--- title: "Tongwei TWMNF-66HD710XX vs Tongwei TWMNF-66HD715XX - Solar Panel Comparison | ComparePV" description: "Compare Tongwei TWMNF-66HD710XX vs Tongwei TWMNF-66HD715XX 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-twmnf-66hd710xx/tw-solar-tongwei-twmnf-66hd715xx" updated: 2026-09-11 --- # Tongwei TWMNF-66HD710XX vs Tongwei TWMNF-66HD715XX Identical on every published parameter All 18 comparable parameters agree, with 1 more left out because at least one datasheet does not publish it. 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 TWMNF-66HD710XX](https://comparepv.com/panel/tw-solar-tongwei-twmnf-66hd710xx) | [Tongwei TWMNF-66HD715XX](https://comparepv.com/panel/tw-solar-tongwei-twmnf-66hd715xx) | | Manufacturer | Tongwei | Tongwei | | Power | 710 Wp | 715 Wp | | Efficiency | 22.90 % | 23.00 % | | Technology | N-type | N-type | ## Every compared parameter | Parameter | 66HD710XX | 66HD715XX | | --- | --- | --- | | Rated power | 710 Wp | 715 Wp | | Module efficiency | 22.90 % | 23.00 % | | Power density | 228.6 Wp/m² | 230.2 Wp/m² | | Open-circuit voltage | 48.94 V | 49.11 V | | Voltage at max power | 40.69 V | 40.69 V | | Short-circuit current | 18.59 A | 18.55 A | | Current at max power | 17.64 A | 17.60 A | | Temperature coefficient | -0.280 %/°C | -0.280 %/°C | | Dimensions | 2384x1303x33 mm | 2384x1303x33 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 37.9 kg | 37.9 kg | | Weight per kWp | 53.4 kg/kWp | 53.0 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | - | - | | Cell technology | N-type | N-type | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 132 | | Bifacial | Yes | Yes | ## Thirty-year yield Declared first-year losses, with 0.40% a year afterwards assumed for both panels, 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, 66HD710XX:** 23,822 kWh - **Cumulative output, 66HD715XX:** 23,990 kWh - **Gap:** 168 kWh ## Output when hot | Condition | Cell temperature | 66HD710XX | 66HD715XX | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 710 W | 715 W | 100.0% of rated power | | Cool, bright day | 40 °C | 680 W | 685 W | 95.8% of rated power | | Typical summer roof | 55 °C | 650 W | 655 W | 91.6% of rated power | | Hot roof | 70 °C | 621 W | 625 W | 87.4% of rated power | ## Against the whole database | Measure | 66HD710XX | 66HD715XX | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #2,359 | #1,919 | 14,005 | 66HD715XX leads by 440 places | | Power density | #2,474 | #2,018 | 14,005 | 66HD715XX leads by 456 places | | Heat behaviour | #1,309 | #1,309 | 14,005 | Tied - the same position in the database | | Weight | #7,271 | #6,744 | 14,005 | 66HD715XX leads by 527 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #817 | #678 | 14,005 | 66HD715XX leads by 139 places | ## Questions ### Which panel is better: Tongwei TWMNF-66HD710XX or Tongwei TWMNF-66HD715XX? According to our database: **Tongwei TWMNF-66HD715XX** has higher module efficiency (**23.00%** vs **22.90%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Tongwei TWMNF-66HD710XX and Tongwei TWMNF-66HD715XX? **Tongwei TWMNF-66HD710XX** has a module efficiency of **22.90%**, while **Tongwei TWMNF-66HD715XX** is **23.00%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Tongwei TWMNF-66HD710XX use vs Tongwei TWMNF-66HD715XX? **Tongwei TWMNF-66HD710XX** uses **N-type** cells; **Tongwei TWMNF-66HD715XX** 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 TWMNF-66HD710XX and Tongwei TWMNF-66HD715XX? **Tongwei TWMNF-66HD710XX** has a **30 years** power warranty; **Tongwei TWMNF-66HD715XX** 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 TWMNF-66HD710XX and Tongwei TWMNF-66HD715XX bifacial panels? Both **Tongwei TWMNF-66HD710XX** and **Tongwei TWMNF-66HD715XX** 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 TWMNF-66HD710XX vs Tongwei TWMNF-66HD720XX](https://comparepv.com/compare/tw-solar-tongwei-twmnf-66hd710xx/tw-solar-tongwei-twmnf-66hd720xx) - 3 differences, the largest is module efficiency - [Tongwei TWMNF-66HD710XX vs Tongwei TWMNF-66HD705XX](https://comparepv.com/compare/tw-solar-tongwei-twmnf-66hd710xx/tw-solar-tongwei-twmnf-66hd705xx) - One difference: module efficiency - [Tongwei TWMNF-66HD710XX vs Tongwei TWMNF-66HD700XX](https://comparepv.com/compare/tw-solar-tongwei-twmnf-66hd710xx/tw-solar-tongwei-twmnf-66hd700xx) - 3 differences, the largest is module efficiency - [Tongwei TWMNF-66HD710XX vs Tongwei TWMNF-66HD750](https://comparepv.com/compare/tw-solar-tongwei-twmnf-66hd710xx/tongwei-solar-twmnf-66hd750) - 7 differences, the largest is module efficiency - [Tongwei TWMNF-66HD710XX vs Tongwei TWMNF-66HD745](https://comparepv.com/compare/tw-solar-tongwei-twmnf-66hd710xx/tongwei-solar-twmnf-66hd745) - 7 differences, the largest is module efficiency - [Tongwei TWMNF-66HD710XX vs Tongwei TWMNF-66HD740](https://comparepv.com/compare/tw-solar-tongwei-twmnf-66hd710xx/tongwei-solar-twmnf-66hd740) - 6 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/tw-solar-tongwei-twmnf-66hd710xx/tw-solar-tongwei-twmnf-66hd715xx 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.