--- title: "REC REC600AA Pro MG vs REC REC620AA Pro MG - Solar Panel Comparison | ComparePV" description: "Compare REC REC600AA Pro MG vs REC REC620AA Pro MG side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/rec-rec600aa-pro-mg/rec-rec620aa-pro-mg" updated: 2026-09-11 --- # REC REC600AA Pro MG vs REC REC620AA Pro MG REC620AA Pro MG leads on the differences that matter The largest is module efficiency: 0.70 pp more efficient. 16 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [REC REC600AA Pro MG](https://comparepv.com/panel/rec-rec600aa-pro-mg) | [REC REC620AA Pro MG](https://comparepv.com/panel/rec-rec620aa-pro-mg) | | Manufacturer | REC | REC | | Power | 600 Wp | 620 Wp | | Efficiency | 21.10 % | 21.80 % | | Technology | HJT | HJT | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | REC600AA Pro MG | REC620AA Pro MG | Difference | | --- | --- | --- | --- | | Module efficiency | 21.10 % | 21.80 % | +0.70 pp for REC620AA Pro MG | | Power density | 211.4 Wp/m² | 218.4 Wp/m² | +7.0 Wp/m² for REC620AA Pro MG | | Rated power | 600 Wp | 620 Wp | +20 W for REC620AA Pro MG | ## Every compared parameter | Parameter | REC600AA Pro MG | REC620AA Pro MG | | --- | --- | --- | | Rated power | 600 Wp | 620 Wp | | Module efficiency | 21.10 % | 21.80 % | | Power density | 211.4 Wp/m² | 218.4 Wp/m² | | Open-circuit voltage | 44.20 V | 44.60 V | | Voltage at max power | 36.00 V | 36.60 V | | Short-circuit current | 17.45 A | 17.67 A | | Current at max power | 16.67 A | 16.94 A | | Temperature coefficient | -0.240 %/°C | -0.240 %/°C | | Dimensions | 2175x1305x30 mm | 2175x1305x30 mm | | Module area | 2.838 m² | 2.838 m² | | Weight | 36.8 kg | 36.8 kg | | Weight per kWp | 61.3 kg/kWp | 59.4 kg/kWp | | Product warranty | 30 yrs | 30 yrs | | Performance warranty | 30 yrs | 30 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, REC600AA Pro MG:** 20,385 kWh - **Cumulative output, REC620AA Pro MG:** 21,065 kWh - **Gap:** 680 kWh ## Output when hot | Condition | Cell temperature | REC600AA Pro MG | REC620AA Pro MG | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 600 W | 620 W | 100.0% of rated power | | Cool, bright day | 40 °C | 578 W | 598 W | 96.4% of rated power | | Typical summer roof | 55 °C | 557 W | 575 W | 92.8% of rated power | | Hot roof | 70 °C | 535 W | 553 W | 89.2% of rated power | ## Against the whole database | Measure | REC600AA Pro MG | REC620AA Pro MG | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #9,297 | #7,022 | 14,005 | REC620AA Pro MG leads by 2,275 places | | Power density | #9,213 | #6,952 | 14,005 | REC620AA Pro MG leads by 2,261 places | | Heat behaviour | #13 | #13 | 14,005 | Tied - the same position in the database | | Weight | #12,630 | #12,117 | 14,005 | REC620AA Pro MG leads by 513 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #1,962 | #1,182 | 14,005 | REC620AA Pro MG leads by 780 places | ## Questions ### Which panel is better: REC REC600AA Pro MG or REC REC620AA Pro MG? According to our database: **REC REC620AA Pro MG** has higher module efficiency (**21.80%** vs **21.10%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of REC REC600AA Pro MG and REC REC620AA Pro MG? **REC REC600AA Pro MG** has a module efficiency of **21.10%**, while **REC REC620AA Pro MG** is **21.80%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does REC REC600AA Pro MG use vs REC REC620AA Pro MG? **REC REC600AA Pro MG** uses **HJT** cells; **REC REC620AA Pro MG** 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 REC600AA Pro MG and REC REC620AA Pro MG? **REC REC600AA Pro MG** has a **30 years** power warranty; **REC REC620AA Pro MG** 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 REC REC600AA Pro MG and REC REC620AA Pro MG bifacial panels? Both **REC REC600AA Pro MG** and **REC REC620AA Pro MG** 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 REC600AA Pro MG vs REC REC640AA Pro MG](https://comparepv.com/compare/rec-rec600aa-pro-mg/rec-rec640aa-pro-mg) - 6 differences, the largest is module efficiency - [REC REC600AA Pro MG vs REC REC630AA Pro MG](https://comparepv.com/compare/rec-rec600aa-pro-mg/rec-rec630aa-pro-mg) - 4 differences, the largest is module efficiency - [REC REC600AA Pro MG vs REC REC610AA Pro MG](https://comparepv.com/compare/rec-rec600aa-pro-mg/rec-rec610aa-pro-mg) - 3 differences, the largest is module efficiency - [REC REC600AA Pro MG vs REC REC590AA Pro MG](https://comparepv.com/compare/rec-rec600aa-pro-mg/rec-rec590aa-pro-mg) - 3 differences, the largest is module efficiency - [REC REC600AA Pro MG vs REC REC640AA PRO M](https://comparepv.com/compare/rec-rec600aa-pro-mg/rec-rec640aa-pro-m) - 9 differences, the largest is module efficiency - [REC REC600AA Pro MG vs REC REC630AA PRO M](https://comparepv.com/compare/rec-rec600aa-pro-mg/rec-rec630aa-pro-m) - 7 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/rec-rec600aa-pro-mg/rec-rec620aa-pro-mg 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.