--- title: "AIKO AIKO-A650-GRH66Dw 650W Solar Panel - Specs & Review | ComparePV" description: "AIKO AIKO-A650-GRH66Dw 650W solar panel: 2 shop offers from 466.07 zł. Specs: 24.10% efficiency, Monocrystalline cells." source: "https://comparepv.com/panel/aiko-aiko-a650-grh66dw" updated: 2026-10-05 --- # AIKO AIKO-A650-GRH66Dw Middle of its segment, needs the roof space 80 panels in the segment Back Contact 650-700 W ## Identity - **Manufacturer:** AIKO - **Model:** AIKO-A650-GRH66Dw - **Series:** Stellar 1N+66 - **Rated power:** 650 W - **Cell technology:** Back Contact - **Bifacial:** yes ## Price offers Prices are the figure each shop printed, on that shop's side of VAT. | Shop | Market | Price | Per kWp | Availability | Last read | | --- | --- | --- | --- | --- | --- | | [7Sun](https://comparepv.com/go/133) | Poland | 466.07 zł incl. VAT | 717.03 zł/kWp | In stock | Last read 5 Oct 15:06 | | [SolVolte Sklep](https://comparepv.com/go/477757) | Poland | 516 zł incl. VAT | 793.85 zł/kWp | In stock | Last read 5 Oct 01:46 | ## How it compares Compared against segment Back Contact 650-700 W (80 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 650 W | 660 W | Weak - bottom 10% | | | Module efficiency | 24.10% | 24.40% | Weak - bottom 20% | 219 | | Power density | 240.6 | 244.3 | Weak - bottom 14% | 233 | | Temperature coefficient | -0.260 | -0.260 | Typical | 511 | | Weight (kg) | 32.5 kg | 32.5 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 24.10% | 24.40% | Weak - bottom 20% | 219 | | Power density | 240.6 | 244.3 | Weak - bottom 14% | 233 | | Temperature coefficient | -0.260 | -0.260 | Typical | 511 | | Weight per kWp | 50.0 | 49.7 | Typical | 3,317 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **240.6 watts per square metre** - Bottom 14% of the Back Contact 650-700 W segment, against a median of 244.3. - **24.10% module efficiency** - Bottom 20% of the Back Contact 650-700 W segment, against a median of 24.40%. - **Best for:** Commercial, utility-scale, shaded-installations, hot-climate and cold-climate. - **Not ideal for:** Roofs where every square metre has to count and tight roof space. ## Specification ### Electrical - **Rated power (Pmax):** 650 W - **Efficiency:** 24.10 % - **Voltage at Pmax (Vmp):** 42.00 V - **Current at Pmax (Imp):** 15.48 A - **Open-circuit voltage (Voc):** 49.30 V - **Short-circuit current (Isc):** 16.62 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:** 132 - **Bifacial:** yes - **Bifacial gain:** 10.00 ### Physical - **Length:** 2382 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 32.5 kg - **Area:** 2.70 m2 - **Power density:** 240.6 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:** 578 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 219 of 14005 | | Power density | 233 of 14005 | | Temperature coefficient | 511 of 14005 | | Weight | 3317 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Efficiency of 23.7–24.4% – among the best in the segment** - The series achieves peak efficiencies comparable to those of Longi Hi-MO 9 and Canadian Solar TOPBiHiKu6 (both 24.4%), while also exceeding Sunpro TOPCon 210 (23.32%) by more than 1 percentage point. Higher efficiency directly reduces the required roof or ground space for the same power output. - **Temperature coefficient –0.26%/°C** - Standard TOPCon panels from comparable manufacturers (Longi, Canadian Solar) achieve -0.30%/°C. This 0.04% advantage means that at a module temperature of 70°C (typical summer, dark roof), AIKO losses are approximately 2% lower – resulting in a significant increase in yield during hot months on large-scale farms. - **Minimal degradation – 88.85% after 30 years** - Guaranteed power loss below 1% in the first year and a maximum of 0.35%/year in years 2-30. Typical TOPCon panels degrade at approximately 0.40%/year, which after 30 years results in approximately 87% – a difference of 1.85% translates to an additional 12 MWh of energy per MW of installed capacity over the investment horizon. - **ABC Technology – Zero Losses from Busbars** - Transferring all contacts to the rear of the cell eliminates the shadow cast by the metal contact frames, which cover 5–8% of the surface area in front-facing technologies (TOPCon, PERC). The entire active surface absorbs light, and the back contact architecture provides better performance under partial shading compared to competitors of the same power class. - **Dual-speed, bidirectional construction (up to 70%)** - The 2mm front and back glass eliminates the risk of delamination of the backsheet film and moisture ingress – common problems with backsheet modules after 15+ years of use. The bifacial design, up to 70%, allows for an additional energy gain of up to 25% from reflection off the ground, which is particularly cost-effective on ground-mounted farms with clear soil or snow. ## Cons - **Premium pricing: 10–20% higher than TOPCon** - The ABC technology requires dedicated, more expensive production lines. Market data from 2025 indicates a premium of 10–20% compared to comparable power modules in the TOPCon segment (e.g., Canadian Solar TOPBiHiKu6 or Longi Hi-MO 9). For projects where the key performance indicator (KPI) is the cost of capital expenditure (CAPEX) rather than maximum power output, the technological advantage may not offset the higher investment cost. ## About this series AIKO Stellar 1N+66 is an advanced series of modules utilizing groundbreaking **All-Back-Contact (ABC) cell** technology, which completely eliminates energy losses resulting from front-side shading by busbars. By moving the contacts to the rear, the entire front surface of the module actively absorbs light, translating into unrivaled power density. A key innovation distinguishing this line is the **partial shading optimization function**, allowing modules to work efficiently in conditions where standard panels drastically