--- title: "JA Solar JAT54S40-485/LR vs JA Solar JAT54S41-475/LR - Solar Panel Comparison | ComparePV" description: "Compare JA Solar JAT54S40-485/LR vs JA Solar JAT54S41-475/LR side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/ja-solar-jat54s40-485-lr/ja-solar-jat54s41-475-lr" updated: 2026-09-11 --- # JA Solar JAT54S40-485/LR vs JA Solar JAT54S41-475/LR 5 differences, and they point both ways The largest is module efficiency: 0.50 pp more efficient. 14 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [JA Solar JAT54S40-485/LR](https://comparepv.com/panel/ja-solar-jat54s40-485-lr) | [JA Solar JAT54S41-475/LR](https://comparepv.com/panel/ja-solar-jat54s41-475-lr) | | Manufacturer | JA Solar | JA Solar | | Power | 485 Wp | 475 Wp | | Efficiency | 24.30 % | 23.80 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | JAT54S40-485/LR | JAT54S41-475/LR | Difference | | --- | --- | --- | --- | | Module efficiency | 24.30 % | 23.80 % | +0.50 pp for JAT54S40-485/LR | | Annual degradation | 0.55 %/yr | 0.40 %/yr | -0.15 %/yr for JAT54S41-475/LR | | Product warranty | 15 yrs | 25 yrs | +10 yrs for JAT54S41-475/LR | | Power density | 242.7 Wp/m² | 237.7 Wp/m² | +5.0 Wp/m² for JAT54S40-485/LR | | Rated power | 485 Wp | 475 Wp | +10 W for JAT54S40-485/LR | ## Every compared parameter | Parameter | JAT54S40-485/LR | JAT54S41-475/LR | | --- | --- | --- | | Rated power | 485 Wp | 475 Wp | | Module efficiency | 24.30 % | 23.80 % | | Power density | 242.7 Wp/m² | 237.7 Wp/m² | | Open-circuit voltage | 41.17 V | 41.03 V | | Voltage at max power | 35.13 V | 34.87 V | | Short-circuit current | 15.02 A | 14.90 A | | Current at max power | 13.81 A | 13.63 A | | Temperature coefficient | -0.260 %/°C | -0.260 %/°C | | Dimensions | 1762x1134x30 mm | 1762x1134x30 mm | | Module area | 1.998 m² | 1.998 m² | | Weight | 19.3 kg | 19.3 kg | | Weight per kWp | 39.8 kg/kWp | 40.6 kg/kWp | | Product warranty | 15 yrs | 25 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.55 %/yr | 0.40 %/yr | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 108 | 108 | | 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, JAT54S40-485/LR:** 15,893 kWh - **Cumulative output, JAT54S41-475/LR:** 15,937 kWh - **Gap:** 44 kWh ## Output when hot | Condition | Cell temperature | JAT54S40-485/LR | JAT54S41-475/LR | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 485 W | 475 W | 100.0% of rated power | | Cool, bright day | 40 °C | 466 W | 456 W | 96.1% of rated power | | Typical summer roof | 55 °C | 447 W | 438 W | 92.2% of rated power | | Hot roof | 70 °C | 428 W | 419 W | 88.3% of rated power | ## Against the whole database | Measure | JAT54S40-485/LR | JAT54S41-475/LR | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #131 | #433 | 14,005 | JAT54S40-485/LR leads by 302 places | | Power density | #140 | #467 | 14,005 | JAT54S40-485/LR leads by 327 places | | Heat behaviour | #511 | #511 | 14,005 | Tied - the same position in the database | | Weight | #158 | #165 | 14,005 | JAT54S40-485/LR leads by 7 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #4,770 | #3,637 | 14,005 | JAT54S41-475/LR leads by 1,133 places | ## Questions ### Which panel is better: JA Solar JAT54S40-485/LR or JA Solar JAT54S41-475/LR? According to our database: **JA Solar JAT54S40-485/LR** has higher module efficiency (**24.30%** vs **23.80%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of JA Solar JAT54S40-485/LR and JA Solar JAT54S41-475/LR? **JA Solar JAT54S40-485/LR** has a module efficiency of **24.30%**, while **JA Solar JAT54S41-475/LR** is **23.80%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does JA Solar JAT54S40-485/LR use vs JA Solar JAT54S41-475/LR? **JA Solar JAT54S40-485/LR** uses **TOPCon** cells; **JA Solar JAT54S41-475/LR** uses **TOPCon**. 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 JA Solar JAT54S40-485/LR and JA Solar JAT54S41-475/LR? **JA Solar JAT54S40-485/LR** has a **30 years** power warranty; **JA Solar JAT54S41-475/LR** 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 - [JA Solar JAT54S40-485/LR vs JA Solar JAT54S40-480/LR](https://comparepv.com/compare/ja-solar-jat54s40-485-lr/ja-solar-jat54s40-480-lr) - One difference: module efficiency - [JA Solar JAT54S40-485/LR vs JA Solar JAT54S41-480/LR](https://comparepv.com/compare/ja-solar-jat54s40-485-lr/ja-solar-jat54s41-480-lr) - 3 differences, the largest is annual degradation - [JA Solar JAT54S40-485/LR vs JA Solar JAT54S40-475/LR](https://comparepv.com/compare/ja-solar-jat54s40-485-lr/ja-solar-jat54s40-475-lr) - 3 differences, the largest is module efficiency - [JA Solar JAT54S40-485/LR vs JA Solar JAT54S40-470/LR](https://comparepv.com/compare/ja-solar-jat54s40-485-lr/ja-solar-jat54s40-470-lr) - 3 differences, the largest is module efficiency - [JA Solar JAT54S40-485/LR vs JA Solar JAT54S41-470/LR](https://comparepv.com/compare/ja-solar-jat54s40-485-lr/ja-solar-jat54s41-470-lr) - 5 differences, the largest is module efficiency - [JA Solar JAT54S40-485/LR vs JA Solar JAT54S40-465/LR](https://comparepv.com/compare/ja-solar-jat54s40-485-lr/ja-solar-jat54s40-465-lr) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/ja-solar-jat54s40-485-lr/ja-solar-jat54s41-475-lr 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.