--- title: "Hanersun HN21N-66HT740W vs Hanersun HN21N-66HT750W - Solar Panel Comparison | ComparePV" description: "Compare Hanersun HN21N-66HT740W vs Hanersun HN21N-66HT750W side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/hanersun-hn21n-66ht740w/hanersun-hn21n-66ht750w" updated: 2026-09-11 --- # Hanersun HN21N-66HT740W vs Hanersun HN21N-66HT750W 66HT750W leads on the differences that matter The largest is module efficiency: 0.30 pp more efficient. 16 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Hanersun HN21N-66HT740W](https://comparepv.com/panel/hanersun-hn21n-66ht740w) | [Hanersun HN21N-66HT750W](https://comparepv.com/panel/hanersun-hn21n-66ht750w) | | Manufacturer | Hanersun | Hanersun | | Power | 740 Wp | 750 Wp | | Efficiency | 23.80 % | 24.10 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 66HT740W | 66HT750W | Difference | | --- | --- | --- | --- | | Module efficiency | 23.80 % | 24.10 % | +0.30 pp for 66HT750W | | Power density | 238.2 Wp/m² | 241.4 Wp/m² | +3.2 Wp/m² for 66HT750W | | Rated power | 740 Wp | 750 Wp | +10 W for 66HT750W | ## Every compared parameter | Parameter | 66HT740W | 66HT750W | | --- | --- | --- | | Rated power | 740 Wp | 750 Wp | | Module efficiency | 23.80 % | 24.10 % | | Power density | 238.2 Wp/m² | 241.4 Wp/m² | | Open-circuit voltage | 49.80 V | 50.20 V | | Voltage at max power | 41.92 V | 42.24 V | | Short-circuit current | 18.66 A | 18.74 A | | Current at max power | 17.66 A | 17.76 A | | Temperature coefficient | -0.280 %/°C | -0.280 %/°C | | Dimensions | 2384x1303x33 mm | 2384x1303x33 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 37.4 kg | 37.4 kg | | Weight per kWp | 50.5 kg/kWp | 49.9 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | TOPCon | TOPCon | | 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 (-0.280 %/°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, 66HT740W:** 24,828 kWh - **Cumulative output, 66HT750W:** 25,164 kWh - **Gap:** 336 kWh ## Output when hot | Condition | Cell temperature | 66HT740W | 66HT750W | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 740 W | 750 W | 100.0% of rated power | | Cool, bright day | 40 °C | 709 W | 719 W | 95.8% of rated power | | Typical summer roof | 55 °C | 678 W | 687 W | 91.6% of rated power | | Hot roof | 70 °C | 647 W | 656 W | 87.4% of rated power | ## Against the whole database | Measure | 66HT740W | 66HT750W | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #433 | #219 | 14,005 | 66HT750W leads by 214 places | | Power density | #431 | #219 | 14,005 | 66HT750W leads by 212 places | | Heat behaviour | #1,309 | #1,309 | 14,005 | Tied - the same position in the database | | Weight | #3,922 | #3,251 | 14,005 | 66HT750W leads by 671 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #130 | #73 | 14,005 | 66HT750W leads by 57 places | ## Questions ### Which panel is better: Hanersun HN21N-66HT740W or Hanersun HN21N-66HT750W? According to our database: **Hanersun HN21N-66HT**750 W**** has higher module efficiency (**24.10%** vs **23.80%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Hanersun HN21N-66HT740W and Hanersun HN21N-66HT750W? **Hanersun HN21N-66HT**740 W**** has a module efficiency of **23.80%**, while **Hanersun HN21N-66HT**750 W**** is **24.10%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Hanersun HN21N-66HT740W use vs Hanersun HN21N-66HT750W? **Hanersun HN21N-66HT**740 W**** uses **TOPCon** cells; **Hanersun HN21N-66HT**750 W**** uses **TOPCon**. 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 Hanersun HN21N-66HT740W and Hanersun HN21N-66HT750W? **Hanersun HN21N-66HT**740 W**** has a **30 years** power warranty; **Hanersun HN21N-66HT**750 W**** 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 Hanersun HN21N-66HT740W and Hanersun HN21N-66HT750W bifacial panels? Both **Hanersun HN21N-66HT**740 W**** and **Hanersun HN21N-66HT**750 W**** 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 - [Hanersun HN21N-66HT740W vs Hanersun HN21N-66HT745W](https://comparepv.com/compare/hanersun-hn21n-66ht740w/hanersun-hn21n-66ht745w) - One difference: module efficiency - [Hanersun HN21N-66HT740W vs Hanersun HN21N-66HT735W](https://comparepv.com/compare/hanersun-hn21n-66ht740w/hanersun-hn21n-66ht735w) - The same specification on paper - [Hanersun HN21N-66HT740W vs Hanersun HN21RN-66QT670W](https://comparepv.com/compare/hanersun-hn21n-66ht740w/hanersun-hn21rn-66qt670w) - 13 differences, the largest is module efficiency - [Hanersun HN21N-66HT740W vs Hanersun HN21RN-66QT665W](https://comparepv.com/compare/hanersun-hn21n-66ht740w/hanersun-hn21rn-66qt665w) - 11 differences, the largest is module efficiency - [Hanersun HN21N-66HT740W vs Hanersun HN21RN-66QT660W](https://comparepv.com/compare/hanersun-hn21n-66ht740w/hanersun-hn21rn-66qt660w) - 11 differences, the largest is rated power - [Hanersun HN21N-66HT740W vs Hanersun HN21RN-66QT655W](https://comparepv.com/compare/hanersun-hn21n-66ht740w/hanersun-hn21rn-66qt655w) - 11 differences, the largest is rated power --- Source: https://comparepv.com/compare/hanersun-hn21n-66ht740w/hanersun-hn21n-66ht750w 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.