--- title: "AIKO AIKO-A780-GRH78Dw vs Sharp GSD8K66H-735WT - Solar Panel Comparison | ComparePV" description: "Compare AIKO AIKO-A780-GRH78Dw vs Sharp GSD8K66H-735WT side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/aiko-aiko-a780-grh78dw/sharp-gsd8k66h-735wt" updated: 2026-09-11 --- # AIKO AIKO-A780-GRH78Dw vs Sharp GSD8K66H-735WT AIKO-A780-GRH78Dw leads on the differences that matter The largest is module efficiency: 0.64 pp more efficient. 5 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [AIKO AIKO-A780-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a780-grh78dw) | [Sharp GSD8K66H-735WT](https://comparepv.com/panel/sharp-gsd8k66h-735wt) | | Manufacturer | AIKO | Sharp | | Power | 780 Wp | 735 Wp | | Efficiency | 24.30 % | 23.66 % | | Technology | Back Contact | HJT | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | AIKO-A780-GRH78Dw | GSD8K66H-735WT | Difference | | --- | --- | --- | --- | | Module efficiency | 24.30 % | 23.66 % | +0.64 pp for AIKO-A780-GRH78Dw | | Rated power | 780 Wp | 735 Wp | +45 W for AIKO-A780-GRH78Dw | | Product warranty | 15 yrs | 25 yrs | +10 yrs for GSD8K66H-735WT | | Power density | 242.8 Wp/m² | 236.6 Wp/m² | +6.2 Wp/m² for AIKO-A780-GRH78Dw | | Open-circuit voltage | 58.92 V | 51.50 V | 7.42 V apart | | Module area | 3.212 m² | 3.106 m² | 0.106 m² apart | | Cell technology | Back Contact | HJT | Back Contact vs HJT | | Voltage at max power | 48.97 V | 43.60 V | 5.37 V apart | | Cell count | 156 | 132 | 24 cells apart | | Short-circuit current | 16.78 A | 17.72 A | 0.94 A apart | | Weight per kWp | 51.0 kg/kWp | 53.1 kg/kWp | -2.0 kg/kWp for AIKO-A780-GRH78Dw | | Dimensions | 2465x1303x33 mm | 2384x1303x35 mm | 2465x1303x33 mm vs 2384x1303x35 mm | | Current at max power | 15.93 A | 16.87 A | 0.94 A apart | ## Every compared parameter | Parameter | AIKO-A780-GRH78Dw | GSD8K66H-735WT | | --- | --- | --- | | Rated power | 780 Wp | 735 Wp | | Module efficiency | 24.30 % | 23.66 % | | Power density | 242.8 Wp/m² | 236.6 Wp/m² | | Open-circuit voltage | 58.92 V | 51.50 V | | Voltage at max power | 48.97 V | 43.60 V | | Short-circuit current | 16.78 A | 17.72 A | | Current at max power | 15.93 A | 16.87 A | | Temperature coefficient | -0.260 %/°C | -0.260 %/°C | | Dimensions | 2465x1303x33 mm | 2384x1303x35 mm | | Module area | 3.212 m² | 3.106 m² | | Weight | 39.8 kg | 39.0 kg | | Weight per kWp | 51.0 kg/kWp | 53.1 kg/kWp | | Product warranty | 15 yrs | 25 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | - | 0.35 %/yr | | Cell technology | Back Contact | HJT | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 156 | 132 | | Bifacial | Yes | Yes | ## Thirty-year yield A 1.0% first-year loss then 0.40% a year, assumed for both panels, at 1,200 kWh/kWp a year Same temp coeff. for both panels (-0.260 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other. - **Cumulative output, AIKO-A780-GRH78Dw:** 26,171 kWh - **Cumulative output, GSD8K66H-735WT:** 24,661 kWh - **Gap:** 1,510 kWh ## Output when hot | Condition | Cell temperature | AIKO-A780-GRH78Dw | GSD8K66H-735WT | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 780 W | 735 W | 100.0% of rated power | | Cool, bright day | 40 °C | 750 W | 706 W | 96.1% of rated power | | Typical summer roof | 55 °C | 719 W | 678 W | 92.2% of rated power | | Hot roof | 70 °C | 689 W | 649 W | 88.3% of rated power | ## Against the whole database | Measure | AIKO-A780-GRH78Dw | GSD8K66H-735WT | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #131 | #602 | 14,005 | AIKO-A780-GRH78Dw leads by 471 places | | Power density | #138 | #582 | 14,005 | AIKO-A780-GRH78Dw leads by 444 places | | Heat behaviour | #511 | #511 | 14,005 | Tied - the same position in the database | | Weight | #4,377 | #6,818 | 14,005 | AIKO-A780-GRH78Dw leads by 2,441 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #16 | #21 | 14,005 | AIKO-A780-GRH78Dw leads by 5 places | ## Questions ### Which panel is better: AIKO AIKO-A780-GRH78Dw or Sharp GSD8K66H-735WT? According to our database: **AIKO AIKO-A780-GRH78Dw** has higher module efficiency (**24.30%** vs **23.66%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of AIKO AIKO-A780-GRH78Dw and Sharp GSD8K66H-735WT? **AIKO AIKO-A780-GRH78Dw** has a module efficiency of **24.30%**, while **Sharp GSD8K66H-735WT** is **23.66%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does AIKO AIKO-A780-GRH78Dw use vs Sharp GSD8K66H-735WT? **AIKO AIKO-A780-GRH78Dw** uses **Back Contact** cells; **Sharp GSD8K66H-735WT** uses **HJT**. Modern **n-type** technologies (**TOPCon**, **HJT**, BC) typically deliver higher efficiency and lower degradation compared to older **PERC** (p-type) cells. ### What is the warranty on AIKO AIKO-A780-GRH78Dw and Sharp GSD8K66H-735WT? **AIKO AIKO-A780-GRH78Dw** has a **30 years** power warranty; **Sharp GSD8K66H-735WT** has a **30 years** power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80**-87%**). Product (materials) warranties are usually shorter. ### Are AIKO AIKO-A780-GRH78Dw and Sharp GSD8K66H-735WT bifacial panels? Both **AIKO AIKO-A780-GRH78Dw** and **Sharp GSD8K66H-735WT** are bifacial - they capture reflected light from the ground, which can add 5**-15%** more annual energy on ground-mount or elevated rooftop installations with a light surface beneath. ## Related comparisons - [AIKO AIKO-A780-GRH78Dw vs AIKO AIKO-A805-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a780-grh78dw/aiko-aiko-a805-grh78dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A780-GRH78Dw vs AIKO AIKO-A800-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a780-grh78dw/aiko-aiko-a800-grh78dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A780-GRH78Dw vs AIKO AIKO-A795-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a780-grh78dw/aiko-aiko-a795-grh78dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A780-GRH78Dw vs AIKO AIKO-A790-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a780-grh78dw/aiko-aiko-a790-grh78dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A780-GRH78Dw vs AIKO AIKO-A785-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a780-grh78dw/aiko-aiko-a785-grh78dw) - The same specification on paper - [AIKO AIKO-A780-GRH78Dw vs AIKO AIKO-A775-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a780-grh78dw/aiko-aiko-a775-grh78dw) - One difference: module efficiency --- Source: https://comparepv.com/compare/aiko-aiko-a780-grh78dw/sharp-gsd8k66h-735wt Not in this file, on the page: the thirty-year yield curve year by year at a cell temperature you pick and a written summary generated on request.