--- title: "Hanersun HN21N-66HT735W vs Hanersun HN21N-66HT740W - Solar Panel Comparison | ComparePV" description: "Compare Hanersun HN21N-66HT735W vs Hanersun HN21N-66HT740W 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-66ht735w/hanersun-hn21n-66ht740w" updated: 2026-09-11 --- # Hanersun HN21N-66HT735W vs Hanersun HN21N-66HT740W 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 | [Hanersun HN21N-66HT735W](https://comparepv.com/panel/hanersun-hn21n-66ht735w) | [Hanersun HN21N-66HT740W](https://comparepv.com/panel/hanersun-hn21n-66ht740w) | | Manufacturer | Hanersun | Hanersun | | Power | 735 Wp | 740 Wp | | Efficiency | 23.70 % | 23.80 % | | Technology | TOPCon | TOPCon | ## Every compared parameter | Parameter | 66HT735W | 66HT740W | | --- | --- | --- | | Rated power | 735 Wp | 740 Wp | | Module efficiency | 23.70 % | 23.80 % | | Power density | 236.6 Wp/m² | 238.2 Wp/m² | | Open-circuit voltage | 49.60 V | 49.80 V | | Voltage at max power | 41.76 V | 41.92 V | | Short-circuit current | 18.62 A | 18.66 A | | Current at max power | 17.61 A | 17.66 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 | 50.9 kg/kWp | 50.5 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, 66HT735W:** 24,661 kWh - **Cumulative output, 66HT740W:** 24,828 kWh - **Gap:** 167 kWh ## Output when hot | Condition | Cell temperature | 66HT735W | 66HT740W | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 735 W | 740 W | 100.0% of rated power | | Cool, bright day | 40 °C | 704 W | 709 W | 95.8% of rated power | | Typical summer roof | 55 °C | 673 W | 678 W | 91.6% of rated power | | Hot roof | 70 °C | 642 W | 647 W | 87.4% of rated power | ## Against the whole database | Measure | 66HT735W | 66HT740W | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #517 | #433 | 14,005 | 66HT740W leads by 84 places | | Power density | #582 | #431 | 14,005 | 66HT740W leads by 151 places | | Heat behaviour | #1,309 | #1,309 | 14,005 | Tied - the same position in the database | | Weight | #4,262 | #3,922 | 14,005 | 66HT740W leads by 340 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #155 | #130 | 14,005 | 66HT740W leads by 25 places | ## Questions ### Which panel is better: Hanersun HN21N-66HT735W or Hanersun HN21N-66HT740W? According to our database: **Hanersun HN21N-66HT**740 W**** has higher module efficiency (**23.80%** vs **23.70%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Hanersun HN21N-66HT735W and Hanersun HN21N-66HT740W? **Hanersun HN21N-66HT**735 W**** has a module efficiency of **23.70%**, while **Hanersun HN21N-66HT**740 W**** is **23.80%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Hanersun HN21N-66HT735W use vs Hanersun HN21N-66HT740W? **Hanersun HN21N-66HT**735 W**** uses **TOPCon** cells; **Hanersun HN21N-66HT**740 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-66HT735W and Hanersun HN21N-66HT740W? **Hanersun HN21N-66HT**735 W**** has a **30 years** power warranty; **Hanersun HN21N-66HT**740 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-66HT735W and Hanersun HN21N-66HT740W bifacial panels? Both **Hanersun HN21N-66HT**735 W**** and **Hanersun HN21N-66HT**740 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-66HT735W vs Hanersun HN21N-66HT750W](https://comparepv.com/compare/hanersun-hn21n-66ht735w/hanersun-hn21n-66ht750w) - 3 differences, the largest is module efficiency - [Hanersun HN21N-66HT735W vs Hanersun HN21N-66HT745W](https://comparepv.com/compare/hanersun-hn21n-66ht735w/hanersun-hn21n-66ht745w) - 3 differences, the largest is module efficiency - [Hanersun HN21N-66HT735W vs Hanersun HN21RN-66QT670W](https://comparepv.com/compare/hanersun-hn21n-66ht735w/hanersun-hn21rn-66qt670w) - 13 differences, the largest is module efficiency - [Hanersun HN21N-66HT735W vs Hanersun HN21RN-66QT665W](https://comparepv.com/compare/hanersun-hn21n-66ht735w/hanersun-hn21rn-66qt665w) - 13 differences, the largest is module efficiency - [Hanersun HN21N-66HT735W vs Hanersun HN21RN-66QT660W](https://comparepv.com/compare/hanersun-hn21n-66ht735w/hanersun-hn21rn-66qt660w) - 12 differences, the largest is module efficiency - [Hanersun HN21N-66HT735W vs Hanersun HN21RN-66QT655W](https://comparepv.com/compare/hanersun-hn21n-66ht735w/hanersun-hn21rn-66qt655w) - 11 differences, the largest is rated power --- Source: https://comparepv.com/compare/hanersun-hn21n-66ht735w/hanersun-hn21n-66ht740w 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.