--- title: "Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 vs Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 595 - Solar Panel Comparison | ComparePV" description: "Compare Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 vs Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 595 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-585/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-595" updated: 2026-09-11 --- # Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 vs Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 595 595 leads on the differences that matter The largest is module efficiency: 0.30 pp more efficient. 15 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585](https://comparepv.com/panel/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-585) | [Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 595](https://comparepv.com/panel/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-595) | | Manufacturer | Q-Cells | Q-Cells | | Power | 585 Wp | 595 Wp | | Efficiency | 21.00 % | 21.30 % | | Technology | PERC | PERC | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 585 | 595 | Difference | | --- | --- | --- | --- | | Module efficiency | 21.00 % | 21.30 % | +0.30 pp for 595 | | Power density | 209.5 Wp/m² | 213.1 Wp/m² | +3.6 Wp/m² for 595 | | Rated power | 585 Wp | 595 Wp | +10 W for 595 | ## Every compared parameter | Parameter | 585 | 595 | | --- | --- | --- | | Rated power | 585 Wp | 595 Wp | | Module efficiency | 21.00 % | 21.30 % | | Power density | 209.5 Wp/m² | 213.1 Wp/m² | | Open-circuit voltage | 53.57 V | 53.63 V | | Voltage at max power | 44.75 V | 45.18 V | | Short-circuit current | 13.72 A | 13.77 A | | Current at max power | 13.07 A | 13.17 A | | Temperature coefficient | -0.340 %/°C | -0.340 %/°C | | Dimensions | 2462x1134x35 mm | 2462x1134x35 mm | | Module area | 2.792 m² | 2.792 m² | | Weight | 36.4 kg | 36.4 kg | | Weight per kWp | 62.2 kg/kWp | 61.2 kg/kWp | | Product warranty | - | - | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.45 %/yr | 0.45 %/yr | | Cell technology | PERC | PERC | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 156 | 156 | | 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 (-0.340 %/°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, 585:** 19,265 kWh - **Cumulative output, 595:** 19,594 kWh - **Gap:** 329 kWh ## Output when hot | Condition | Cell temperature | 585 | 595 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 585 W | 595 W | 100.0% of rated power | | Cool, bright day | 40 °C | 555 W | 565 W | 94.9% of rated power | | Typical summer roof | 55 °C | 525 W | 534 W | 89.8% of rated power | | Hot roof | 70 °C | 495 W | 504 W | 84.7% of rated power | ## Against the whole database | Measure | 585 | 595 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #9,758 | #8,519 | 14,005 | 595 leads by 1,239 places | | Power density | #9,941 | #8,470 | 14,005 | 595 leads by 1,471 places | | Heat behaviour | #8,778 | #8,778 | 14,005 | Tied - the same position in the database | | Weight | #12,754 | #12,610 | 14,005 | 595 leads by 144 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #8,794 | #8,061 | 14,005 | 595 leads by 733 places | ## Questions ### Which panel is better: Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 or Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 595? According to our database: **Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 595** has higher module efficiency (**21.30%** vs **21.00%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 and Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 595? **Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585** has a module efficiency of **21.00%**, while **Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 595** is **21.30%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 use vs Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 595? **Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585** uses **PERC** cells; **Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 595** uses **PERC**. 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 Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 and Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 595? **Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585** has a **30 years** power warranty; **Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 595** 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 Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 and Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 595 bifacial panels? Both **Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585** and **Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 595** 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 - [Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 vs Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 600](https://comparepv.com/compare/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-585/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-600) - 3 differences, the largest is module efficiency - [Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 vs Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 590](https://comparepv.com/compare/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-585/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-590) - The same specification on paper - [Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 675](https://comparepv.com/compare/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-585/q-cells-q-peak-duo-ml-g12s-3-bfg-675) - 12 differences, the largest is module efficiency - [Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 670](https://comparepv.com/compare/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-585/q-cells-q-peak-duo-ml-g12s-3-bfg-670) - 12 differences, the largest is rated power - [Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 665](https://comparepv.com/compare/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-585/q-cells-q-peak-duo-ml-g12s-3-bfg-665) - 12 differences, the largest is rated power - [Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585 vs Q-Cells Q.PEAK DUO ML-G12S.3 / BFG 660](https://comparepv.com/compare/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-585/q-cells-q-peak-duo-ml-g12s-3-bfg-660) - 11 differences, the largest is rated power --- Source: https://comparepv.com/compare/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-585/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-595 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.