lose efficiency. This solves the real problem of production drops caused by architectural elements, chimneys, or leaves. The Stellar series is primarily dedicated to large commercial installations and solar farms, where maximum return on investment matters most. What sets these panels apart from competing solutions is the exceptional **minimal power degradation over time** and excellent performance parameters at high temperatures. The use of N-type silicon in combination with a unique architecture makes AIKO Stellar 1N+66 an **innovative premium-class solution** for the most demanding investors. By choosing this technology, you are opting for energy production stability and the highest aesthetics without visible silver tracks. It is currently one of the most **technologically advanced products** available on the market. ## Notable figures - Efficiency of 24.1% matches the \*\*Back Contact 650-700W\*\* median - Power density of 240.6 W/m² is 3.7 W/m² below \*\*Back Contact 650-700W\*\* median (244.3 W/m²) - needs more roof space - Temperature coefficient of -0.26%/°C matches the \*\*Back Contact 650-700W\*\* median - 55% bifaciality enables rear-side power generation, boosting yield by 3-8% on reflective surfaces - Ranked #219 out of 14005 panels for efficiency in the database ## Questions ### What is the warranty on Aiko Stellar 1N+66 solar panels? The AIKO Stellar 1N+66 is covered by a 15-year product warranty from the manufacturer, as well as a 30-year performance warranty. Degradation is limited to a maximum of 1% in the first year, and then only 0.35% per year in subsequent years. In practice, this means that after 30 years, the panel retains more than 87% of its nominal output power – one of the best results among available modules. ### What distinguishes the ABC technology in the AIKO Stellar 1N+66 panels from standard panels? In the All-Back-Contact (ABC) technology, all electrical contacts are moved to the back surface of the cell. The front of the module is completely free of collecting strips, which eliminates shading of the active layer by metallic traces. This allows the module's efficiency to reach up to 24.6%, and the panel looks aesthetically pleasing – without visible silver lines. This is a key advantage over standard PERC or TOPCon technologies. ### Does the AIKO Stellar 1N+66 perform adequately in partially shaded conditions, for example, when located near a chimney? Yes, the Stellar 1N+66 series features an integrated optimization function for partial shading. This means that shading of a portion of the module by a chimney, antenna, neighboring building, or tree leaves does not cause the dramatic drop in production that is typical of conventional panels. This is particularly important in installations on roofs with architectural elements or in challenging urban locations. ### What is the maximum power output of an Aiko Stellar 1N+66 panel, and what are the implications for its installation? The maximum power output of a module in the Stellar 1N+66 series is 660 Wp. Due to its high power density, only approximately 16 panels are needed to achieve an installation with a power of, for example, 10 kWp, instead of 20–25 panels required for popular 400–500 W modules. This translates to less roof space, fewer mounting points, and lower construction costs – which is particularly important in large commercial projects and solar farms. ### Is the AIKO Stellar 1N+66 a bifacial module, and is it worth paying extra for this feature? Yes, the Stellar 1N+66 is a bifacial module with a dual-glass design, which absorbs light from both the front and the back (reflected from the ground or surroundings). In the case of ground-mounted, flat-roof installations with a light-colored membrane or photovoltaic farms, this can increase energy yield by 5–15% compared to a single-sided module. In the case of sloped roof installations with dark coverings, the bifacial effect is marginal. ### Is AIKO a reputable manufacturer, and will the Stellar 1N+66 panels be serviceable after several years? AIKO Solar is classified as a Tier 1 manufacturer by independent industry agencies, which confirms its financial stability and production capabilities. The company has its own manufacturing facilities in China and actively invests in R&D. The Stellar 1N+66 series is currently available for sale, and its expanded distribution network in Europe ensures access to service and warranty claim support in Poland. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/4d3221ae3606eeb5ec1db24d.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Lighter, +1.1 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +30 W, lighter, +1.1 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +25 W, lighter, +0.9 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Lighter, +0.9 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +50 W, heavier, +0.9 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +45 W, heavier, +0.8 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +20 W, lighter, +0.7 pp | | [AIKO AIKO-G625-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g625-mch72mw) | 625 W | -25 W, lighter, -1.0 pp | | [AIKO AIKO-G630-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g630-mch72mw) | 630 W | -20 W, lighter, -0.8 pp | | [AIKO AIKO-G635-MCH72Dw](https://comparepv.com/panel/aiko-aiko-g635-mch72dw) | 635 W | -15 W, heavier, -0.6 pp | | [AIKO AIKO-G640-MCH72Dw](https://comparepv.com/panel/aiko-aiko-g640-mch72dw) | 640 W | -10 W, heavier, -0.4 pp | | [AIKO AIKO-G645-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g645-mch72mw) | 645 W | Lighter, -0.2 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +20 W, lighter, +0.7 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +20 W, +0.7 pp | --- Source: https://comparepv.com/panel/aiko-aiko-a650-grh66dw 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.