--- title: "Longi Solar LR7-54HJD-510M vs Longi Solar LR7-72HVHF-665M - Solar Panel Comparison | ComparePV" description: "Compare Longi Solar LR7-54HJD-510M vs Longi Solar LR7-72HVHF-665M side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/longi-lr7-54hjd-510m/longi-lr7-72hvhf-665m" updated: 2026-09-11 --- # Longi Solar LR7-54HJD-510M vs Longi Solar LR7-72HVHF-665M 54HJD-510M leads on the differences that matter The largest is rated power: 155 W more power. 5 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | [Longi Solar LR7-72HVHF-665M](https://comparepv.com/panel/longi-lr7-72hvhf-665m) | | Manufacturer | Longi Solar | Longi Solar | | Power | 510 Wp | 665 Wp | | Efficiency | 25.00 % | 24.60 % | | Technology | Back Contact | N-type | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 54HJD-510M | 72HVHF-665M | Difference | | --- | --- | --- | --- | | Rated power | 510 Wp | 665 Wp | +155 W for 72HVHF-665M | | Weight | 23.5 kg | 28.5 kg | -5.0 kg for 54HJD-510M | | Product warranty | 30 yrs | 15 yrs | +15 yrs for 54HJD-510M | | Temperature coefficient | -0.240 %/°C | -0.260 %/°C | +0.020 %/°C for 54HJD-510M | | Module efficiency | 25.00 % | 24.60 % | +0.40 pp for 54HJD-510M | | Open-circuit voltage | 41.55 V | 54.20 V | 12.65 V apart | | Module area | 2.041 m² | 2.701 m² | 0.660 m² apart | | Cell technology | Back Contact | N-type | Back Contact vs N-type | | Power density | 249.9 Wp/m² | 246.2 Wp/m² | +3.7 Wp/m² for 54HJD-510M | | Weight per kWp | 46.1 kg/kWp | 42.9 kg/kWp | -3.2 kg/kWp for 72HVHF-665M | | Voltage at max power | 34.37 V | 44.86 V | 10.49 V apart | | Cell count | 108 | 144 | 36 cells apart | | Bifacial | Yes | No | Yes vs No | | Dimensions | 1800x1134x30 mm | 2382x1134x30 mm | 1800x1134x30 mm vs 2382x1134x30 mm | ## Every compared parameter | Parameter | 54HJD-510M | 72HVHF-665M | | --- | --- | --- | | Rated power | 510 Wp | 665 Wp | | Module efficiency | 25.00 % | 24.60 % | | Power density | 249.9 Wp/m² | 246.2 Wp/m² | | Open-circuit voltage | 41.55 V | 54.20 V | | Voltage at max power | 34.37 V | 44.86 V | | Short-circuit current | 15.52 A | 15.52 A | | Current at max power | 14.84 A | 14.83 A | | Temperature coefficient | -0.240 %/°C | -0.260 %/°C | | Dimensions | 1800x1134x30 mm | 2382x1134x30 mm | | Module area | 2.041 m² | 2.701 m² | | Weight | 23.5 kg | 28.5 kg | | Weight per kWp | 46.1 kg/kWp | 42.9 kg/kWp | | Product warranty | 30 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.35 %/yr | 0.35 %/yr | | Cell technology | Back Contact | N-type | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 108 | 144 | | Bifacial | Yes | No | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year - **Cumulative output, 54HJD-510M:** 17,245 kWh - **Cumulative output, 72HVHF-665M:** 22,486 kWh - **Gap:** 5,241 kWh ## Output when hot | Condition | Cell temperature | 54HJD-510M | 72HVHF-665M | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 510 W | 665 W | 100.0% of rated power | | Cool, bright day | 40 °C | 492 W | 639 W | 96.1% of rated power | | Typical summer roof | 55 °C | 473 W | 613 W | 92.2% of rated power | | Hot roof | 70 °C | 455 W | 587 W | 88.3% of rated power | ## Against the whole database | Measure | 54HJD-510M | 72HVHF-665M | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #4 | #51 | 14,005 | 54HJD-510M leads by 47 places | | Power density | #7 | #42 | 14,005 | 54HJD-510M leads by 35 places | | Heat behaviour | #13 | #511 | 14,005 | 54HJD-510M leads by 498 places | | Weight | #979 | #244 | 14,005 | 72HVHF-665M leads by 735 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #1,144 | #387 | 14,005 | 72HVHF-665M leads by 757 places | ## Questions ### Which panel is better: Longi Solar LR7-54HJD-510M or Longi Solar LR7-72HVHF-665M? According to our database: **Longi Solar LR7-54HJD-510M** has higher module efficiency (**25.00%** vs **24.60%**); **Longi Solar LR7-54HJD-510M** tolerates heat better (temp coeff **-0.240%/°C** vs **-0.260%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Longi Solar LR7-54HJD-510M and Longi Solar LR7-72HVHF-665M? **Longi Solar LR7-54HJD-510M** has a module efficiency of **25.00%**, while **Longi Solar LR7-72HVHF-665M** is **24.60%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Longi Solar LR7-54HJD-510M use vs Longi Solar LR7-72HVHF-665M? **Longi Solar LR7-54HJD-510M** uses **Back Contact** cells; **Longi Solar LR7-72HVHF-665M** uses **N-type**. 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 LR7-54HJD-510M and Longi Solar LR7-72HVHF-665M? **Longi Solar LR7-54HJD-510M** has a **30 years** power warranty; **Longi Solar LR7-72HVHF-665M** 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 Longi Solar LR7-54HJD-510M and Longi Solar LR7-72HVHF-665M bifacial panels? **Longi Solar LR7-54HJD-510M** is bifacial (captures light from both faces); **Longi Solar LR7-72HVHF-665M** is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath. ## Related comparisons - [Longi Solar LR7-54HJD-510M vs Longi Solar LR7-54HJD-505M](https://comparepv.com/compare/longi-lr7-54hjd-510m/longi-lr7-54hjd-505m) - One difference: module efficiency - [Longi Solar LR7-54HJD-510M vs Longi Solar LR7-54HJD-500M](https://comparepv.com/compare/longi-lr7-54hjd-510m/longi-lr7-54hjd-500m) - 3 differences, the largest is module efficiency - [Longi Solar LR7-54HJD-510M vs Longi Solar LR7-54HJD-495M](https://comparepv.com/compare/longi-lr7-54hjd-510m/longi-lr7-54hjd-495m) - 3 differences, the largest is module efficiency - [Longi Solar LR7-72HVHF-665M vs Longi Solar LR7-72HVHF-670M](https://comparepv.com/compare/longi-lr7-72hvhf-665m/longi-lr7-72hvhf-670m) - One difference: module efficiency - [Longi Solar LR7-72HVHF-665M vs Longi Solar LR7-72HVHF-660M](https://comparepv.com/compare/longi-lr7-72hvhf-665m/longi-lr7-72hvhf-660m) - One difference: module efficiency - [Longi Solar LR7-72HVHF-665M vs Longi Solar LR7-72HVHF-655M](https://comparepv.com/compare/longi-lr7-72hvhf-665m/longi-lr7-72hvhf-655m) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/longi-lr7-54hjd-510m/longi-lr7-72hvhf-665m 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.