--- title: "REC REC450AA Pure-RX vs REC REC455AA Pure-RX - Solar Panel Comparison | ComparePV" description: "Compare REC REC450AA Pure-RX vs REC REC455AA Pure-RX side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/rec-rec450aa-pure-rx-1/rec-rec455aa-pure-rx" updated: 2026-09-11 --- # REC REC450AA Pure-RX vs REC REC455AA Pure-RX REC455AA Pure-RX leads on the differences that matter The largest is module efficiency: 0.30 pp more efficient. 18 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [REC REC450AA Pure-RX](https://comparepv.com/panel/rec-rec450aa-pure-rx-1) | [REC REC455AA Pure-RX](https://comparepv.com/panel/rec-rec455aa-pure-rx) | | Manufacturer | REC | REC | | Power | 450 Wp | 455 Wp | | Efficiency | 21.60 % | 21.90 % | | Technology | HJT | HJT | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | REC450AA Pure-RX | REC455AA Pure-RX | Difference | | --- | --- | --- | --- | | Module efficiency | 21.60 % | 21.90 % | +0.30 pp for REC455AA Pure-RX | ## Every compared parameter | Parameter | REC450AA Pure-RX | REC455AA Pure-RX | | --- | --- | --- | | Rated power | 450 Wp | 455 Wp | | Module efficiency | 21.60 % | 21.90 % | | Power density | 216.1 Wp/m² | 218.5 Wp/m² | | Open-circuit voltage | 65.60 V | 65.60 V | | Voltage at max power | 54.30 V | 54.60 V | | Short-circuit current | 8.81 A | 8.84 A | | Current at max power | 8.29 A | 8.34 A | | Temperature coefficient | -0.240 %/°C | -0.240 %/°C | | Dimensions | 1728x1205x30 mm | 1728x1205x30 mm | | Module area | 2.082 m² | 2.082 m² | | Weight | 22.7 kg | 22.7 kg | | Weight per kWp | 50.4 kg/kWp | 49.9 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 | 88 | 88 | | 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, REC450AA Pure-RX:** 15,289 kWh - **Cumulative output, REC455AA Pure-RX:** 15,459 kWh - **Gap:** 170 kWh ## Output when hot | Condition | Cell temperature | REC450AA Pure-RX | REC455AA Pure-RX | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 450 W | 455 W | 100.0% of rated power | | Cool, bright day | 40 °C | 434 W | 439 W | 96.4% of rated power | | Typical summer roof | 55 °C | 418 W | 422 W | 92.8% of rated power | | Hot roof | 70 °C | 401 W | 406 W | 89.2% of rated power | ## Against the whole database | Measure | REC450AA Pure-RX | REC455AA Pure-RX | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #7,652 | #6,783 | 14,005 | REC455AA Pure-RX leads by 869 places | | Power density | #7,622 | #6,948 | 14,005 | REC455AA Pure-RX leads by 674 places | | Heat behaviour | #13 | #13 | 14,005 | Tied - the same position in the database | | Weight | #3,814 | #3,272 | 14,005 | REC455AA Pure-RX leads by 542 places | | Warranty | #9,798 | #9,798 | 14,005 | Tied - the same position in the database | | Overall | #9,417 | #8,984 | 14,005 | REC455AA Pure-RX leads by 433 places | ## Questions ### Which panel is better: REC REC450AA Pure-RX or REC REC455AA Pure-RX? According to our database: **REC REC455AA Pure-RX** has higher module efficiency (**21.90%** vs **21.60%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of REC REC450AA Pure-RX and REC REC455AA Pure-RX? **REC REC450AA Pure-RX** has a module efficiency of **21.60%**, while **REC REC455AA Pure-RX** is **21.90%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does REC REC450AA Pure-RX use vs REC REC455AA Pure-RX? **REC REC450AA Pure-RX** uses **HJT** cells; **REC REC455AA Pure-RX** 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 REC450AA Pure-RX and REC REC455AA Pure-RX? **REC REC450AA Pure-RX** has a **25 years** power warranty; **REC REC455AA Pure-RX** 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 REC450AA Pure-RX and REC REC455AA Pure-RX bifacial panels? Both **REC REC450AA Pure-RX** and **REC REC455AA Pure-RX** 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 REC450AA Pure-RX vs REC REC475AA Pure-RX](https://comparepv.com/compare/rec-rec450aa-pure-rx-1/rec-rec475aa-pure-rx) - 5 differences, the largest is module efficiency - [REC REC450AA Pure-RX vs REC REC Alpha Pure-RX 470 Wp](https://comparepv.com/compare/rec-rec450aa-pure-rx-1/rec-rec-alpha-pure-rx-470-wp) - 8 differences, the largest is module efficiency - [REC REC450AA Pure-RX vs REC REC470AA Pure-RX](https://comparepv.com/compare/rec-rec450aa-pure-rx-1/rec-rec470aa-pure-rx-1) - 5 differences, the largest is module efficiency - [REC REC450AA Pure-RX vs REC REC Alpha Pure-RX 470](https://comparepv.com/compare/rec-rec450aa-pure-rx-1/rec-rec-alpha-pure-rx-470) - 8 differences, the largest is module efficiency - [REC REC450AA Pure-RX vs REC REC465AA Pure-RX](https://comparepv.com/compare/rec-rec450aa-pure-rx-1/rec-rec465aa-pure-rx) - 3 differences, the largest is module efficiency - [REC REC450AA Pure-RX vs REC REC460AA Pure-RX](https://comparepv.com/compare/rec-rec450aa-pure-rx-1/rec-rec460aa-pure-rx-1) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/rec-rec450aa-pure-rx-1/rec-rec455aa-pure-rx 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.