--- title: "AIKO AIKO-A790-GRH78Dw 790W Solar Panel - Specs & Review | ComparePV" description: "AIKO AIKO-A790-GRH78Dw 790W solar panel. Specs: 24.60% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/aiko-aiko-a790-grh78dw" updated: 2026-09-11 --- # AIKO AIKO-A790-GRH78Dw Efficiency leader, no clear weak spot 886 panels in the 690-890 W band, all technologies ## Identity - **Manufacturer:** AIKO - **Model:** AIKO-A790-GRH78Dw - **Series:** Stellar 2N+78 - **Rated power:** 790 W - **Cell technology:** Back Contact - **Bifacial:** yes ## How it compares Compared against 690-890 W band, all technologies (886 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 790 W | 710 W | Strong - top 1% | | | Module efficiency | 24.60% | 22.90% | Strong - top 1% | 51 | | Power density | 246.0 | 228.6 | Strong - top 1% | 69 | | Temperature coefficient | -0.260 | -0.290 | Typical | 511 | | Weight (kg) | 39.8 kg | 38.1 kg | Strong - top 16% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 24.60% | 22.90% | Strong - top 1% | 51 | | Power density | 246.0 | 228.6 | Strong - top 1% | 69 | | Temperature coefficient | -0.260 | -0.290 | Typical | 511 | | Weight per kWp | 50.4 | 53.3 | Strong - top 16% | 3,756 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **24.60% module efficiency** - Top 1% of the 690-890 W band, against a median of 22.90%. Ranked 51st in the whole database. - **246.0 watts per square metre** - Top 1% of the 690-890 W band, against a median of 228.6. Ranked 69th in the whole database. - **50.4 kg per kWp** - Top 16% of the 690-890 W band, against a median of 53.3. - **Best for:** Utility-scale, commercial, shaded-installations and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 790 W - **Efficiency:** 24.60 % - **Voltage at Pmax (Vmp):** 49.17 V - **Current at Pmax (Imp):** 16.07 A - **Open-circuit voltage (Voc):** 59.12 V - **Short-circuit current (Isc):** 16.92 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:** 1303 mm - **Thickness:** 33 mm - **Weight:** 39.8 kg - **Area:** 3.21 m2 - **Power density:** 246.0 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 30 years ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 51 of 14005 | | Power density | 69 of 14005 | | Temperature coefficient | 511 of 14005 | | Weight | 3756 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Leading performance in the utility segment** - The series achieves an efficiency of 24.0–25.1%, which exceeds direct competitors such as Gokin GK-4-78HGBD (24.3%) and Gamko GKA210N132 (24.14%). The higher power density (up to 805 Wp) directly reduces BOS (construction, wiring, grounding) costs for a farm with the same installed power. - **ABC Technology – No losses due to electrodes** - The All-Back Contact design places all contacts on the back of the cell, eliminating shadowing caused by the front electrodes – the primary source of optical losses in conventional TOPCon/PERC modules. AIKO has maintained its position as the leading manufacturer in the TaiyangNews Top Solar Modules ranking for 34 consecutive months (data up to Q1 2026). - **Low temperature coefficient** - The Pmax coefficient is -0.26%/°C, which is significantly better than typical N-type TOPCon modules (-0.30 to -0.35%/°C). In the conditions of a typical Polish summer (module heated to 60-70°C), this translates into a real gain of several percentage points compared to the competition. - **30-year linear guarantee, with a degradation rate of 0.35% per year** - The manufacturer declares a degradation rate of less than 1% in the first year and 0.35%/year in subsequent years – one of the lowest rates on the market for utility-scale solar projects. The performance guarantee covers a full 30 years, which supports the modeling of IRR (Internal Rate of Return) for PV farm projects with longer financing horizons. - **BNEF Tier 1 – Bankability confirmed for Q1 2026** - AIKO is listed on BloombergNEF's Tier 1 PV Module Manufacturers list for Q1 2026 (confirmed participation in at least six projects >10 MW financed by independent commercial banks). Tier 1 status is a necessary condition for obtaining financing from banks and infrastructure funds. ## Cons - **The product warranty is only 15 years.** - The series offers a 15-year product warranty (for material and workmanship defects), while most leading Tier 1 manufacturers in the utility segment (JA Solar, Trina Solar, LONGi) typically provide a 25-year warranty. This could be a point of negotiation with financing banks or insurers like AXA/Munich Re, particularly for projects with a 20-25-year financing period. ## About this series The AIKO Stellar 2N+78 series introduces a new quality to the utility-scale sector, utilizing pioneering **All-Back Contact (ABC)** technology, which completely eliminates energy losses resulting from front electrode shading. By moving all contacts to the back of the cell, these panels achieve unprecedented efficiency, which directly translates into higher energy yield from a smaller installation area. A key differentiator of the series is intelligent **partial shading optimization**, which allows the module to work efficiently even in challenging location conditions where traditional solutions lose a significant portion of their power. This breakthrough approach solves the problem of performance drops caused by dirt, leaves, or terrain obstacles. The design based on N-type cells guarantees minimal annual degradation, making this series