--- title: "Navitas Solar NSM540-144 vs Navitas Solar NSM550-144 - Solar Panel Comparison | ComparePV" description: "Compare Navitas Solar NSM540-144 vs Navitas Solar NSM550-144 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/navitas-solar-nsm540-144/navitas-solar-nsm550-144" image: "https://comparepv.com/og/compare/panels/navitas-solar-nsm540-144/navitas-solar-nsm550-144.png" updated: 2026-09-11 --- # Navitas Solar NSM540-144 vs Navitas Solar NSM550-144 NSM550-144 leads on the differences that matter The largest is module efficiency: 0.39 pp more efficient. 15 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 | [Navitas Solar NSM540-144](https://comparepv.com/panel/navitas-solar-nsm540-144) | [Navitas Solar NSM550-144](https://comparepv.com/panel/navitas-solar-nsm550-144) | | Manufacturer | Navitas Solar | Navitas Solar | | Power | 540 Wp | 550 Wp | | Efficiency | 20.90 % | 21.29 % | | Technology | PERC | PERC | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | NSM540-144 | NSM550-144 | Difference | | --- | --- | --- | --- | | Module efficiency | 20.90 % | 21.29 % | +0.39 pp for NSM550-144 | | Power density | 209.0 Wp/m² | 212.9 Wp/m² | +3.9 Wp/m² for NSM550-144 | | Rated power | 540 Wp | 550 Wp | +10 W for NSM550-144 | ## Every compared parameter | Parameter | NSM540-144 | NSM550-144 | | --- | --- | --- | | Rated power | 540 Wp | 550 Wp | | Module efficiency | 20.90 % | 21.29 % | | Power density | 209.0 Wp/m² | 212.9 Wp/m² | | Open-circuit voltage | 50.16 V | 50.49 V | | Voltage at max power | 42.21 V | 42.68 V | | Short-circuit current | 13.60 A | 13.69 A | | Current at max power | 12.79 A | 12.88 A | | Temperature coefficient | -0.360 %/°C | -0.360 %/°C | | Dimensions | 2278x1134x35 mm | 2278x1134x35 mm | | Module area | 2.583 m² | 2.583 m² | | Weight | 29.0 kg | 29.0 kg | | Weight per kWp | 53.7 kg/kWp | 52.7 kg/kWp | | Product warranty | 10 yrs | 10 yrs | | Performance warranty | 25 yrs | 25 yrs | | Annual degradation | - | - | | Cell technology | PERC | PERC | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 144 | 144 | | Bifacial | No | No | ## Thirty-year yield A 1.0% first-year loss then 0.40% a year, assumed for both panels, at 1,200 kWh/kWp a year Same temp coeff. for both panels (-0.360 %/°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, NSM540-144:** 18,118 kWh - **Cumulative output, NSM550-144:** 18,454 kWh - **Gap:** 336 kWh ## Output when hot | Condition | Cell temperature | NSM540-144 | NSM550-144 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 540 W | 550 W | 100.0% of rated power | | Cool, bright day | 40 °C | 511 W | 520 W | 94.6% of rated power | | Typical summer roof | 55 °C | 482 W | 491 W | 89.2% of rated power | | Hot roof | 70 °C | 453 W | 461 W | 83.8% of rated power | ## Against the whole database | Measure | NSM540-144 | NSM550-144 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #10,148 | #8,776 | 14,129 | NSM550-144 leads by 1,372 places | | Power density | #10,176 | #8,563 | 14,129 | NSM550-144 leads by 1,613 places | | Heat behaviour | #12,425 | #12,425 | 14,129 | Tied - the same position in the database | | Weight | #7,781 | #6,427 | 14,129 | NSM550-144 leads by 1,354 places | | Warranty | #9,912 | #9,912 | 14,129 | Tied - the same position in the database | | Overall | #9,391 | #8,635 | 14,129 | NSM550-144 leads by 756 places | ## Questions ### Which panel is better: Navitas Solar NSM540-144 or Navitas Solar NSM550-144? According to our database: **Navitas Solar NSM550-144** has higher module efficiency (**21.29%** vs **20.90%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Navitas Solar NSM540-144 and Navitas Solar NSM550-144? **Navitas Solar NSM540-144** has a module efficiency of **20.90%**, while **Navitas Solar NSM550-144** is **21.29%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Navitas Solar NSM540-144 use vs Navitas Solar NSM550-144? **Navitas Solar NSM540-144** uses **PERC** cells; **Navitas Solar NSM550-144** 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 Navitas Solar NSM540-144 and Navitas Solar NSM550-144? **Navitas Solar NSM540-144** has a **25 years** power warranty; **Navitas Solar NSM550-144** 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 - [Navitas Solar NSM540-144 vs Navitas Solar NSM560-144](https://comparepv.com/compare/navitas-solar-nsm540-144/navitas-solar-nsm560-144) - 3 differences, the largest is module efficiency - [Navitas Solar NSM540-144 vs Navitas Solar NSM555-144](https://comparepv.com/compare/navitas-solar-nsm540-144/navitas-solar-nsm555-144) - 3 differences, the largest is module efficiency - [Navitas Solar NSM540-144 vs Navitas Solar NSM545-144](https://comparepv.com/compare/navitas-solar-nsm540-144/navitas-solar-nsm545-144) - The same specification on paper - [Navitas Solar NSM540-144 vs Navitas Solar NSM535-144](https://comparepv.com/compare/navitas-solar-nsm540-144/navitas-solar-nsm535-144) - The same specification on paper - [Navitas Solar NSM540-144 vs Navitas Solar NSM530-144](https://comparepv.com/compare/navitas-solar-nsm540-144/navitas-solar-nsm530-144) - 3 differences, the largest is module efficiency - [Navitas Solar NSM540-144 vs Navitas Solar NSM525-144](https://comparepv.com/compare/navitas-solar-nsm540-144/navitas-solar-nsm525-144) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/navitas-solar-nsm540-144/navitas-solar-nsm550-144 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.