--- title: "AIKO AIKO-A790-GRH78Dw vs AIKO AIKO-G665-MCH72Mw - Solar Panel Comparison | ComparePV" description: "Compare AIKO AIKO-A790-GRH78Dw vs AIKO AIKO-G665-MCH72Mw 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-a790-grh78dw/aiko-aiko-g665-mch72mw" updated: 2026-09-11 --- # AIKO AIKO-A790-GRH78Dw vs AIKO AIKO-G665-MCH72Mw 11 differences, and they point both ways The largest is rated power: 125 W more power. 7 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-A790-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a790-grh78dw) | [AIKO AIKO-G665-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g665-mch72mw) | | Manufacturer | AIKO | AIKO | | Power | 790 Wp | 665 Wp | | Efficiency | 24.60 % | 24.60 % | | Technology | Back Contact | Back Contact | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | A790-GRH78Dw | G665-MCH72Mw | Difference | | --- | --- | --- | --- | | Rated power | 790 Wp | 665 Wp | +125 W for A790-GRH78Dw | | Weight | 39.8 kg | 28.2 kg | -11.6 kg for G665-MCH72Mw | | Weight per kWp | 50.4 kg/kWp | 42.4 kg/kWp | -8.0 kg/kWp for G665-MCH72Mw | | Open-circuit voltage | 59.12 V | 54.70 V | 4.42 V apart | | Module area | 3.212 m² | 2.701 m² | 0.511 m² apart | | Short-circuit current | 16.92 A | 15.30 A | 1.62 A apart | | Cell count | 156 | 144 | 12 cells apart | | Voltage at max power | 49.17 V | 45.40 V | 3.77 V apart | | Bifacial | Yes | No | Yes vs No | | Current at max power | 16.07 A | 14.65 A | 1.42 A apart | | Dimensions | 2465x1303x33 mm | 2382x1134x33 mm | 2465x1303x33 mm vs 2382x1134x33 mm | ## Every compared parameter | Parameter | A790-GRH78Dw | G665-MCH72Mw | | --- | --- | --- | | Rated power | 790 Wp | 665 Wp | | Module efficiency | 24.60 % | 24.60 % | | Power density | 246.0 Wp/m² | 246.2 Wp/m² | | Open-circuit voltage | 59.12 V | 54.70 V | | Voltage at max power | 49.17 V | 45.40 V | | Short-circuit current | 16.92 A | 15.30 A | | Current at max power | 16.07 A | 14.65 A | | Temperature coefficient | -0.260 %/°C | -0.260 %/°C | | Dimensions | 2465x1303x33 mm | 2382x1134x33 mm | | Module area | 3.212 m² | 2.701 m² | | Weight | 39.8 kg | 28.2 kg | | Weight per kWp | 50.4 kg/kWp | 42.4 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | - | 0.35 %/yr | | Cell technology | Back Contact | Back Contact | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 156 | 144 | | Bifacial | Yes | No | ## 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, A790-GRH78Dw:** 26,506 kWh - **Cumulative output, G665-MCH72Mw:** 22,312 kWh - **Gap:** 4,194 kWh ## Output when hot | Condition | Cell temperature | A790-GRH78Dw | G665-MCH72Mw | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 790 W | 665 W | 100.0% of rated power | | Cool, bright day | 40 °C | 759 W | 639 W | 96.1% of rated power | | Typical summer roof | 55 °C | 728 W | 613 W | 92.2% of rated power | | Hot roof | 70 °C | 698 W | 587 W | 88.3% of rated power | ## Against the whole database | Measure | A790-GRH78Dw | G665-MCH72Mw | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #51 | #51 | 14,005 | Tied - the same position in the database | | Power density | #69 | #42 | 14,005 | G665-MCH72Mw leads by 27 places | | Heat behaviour | #511 | #511 | 14,005 | Tied - the same position in the database | | Weight | #3,756 | #217 | 14,005 | G665-MCH72Mw leads by 3,539 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #6 | #381 | 14,005 | A790-GRH78Dw leads by 375 places | ## Questions ### Which panel is better: AIKO AIKO-A790-GRH78Dw or AIKO AIKO-G665-MCH72Mw? According to our database: both panels are closely matched on key specs - the decision often comes down to price and local availability. See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of AIKO AIKO-A790-GRH78Dw and AIKO AIKO-G665-MCH72Mw? **AIKO AIKO-A790-GRH78Dw** has a module efficiency of **24.60%**, while **AIKO AIKO-G665-MCH72Mw** is **24.60%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does AIKO AIKO-A790-GRH78Dw use vs AIKO AIKO-G665-MCH72Mw? **AIKO AIKO-A790-GRH78Dw** uses **Back Contact** cells; **AIKO AIKO-G665-MCH72Mw** uses **Back Contact**. 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-A790-GRH78Dw and AIKO AIKO-G665-MCH72Mw? **AIKO AIKO-A790-GRH78Dw** has a **30 years** power warranty; **AIKO AIKO-G665-MCH72Mw** 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-A790-GRH78Dw and AIKO AIKO-G665-MCH72Mw bifacial panels? **AIKO AIKO-A790-GRH78Dw** is bifacial (captures light from both faces); **AIKO AIKO-G665-MCH72Mw** is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath. ## Related comparisons - [AIKO AIKO-A790-GRH78Dw vs AIKO AIKO-A805-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a790-grh78dw/aiko-aiko-a805-grh78dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A790-GRH78Dw vs AIKO AIKO-A800-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a790-grh78dw/aiko-aiko-a800-grh78dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A790-GRH78Dw vs AIKO AIKO-A795-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a790-grh78dw/aiko-aiko-a795-grh78dw) - One difference: module efficiency - [AIKO AIKO-A790-GRH78Dw vs AIKO AIKO-A785-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a790-grh78dw/aiko-aiko-a785-grh78dw) - One difference: module efficiency - [AIKO AIKO-A790-GRH78Dw vs AIKO AIKO-A780-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a790-grh78dw/aiko-aiko-a780-grh78dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A790-GRH78Dw vs AIKO AIKO-A775-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a790-grh78dw/aiko-aiko-a775-grh78dw) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/aiko-aiko-a790-grh78dw/aiko-aiko-g665-mch72mw 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.