In practice, this series helps reduce equipment costs - thanks to the high power of a single module, it is easier to build an installation with the target power using fewer panels, thus requiring fewer connectors and terminals. For installers, **resistance to micro-cracking** is also important, as it minimizes losses during transportation and installation. Neostar 1U+ is a good choice for utility-scale PV farms, large commercial rooftops, and projects where **low BOS** (Balance of System) and predictable, long-term energy production are key. ## Notable figures - Efficiency of 23.4% is 1.0pp below the \*\*Back Contact 650-700W\*\* median (24.4%) - Power density of 234.3 W/m² is 10.0 W/m² below \*\*Back Contact 650-700W\*\* median (244.3 W/m²) - needs more roof space - At -0.26%/°C, hot weather performance is typical for \*\*Back Contact 650-700W\*\* panels - Weight of 34.7 kg is 2.2 kg above \*\*Back Contact 650-700W\*\* median (32.5 kg) - verify structural support - 70% bifaciality enables rear-side power generation, boosting yield by 4-10% on reflective surfaces ## Questions ### What is the XBC (ABC) technology in AIKO Neostar 1U+ panels, and why is it beneficial? XBC (also known as ABC – All Back Contact) is a solar cell design in which all electrical contacts are located on the back. The front panel is completely free of busbars, which increases the light-absorbing surface area and improves efficiency to 24.3% – one of the highest among mass-produced modules. This translates to more energy from the same square meter of roof or ground. ### How does the AIKO Neostar 1U+ handle partial shading, such as that caused by a chimney or skylight? Thanks to the XBC technology, which eliminates traditional front-facing busbars, Neostar 1U+ modules are less susceptible to "hot-spot" effects and losses due to partial shading compared to traditional modules with busbars. This is a significant advantage for roofs, where shading occurs seasonally or at specific times of day. The bifacial nature of the panel also allows for the collection of scattered light from the back, partially compensating for losses. ### What is the warranty on Aiko Neostar 1U+ panels, and what does it cover? The manufacturer provides a 15-year product warranty for material and workmanship defects, as well as a 30-year linear warranty for power output. Degradation is limited to a maximum of 1% in the first year and no more than 0.35% per year in subsequent years. After 30 years, the panel should maintain at least approximately 87.4% of its nominal power output. AIKO is a Tier 1 manufacturer, which ensures the financial credibility of the warranty. ### What is the weight of the AIKO Neostar 1U+ module, and is it suitable for a typical industrial roof or a sloped roof? The panel weighs approximately 34.7 kg with dimensions of 2465 x 1134 x 30 mm. It is a utility-class module – large and heavy, primarily intended for solar farms and large industrial rooftops with sufficient load-bearing capacity. On the sloping roofs of residential buildings, it will only be suitable if the roof structure can withstand the increased load; in such cases, it is advisable to consult with a structural engineer. ### Do the Aiko Neostar 1U+ panels function effectively at high temperatures during the summer? Yes. The temperature coefficient for power output is -0.26%/°C, which is a better result than typical PERC modules (-0.35%/°C). This means lower power losses on hot summer days. For example, at an operating temperature of 65°C (typical in August), the Neostar 1U+ will lose approximately 10.4% of its power, compared to approximately 13.7% for older technology – a difference that is noticeable in the annual energy yield. ### Does the dual-glass panel design of the AIKO Neostar 1U+ panels actually extend the lifespan of the installation? Yes. Two sheets of glass (each 2.0 mm thick) replace the back foil of the laminate, eliminating the primary path for water ingress. Dual-glass modules exhibit lower PID (Potential Induced Degradation) degradation rates and greater resistance to UV radiation, wind, and snow. Combined with a 30-year power warranty and N-type cell technology, the Neostar 1U+ series is designed for installations where long-term energy production stability is a key selection criterion. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/neostar-1u-plus-aiko-a-mah78dw-655w-680w-2465x1134x30mm-dsdr-28dcdba9e33d.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Lighter, +1.8 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +25 W, lighter, +1.8 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +20 W, lighter, +1.6 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | -10 W, lighter, +1.6 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +45 W, +1.6 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +40 W, +1.5 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +15 W, lighter, +1.4 pp | | [AIKO AIKO-A660-MAH78Dw](https://comparepv.com/panel/aiko-aiko-a660-mah78dw) | 660 W | +0.2 pp | | [AIKO AIKO-A665-MAH78Dw](https://comparepv.com/panel/aiko-aiko-a665-mah78dw) | 665 W | +10 W, +0.4 pp | | [AIKO AIKO-A670-MAH78Dw](https://comparepv.com/panel/aiko-aiko-a670-mah78dw) | 670 W | +15 W, +0.6 pp | | [AIKO AIKO-A675-MAH78Dw](https://comparepv.com/panel/aiko-aiko-a675-mah78dw) | 675 W | +20 W, +0.7 pp | | [AIKO AIKO-A680-MAH78Dw](https://comparepv.com/panel/aiko-aiko-a680-mah78dw) | 680 W | +25 W, +0.9 pp | | [AIKO AIKO-A685-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a685-mae78dw) | 685 W | +30 W, +1.1 pp | | [AIKO AIKO-A690-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a690-mae78dw) | 690 W | +35 W, +1.3 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +15 W, lighter, +1.4 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +15 W, lighter, +1.4 pp | --- Source: https://comparepv.com/panel/aiko-aiko-a655-mah78dw 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.