--- title: "REC REC630AA PRO M vs REC REC640AA PRO M - Solar Panel Comparison | ComparePV" description: "Compare REC REC630AA PRO M vs REC REC640AA PRO M side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/rec-rec630aa-pro-m/rec-rec640aa-pro-m" updated: 2026-09-11 --- # REC REC630AA PRO M vs REC REC640AA PRO M REC640AA PRO M leads on the differences that matter The largest is module efficiency: 0.30 pp more efficient. 16 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [REC REC630AA PRO M](https://comparepv.com/panel/rec-rec630aa-pro-m) | [REC REC640AA PRO M](https://comparepv.com/panel/rec-rec640aa-pro-m) | | Manufacturer | REC | REC | | Power | 630 Wp | 640 Wp | | Efficiency | 22.20 % | 22.50 % | | Technology | HJT | HJT | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | REC630AA PRO M | REC640AA PRO M | Difference | | --- | --- | --- | --- | | Module efficiency | 22.20 % | 22.50 % | +0.30 pp for REC640AA PRO M | | Power density | 222.0 Wp/m² | 225.5 Wp/m² | +3.5 Wp/m² for REC640AA PRO M | | Rated power | 630 Wp | 640 Wp | +10 W for REC640AA PRO M | ## Every compared parameter | Parameter | REC630AA PRO M | REC640AA PRO M | | --- | --- | --- | | Rated power | 630 Wp | 640 Wp | | Module efficiency | 22.20 % | 22.50 % | | Power density | 222.0 Wp/m² | 225.5 Wp/m² | | Open-circuit voltage | 44.50 V | 44.60 V | | Voltage at max power | 36.80 V | 37.10 V | | Short-circuit current | 17.86 A | 17.93 A | | Current at max power | 17.12 A | 17.26 A | | Temperature coefficient | -0.240 %/°C | -0.240 %/°C | | Dimensions | 2175x1305x30 mm | 2175x1305x30 mm | | Module area | 2.838 m² | 2.838 m² | | Weight | 32.5 kg | 32.5 kg | | Weight per kWp | 51.6 kg/kWp | 50.8 kg/kWp | | Product warranty | 20 yrs | 20 yrs | | Performance warranty | 25 yrs | 25 yrs | | Annual degradation | 0.25 %/yr | 0.25 %/yr | | Cell technology | HJT | HJT | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 120 | 120 | | 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 (-0.240 %/°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, REC630AA PRO M:** 21,404 kWh - **Cumulative output, REC640AA PRO M:** 21,744 kWh - **Gap:** 340 kWh ## Output when hot | Condition | Cell temperature | REC630AA PRO M | REC640AA PRO M | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 630 W | 640 W | 100.0% of rated power | | Cool, bright day | 40 °C | 607 W | 617 W | 96.4% of rated power | | Typical summer roof | 55 °C | 585 W | 594 W | 92.8% of rated power | | Hot roof | 70 °C | 562 W | 571 W | 89.2% of rated power | ## Against the whole database | Measure | REC630AA PRO M | REC640AA PRO M | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #5,817 | #4,222 | 14,005 | REC640AA PRO M leads by 1,595 places | | Power density | #5,856 | #3,889 | 14,005 | REC640AA PRO M leads by 1,967 places | | Heat behaviour | #13 | #13 | 14,005 | Tied - the same position in the database | | Weight | #4,960 | #4,196 | 14,005 | REC640AA PRO M leads by 764 places | | Warranty | #9,798 | #9,798 | 14,005 | Tied - the same position in the database | | Overall | #2,470 | #1,949 | 14,005 | REC640AA PRO M leads by 521 places | ## Questions ### Which panel is better: REC REC630AA PRO M or REC REC640AA PRO M? According to our database: **REC REC640AA PRO M** has higher module efficiency (**22.50%** vs **22.20%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of REC REC630AA PRO M and REC REC640AA PRO M? **REC REC630AA PRO M** has a module efficiency of **22.20%**, while **REC REC640AA PRO M** is **22.50%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does REC REC630AA PRO M use vs REC REC640AA PRO M? **REC REC630AA PRO M** uses **HJT** cells; **REC REC640AA PRO M** uses **HJT**. 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 REC REC630AA PRO M and REC REC640AA PRO M? **REC REC630AA PRO M** has a **25 years** power warranty; **REC REC640AA PRO M** has a **25 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 REC REC630AA PRO M and REC REC640AA PRO M bifacial panels? Both **REC REC630AA PRO M** and **REC REC640AA PRO M** 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 - [REC REC630AA PRO M vs REC REC620AA PRO M](https://comparepv.com/compare/rec-rec630aa-pro-m/rec-rec620aa-pro-m) - 3 differences, the largest is module efficiency - [REC REC630AA PRO M vs REC REC610AA PRO M](https://comparepv.com/compare/rec-rec630aa-pro-m/rec-rec610aa-pro-m) - 3 differences, the largest is module efficiency - [REC REC630AA PRO M vs REC REC600AA PRO M](https://comparepv.com/compare/rec-rec630aa-pro-m/rec-rec600aa-pro-m) - 4 differences, the largest is module efficiency - [REC REC630AA PRO M vs REC REC640AA Pro MG](https://comparepv.com/compare/rec-rec630aa-pro-m/rec-rec640aa-pro-mg) - 7 differences, the largest is performance warranty - [REC REC630AA PRO M vs REC REC630AA Pro MG](https://comparepv.com/compare/rec-rec630aa-pro-m/rec-rec630aa-pro-mg) - 4 differences, the largest is performance warranty - [REC REC630AA PRO M vs REC REC620AA Pro MG](https://comparepv.com/compare/rec-rec630aa-pro-m/rec-rec620aa-pro-mg) - 7 differences, the largest is performance warranty --- Source: https://comparepv.com/compare/rec-rec630aa-pro-m/rec-rec640aa-pro-m 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.