--- title: "Longi Solar LR7-60HVH-540M vs Longi Solar LR7-60HVH-555M - Solar Panel Comparison | ComparePV" description: "Compare Longi Solar LR7-60HVH-540M vs Longi Solar LR7-60HVH-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-lr7-60hvh-540m/longi-lr7-60hvh-555m" updated: 2026-09-11 --- # Longi Solar LR7-60HVH-540M vs Longi Solar LR7-60HVH-555M 555M leads on the differences that matter The largest is module efficiency: 0.70 pp more efficient. 16 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Longi Solar LR7-60HVH-540M](https://comparepv.com/panel/longi-lr7-60hvh-540m) | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | | Manufacturer | Longi Solar | Longi Solar | | Power | 540 Wp | 555 Wp | | Efficiency | 23.90 % | 24.60 % | | Technology | N-type | N-type | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 540M | 555M | Difference | | --- | --- | --- | --- | | Module efficiency | 23.90 % | 24.60 % | +0.70 pp for 555M | | Power density | 239.3 Wp/m² | 245.9 Wp/m² | +6.6 Wp/m² for 555M | | Rated power | 540 Wp | 555 Wp | +15 W for 555M | ## Every compared parameter | Parameter | 540M | 555M | | --- | --- | --- | | Rated power | 540 Wp | 555 Wp | | Module efficiency | 23.90 % | 24.60 % | | Power density | 239.3 Wp/m² | 245.9 Wp/m² | | Open-circuit voltage | 44.88 V | 45.18 V | | Voltage at max power | 37.11 V | 37.41 V | | Short-circuit current | 15.25 A | 15.55 A | | Current at max power | 14.55 A | 14.84 A | | Temperature coefficient | -0.260 %/°C | -0.260 %/°C | | Dimensions | 1990x1134x30 mm | 1990x1134x30 mm | | Module area | 2.257 m² | 2.257 m² | | Weight | 25.0 kg | 25.0 kg | | Weight per kWp | 46.3 kg/kWp | 45.0 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.35 %/yr | 0.35 %/yr | | Cell technology | N-type | N-type | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 120 | 120 | | 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 (-0.260 %/°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, 540M:** 18,259 kWh - **Cumulative output, 555M:** 18,766 kWh - **Gap:** 507 kWh ## Output when hot | Condition | Cell temperature | 540M | 555M | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 540 W | 555 W | 100.0% of rated power | | Cool, bright day | 40 °C | 519 W | 533 W | 96.1% of rated power | | Typical summer roof | 55 °C | 498 W | 512 W | 92.2% of rated power | | Hot roof | 70 °C | 477 W | 490 W | 88.3% of rated power | ## Against the whole database | Measure | 540M | 555M | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #351 | #51 | 14,005 | 555M leads by 300 places | | Power density | #353 | #70 | 14,005 | 555M leads by 283 places | | Heat behaviour | #511 | #511 | 14,005 | Tied - the same position in the database | | Weight | #1,110 | #604 | 14,005 | 555M leads by 506 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #3,521 | #2,248 | 14,005 | 555M leads by 1,273 places | ## Questions ### Which panel is better: Longi Solar LR7-60HVH-540M or Longi Solar LR7-60HVH-555M? According to our database: **Longi Solar LR7-60HVH-555M** has higher module efficiency (**24.60%** vs **23.90%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Longi Solar LR7-60HVH-540M and Longi Solar LR7-60HVH-555M? **Longi Solar LR7-60HVH-540M** has a module efficiency of **23.90%**, while **Longi Solar LR7-60HVH-555M** is **24.60%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Longi Solar LR7-60HVH-540M use vs Longi Solar LR7-60HVH-555M? **Longi Solar LR7-60HVH-540M** uses **N-type** cells; **Longi Solar LR7-60HVH-555M** 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 LR7-60HVH-540M and Longi Solar LR7-60HVH-555M? **Longi Solar LR7-60HVH-540M** has a **30 years** power warranty; **Longi Solar LR7-60HVH-555M** 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. ## Related comparisons - [Longi Solar LR7-60HVH-540M vs Longi Solar LR7-60HVH-560M](https://comparepv.com/compare/longi-lr7-60hvh-540m/longi-lr7-60hvh-560m) - 3 differences, the largest is module efficiency - [Longi Solar LR7-60HVH-540M vs Longi Solar LR7-60HVH-550M](https://comparepv.com/compare/longi-lr7-60hvh-540m/longi-lr7-60hvh-550m) - 3 differences, the largest is module efficiency - [Longi Solar LR7-60HVH-540M vs Longi Solar LR7-60HVH-545M](https://comparepv.com/compare/longi-lr7-60hvh-540m/longi-lr7-60hvh-545m) - One difference: module efficiency - [Longi Solar LR7-60HVH-540M vs Longi Solar LR7-60HVH-535M](https://comparepv.com/compare/longi-lr7-60hvh-540m/longi-lr7-60hvh-535m) - One difference: module efficiency - [Longi Solar LR7-60HVH-540M vs Longi Solar LR7-72HVHF-670M](https://comparepv.com/compare/longi-lr7-60hvh-540m/longi-lr7-72hvhf-670m) - 10 differences, the largest is module efficiency - [Longi Solar LR7-60HVH-540M vs Longi Solar LR8-66HYD-670M](https://comparepv.com/compare/longi-lr7-60hvh-540m/longi-lr8-66hyd-670m) - 15 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/longi-lr7-60hvh-540m/longi-lr7-60hvh-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.