--- title: "Luxen Solar Energy LNCU-635N vs Luxen Solar Energy LNCU-640N - Solar Panel Comparison | ComparePV" description: "Compare Luxen Solar Energy LNCU-635N vs Luxen Solar Energy LNCU-640N side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/luxen-solar-energy-lncu-635n/luxen-solar-energy-lncu-640n" image: "https://comparepv.com/og/compare/panels/luxen-solar-energy-lncu-635n/luxen-solar-energy-lncu-640n.png" updated: 2026-09-11 --- # Luxen Solar Energy LNCU-635N vs Luxen Solar Energy LNCU-640N Identical on every published parameter All 19 comparable parameters agree. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Luxen Solar Energy LNCU-635N](https://comparepv.com/panel/luxen-solar-energy-lncu-635n) | [Luxen Solar Energy LNCU-640N](https://comparepv.com/panel/luxen-solar-energy-lncu-640n) | | Manufacturer | Luxen Solar Energy | Luxen Solar Energy | | Power | 635 Wp | 640 Wp | | Efficiency | 22.72 % | 22.90 % | | Technology | N-type | N-type | ## Every compared parameter | Parameter | 635N | 640N | | --- | --- | --- | | Rated power | 635 Wp | 640 Wp | | Module efficiency | 22.72 % | 22.90 % | | Power density | 227.2 Wp/m² | 229.0 Wp/m² | | Open-circuit voltage | 52.54 V | 52.73 V | | Voltage at max power | 43.88 V | 44.05 V | | Short-circuit current | 15.34 A | 15.40 A | | Current at max power | 14.47 A | 14.53 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2465x1134x33 mm | 2465x1134x33 mm | | Module area | 2.795 m² | 2.795 m² | | Weight | 29.8 kg | 29.8 kg | | Weight per kWp | 46.9 kg/kWp | 46.6 kg/kWp | | Product warranty | 20 yrs | 20 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | N-type | N-type | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 144 | 144 | | 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 (-0.290 %/°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, 635N:** 21,306 kWh - **Cumulative output, 640N:** 21,473 kWh - **Gap:** 167 kWh ## Output when hot | Condition | Cell temperature | 635N | 640N | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 635 W | 640 W | 100.0% of rated power | | Cool, bright day | 40 °C | 607 W | 612 W | 95.7% of rated power | | Typical summer roof | 55 °C | 580 W | 584 W | 91.3% of rated power | | Hot roof | 70 °C | 552 W | 556 W | 87.0% of rated power | ## Against the whole database | Measure | 635N | 640N | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #3,302 | #2,412 | 14,129 | 640N leads by 890 places | | Power density | #3,309 | #2,443 | 14,129 | 640N leads by 866 places | | Heat behaviour | #2,220 | #2,220 | 14,129 | Tied - the same position in the database | | Weight | #1,405 | #1,230 | 14,129 | 640N leads by 175 places | | Warranty | #21 | #21 | 14,129 | Tied - the same position in the database | | Overall | #1,350 | #1,163 | 14,129 | 640N leads by 187 places | ## Questions ### Which panel is better: Luxen Solar Energy LNCU-635N or Luxen Solar Energy LNCU-640N? According to our database: **Luxen Solar Energy LNCU-640N** has higher module efficiency (**22.90%** vs **22.72%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Luxen Solar Energy LNCU-635N and Luxen Solar Energy LNCU-640N? **Luxen Solar Energy LNCU-635N** has a module efficiency of **22.72%**, while **Luxen Solar Energy LNCU-640N** is **22.90%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Luxen Solar Energy LNCU-635N use vs Luxen Solar Energy LNCU-640N? **Luxen Solar Energy LNCU-635N** uses **N-type** cells; **Luxen Solar Energy LNCU-640N** 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 Luxen Solar Energy LNCU-635N and Luxen Solar Energy LNCU-640N? **Luxen Solar Energy LNCU-635N** has a **30 years** power warranty; **Luxen Solar Energy LNCU-640N** 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 - [Luxen Solar Energy LNCU-635N vs Luxen Solar Energy LNCU-630N](https://comparepv.com/compare/luxen-solar-energy-lncu-635n/luxen-solar-energy-lncu-630n) - The same specification on paper - [Luxen Solar Energy LNCU-635N vs Luxen Solar Energy LNCU-625N](https://comparepv.com/compare/luxen-solar-energy-lncu-635n/luxen-solar-energy-lncu-625n) - 3 differences, the largest is module efficiency - [Luxen Solar Energy LNCU-635N vs Luxen Solar Energy LNCU-620N](https://comparepv.com/compare/luxen-solar-energy-lncu-635n/luxen-solar-energy-lncu-620n) - 3 differences, the largest is module efficiency - [Luxen Solar Energy LNCU-635N vs Luxen Solar Energy LNVU-590N](https://comparepv.com/compare/luxen-solar-energy-lncu-635n/luxen-solar-energy-lnvu-590n) - 6 differences, the largest is rated power - [Luxen Solar Energy LNCU-635N vs Luxen Solar Energy LNVU-585N](https://comparepv.com/compare/luxen-solar-energy-lncu-635n/luxen-solar-energy-lnvu-585n) - 6 differences, the largest is rated power - [Luxen Solar Energy LNCU-635N vs Luxen Solar Energy LNVU-580N](https://comparepv.com/compare/luxen-solar-energy-lncu-635n/luxen-solar-energy-lnvu-580n) - 7 differences, the largest is rated power --- Source: https://comparepv.com/compare/luxen-solar-energy-lncu-635n/luxen-solar-energy-lncu-640n 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.