--- title: "AIKO AIKO-A645-MAE72Dw vs AIKO AIKO-A805-GRH78Dw - Solar Panel Comparison | ComparePV" description: "Compare AIKO AIKO-A645-MAE72Dw vs AIKO AIKO-A805-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-a645-mae72dw/aiko-aiko-a805-grh78dw" updated: 2026-09-11 --- # AIKO AIKO-A645-MAE72Dw vs AIKO AIKO-A805-GRH78Dw 10 differences, and they point both ways The largest is rated power: 160 W more power. 8 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-A645-MAE72Dw](https://comparepv.com/panel/aiko-aiko-a645-mae72dw) | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | | Manufacturer | AIKO | AIKO | | Power | 645 Wp | 805 Wp | | Efficiency | 25.00 % | 25.10 % | | Technology | Back Contact | Back Contact | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | A645-MAE72Dw | A805-GRH78Dw | Difference | | --- | --- | --- | --- | | Rated power | 645 Wp | 805 Wp | +160 W for A805-GRH78Dw | | Weight | 31.5 kg | 39.8 kg | -8.3 kg for A645-MAE72Dw | | Open-circuit voltage | 55.22 V | 59.42 V | 4.20 V apart | | Short-circuit current | 14.86 A | 17.13 A | 2.27 A apart | | Module area | 2.583 m² | 3.212 m² | 0.629 m² apart | | Current at max power | 14.12 A | 16.28 A | 2.16 A apart | | Cell count | 144 | 156 | 12 cells apart | | Voltage at max power | 45.70 V | 49.46 V | 3.76 V apart | | Bifacial | No | Yes | No vs Yes | | Dimensions | 2278x1134x30 mm | 2465x1303x33 mm | 2278x1134x30 mm vs 2465x1303x33 mm | ## Every compared parameter | Parameter | A645-MAE72Dw | A805-GRH78Dw | | --- | --- | --- | | Rated power | 645 Wp | 805 Wp | | Module efficiency | 25.00 % | 25.10 % | | Power density | 249.7 Wp/m² | 250.6 Wp/m² | | Open-circuit voltage | 55.22 V | 59.42 V | | Voltage at max power | 45.70 V | 49.46 V | | Short-circuit current | 14.86 A | 17.13 A | | Current at max power | 14.12 A | 16.28 A | | Temperature coefficient | -0.260 %/°C | -0.260 %/°C | | Dimensions | 2278x1134x30 mm | 2465x1303x33 mm | | Module area | 2.583 m² | 3.212 m² | | Weight | 31.5 kg | 39.8 kg | | Weight per kWp | 48.8 kg/kWp | 49.4 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 | 144 | 156 | | Bifacial | No | 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, A645-MAE72Dw:** 21,641 kWh - **Cumulative output, A805-GRH78Dw:** 27,009 kWh - **Gap:** 5,368 kWh ## Output when hot | Condition | Cell temperature | A645-MAE72Dw | A805-GRH78Dw | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 645 W | 805 W | 100.0% of rated power | | Cool, bright day | 40 °C | 620 W | 774 W | 96.1% of rated power | | Typical summer roof | 55 °C | 595 W | 742 W | 92.2% of rated power | | Hot roof | 70 °C | 570 W | 711 W | 88.3% of rated power | ## Against the whole database | Measure | A645-MAE72Dw | A805-GRH78Dw | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #4 | #3 | 14,005 | A805-GRH78Dw leads by 1 place | | Power density | #8 | #3 | 14,005 | A805-GRH78Dw leads by 5 places | | Heat behaviour | #511 | #511 | 14,005 | Tied - the same position in the database | | Weight | #2,492 | #2,977 | 14,005 | A645-MAE72Dw leads by 485 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #493 | #1 | 14,005 | A805-GRH78Dw leads by 492 places | ## Questions ### Which panel is better: AIKO AIKO-A645-MAE72Dw or AIKO AIKO-A805-GRH78Dw? According to our database: **AIKO AIKO-A805-GRH78Dw** has higher module efficiency (**25.10%** vs **25.00%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of AIKO AIKO-A645-MAE72Dw and AIKO AIKO-A805-GRH78Dw? **AIKO AIKO-A645-MAE72Dw** has a module efficiency of **25.00%**, while **AIKO AIKO-A805-GRH78Dw** is **25.10%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does AIKO AIKO-A645-MAE72Dw use vs AIKO AIKO-A805-GRH78Dw? **AIKO AIKO-A645-MAE72Dw** uses **Back Contact** cells; **AIKO AIKO-A805-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-A645-MAE72Dw and AIKO AIKO-A805-GRH78Dw? **AIKO AIKO-A645-MAE72Dw** has a **30 years** power warranty; **AIKO AIKO-A805-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-A645-MAE72Dw and AIKO AIKO-A805-GRH78Dw bifacial panels? **AIKO AIKO-A805-GRH78Dw** is bifacial (captures light from both faces); **AIKO AIKO-A645-MAE72Dw** is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath. ## Related comparisons - [AIKO AIKO-A645-MAE72Dw vs AIKO AIKO-A640-MAE72Dw](https://comparepv.com/compare/aiko-aiko-a645-mae72dw/aiko-aiko-a640-mae72dw) - One difference: module efficiency - [AIKO AIKO-A645-MAE72Dw vs AIKO AIKO-A635-MAE72Dw](https://comparepv.com/compare/aiko-aiko-a645-mae72dw/aiko-aiko-a635-mae72dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A645-MAE72Dw vs AIKO AIKO-A630-MAE72Dw](https://comparepv.com/compare/aiko-aiko-a645-mae72dw/aiko-aiko-a630-mae72dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A645-MAE72Dw vs AIKO AIKO-A625-MAE72Dw](https://comparepv.com/compare/aiko-aiko-a645-mae72dw/aiko-aiko-a625-mae72dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A645-MAE72Dw vs AIKO AIKO-A620-MAE72Dw](https://comparepv.com/compare/aiko-aiko-a645-mae72dw/aiko-aiko-a620-mae72dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A805-GRH78Dw vs AIKO AIKO-A800-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a805-grh78dw/aiko-aiko-a800-grh78dw) - One difference: module efficiency --- Source: https://comparepv.com/compare/aiko-aiko-a645-mae72dw/aiko-aiko-a805-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.