--- title: "Longi Solar LR5-66HPH-495M vs Longi Solar LR5-72HPH-555M - Solar Panel Comparison | ComparePV" description: "Compare Longi Solar LR5-66HPH-495M vs Longi Solar LR5-72HPH-555M side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/longi-lr5-66hph-495m/longi-lr5-72hph-555m" updated: 2026-09-11 --- # Longi Solar LR5-66HPH-495M vs Longi Solar LR5-72HPH-555M 72HPH-555M leads on the differences that matter The largest is rated power: 60 W more power. 9 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Longi Solar LR5-66HPH-495M](https://comparepv.com/panel/longi-lr5-66hph-495m) | [Longi Solar LR5-72HPH-555M](https://comparepv.com/panel/longi-lr5-72hph-555m) | | Manufacturer | Longi Solar | Longi Solar | | Power | 495 Wp | 555 Wp | | Efficiency | 21.10 % | 21.50 % | | Technology | PERC | PERC | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 66HPH-495M | 72HPH-555M | Difference | | --- | --- | --- | --- | | Rated power | 495 Wp | 555 Wp | +60 W for 72HPH-555M | | Module efficiency | 21.10 % | 21.50 % | +0.40 pp for 72HPH-555M | | Open-circuit voltage | 45.40 V | 49.95 V | 4.55 V apart | | Module area | 2.349 m² | 2.583 m² | 0.235 m² apart | | Weight | 25.1 kg | 27.5 kg | -2.4 kg for 66HPH-495M | | Power density | 210.8 Wp/m² | 214.8 Wp/m² | +4.1 Wp/m² for 72HPH-555M | | Temperature coefficient | -0.350 %/°C | -0.340 %/°C | +0.010 %/°C for 72HPH-555M | | Cell count | 132 | 144 | 12 cells apart | | Voltage at max power | 38.23 V | 42.10 V | 3.87 V apart | | Dimensions | 2073x1133x35 mm | 2278x1134x35 mm | 2073x1133x35 mm vs 2278x1134x35 mm | ## Every compared parameter | Parameter | 66HPH-495M | 72HPH-555M | | --- | --- | --- | | Rated power | 495 Wp | 555 Wp | | Module efficiency | 21.10 % | 21.50 % | | Power density | 210.8 Wp/m² | 214.8 Wp/m² | | Open-circuit voltage | 45.40 V | 49.95 V | | Voltage at max power | 38.23 V | 42.10 V | | Short-circuit current | 13.82 A | 14.04 A | | Current at max power | 12.95 A | 13.19 A | | Temperature coefficient | -0.350 %/°C | -0.340 %/°C | | Dimensions | 2073x1133x35 mm | 2278x1134x35 mm | | Module area | 2.349 m² | 2.583 m² | | Weight | 25.1 kg | 27.5 kg | | Weight per kWp | 50.7 kg/kWp | 49.5 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 25 yrs | 25 yrs | | Annual degradation | 0.55 %/yr | 0.55 %/yr | | Cell technology | PERC | PERC | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 144 | | Bifacial | No | No | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year - **Cumulative output, 66HPH-495M:** 16,042 kWh - **Cumulative output, 72HPH-555M:** 17,987 kWh - **Gap:** 1,945 kWh ## Output when hot | Condition | Cell temperature | 66HPH-495M | 72HPH-555M | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 495 W | 555 W | 100.0% of rated power | | Cool, bright day | 40 °C | 469 W | 527 W | 94.8% of rated power | | Typical summer roof | 55 °C | 443 W | 498 W | 89.5% of rated power | | Hot roof | 70 °C | 417 W | 470 W | 84.2% of rated power | ## Against the whole database | Measure | 66HPH-495M | 72HPH-555M | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #9,297 | #7,958 | 14,005 | 72HPH-555M leads by 1,339 places | | Power density | #9,554 | #8,034 | 14,005 | 72HPH-555M leads by 1,520 places | | Heat behaviour | #10,419 | #8,778 | 14,005 | 72HPH-555M leads by 1,641 places | | Weight | #4,122 | #3,116 | 14,005 | 72HPH-555M leads by 1,006 places | | Warranty | #9,798 | #9,798 | 14,005 | Tied - the same position in the database | | Overall | #9,945 | #7,542 | 14,005 | 72HPH-555M leads by 2,403 places | ## Questions ### Which panel is better: Longi Solar LR5-66HPH-495M or Longi Solar LR5-72HPH-555M? According to our database: **Longi Solar LR5-72HPH-555M** has higher module efficiency (**21.50%** vs **21.10%**); **Longi Solar LR5-72HPH-555M** tolerates heat better (temp coeff **-0.340%/°C** vs **-0.350%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Longi Solar LR5-66HPH-495M and Longi Solar LR5-72HPH-555M? **Longi Solar LR5-66HPH-495M** has a module efficiency of **21.10%**, while **Longi Solar LR5-72HPH-555M** is **21.50%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Longi Solar LR5-66HPH-495M use vs Longi Solar LR5-72HPH-555M? **Longi Solar LR5-66HPH-495M** uses **PERC** cells; **Longi Solar LR5-72HPH-555M** uses **PERC**. 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 Longi Solar LR5-66HPH-495M and Longi Solar LR5-72HPH-555M? **Longi Solar LR5-66HPH-495M** has a **25 years** power warranty; **Longi Solar LR5-72HPH-555M** has a **25 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. ## Related comparisons - [Longi Solar LR5-66HPH-495M vs Longi Solar LR5-72HPH-565M](https://comparepv.com/compare/longi-lr5-66hph-495m/longi-lr5-72hph-565m) - 11 differences, the largest is module efficiency - [Longi Solar LR5-66HPH-495M vs Longi Solar LR5-72HPH-560M](https://comparepv.com/compare/longi-lr5-66hph-495m/longi-lr5-72hph-560m) - 10 differences, the largest is rated power - [Longi Solar LR5-66HPH-495M vs Longi Solar LR5-72HPH-550M](https://comparepv.com/compare/longi-lr5-66hph-495m/longi-lr5-72hph-550m) - 9 differences, the largest is rated power - [Longi Solar LR5-66HPH-495M vs Longi Solar LR5-72HPH-545M](https://comparepv.com/compare/longi-lr5-66hph-495m/longi-lr5-72hph-545m) - 8 differences, the largest is rated power - [Longi Solar LR5-66HPH-495M vs Longi Solar LR5-66HPH-515M](https://comparepv.com/compare/longi-lr5-66hph-495m/longi-green-energy-technology-co-ltd-lr5-66hph-515m) - 6 differences, the largest is module efficiency - [Longi Solar LR5-66HPH-495M vs Longi Solar LR5-66HPH-510M](https://comparepv.com/compare/longi-lr5-66hph-495m/longi-green-energy-technology-co-ltd-lr5-66hph-510m) - 6 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/longi-lr5-66hph-495m/longi-lr5-72hph-555m 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.