--- title: "Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590 vs Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 - Solar Panel Comparison | ComparePV" description: "Compare Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590 vs Q-Cells Q.PEAK DUO 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-xl-g11s-3-bfg-590/qcells-hanwha-q-cells-america-inc-q-peak-duo-xl-g11s-3-bfg-595" updated: 2026-09-11 --- # Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590 vs Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 595 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 | [Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590](https://comparepv.com/panel/qcells-hanwha-q-cells-america-inc-q-peak-duo-xl-g11s-3-bfg-590) | [Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595](https://comparepv.com/panel/qcells-hanwha-q-cells-america-inc-q-peak-duo-xl-g11s-3-bfg-595) | | Manufacturer | Q-Cells | Q-Cells | | Power | 590 Wp | 595 Wp | | Efficiency | 21.10 % | 21.30 % | | Technology | PERC | PERC | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 590 | 595 | Difference | | --- | --- | --- | --- | | Module efficiency | 21.10 % | 21.30 % | +0.20 pp for 595 | ## Every compared parameter | Parameter | 590 | 595 | | --- | --- | --- | | Rated power | 590 Wp | 595 Wp | | Module efficiency | 21.10 % | 21.30 % | | Power density | 211.3 Wp/m² | 213.1 Wp/m² | | Open-circuit voltage | 53.60 V | 53.63 V | | Voltage at max power | 44.96 V | 45.18 V | | Short-circuit current | 13.74 A | 13.77 A | | Current at max power | 13.12 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 | 34.9 kg | 34.9 kg | | Weight per kWp | 59.2 kg/kWp | 58.7 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | 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, 590:** 19,429 kWh - **Cumulative output, 595:** 19,594 kWh - **Gap:** 165 kWh ## Output when hot | Condition | Cell temperature | 590 | 595 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 590 W | 595 W | 100.0% of rated power | | Cool, bright day | 40 °C | 560 W | 565 W | 94.9% of rated power | | Typical summer roof | 55 °C | 530 W | 534 W | 89.8% of rated power | | Hot roof | 70 °C | 500 W | 504 W | 84.7% of rated power | ## Against the whole database | Measure | 590 | 595 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #9,297 | #8,519 | 14,005 | 595 leads by 778 places | | Power density | #9,241 | #8,470 | 14,005 | 595 leads by 771 places | | Heat behaviour | #8,778 | #8,778 | 14,005 | Tied - the same position in the database | | Weight | #12,036 | #11,828 | 14,005 | 595 leads by 208 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #5,771 | #5,375 | 14,005 | 595 leads by 396 places | ## Questions ### Which panel is better: Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590 or Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595? According to our database: **Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595** has higher module efficiency (**21.30%** vs **21.10%**). 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 XL-G11S.3 / BFG 590 and Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595? **Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590** has a module efficiency of **21.10%**, while **Q-Cells Q.PEAK DUO 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 XL-G11S.3 / BFG 590 use vs Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595? **Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590** uses **PERC** cells; **Q-Cells Q.PEAK DUO 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 XL-G11S.3 / BFG 590 and Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595? **Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590** has a **30 years** power warranty; **Q-Cells Q.PEAK DUO 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 XL-G11S.3 / BFG 590 and Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 595 bifacial panels? Both **Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590** and **Q-Cells Q.PEAK DUO 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 XL-G11S.3 / BFG 590 vs Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 605](https://comparepv.com/compare/qcells-hanwha-q-cells-america-inc-q-peak-duo-xl-g11s-3-bfg-590/qcells-hanwha-q-cells-america-inc-q-peak-duo-xl-g11s-3-bfg-605) - 3 differences, the largest is module efficiency - [Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590 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-xl-g11s-3-bfg-590/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-600) - 4 differences, the largest is module efficiency - [Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590 vs Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 600](https://comparepv.com/compare/qcells-hanwha-q-cells-america-inc-q-peak-duo-xl-g11s-3-bfg-590/qcells-hanwha-q-cells-america-inc-q-peak-duo-xl-g11s-3-bfg-600) - 3 differences, the largest is module efficiency - [Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590 vs Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 595](https://comparepv.com/compare/qcells-hanwha-q-cells-america-inc-q-peak-duo-xl-g11s-3-bfg-590/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-595) - 3 differences, the largest is module efficiency - [Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590 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-xl-g11s-3-bfg-590/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-590) - 2 differences, the largest is weight - [Q-Cells Q.PEAK DUO XL-G11S.3 / BFG 590 vs Q-Cells Q.PEAK DUO RSF XL-G11S.3 / BFG 585](https://comparepv.com/compare/qcells-hanwha-q-cells-america-inc-q-peak-duo-xl-g11s-3-bfg-590/qcells-hanwha-q-cells-america-inc-q-peak-duo-rsf-xl-g11s-3-bfg-585) - 2 differences, the largest is weight per kwp --- Source: https://comparepv.com/compare/qcells-hanwha-q-cells-america-inc-q-peak-duo-xl-g11s-3-bfg-590/qcells-hanwha-q-cells-america-inc-q-peak-duo-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.