--- title: "Hanersun HN21N-66HT735W vs Hanersun HN21N-66HT745W - Solar Panel Comparison | ComparePV" description: "Compare Hanersun HN21N-66HT735W vs Hanersun HN21N-66HT745W 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-66ht745w" updated: 2026-09-11 --- # Hanersun HN21N-66HT735W vs Hanersun HN21N-66HT745W 66HT745W 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-66HT735W](https://comparepv.com/panel/hanersun-hn21n-66ht735w) | [Hanersun HN21N-66HT745W](https://comparepv.com/panel/hanersun-hn21n-66ht745w) | | Manufacturer | Hanersun | Hanersun | | Power | 735 Wp | 745 Wp | | Efficiency | 23.70 % | 24.00 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 66HT735W | 66HT745W | Difference | | --- | --- | --- | --- | | Module efficiency | 23.70 % | 24.00 % | +0.30 pp for 66HT745W | | Power density | 236.6 Wp/m² | 239.8 Wp/m² | +3.2 Wp/m² for 66HT745W | | Rated power | 735 Wp | 745 Wp | +10 W for 66HT745W | ## Every compared parameter | Parameter | 66HT735W | 66HT745W | | --- | --- | --- | | Rated power | 735 Wp | 745 Wp | | Module efficiency | 23.70 % | 24.00 % | | Power density | 236.6 Wp/m² | 239.8 Wp/m² | | Open-circuit voltage | 49.60 V | 50.00 V | | Voltage at max power | 41.76 V | 42.08 V | | Short-circuit current | 18.62 A | 18.70 A | | Current at max power | 17.61 A | 17.71 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 | 50.2 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, 66HT745W:** 24,996 kWh - **Gap:** 335 kWh ## Output when hot | Condition | Cell temperature | 66HT735W | 66HT745W | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 735 W | 745 W | 100.0% of rated power | | Cool, bright day | 40 °C | 704 W | 714 W | 95.8% of rated power | | Typical summer roof | 55 °C | 673 W | 682 W | 91.6% of rated power | | Hot roof | 70 °C | 642 W | 651 W | 87.4% of rated power | ## Against the whole database | Measure | 66HT735W | 66HT745W | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #517 | #303 | 14,005 | 66HT745W leads by 214 places | | Power density | #582 | #339 | 14,005 | 66HT745W leads by 243 places | | Heat behaviour | #1,309 | #1,309 | 14,005 | Tied - the same position in the database | | Weight | #4,262 | #3,665 | 14,005 | 66HT745W leads by 597 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #155 | #98 | 14,005 | 66HT745W leads by 57 places | ## Questions ### Which panel is better: Hanersun HN21N-66HT735W or Hanersun HN21N-66HT745W? According to our database: **Hanersun HN21N-66HT**745 W**** has higher module efficiency (**24.00%** 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-66HT745W? **Hanersun HN21N-66HT**735 W**** has a module efficiency of **23.70%**, while **Hanersun HN21N-66HT**745 W**** is **24.00%**. 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-66HT745W? **Hanersun HN21N-66HT**735 W**** uses **TOPCon** cells; **Hanersun HN21N-66HT**745 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-66HT745W? **Hanersun HN21N-66HT**735 W**** has a **30 years** power warranty; **Hanersun HN21N-66HT**745 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-66HT745W bifacial panels? Both **Hanersun HN21N-66HT**735 W**** and **Hanersun HN21N-66HT**745 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-66HT740W](https://comparepv.com/compare/hanersun-hn21n-66ht735w/hanersun-hn21n-66ht740w) - The same specification on paper - [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-66ht745w 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.