--- title: "Longi Solar LR5-66HPH-510M vs Longi Solar LR5-54HPB-410M - Solar Panel Comparison | ComparePV" description: "Compare Longi Solar LR5-66HPH-510M vs Longi Solar LR5-54HPB-410M side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/longi-green-energy-technology-co-ltd-lr5-66hph-510m/longi-lr5-54hpb-410m" updated: 2026-09-11 --- # Longi Solar LR5-66HPH-510M vs Longi Solar LR5-54HPB-410M 66HPH-510M leads on the differences that matter The largest is rated power: 100 W more power. 9 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Longi Solar LR5-66HPH-510M](https://comparepv.com/panel/longi-green-energy-technology-co-ltd-lr5-66hph-510m) | [Longi Solar LR5-54HPB-410M](https://comparepv.com/panel/longi-lr5-54hpb-410m) | | Manufacturer | Longi Solar | Longi Solar | | Power | 510 Wp | 410 Wp | | Efficiency | 21.50 % | 21.00 % | | Technology | | PERC | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 66HPH-510M | 54HPB-410M | Difference | | --- | --- | --- | --- | | Rated power | 510 Wp | 410 Wp | +100 W for 66HPH-510M | | Module efficiency | 21.50 % | 21.00 % | +0.50 pp for 66HPH-510M | | Weight | 25.3 kg | 20.8 kg | -4.5 kg for 54HPB-410M | | Open-circuit voltage | 45.85 V | 37.40 V | 8.45 V apart | | Module area | 2.373 m² | 1.953 m² | 0.421 m² apart | | Power density | 214.9 Wp/m² | 210.0 Wp/m² | +4.9 Wp/m² for 66HPH-510M | | Voltage at max power | 38.68 V | 31.42 V | 7.26 V apart | | Cell count | 132 | 108 | 24 cells apart | | Dimensions | 2093x1134x35 mm | 1722x1134x30 mm | 2093x1134x35 mm vs 1722x1134x30 mm | ## Every compared parameter | Parameter | 66HPH-510M | 54HPB-410M | | --- | --- | --- | | Rated power | 510 Wp | 410 Wp | | Module efficiency | 21.50 % | 21.00 % | | Power density | 214.9 Wp/m² | 210.0 Wp/m² | | Open-circuit voltage | 45.85 V | 37.40 V | | Voltage at max power | 38.68 V | 31.42 V | | Short-circuit current | 14.05 A | 13.84 A | | Current at max power | 13.19 A | 13.05 A | | Temperature coefficient | -0.340 %/°C | -0.340 %/°C | | Dimensions | 2093x1134x35 mm | 1722x1134x30 mm | | Module area | 2.373 m² | 1.953 m² | | Weight | 25.3 kg | 20.8 kg | | Weight per kWp | 49.6 kg/kWp | 50.7 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 | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 108 | | Bifacial | No | No | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year Same temp coeff. for both panels (-0.340 %/°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, 66HPH-510M:** 16,529 kWh - **Cumulative output, 54HPB-410M:** 13,288 kWh - **Gap:** 3,241 kWh ## Output when hot | Condition | Cell temperature | 66HPH-510M | 54HPB-410M | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 510 W | 410 W | 100.0% of rated power | | Cool, bright day | 40 °C | 484 W | 389 W | 94.9% of rated power | | Typical summer roof | 55 °C | 458 W | 368 W | 89.8% of rated power | | Hot roof | 70 °C | 432 W | 347 W | 84.7% of rated power | ## Against the whole database | Measure | 66HPH-510M | 54HPB-410M | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #7,958 | #9,758 | 14,005 | 66HPH-510M leads by 1,800 places | | Power density | #8,033 | #9,772 | 14,005 | 66HPH-510M leads by 1,739 places | | Heat behaviour | #8,778 | #8,778 | 14,005 | Tied - the same position in the database | | Weight | #3,154 | #4,132 | 14,005 | 66HPH-510M leads by 978 places | | Warranty | #9,798 | #9,798 | 14,005 | Tied - the same position in the database | | Overall | #9,133 | #11,673 | 14,005 | 66HPH-510M leads by 2,540 places | ## Questions ### Which panel is better: Longi Solar LR5-66HPH-510M or Longi Solar LR5-54HPB-410M? According to our database: **Longi Solar LR5-66HPH-510M** has higher module efficiency (**21.50%** vs **21.00%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Longi Solar LR5-66HPH-510M and Longi Solar LR5-54HPB-410M? **Longi Solar LR5-66HPH-510M** has a module efficiency of **21.50%**, while **Longi Solar LR5-54HPB-410M** is **21.00%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Longi Solar LR5-66HPH-510M use vs Longi Solar LR5-54HPB-410M? **Longi Solar LR5-66HPH-510M** uses Monocrystalline cells; **Longi Solar LR5-54HPB-410M** 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-510M and Longi Solar LR5-54HPB-410M? **Longi Solar LR5-66HPH-510M** has a **25 years** power warranty; **Longi Solar LR5-54HPB-410M** 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-510M vs Longi Solar LR5-72HPH-565M](https://comparepv.com/compare/longi-green-energy-technology-co-ltd-lr5-66hph-510m/longi-lr5-72hph-565m) - 9 differences, the largest is rated power - [Longi Solar LR5-66HPH-510M vs Longi Solar LR5-72HPH-560M](https://comparepv.com/compare/longi-green-energy-technology-co-ltd-lr5-66hph-510m/longi-lr5-72hph-560m) - 8 differences, the largest is rated power - [Longi Solar LR5-66HPH-510M vs Longi Solar LR5-72HPH-555M](https://comparepv.com/compare/longi-green-energy-technology-co-ltd-lr5-66hph-510m/longi-lr5-72hph-555m) - 7 differences, the largest is rated power - [Longi Solar LR5-66HPH-510M vs Longi Solar LR5-72HPH-550M](https://comparepv.com/compare/longi-green-energy-technology-co-ltd-lr5-66hph-510m/longi-lr5-72hph-550m) - 8 differences, the largest is rated power - [Longi Solar LR5-66HPH-510M vs Longi Solar LR5-72HPH-545M](https://comparepv.com/compare/longi-green-energy-technology-co-ltd-lr5-66hph-510m/longi-lr5-72hph-545m) - 9 differences, the largest is rated power - [Longi Solar LR5-66HPH-510M vs Longi Solar LR5-66HPH-515M](https://comparepv.com/compare/longi-green-energy-technology-co-ltd-lr5-66hph-510m/longi-green-energy-technology-co-ltd-lr5-66hph-515m) - One difference: module efficiency --- Source: https://comparepv.com/compare/longi-green-energy-technology-co-ltd-lr5-66hph-510m/longi-lr5-54hpb-410m 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.