--- title: "Tongwei TWMND-72HD580 vs Tongwei TWMND-72HD585 - Solar Panel Comparison | ComparePV" description: "Compare Tongwei TWMND-72HD580 vs Tongwei TWMND-72HD585 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/tw-solar-tongwei-twmnd-72hd580/tw-solar-tongwei-twmnd-72hd585" image: "https://comparepv.com/og/compare/panels/tw-solar-tongwei-twmnd-72hd580/tw-solar-tongwei-twmnd-72hd585.png" updated: 2026-09-11 --- # Tongwei TWMND-72HD580 vs Tongwei TWMND-72HD585 Identical on every published parameter All 19 comparable parameters agree. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Tongwei TWMND-72HD580](https://comparepv.com/panel/tw-solar-tongwei-twmnd-72hd580) | [Tongwei TWMND-72HD585](https://comparepv.com/panel/tw-solar-tongwei-twmnd-72hd585) | | Manufacturer | Tongwei | Tongwei | | Power | 580 Wp | 585 Wp | | Efficiency | 22.50 % | 22.60 % | | Technology | N-type | N-type | ## Every compared parameter | Parameter | 72HD580 | 72HD585 | | --- | --- | --- | | Rated power | 580 Wp | 585 Wp | | Module efficiency | 22.50 % | 22.60 % | | Power density | 224.5 Wp/m² | 226.5 Wp/m² | | Open-circuit voltage | 52.30 V | 52.50 V | | Voltage at max power | 43.93 V | 44.10 V | | Short-circuit current | 13.85 A | 13.90 A | | Current at max power | 13.21 A | 13.27 A | | Temperature coefficient | -0.280 %/°C | -0.280 %/°C | | Dimensions | 2278x1134x30 mm | 2278x1134x30 mm | | Module area | 2.583 m² | 2.583 m² | | Weight | 31.5 kg | 31.5 kg | | Weight per kWp | 54.3 kg/kWp | 53.8 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | N-type | N-type | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 144 | 144 | | 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 (-0.280 %/°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, 72HD580:** 19,460 kWh - **Cumulative output, 72HD585:** 19,628 kWh - **Gap:** 168 kWh ## Output when hot | Condition | Cell temperature | 72HD580 | 72HD585 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 580 W | 585 W | 100.0% of rated power | | Cool, bright day | 40 °C | 556 W | 560 W | 95.8% of rated power | | Typical summer roof | 55 °C | 531 W | 536 W | 91.6% of rated power | | Hot roof | 70 °C | 507 W | 511 W | 87.4% of rated power | ## Against the whole database | Measure | 72HD580 | 72HD585 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #4,281 | #3,716 | 14,129 | 72HD585 leads by 565 places | | Power density | #4,607 | #3,557 | 14,129 | 72HD585 leads by 1,050 places | | Heat behaviour | #1,347 | #1,347 | 14,129 | Tied - the same position in the database | | Weight | #8,628 | #7,974 | 14,129 | 72HD585 leads by 654 places | | Warranty | #21 | #21 | 14,129 | Tied - the same position in the database | | Overall | #4,533 | #4,244 | 14,129 | 72HD585 leads by 289 places | ## Questions ### Which panel is better: Tongwei TWMND-72HD580 or Tongwei TWMND-72HD585? According to our database: **Tongwei TWMND-72HD585** has higher module efficiency (**22.60%** vs **22.50%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Tongwei TWMND-72HD580 and Tongwei TWMND-72HD585? **Tongwei TWMND-72HD580** has a module efficiency of **22.50%**, while **Tongwei TWMND-72HD585** is **22.60%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Tongwei TWMND-72HD580 use vs Tongwei TWMND-72HD585? **Tongwei TWMND-72HD580** uses **N-type** cells; **Tongwei TWMND-72HD585** uses **N-type**. 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 Tongwei TWMND-72HD580 and Tongwei TWMND-72HD585? **Tongwei TWMND-72HD580** has a **30 years** power warranty; **Tongwei TWMND-72HD585** 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 Tongwei TWMND-72HD580 and Tongwei TWMND-72HD585 bifacial panels? Both **Tongwei TWMND-72HD580** and **Tongwei TWMND-72HD585** 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 - [Tongwei TWMND-72HD580 vs Tongwei TWMND-72HD600](https://comparepv.com/compare/tw-solar-tongwei-twmnd-72hd580/tw-solar-tongwei-twmnd-72hd600) - 4 differences, the largest is module efficiency - [Tongwei TWMND-72HD580 vs Tongwei TWMND-72HD595](https://comparepv.com/compare/tw-solar-tongwei-twmnd-72hd580/tw-solar-tongwei-twmnd-72hd595) - 3 differences, the largest is module efficiency - [Tongwei TWMND-72HD580 vs Tongwei TWMND-72HD590](https://comparepv.com/compare/tw-solar-tongwei-twmnd-72hd580/tw-solar-tongwei-twmnd-72hd590) - 3 differences, the largest is module efficiency - [Tongwei TWMND-72HD580 vs Tongwei TWMNF-66HD750](https://comparepv.com/compare/tw-solar-tongwei-twmnd-72hd580/tongwei-solar-twmnf-66hd750) - 13 differences, the largest is module efficiency - [Tongwei TWMND-72HD580 vs Tongwei TWMNF-66HD745](https://comparepv.com/compare/tw-solar-tongwei-twmnd-72hd580/tongwei-solar-twmnf-66hd745) - 13 differences, the largest is module efficiency - [Tongwei TWMND-72HD580 vs Tongwei TWMNF-66HD740](https://comparepv.com/compare/tw-solar-tongwei-twmnd-72hd580/tongwei-solar-twmnf-66hd740) - 13 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/tw-solar-tongwei-twmnd-72hd580/tw-solar-tongwei-twmnd-72hd585 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.