--- title: "Tongwei TWMNF-66HD750 vs Tongwei TWMHF-66HD730X - Solar Panel Comparison | ComparePV" description: "Compare Tongwei TWMNF-66HD750 vs Tongwei TWMHF-66HD730X side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/tongwei-solar-twmnf-66hd750/tw-solar-twmhf-66hd730x" updated: 2026-09-11 --- # Tongwei TWMNF-66HD750 vs Tongwei TWMHF-66HD730X 8 differences, and they point both ways The largest is temperature coefficient: 0.040 %/°C better in heat. 11 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Tongwei TWMNF-66HD750](https://comparepv.com/panel/tongwei-solar-twmnf-66hd750) | [Tongwei TWMHF-66HD730X](https://comparepv.com/panel/tw-solar-twmhf-66hd730x) | | Manufacturer | Tongwei | Tongwei | | Power | 750 Wp | 730 Wp | | Efficiency | 24.10 % | 23.50 % | | Technology | TOPCon | N-type | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | TWMNF-66HD750 | TWMHF-66HD730X | Difference | | --- | --- | --- | --- | | Temperature coefficient | -0.280 %/°C | -0.240 %/°C | +0.040 %/°C for TWMHF-66HD730X | | Module efficiency | 24.10 % | 23.50 % | +0.60 pp for TWMNF-66HD750 | | Product warranty | 12 yrs | 15 yrs | +3 yrs for TWMHF-66HD730X | | Power density | 241.4 Wp/m² | 235.0 Wp/m² | +6.4 Wp/m² for TWMNF-66HD750 | | Rated power | 750 Wp | 730 Wp | +20 W for TWMNF-66HD750 | | Cell technology | TOPCon | N-type | TOPCon vs N-type | | Short-circuit current | 18.93 A | 18.28 A | 0.65 A apart | | Current at max power | 17.85 A | 17.33 A | 0.52 A apart | ## Every compared parameter | Parameter | TWMNF-66HD750 | TWMHF-66HD730X | | --- | --- | --- | | Rated power | 750 Wp | 730 Wp | | Module efficiency | 24.10 % | 23.50 % | | Power density | 241.4 Wp/m² | 235.0 Wp/m² | | Open-circuit voltage | 50.10 V | 50.46 V | | Voltage at max power | 42.02 V | 42.13 V | | Short-circuit current | 18.93 A | 18.28 A | | Current at max power | 17.85 A | 17.33 A | | Temperature coefficient | -0.280 %/°C | -0.240 %/°C | | Dimensions | 2384x1303x33 mm | 2384x1303x33 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 37.3 kg | 37.0 kg | | Weight per kWp | 49.7 kg/kWp | 50.7 kg/kWp | | Product warranty | 12 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.38 %/yr | | Cell technology | TOPCon | 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 - **Cumulative output, TWMNF-66HD750:** 25,164 kWh - **Cumulative output, TWMHF-66HD730X:** 24,588 kWh - **Gap:** 576 kWh ## Output when hot | Condition | Cell temperature | TWMNF-66HD750 | TWMHF-66HD730X | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 750 W | 730 W | 100.0% of rated power | | Cool, bright day | 40 °C | 719 W | 704 W | 95.8% of rated power | | Typical summer roof | 55 °C | 687 W | 677 W | 91.6% of rated power | | Hot roof | 70 °C | 656 W | 651 W | 87.4% of rated power | ## Against the whole database | Measure | TWMNF-66HD750 | TWMHF-66HD730X | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #219 | #716 | 14,005 | TWMNF-66HD750 leads by 497 places | | Power density | #219 | #800 | 14,005 | TWMNF-66HD750 leads by 581 places | | Heat behaviour | #1,309 | #13 | 14,005 | TWMHF-66HD730X leads by 1,296 places | | Weight | #3,210 | #4,111 | 14,005 | TWMNF-66HD750 leads by 901 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #122 | #196 | 14,005 | TWMNF-66HD750 leads by 74 places | ## Questions ### Which panel is better: Tongwei TWMNF-66HD750 or Tongwei TWMHF-66HD730X? According to our database: **Tongwei TWMNF-66HD750** has higher module efficiency (**24.10%** vs **23.50%**); **Tongwei TWMHF-66HD730X** tolerates heat better (temp coeff **-0.240%/°C** vs **-0.280%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Tongwei TWMNF-66HD750 and Tongwei TWMHF-66HD730X? **Tongwei TWMNF-66HD750** has a module efficiency of **24.10%**, while **Tongwei TWMHF-66HD730X** is **23.50%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Tongwei TWMNF-66HD750 use vs Tongwei TWMHF-66HD730X? **Tongwei TWMNF-66HD750** uses **TOPCon** cells; **Tongwei TWMHF-66HD730X** 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-66HD750 and Tongwei TWMHF-66HD730X? **Tongwei TWMNF-66HD750** has a **30 years** power warranty; **Tongwei TWMHF-66HD730X** 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-66HD750 and Tongwei TWMHF-66HD730X bifacial panels? Both **Tongwei TWMNF-66HD750** and **Tongwei TWMHF-66HD730X** 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-66HD750 vs Tongwei TWMNF-66HD745](https://comparepv.com/compare/tongwei-solar-twmnf-66hd750/tongwei-solar-twmnf-66hd745) - The same specification on paper - [Tongwei TWMNF-66HD750 vs Tongwei TWMNF-66HD740](https://comparepv.com/compare/tongwei-solar-twmnf-66hd750/tongwei-solar-twmnf-66hd740) - 3 differences, the largest is module efficiency - [Tongwei TWMNF-66HD750 vs Tongwei TWMNF-66HD735](https://comparepv.com/compare/tongwei-solar-twmnf-66hd750/tongwei-solar-twmnf-66hd735) - 3 differences, the largest is module efficiency - [Tongwei TWMNF-66HD750 vs Tongwei TWMNF-66HD730](https://comparepv.com/compare/tongwei-solar-twmnf-66hd750/tongwei-solar-twmnf-66hd730) - 3 differences, the largest is module efficiency - [Tongwei TWMHF-66HD730X vs Tongwei TWMHF-66HD740X](https://comparepv.com/compare/tw-solar-twmhf-66hd730x/tw-solar-twmhf-66hd740x) - 3 differences, the largest is module efficiency - [Tongwei TWMHF-66HD730X vs Tongwei TWMHF-66HD735X](https://comparepv.com/compare/tw-solar-twmhf-66hd730x/tw-solar-twmhf-66hd735x) - One difference: module efficiency --- Source: https://comparepv.com/compare/tongwei-solar-twmnf-66hd750/tw-solar-twmhf-66hd730x 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.