--- title: "Leapton LP182*199-M-66-NB 590W vs Longi Solar LR8-66HGD-620M - Solar Panel Comparison | ComparePV" description: "Compare Leapton LP182*199-M-66-NB 590W vs Longi Solar LR8-66HGD-620M side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/leapton-lp182-199-m-66-nb-590w/longi-lr8-66hgd-620m" updated: 2026-09-11 --- # Leapton LP182\*199-M-66-NB 590W vs Longi Solar LR8-66HGD-620M LR8-66HGD-620M leads on the differences that matter The largest is rated power: 30 W more power. 11 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Leapton LP182\*199-M-66-NB 590W](https://comparepv.com/panel/leapton-lp182-199-m-66-nb-590w) | [Longi Solar LR8-66HGD-620M](https://comparepv.com/panel/longi-lr8-66hgd-620m) | | Manufacturer | Leapton | Longi Solar | | Power | 590 Wp | 620 Wp | | Efficiency | 22.83 % | 23.00 % | | Technology | TOPCon | Back Contact | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | LP182\*199-M-66-NB 590W | LR8-66HGD-620M | Difference | | --- | --- | --- | --- | | Rated power | 590 Wp | 620 Wp | +30 W for LR8-66HGD-620M | | Product warranty | 25 yrs | 12 yrs | +13 yrs for LP182\*199-M-66-NB 590W | | Temperature coefficient | -0.300 %/°C | -0.280 %/°C | +0.020 %/°C for LR8-66HGD-620M | | Module area | 2.584 m² | 2.701 m² | 0.117 m² apart | | Cell technology | TOPCon | Back Contact | TOPCon vs Back Contact | | Short-circuit current | 15.32 A | 16.05 A | 0.73 A apart | | Dimensions | 2279x1134x30 mm | 2382x1134x30 mm | 2279x1134x30 mm vs 2382x1134x30 mm | | Current at max power | 14.49 A | 15.16 A | 0.67 A apart | ## Every compared parameter | Parameter | LP182\*199-M-66-NB 590W | LR8-66HGD-620M | | --- | --- | --- | | Rated power | 590 Wp | 620 Wp | | Module efficiency | 22.83 % | 23.00 % | | Power density | 228.3 Wp/m² | 229.5 Wp/m² | | Open-circuit voltage | 48.62 V | 48.78 V | | Voltage at max power | 40.72 V | 40.91 V | | Short-circuit current | 15.32 A | 16.05 A | | Current at max power | 14.49 A | 15.16 A | | Temperature coefficient | -0.300 %/°C | -0.280 %/°C | | Dimensions | 2279x1134x30 mm | 2382x1134x30 mm | | Module area | 2.584 m² | 2.701 m² | | Weight | 32.0 kg | 32.5 kg | | Weight per kWp | 54.2 kg/kWp | 52.4 kg/kWp | | Product warranty | 25 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | TOPCon | Back Contact | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 132 | | Bifacial | Yes | Yes | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year - **Cumulative output, LP182\*199-M-66-NB 590W:** 19,796 kWh - **Cumulative output, LR8-66HGD-620M:** 20,802 kWh - **Gap:** 1,006 kWh ## Output when hot | Condition | Cell temperature | LP182\*199-M-66-NB 590W | LR8-66HGD-620M | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 590 W | 620 W | 100.0% of rated power | | Cool, bright day | 40 °C | 563 W | 594 W | 95.5% of rated power | | Typical summer roof | 55 °C | 537 W | 568 W | 91.0% of rated power | | Hot roof | 70 °C | 510 W | 542 W | 86.5% of rated power | ## Against the whole database | Measure | LP182\*199-M-66-NB 590W | LR8-66HGD-620M | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #2,683 | #1,919 | 14,005 | LR8-66HGD-620M leads by 764 places | | Power density | #2,731 | #2,191 | 14,005 | LR8-66HGD-620M leads by 540 places | | Heat behaviour | #6,093 | #1,309 | 14,005 | LR8-66HGD-620M leads by 4,784 places | | Weight | #8,477 | #5,893 | 14,005 | LR8-66HGD-620M leads by 2,584 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #1,591 | #2,525 | 14,005 | LP182\*199-M-66-NB 590W leads by 934 places | ## Questions ### Which panel is better: Leapton LP182\*199-M-66-NB 590W or Longi Solar LR8-66HGD-620M? According to our database: **Longi Solar LR8-66HGD-620M** has higher module efficiency (**23.00%** vs **22.83%**); **Longi Solar LR8-66HGD-620M** tolerates heat better (temp coeff **-0.280%/°C** vs **-0.300%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Leapton LP182\*199-M-66-NB 590W and Longi Solar LR8-66HGD-620M? **Leapton LP182\*199-M-66-NB **590 W**** has a module efficiency of **22.83%**, while **Longi Solar LR8-66HGD-620M** is **23.00%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Leapton LP182\*199-M-66-NB 590W use vs Longi Solar LR8-66HGD-620M? **Leapton LP182\*199-M-66-NB **590 W**** uses **TOPCon** cells; **Longi Solar LR8-66HGD-620M** uses **Back Contact**. 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 Leapton LP182\*199-M-66-NB 590W and Longi Solar LR8-66HGD-620M? **Leapton LP182\*199-M-66-NB **590 W**** has a **30 years** power warranty; **Longi Solar LR8-66HGD-620M** 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 Leapton LP182\*199-M-66-NB 590W and Longi Solar LR8-66HGD-620M bifacial panels? Both **Leapton LP182\*199-M-66-NB **590 W**** and **Longi Solar LR8-66HGD-620M** 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 - [Leapton LP182\*199-M-66-NB 590W vs Leapton LP182\*199-M-66-NB 585W](https://comparepv.com/compare/leapton-lp182-199-m-66-nb-590w/leapton-lp182-199-m-66-nb-585w) - The same specification on paper - [Leapton LP182\*199-M-66-NB 590W vs Leapton LP182\*199-M-66-NB 580W](https://comparepv.com/compare/leapton-lp182-199-m-66-nb-590w/leapton-lp182-199-m-66-nb-580w) - 3 differences, the largest is module efficiency - [Leapton LP182\*199-M-66-NB 590W vs Leapton LP182\*199-M-66-NB 575W](https://comparepv.com/compare/leapton-lp182-199-m-66-nb-590w/leapton-lp182-199-m-66-nb-575w) - 3 differences, the largest is module efficiency - [Leapton LP182\*199-M-66-NB 590W vs Leapton LP182\*199-M-66-NB 570W](https://comparepv.com/compare/leapton-lp182-199-m-66-nb-590w/leapton-lp182-199-m-66-nb-570w) - 3 differences, the largest is module efficiency - [Longi Solar LR8-66HGD-620M vs Longi Solar LR8-66HGD-625M](https://comparepv.com/compare/longi-lr8-66hgd-620m/longi-lr8-66hgd-625m) - The same specification on paper - [Longi Solar LR8-66HGD-620M vs Longi Solar LR8-66HGD-615M](https://comparepv.com/compare/longi-lr8-66hgd-620m/longi-lr8-66hgd-615m) - One difference: module efficiency --- Source: https://comparepv.com/compare/leapton-lp182-199-m-66-nb-590w/longi-lr8-66hgd-620m 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.