--- title: "Tongwei TWMHF-66HD720X vs Tongwei TWMHF-66HD725X - Solar Panel Comparison | ComparePV" description: "Compare Tongwei TWMHF-66HD720X vs Tongwei TWMHF-66HD725X 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-twmhf-66hd720x/tw-solar-twmhf-66hd725x" updated: 2026-09-11 --- # Tongwei TWMHF-66HD720X vs Tongwei TWMHF-66HD725X 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 TWMHF-66HD720X](https://comparepv.com/panel/tw-solar-twmhf-66hd720x) | [Tongwei TWMHF-66HD725X](https://comparepv.com/panel/tw-solar-twmhf-66hd725x) | | Manufacturer | Tongwei | Tongwei | | Power | 720 Wp | 725 Wp | | Efficiency | 23.20 % | 23.30 % | | Technology | N-type | N-type | ## Every compared parameter | Parameter | 66HD720X | 66HD725X | | --- | --- | --- | | Rated power | 720 Wp | 725 Wp | | Module efficiency | 23.20 % | 23.30 % | | Power density | 231.8 Wp/m² | 233.4 Wp/m² | | Open-circuit voltage | 50.30 V | 50.38 V | | Voltage at max power | 41.94 V | 42.03 V | | Short-circuit current | 18.08 A | 18.18 A | | Current at max power | 17.17 A | 17.25 A | | Temperature coefficient | -0.240 %/°C | -0.240 %/°C | | Dimensions | 2384x1303x33 mm | 2384x1303x33 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 37.0 kg | 37.0 kg | | Weight per kWp | 51.4 kg/kWp | 51.0 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.38 %/yr | 0.38 %/yr | | Cell technology | N-type | N-type | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 132 | | 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, 66HD720X:** 24,251 kWh - **Cumulative output, 66HD725X:** 24,420 kWh - **Gap:** 169 kWh ## Output when hot | Condition | Cell temperature | 66HD720X | 66HD725X | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 720 W | 725 W | 100.0% of rated power | | Cool, bright day | 40 °C | 694 W | 699 W | 96.4% of rated power | | Typical summer roof | 55 °C | 668 W | 673 W | 92.8% of rated power | | Hot roof | 70 °C | 642 W | 647 W | 89.2% of rated power | ## Against the whole database | Measure | 66HD720X | 66HD725X | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,306 | #1,017 | 14,005 | 66HD725X leads by 289 places | | Power density | #1,347 | #936 | 14,005 | 66HD725X leads by 411 places | | Heat behaviour | #13 | #13 | 14,005 | Tied - the same position in the database | | Weight | #4,775 | #4,382 | 14,005 | 66HD725X leads by 393 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #330 | #263 | 14,005 | 66HD725X leads by 67 places | ## Questions ### Which panel is better: Tongwei TWMHF-66HD720X or Tongwei TWMHF-66HD725X? According to our database: **Tongwei TWMHF-66HD725X** has higher module efficiency (**23.30%** vs **23.20%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Tongwei TWMHF-66HD720X and Tongwei TWMHF-66HD725X? **Tongwei TWMHF-66HD720X** has a module efficiency of **23.20%**, while **Tongwei TWMHF-66HD725X** is **23.30%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Tongwei TWMHF-66HD720X use vs Tongwei TWMHF-66HD725X? **Tongwei TWMHF-66HD720X** uses **N-type** cells; **Tongwei TWMHF-66HD725X** 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 TWMHF-66HD720X and Tongwei TWMHF-66HD725X? **Tongwei TWMHF-66HD720X** has a **30 years** power warranty; **Tongwei TWMHF-66HD725X** 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 TWMHF-66HD720X and Tongwei TWMHF-66HD725X bifacial panels? Both **Tongwei TWMHF-66HD720X** and **Tongwei TWMHF-66HD725X** 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 TWMHF-66HD720X vs Tongwei TWMHF-66HD740X](https://comparepv.com/compare/tw-solar-twmhf-66hd720x/tw-solar-twmhf-66hd740x) - 3 differences, the largest is module efficiency - [Tongwei TWMHF-66HD720X vs Tongwei TWMHF-66HD735X](https://comparepv.com/compare/tw-solar-twmhf-66hd720x/tw-solar-twmhf-66hd735x) - 3 differences, the largest is module efficiency - [Tongwei TWMHF-66HD720X vs Tongwei TWMHF-66HD730X](https://comparepv.com/compare/tw-solar-twmhf-66hd720x/tw-solar-twmhf-66hd730x) - 3 differences, the largest is module efficiency - [Tongwei TWMHF-66HD720X vs Tongwei TWMHF-66HD715X](https://comparepv.com/compare/tw-solar-twmhf-66hd720x/tw-solar-twmhf-66hd715x) - One difference: module efficiency - [Tongwei TWMHF-66HD720X vs Tongwei TWMNF-66HD750](https://comparepv.com/compare/tw-solar-twmhf-66hd720x/tongwei-solar-twmnf-66hd750) - 8 differences, the largest is module efficiency - [Tongwei TWMHF-66HD720X vs Tongwei TWMNF-66HD745](https://comparepv.com/compare/tw-solar-twmhf-66hd720x/tongwei-solar-twmnf-66hd745) - 8 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/tw-solar-twmhf-66hd720x/tw-solar-twmhf-66hd725x 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.