--- title: "AIKO AIKO-A635-MAE72Dw vs AIKO AIKO-A640-MAE72Dw - Solar Panel Comparison | ComparePV" description: "Compare AIKO AIKO-A635-MAE72Dw vs AIKO AIKO-A640-MAE72Dw 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-a635-mae72dw/aiko-aiko-a640-mae72dw" updated: 2026-09-11 --- # AIKO AIKO-A635-MAE72Dw vs AIKO AIKO-A640-MAE72Dw A640-MAE72Dw leads on the differences that matter The largest is module efficiency: 0.20 pp more efficient. 18 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [AIKO AIKO-A635-MAE72Dw](https://comparepv.com/panel/aiko-aiko-a635-mae72dw) | [AIKO AIKO-A640-MAE72Dw](https://comparepv.com/panel/aiko-aiko-a640-mae72dw) | | Manufacturer | AIKO | AIKO | | Power | 635 Wp | 640 Wp | | Efficiency | 24.60 % | 24.80 % | | Technology | Back Contact | Back Contact | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | A635-MAE72Dw | A640-MAE72Dw | Difference | | --- | --- | --- | --- | | Module efficiency | 24.60 % | 24.80 % | +0.20 pp for A640-MAE72Dw | ## Every compared parameter | Parameter | A635-MAE72Dw | A640-MAE72Dw | | --- | --- | --- | | Rated power | 635 Wp | 640 Wp | | Module efficiency | 24.60 % | 24.80 % | | Power density | 245.8 Wp/m² | 247.7 Wp/m² | | Open-circuit voltage | 54.96 V | 55.09 V | | Voltage at max power | 45.50 V | 45.60 V | | Short-circuit current | 14.70 A | 14.78 A | | Current at max power | 13.96 A | 14.04 A | | Temperature coefficient | -0.260 %/°C | -0.260 %/°C | | Dimensions | 2278x1134x30 mm | 2278x1134x30 mm | | Module area | 2.583 m² | 2.583 m² | | Weight | 31.5 kg | 31.5 kg | | Weight per kWp | 49.6 kg/kWp | 49.2 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.35 %/yr | 0.35 %/yr | | Cell technology | Back Contact | Back Contact | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 144 | 144 | | Bifacial | No | No | ## Thirty-year yield Each panel's own declared degradation curve, 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, A635-MAE72Dw:** 21,471 kWh - **Cumulative output, A640-MAE72Dw:** 21,640 kWh - **Gap:** 169 kWh ## Output when hot | Condition | Cell temperature | A635-MAE72Dw | A640-MAE72Dw | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 635 W | 640 W | 100.0% of rated power | | Cool, bright day | 40 °C | 610 W | 615 W | 96.1% of rated power | | Typical summer roof | 55 °C | 585 W | 590 W | 92.2% of rated power | | Hot roof | 70 °C | 561 W | 565 W | 88.3% of rated power | ## Against the whole database | Measure | A635-MAE72Dw | A640-MAE72Dw | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #51 | #12 | 14,005 | A640-MAE72Dw leads by 39 places | | Power density | #72 | #35 | 14,005 | A640-MAE72Dw leads by 37 places | | Heat behaviour | #511 | #511 | 14,005 | Tied - the same position in the database | | Weight | #3,152 | #2,805 | 14,005 | A640-MAE72Dw leads by 347 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #838 | #647 | 14,005 | A640-MAE72Dw leads by 191 places | ## Questions ### Which panel is better: AIKO AIKO-A635-MAE72Dw or AIKO AIKO-A640-MAE72Dw? According to our database: **AIKO AIKO-A640-MAE72Dw** has higher module efficiency (**24.80%** vs **24.60%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of AIKO AIKO-A635-MAE72Dw and AIKO AIKO-A640-MAE72Dw? **AIKO AIKO-A635-MAE72Dw** has a module efficiency of **24.60%**, while **AIKO AIKO-A640-MAE72Dw** is **24.80%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does AIKO AIKO-A635-MAE72Dw use vs AIKO AIKO-A640-MAE72Dw? **AIKO AIKO-A635-MAE72Dw** uses **Back Contact** cells; **AIKO AIKO-A640-MAE72Dw** 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-A635-MAE72Dw and AIKO AIKO-A640-MAE72Dw? **AIKO AIKO-A635-MAE72Dw** has a **30 years** power warranty; **AIKO AIKO-A640-MAE72Dw** 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. ## Related comparisons - [AIKO AIKO-A635-MAE72Dw vs AIKO AIKO-A645-MAE72Dw](https://comparepv.com/compare/aiko-aiko-a635-mae72dw/aiko-aiko-a645-mae72dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A635-MAE72Dw vs AIKO AIKO-A630-MAE72Dw](https://comparepv.com/compare/aiko-aiko-a635-mae72dw/aiko-aiko-a630-mae72dw) - One difference: module efficiency - [AIKO AIKO-A635-MAE72Dw vs AIKO AIKO-A625-MAE72Dw](https://comparepv.com/compare/aiko-aiko-a635-mae72dw/aiko-aiko-a625-mae72dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A635-MAE72Dw vs AIKO AIKO-A620-MAE72Dw](https://comparepv.com/compare/aiko-aiko-a635-mae72dw/aiko-aiko-a620-mae72dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-A635-MAE72Dw vs AIKO AIKO-A805-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a635-mae72dw/aiko-aiko-a805-grh78dw) - 12 differences, the largest is rated power - [AIKO AIKO-A635-MAE72Dw vs AIKO AIKO-A800-GRH78Dw](https://comparepv.com/compare/aiko-aiko-a635-mae72dw/aiko-aiko-a800-grh78dw) - 12 differences, the largest is rated power --- Source: https://comparepv.com/compare/aiko-aiko-a635-mae72dw/aiko-aiko-a640-mae72dw 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.