--- title: "AIKO AIKO-A770-GRH78Dw vs AIKO AIKO-A775-GRH78Dw - Solar Panel Comparison | ComparePV" description: "Compare AIKO AIKO-A770-GRH78Dw vs AIKO AIKO-A775-GRH78Dw 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-a770-grh78dw/aiko-aiko-a775-grh78dw" updated: 2026-09-11 --- # AIKO AIKO-A770-GRH78Dw vs AIKO AIKO-A775-GRH78Dw Identical on every published parameter All 18 comparable parameters agree, with 1 more left out because at least one datasheet does not publish it. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [AIKO AIKO-A770-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a770-grh78dw) | [AIKO AIKO-A775-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a775-grh78dw) | | Manufacturer | AIKO | AIKO | | Power | 770 Wp | 775 Wp | | Efficiency | 24.00 % | 24.10 % | | Technology | Back Contact | Back Contact | ## Every compared parameter | Parameter | A770-GRH78Dw | A775-GRH78Dw | | --- | --- | --- | | Rated power | 770 Wp | 775 Wp | | Module efficiency | 24.00 % | 24.10 % | | Power density | 239.7 Wp/m² | 241.3 Wp/m² | | Open-circuit voltage | 58.72 V | 58.82 V | | Voltage at max power | 48.77 V | 48.87 V | | Short-circuit current | 16.64 A | 16.71 A | | Current at max power | 15.79 A | 15.86 A | | Temperature coefficient | -0.260 %/°C | -0.260 %/°C | | Dimensions | 2465x1303x33 mm | 2465x1303x33 mm | | Module area | 3.212 m² | 3.212 m² | | Weight | 39.8 kg | 39.8 kg | | Weight per kWp | 51.7 kg/kWp | 51.4 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | - | - | | Cell technology | Back Contact | Back Contact | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 156 | 156 | | 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, A770-GRH78Dw:** 25,835 kWh - **Cumulative output, A775-GRH78Dw:** 26,003 kWh - **Gap:** 168 kWh ## Output when hot | Condition | Cell temperature | A770-GRH78Dw | A775-GRH78Dw | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 770 W | 775 W | 100.0% of rated power | | Cool, bright day | 40 °C | 740 W | 745 W | 96.1% of rated power | | Typical summer roof | 55 °C | 710 W | 715 W | 92.2% of rated power | | Hot roof | 70 °C | 680 W | 684 W | 88.3% of rated power | ## Against the whole database | Measure | A770-GRH78Dw | A775-GRH78Dw | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #303 | #219 | 14,005 | A775-GRH78Dw leads by 84 places | | Power density | #347 | #227 | 14,005 | A775-GRH78Dw leads by 120 places | | Heat behaviour | #511 | #511 | 14,005 | Tied - the same position in the database | | Weight | #5,072 | #4,724 | 14,005 | A775-GRH78Dw leads by 348 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #40 | #30 | 14,005 | A775-GRH78Dw leads by 10 places | ## Questions ### Which panel is better: AIKO AIKO-A770-GRH78Dw or AIKO AIKO-A775-GRH78Dw? According to our database: **AIKO AIKO-A775-GRH78Dw** has higher module efficiency (**24.10%** vs **24.00%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of AIKO AIKO-A770-GRH78Dw and AIKO AIKO-A775-GRH78Dw? **AIKO AIKO-A770-GRH78Dw** has a module efficiency of **24.00%**, while **AIKO AIKO-A775-GRH78Dw** is **24.10%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does AIKO AIKO-A770-GRH78Dw use vs AIKO AIKO-A775-GRH78Dw? **AIKO AIKO-A770-GRH78Dw** uses **Back Contact** cells; **AIKO AIKO-A775-GRH78Dw** 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-A770-GRH78Dw and AIKO AIKO-A775-GRH78Dw? **AIKO AIKO-A770-GRH78Dw** has a **30 years** power warranty; **AIKO AIKO-A775-GRH78Dw** 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-A770-GRH78Dw and AIKO AIKO-A775-GRH78Dw bifacial panels? Both **AIKO AIKO-A770-GRH78Dw** and **AIKO AIKO-A775-GRH78Dw** 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-A770-GRH78Dw vs AIKO AIKO-A805-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a770-grh78dw/aiko-aiko-a805-grh78dw) - 4 differences, the largest is module efficiency - [AIKO AIKO-A770-GRH78Dw vs AIKO AIKO-A800-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a770-grh78dw/aiko-aiko-a800-grh78dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A770-GRH78Dw vs AIKO AIKO-A795-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a770-grh78dw/aiko-aiko-a795-grh78dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A770-GRH78Dw vs AIKO AIKO-A790-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a770-grh78dw/aiko-aiko-a790-grh78dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A770-GRH78Dw vs AIKO AIKO-A785-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a770-grh78dw/aiko-aiko-a785-grh78dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A770-GRH78Dw vs AIKO AIKO-A780-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a770-grh78dw/aiko-aiko-a780-grh78dw) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/aiko-aiko-a770-grh78dw/aiko-aiko-a775-grh78dw 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.