an excellent choice for **photovoltaic farms and commercial projects** focused on maximizing long-term profits. Unique **busbar-less aesthetics** go hand in hand with extreme mechanical durability, clearly distinguishing these modules from standard panels available on the market. AIKO Stellar 2N+78 is a solution for investors seeking a technological advantage and the highest power density, redefining efficiency standards in modern solar energy. ## Notable figures - At 24.6% efficiency, this panel is on par with typical \*\*Back Contact 750-800W\*\* modules - At 246.0 W/m² power density, this panel generates 4.7 W/m² more per unit area than \*\*Back Contact 750-800W\*\* median (241.3 W/m²) - At -0.26%/°C, hot weather performance is typical for \*\*Back Contact 750-800W\*\* panels - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces - In the top 0% for efficiency among all Back Contact panels ## Questions ### What is the ABC technology used in AIKO Stellar 2N+78 panels, and why is it important? ABC (All Back Contact) is a solution where all the electrodes of the module are moved to the back. The front surface is completely free of metallic contacts, eliminating shading and allowing the Stellar 2N+78 series to achieve efficiencies of up to 23.7%. In practice, this means higher energy yield from the same area compared to standard TOPCon or PERC technologies, while maintaining the same mounting area. ### What is the warranty on Aiko Stellar 2N+78 panels, and what exactly does it cover? The Stellar 2N+78 series comes with a 15-year product warranty and a 30-year power warranty. AIKO guarantees a degradation rate of less than 1% in the first year of operation and no more than 0.35% per year in subsequent years. This means maintaining over 87% of its nominal power output after three decades of operation, which is a rare achievement for large-scale modules on the Polish market. ### Are Aiko Stellar 2N+78 panels bifacial, and what is the practical energy gain achieved through this feature? Yes, the Stellar 2N+78 is a bifacial module with a dual-glass construction, meaning it has two glass surfaces. The rear glass allows for the collection of reflected light from the ground, and its bifaciality factor reaches 70%. In sunny environments, such as white gravel, concrete, or snow, the annual yield can increase by several to fifteen percent compared to a standard monofacial module with the same rated power. ### Does the AIKO Stellar 2N+78 series perform adequately under partial shading conditions on the farm? This is one of the key advantages of this series. The ABC technology eliminates losses caused by shading of the front rails, and the built-in optimization for partial shading ensures that the module operates efficiently even when part of the cells are obscured by trees, poles, or adjacent rows of panels. This results in noticeably lower production losses in challenging locations compared to typical TOPCon modules. ### How does the AIKO Stellar 2N+78 panel perform on hot, sunny days with high module temperatures? The temperature coefficient for the Stellar 2N+78 series is as low as -0.26%/°C, while standard modules have a coefficient of -0.35% to -0.40%/°C. When the module's temperature reaches 65-75°C in the summer, this difference translates into a significantly higher daily yield. For a farm with several megawatts of capacity, this can represent a substantial difference in annual energy production, particularly in warmer locations. ### Are Aiko Stellar 2N+78 panels, with a power output of 805 W, suitable for industrial rooftop installations or only for ground-mounted solar farms? The Stellar 2N+78, with a 78-cell design and a peak power output of 805 W, is primarily optimized for photovoltaic farms and large commercial or industrial installations, where its high power density and format can be fully utilized. It is well-suited for large, flat roofs of warehouses and factories. For standard residential solar installations, the manufacturer also offers smaller modules from its product range. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/965f3b034fcc77352679b433.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +15 W, +0.5 pp | | [AIKO AIKO-A800-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a800-grh78dw) | 800 W | +10 W, +0.3 pp | | [AIKO AIKO-A795-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a795-grh78dw) | 795 W | Very close match | | [Trina Solar TSM-NEG21C.20Q-760](https://comparepv.com/panel/trina-solar-tsm-neg21c-20q-760) | 760 W | -30 W, lighter | | [AIKO AIKO-A785-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a785-grh78dw) | 785 W | -0.2 pp | | [Gokin GK-4-78HGBD-780M](https://comparepv.com/panel/gokin-gk-4-78hgbd-780m) | 780 W | -10 W, lighter, -0.3 pp | | [AIKO AIKO-A780-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a780-grh78dw) | 780 W | -10 W, -0.3 pp | | [Jetion JT755SLk(B)](https://comparepv.com/panel/jetion-jt755slk-b) | 755 W | -35 W, cooler, lighter | | [Trina Solar TSM-NEG21C.20Q-755](https://comparepv.com/panel/trina-solar-tsm-neg21c-20q-755) | 755 W | -35 W, lighter, -0.3 pp | | [AIKO AIKO-A770-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a770-grh78dw) | 770 W | -20 W, -0.6 pp | | [AIKO AIKO-A775-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a775-grh78dw) | 775 W | -15 W, -0.5 pp | --- Source: https://comparepv.com/panel/aiko-aiko-a790-grh78dw 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.