--- title: "Hanersun HN18-72H575W vs Hanersun HN21N-66HT740W - Solar Panel Comparison | ComparePV" description: "Compare Hanersun HN18-72H575W 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-hn18-72h575w/hanersun-hn21n-66ht740w" image: "https://comparepv.com/og/compare/panels/hanersun-hn18-72h575w/hanersun-hn21n-66ht740w.png" updated: 2026-09-11 --- # Hanersun HN18-72H575W vs Hanersun HN21N-66HT740W HN21N-66HT740W leads on the differences that matter The largest is module efficiency: 1.54 pp more efficient. 4 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Hanersun HN18-72H575W](https://comparepv.com/panel/hanersun-hn18-72h575w) | [Hanersun HN21N-66HT740W](https://comparepv.com/panel/hanersun-hn21n-66ht740w) | | Manufacturer | Hanersun | Hanersun | | Power | 575 Wp | 740 Wp | | Efficiency | 22.26 % | 23.80 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | HN18-72H575W | HN21N-66HT740W | Difference | | --- | --- | --- | --- | | Module efficiency | 22.26 % | 23.80 % | +1.54 pp for HN21N-66HT740W | | Rated power | 575 Wp | 740 Wp | +165 W for HN21N-66HT740W | | Power density | 222.6 Wp/m² | 238.2 Wp/m² | +15.6 Wp/m² for HN21N-66HT740W | | Performance warranty | 25 yrs | 30 yrs | +5 yrs for HN21N-66HT740W | | Temperature coefficient | -0.310 %/°C | -0.280 %/°C | +0.030 %/°C for HN21N-66HT740W | | Weight | 28.5 kg | 37.4 kg | -8.9 kg for HN18-72H575W | | Product warranty | 12 yrs | 15 yrs | +3 yrs for HN21N-66HT740W | | Short-circuit current | 14.17 A | 18.66 A | 4.49 A apart | | Module area | 2.583 m² | 3.106 m² | 0.523 m² apart | | Current at max power | 13.38 A | 17.66 A | 4.28 A apart | | Cell count | 144 | 132 | 12 cells apart | | Bifacial | No | Yes | No vs Yes | | Open-circuit voltage | 51.20 V | 49.80 V | 1.40 V apart | | Dimensions | 2278x1134x30 mm | 2384x1303x33 mm | 2278x1134x30 mm vs 2384x1303x33 mm | | Voltage at max power | 43.00 V | 41.92 V | 1.08 V apart | ## Every compared parameter | Parameter | HN18-72H575W | HN21N-66HT740W | | --- | --- | --- | | Rated power | 575 Wp | 740 Wp | | Module efficiency | 22.26 % | 23.80 % | | Power density | 222.6 Wp/m² | 238.2 Wp/m² | | Open-circuit voltage | 51.20 V | 49.80 V | | Voltage at max power | 43.00 V | 41.92 V | | Short-circuit current | 14.17 A | 18.66 A | | Current at max power | 13.38 A | 17.66 A | | Temperature coefficient | -0.310 %/°C | -0.280 %/°C | | Dimensions | 2278x1134x30 mm | 2384x1303x33 mm | | Module area | 2.583 m² | 3.106 m² | | Weight | 28.5 kg | 37.4 kg | | Weight per kWp | 49.6 kg/kWp | 50.5 kg/kWp | | Product warranty | 12 yrs | 15 yrs | | Performance warranty | 25 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 144 | 132 | | Bifacial | No | Yes | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year - **Cumulative output, HN18-72H575W:** 19,292 kWh - **Cumulative output, HN21N-66HT740W:** 24,828 kWh - **Gap:** 5,536 kWh ## Output when hot | Condition | Cell temperature | HN18-72H575W | HN21N-66HT740W | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 575 W | 740 W | 100.0% of rated power | | Cool, bright day | 40 °C | 548 W | 709 W | 95.3% of rated power | | Typical summer roof | 55 °C | 522 W | 678 W | 90.7% of rated power | | Hot roof | 70 °C | 495 W | 647 W | 86.0% of rated power | ## Against the whole database | Measure | HN18-72H575W | HN21N-66HT740W | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #5,656 | #462 | 14,129 | HN21N-66HT740W leads by 5,194 places | | Power density | #5,612 | #460 | 14,129 | HN21N-66HT740W leads by 5,152 places | | Heat behaviour | #8,069 | #1,347 | 14,129 | HN21N-66HT740W leads by 6,722 places | | Weight | #3,142 | #3,944 | 14,129 | HN18-72H575W leads by 802 places | | Warranty | #9,912 | #21 | 14,129 | HN21N-66HT740W leads by 9,891 places | | Overall | #5,917 | #130 | 14,129 | HN21N-66HT740W leads by 5,787 places | ## Questions ### Which panel is better: Hanersun HN18-72H575W or Hanersun HN21N-66HT740W? According to our database: **Hanersun HN21N-66HT**740 W**** has higher module efficiency (**23.80%** vs **22.26%**); **Hanersun HN21N-66HT**740 W**** tolerates heat better (temp coeff **-0.280%/°C** vs **-0.310%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Hanersun HN18-72H575W and Hanersun HN21N-66HT740W? **Hanersun HN18-72H**575 W**** has a module efficiency of **22.26%**, 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 HN18-72H575W use vs Hanersun HN21N-66HT740W? **Hanersun HN18-72H**575 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 HN18-72H575W and Hanersun HN21N-66HT740W? **Hanersun HN18-72H**575 W**** has a **25 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 HN18-72H575W and Hanersun HN21N-66HT740W bifacial panels? **Hanersun HN21N-66HT**740 W**** is bifacial (captures light from both faces); **Hanersun HN18-72H**575 W**** is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath. ## Related comparisons - [Hanersun HN18-72H575W vs Hanersun HN18-72H585W](https://comparepv.com/compare/hanersun-hn18-72h575w/hanersun-hn18-72h585w) - 3 differences, the largest is module efficiency - [Hanersun HN18-72H575W vs Hanersun HN18-72H580W](https://comparepv.com/compare/hanersun-hn18-72h575w/hanersun-hn18-72h580w) - The same specification on paper - [Hanersun HN18-72H575W vs Hanersun HN18-72H570W](https://comparepv.com/compare/hanersun-hn18-72h575w/hanersun-hn18-72h570w) - The same specification on paper - [Hanersun HN18-72H575W vs Hanersun HN18-72H565W](https://comparepv.com/compare/hanersun-hn18-72h575w/hanersun-hn18-72h565w) - 3 differences, the largest is module efficiency - [Hanersun HN21N-66HT740W vs Hanersun HN21N-66HT750W](https://comparepv.com/compare/hanersun-hn21n-66ht740w/hanersun-hn21n-66ht750w) - 3 differences, the largest is module efficiency - [Hanersun HN21N-66HT740W vs Hanersun HN21N-66HT745W](https://comparepv.com/compare/hanersun-hn21n-66ht740w/hanersun-hn21n-66ht745w) - One difference: module efficiency --- Source: https://comparepv.com/compare/hanersun-hn18-72h575w/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.