--- title: "Tongwei TWMND-72HD585 vs Tongwei TWMND-72HD590 - Solar Panel Comparison | ComparePV" description: "Compare Tongwei TWMND-72HD585 vs Tongwei TWMND-72HD590 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-72hd585/tw-solar-tongwei-twmnd-72hd590" image: "https://comparepv.com/og/compare/panels/tw-solar-tongwei-twmnd-72hd585/tw-solar-tongwei-twmnd-72hd590.png" updated: 2026-09-11 --- # Tongwei TWMND-72HD585 vs Tongwei TWMND-72HD590 72HD590 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 | [Tongwei TWMND-72HD585](https://comparepv.com/panel/tw-solar-tongwei-twmnd-72hd585) | [Tongwei TWMND-72HD590](https://comparepv.com/panel/tw-solar-tongwei-twmnd-72hd590) | | Manufacturer | Tongwei | Tongwei | | Power | 585 Wp | 590 Wp | | Efficiency | 22.60 % | 22.80 % | | Technology | N-type | N-type | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 72HD585 | 72HD590 | Difference | | --- | --- | --- | --- | | Module efficiency | 22.60 % | 22.80 % | +0.20 pp for 72HD590 | ## Every compared parameter | Parameter | 72HD585 | 72HD590 | | --- | --- | --- | | Rated power | 585 Wp | 590 Wp | | Module efficiency | 22.60 % | 22.80 % | | Power density | 226.5 Wp/m² | 228.4 Wp/m² | | Open-circuit voltage | 52.50 V | 52.70 V | | Voltage at max power | 44.10 V | 44.27 V | | Short-circuit current | 13.90 A | 13.95 A | | Current at max power | 13.27 A | 13.33 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 | 53.8 kg/kWp | 53.4 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, 72HD585:** 19,628 kWh - **Cumulative output, 72HD590:** 19,796 kWh - **Gap:** 168 kWh ## Output when hot | Condition | Cell temperature | 72HD585 | 72HD590 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 585 W | 590 W | 100.0% of rated power | | Cool, bright day | 40 °C | 560 W | 565 W | 95.8% of rated power | | Typical summer roof | 55 °C | 536 W | 540 W | 91.6% of rated power | | Hot roof | 70 °C | 511 W | 516 W | 87.4% of rated power | ## Against the whole database | Measure | 72HD585 | 72HD590 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #3,716 | #2,769 | 14,129 | 72HD590 leads by 947 places | | Power density | #3,557 | #2,653 | 14,129 | 72HD590 leads by 904 places | | Heat behaviour | #1,347 | #1,347 | 14,129 | Tied - the same position in the database | | Weight | #7,974 | #7,361 | 14,129 | 72HD590 leads by 613 places | | Warranty | #21 | #21 | 14,129 | Tied - the same position in the database | | Overall | #4,244 | #3,836 | 14,129 | 72HD590 leads by 408 places | ## Questions ### Which panel is better: Tongwei TWMND-72HD585 or Tongwei TWMND-72HD590? According to our database: **Tongwei TWMND-72HD590** has higher module efficiency (**22.80%** vs **22.60%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Tongwei TWMND-72HD585 and Tongwei TWMND-72HD590? **Tongwei TWMND-72HD585** has a module efficiency of **22.60%**, while **Tongwei TWMND-72HD590** is **22.80%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Tongwei TWMND-72HD585 use vs Tongwei TWMND-72HD590? **Tongwei TWMND-72HD585** uses **N-type** cells; **Tongwei TWMND-72HD590** 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-72HD585 and Tongwei TWMND-72HD590? **Tongwei TWMND-72HD585** has a **30 years** power warranty; **Tongwei TWMND-72HD590** 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-72HD585 and Tongwei TWMND-72HD590 bifacial panels? Both **Tongwei TWMND-72HD585** and **Tongwei TWMND-72HD590** 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-72HD585 vs Tongwei TWMND-72HD600](https://comparepv.com/compare/tw-solar-tongwei-twmnd-72hd585/tw-solar-tongwei-twmnd-72hd600) - 3 differences, the largest is module efficiency - [Tongwei TWMND-72HD585 vs Tongwei TWMND-72HD595](https://comparepv.com/compare/tw-solar-tongwei-twmnd-72hd585/tw-solar-tongwei-twmnd-72hd595) - 3 differences, the largest is module efficiency - [Tongwei TWMND-72HD585 vs Tongwei TWMND-72HD580](https://comparepv.com/compare/tw-solar-tongwei-twmnd-72hd585/tw-solar-tongwei-twmnd-72hd580) - The same specification on paper - [Tongwei TWMND-72HD585 vs Tongwei TWMNF-66HD750](https://comparepv.com/compare/tw-solar-tongwei-twmnd-72hd585/tongwei-solar-twmnf-66hd750) - 13 differences, the largest is module efficiency - [Tongwei TWMND-72HD585 vs Tongwei TWMNF-66HD745](https://comparepv.com/compare/tw-solar-tongwei-twmnd-72hd585/tongwei-solar-twmnf-66hd745) - 13 differences, the largest is module efficiency - [Tongwei TWMND-72HD585 vs Tongwei TWMNF-66HD740](https://comparepv.com/compare/tw-solar-tongwei-twmnd-72hd585/tongwei-solar-twmnf-66hd740) - 13 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/tw-solar-tongwei-twmnd-72hd585/tw-solar-tongwei-twmnd-72hd590 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.