--- title: "Hanersun HN21RN-66QT655W vs Hanersun HN21RN-66QT660W - Solar Panel Comparison | ComparePV" description: "Compare Hanersun HN21RN-66QT655W vs Hanersun HN21RN-66QT660W side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/hanersun-hn21rn-66qt655w/hanersun-hn21rn-66qt660w" updated: 2026-09-11 --- # Hanersun HN21RN-66QT655W vs Hanersun HN21RN-66QT660W 66QT660W leads on the differences that matter The largest is module efficiency: 0.20 pp more efficient. 18 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Hanersun HN21RN-66QT655W](https://comparepv.com/panel/hanersun-hn21rn-66qt655w) | [Hanersun HN21RN-66QT660W](https://comparepv.com/panel/hanersun-hn21rn-66qt660w) | | Manufacturer | Hanersun | Hanersun | | Power | 655 Wp | 660 Wp | | Efficiency | 24.20 % | 24.40 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 66QT655W | 66QT660W | Difference | | --- | --- | --- | --- | | Module efficiency | 24.20 % | 24.40 % | +0.20 pp for 66QT660W | ## Every compared parameter | Parameter | 66QT655W | 66QT660W | | --- | --- | --- | | Rated power | 655 Wp | 660 Wp | | Module efficiency | 24.20 % | 24.40 % | | Power density | 242.5 Wp/m² | 244.3 Wp/m² | | Open-circuit voltage | 50.48 V | 50.60 V | | Voltage at max power | 42.24 V | 42.35 V | | Short-circuit current | 16.43 A | 16.50 A | | Current at max power | 15.51 A | 15.59 A | | Temperature coefficient | -0.260 %/°C | -0.260 %/°C | | Dimensions | 2382x1134x30 mm | 2382x1134x30 mm | | Module area | 2.701 m² | 2.701 m² | | Weight | 32.5 kg | 32.5 kg | | Weight per kWp | 49.6 kg/kWp | 49.2 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.35 %/yr | 0.35 %/yr | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 264 | 264 | | 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 (-0.260 %/°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, 66QT655W:** 22,148 kWh - **Cumulative output, 66QT660W:** 22,317 kWh - **Gap:** 169 kWh ## Output when hot | Condition | Cell temperature | 66QT655W | 66QT660W | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 655 W | 660 W | 100.0% of rated power | | Cool, bright day | 40 °C | 629 W | 634 W | 96.1% of rated power | | Typical summer roof | 55 °C | 604 W | 609 W | 92.2% of rated power | | Hot roof | 70 °C | 578 W | 583 W | 88.3% of rated power | ## Against the whole database | Measure | 66QT655W | 66QT660W | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #184 | #99 | 14,005 | 66QT660W leads by 85 places | | Power density | #172 | #88 | 14,005 | 66QT660W leads by 84 places | | Heat behaviour | #511 | #511 | 14,005 | Tied - the same position in the database | | Weight | #3,162 | #2,811 | 14,005 | 66QT660W leads by 351 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #738 | #569 | 14,005 | 66QT660W leads by 169 places | ## Questions ### Which panel is better: Hanersun HN21RN-66QT655W or Hanersun HN21RN-66QT660W? According to our database: **Hanersun HN21RN-66QT**660 W**** has higher module efficiency (**24.40%** vs **24.20%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Hanersun HN21RN-66QT655W and Hanersun HN21RN-66QT660W? **Hanersun HN21RN-66QT**655 W**** has a module efficiency of **24.20%**, while **Hanersun HN21RN-66QT**660 W**** is **24.40%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Hanersun HN21RN-66QT655W use vs Hanersun HN21RN-66QT660W? **Hanersun HN21RN-66QT**655 W**** uses **TOPCon** cells; **Hanersun HN21RN-66QT**660 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 HN21RN-66QT655W and Hanersun HN21RN-66QT660W? **Hanersun HN21RN-66QT**655 W**** has a **30 years** power warranty; **Hanersun HN21RN-66QT**660 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 HN21RN-66QT655W and Hanersun HN21RN-66QT660W bifacial panels? Both **Hanersun HN21RN-66QT**655 W**** and **Hanersun HN21RN-66QT**660 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 HN21RN-66QT655W vs Hanersun HN21N-66HT750W](https://comparepv.com/compare/hanersun-hn21rn-66qt655w/hanersun-hn21n-66ht750w) - 9 differences, the largest is rated power - [Hanersun HN21RN-66QT655W vs Hanersun HN21N-66HT745W](https://comparepv.com/compare/hanersun-hn21rn-66qt655w/hanersun-hn21n-66ht745w) - 10 differences, the largest is rated power - [Hanersun HN21RN-66QT655W vs Hanersun HN21N-66HT740W](https://comparepv.com/compare/hanersun-hn21rn-66qt655w/hanersun-hn21n-66ht740w) - 11 differences, the largest is rated power - [Hanersun HN21RN-66QT655W vs Hanersun HN21N-66HT735W](https://comparepv.com/compare/hanersun-hn21rn-66qt655w/hanersun-hn21n-66ht735w) - 11 differences, the largest is rated power - [Hanersun HN21RN-66QT655W vs Hanersun HN21RN-66QT670W](https://comparepv.com/compare/hanersun-hn21rn-66qt655w/hanersun-hn21rn-66qt670w) - 3 differences, the largest is module efficiency - [Hanersun HN21RN-66QT655W vs Hanersun HN21RN-66QT665W](https://comparepv.com/compare/hanersun-hn21rn-66qt655w/hanersun-hn21rn-66qt665w) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/hanersun-hn21rn-66qt655w/hanersun-hn21rn-66qt660w 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.