--- title: "AIKO AIKO-G635-MCH72Dw vs AIKO AIKO-G640-MCH72Dw - Solar Panel Comparison | ComparePV" description: "Compare AIKO AIKO-G635-MCH72Dw vs AIKO AIKO-G640-MCH72Dw 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-g635-mch72dw/aiko-aiko-g640-mch72dw" updated: 2026-09-11 --- # AIKO AIKO-G635-MCH72Dw vs AIKO AIKO-G640-MCH72Dw G640-MCH72Dw 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-G635-MCH72Dw](https://comparepv.com/panel/aiko-aiko-g635-mch72dw) | [AIKO AIKO-G640-MCH72Dw](https://comparepv.com/panel/aiko-aiko-g640-mch72dw) | | Manufacturer | AIKO | AIKO | | Power | 635 Wp | 640 Wp | | Efficiency | 23.50 % | 23.70 % | | Technology | Back Contact | Back Contact | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | G635-MCH72Dw | G640-MCH72Dw | Difference | | --- | --- | --- | --- | | Module efficiency | 23.50 % | 23.70 % | +0.20 pp for G640-MCH72Dw | ## Every compared parameter | Parameter | G635-MCH72Dw | G640-MCH72Dw | | --- | --- | --- | | Rated power | 635 Wp | 640 Wp | | Module efficiency | 23.50 % | 23.70 % | | Power density | 235.1 Wp/m² | 236.9 Wp/m² | | Open-circuit voltage | 54.70 V | 53.80 V | | Voltage at max power | 45.00 V | 45.10 V | | Short-circuit current | 14.88 A | 14.94 A | | Current at max power | 14.12 A | 14.20 A | | Temperature coefficient | -0.260 %/°C | -0.260 %/°C | | Dimensions | 2382x1134x30 mm | 2382x1134x30 mm | | Module area | 2.701 m² | 2.701 m² | | Weight | 33.5 kg | 33.5 kg | | Weight per kWp | 52.8 kg/kWp | 52.3 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 | Yes | Yes | ## 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, G635-MCH72Dw:** 21,471 kWh - **Cumulative output, G640-MCH72Dw:** 21,640 kWh - **Gap:** 169 kWh ## Output when hot | Condition | Cell temperature | G635-MCH72Dw | G640-MCH72Dw | 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 | G635-MCH72Dw | G640-MCH72Dw | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #716 | #517 | 14,005 | G640-MCH72Dw leads by 199 places | | Power density | #741 | #521 | 14,005 | G640-MCH72Dw leads by 220 places | | Heat behaviour | #511 | #511 | 14,005 | Tied - the same position in the database | | Weight | #6,429 | #5,829 | 14,005 | G640-MCH72Dw leads by 600 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #1,462 | #1,271 | 14,005 | G640-MCH72Dw leads by 191 places | ## Questions ### Which panel is better: AIKO AIKO-G635-MCH72Dw or AIKO AIKO-G640-MCH72Dw? According to our database: **AIKO AIKO-G640-MCH72Dw** has higher module efficiency (**23.70%** vs **23.50%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of AIKO AIKO-G635-MCH72Dw and AIKO AIKO-G640-MCH72Dw? **AIKO AIKO-G635-MCH72Dw** has a module efficiency of **23.50%**, while **AIKO AIKO-G640-MCH72Dw** is **23.70%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does AIKO AIKO-G635-MCH72Dw use vs AIKO AIKO-G640-MCH72Dw? **AIKO AIKO-G635-MCH72Dw** uses **Back Contact** cells; **AIKO AIKO-G640-MCH72Dw** 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-G635-MCH72Dw and AIKO AIKO-G640-MCH72Dw? **AIKO AIKO-G635-MCH72Dw** has a **30 years** power warranty; **AIKO AIKO-G640-MCH72Dw** 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-G635-MCH72Dw and AIKO AIKO-G640-MCH72Dw bifacial panels? Both **AIKO AIKO-G635-MCH72Dw** and **AIKO AIKO-G640-MCH72Dw** 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-G635-MCH72Dw vs AIKO AIKO-G660-MCH72Dw](https://comparepv.com/compare/aiko-aiko-g635-mch72dw/aiko-aiko-g660-mch72dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-G635-MCH72Dw vs AIKO AIKO-G655-MCH72Dw](https://comparepv.com/compare/aiko-aiko-g635-mch72dw/aiko-aiko-g655-mch72dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-G635-MCH72Dw vs AIKO AIKO-G650-MCH72Dw](https://comparepv.com/compare/aiko-aiko-g635-mch72dw/aiko-aiko-g650-mch72dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-G635-MCH72Dw vs AIKO AIKO-G645-MCH72Dw](https://comparepv.com/compare/aiko-aiko-g635-mch72dw/aiko-aiko-g645-mch72dw) - 3 differences, the largest is module efficiency - [AIKO AIKO-G635-MCH72Dw vs AIKO AIKO-A805-GRH78Dw](https://comparepv.com/compare/aiko-aiko-g635-mch72dw/aiko-aiko-a805-grh78dw) - 12 differences, the largest is module efficiency - [AIKO AIKO-G635-MCH72Dw vs AIKO AIKO-A800-GRH78Dw](https://comparepv.com/compare/aiko-aiko-g635-mch72dw/aiko-aiko-a800-grh78dw) - 12 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/aiko-aiko-g635-mch72dw/aiko-aiko-g640-mch72dw 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.