--- title: "JA Solar JAM54D40-475/LB vs JA Solar JAM54D41-455/LB - Solar Panel Comparison | ComparePV" description: "Compare JA Solar JAM54D40-475/LB vs JA Solar JAM54D41-455/LB 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-jam54d40-475-lb/ja-solar-jam54d41-455-lb-1" updated: 2026-09-11 --- # JA Solar JAM54D40-475/LB vs JA Solar JAM54D41-455/LB JAM54D40-475/LB leads on the differences that matter The largest is module efficiency: 1.00 pp more efficient. 13 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [JA Solar JAM54D40-475/LB](https://comparepv.com/panel/ja-solar-jam54d40-475-lb) | [JA Solar JAM54D41-455/LB](https://comparepv.com/panel/ja-solar-jam54d41-455-lb-1) | | Manufacturer | JA Solar | JA Solar | | Power | 475 Wp | 455 Wp | | Efficiency | 23.80 % | 22.80 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | JAM54D40-475/LB | JAM54D41-455/LB | Difference | | --- | --- | --- | --- | | Module efficiency | 23.80 % | 22.80 % | +1.00 pp for JAM54D40-475/LB | | Power density | 237.7 Wp/m² | 227.7 Wp/m² | +10.0 Wp/m² for JAM54D40-475/LB | | Rated power | 475 Wp | 455 Wp | +20 W for JAM54D40-475/LB | | Short-circuit current | 16.19 A | 14.95 A | 1.24 A apart | | Weight per kWp | 46.3 kg/kWp | 48.4 kg/kWp | -2.0 kg/kWp for JAM54D40-475/LB | | Open-circuit voltage | 40.55 V | 39.50 V | 1.05 V apart | ## Every compared parameter | Parameter | JAM54D40-475/LB | JAM54D41-455/LB | | --- | --- | --- | | Rated power | 475 Wp | 455 Wp | | Module efficiency | 23.80 % | 22.80 % | | Power density | 237.7 Wp/m² | 227.7 Wp/m² | | Open-circuit voltage | 40.55 V | 39.50 V | | Voltage at max power | 33.68 V | 32.83 V | | Short-circuit current | 16.19 A | 14.95 A | | Current at max power | 14.11 A | 13.99 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 1762x1134x30 mm | 1762x1134x30 mm | | Module area | 1.998 m² | 1.998 m² | | Weight | 22.0 kg | 22.0 kg | | Weight per kWp | 46.3 kg/kWp | 48.4 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 108 | 108 | | Bifacial | Yes | Yes | ## 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, JAM54D40-475/LB:** 15,937 kWh - **Cumulative output, JAM54D41-455/LB:** 15,266 kWh - **Gap:** 671 kWh ## Output when hot | Condition | Cell temperature | JAM54D40-475/LB | JAM54D41-455/LB | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 475 W | 455 W | 100.0% of rated power | | Cool, bright day | 40 °C | 454 W | 435 W | 95.7% of rated power | | Typical summer roof | 55 °C | 434 W | 415 W | 91.3% of rated power | | Hot roof | 70 °C | 413 W | 396 W | 87.0% of rated power | ## Against the whole database | Measure | JAM54D40-475/LB | JAM54D41-455/LB | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #433 | #2,714 | 14,005 | JAM54D40-475/LB leads by 2,281 places | | Power density | #467 | #2,888 | 14,005 | JAM54D40-475/LB leads by 2,421 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #1,117 | #2,220 | 14,005 | JAM54D40-475/LB leads by 1,103 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #5,786 | #7,813 | 14,005 | JAM54D40-475/LB leads by 2,027 places | ## Questions ### Which panel is better: JA Solar JAM54D40-475/LB or JA Solar JAM54D41-455/LB? According to our database: **JA Solar JAM54D40-475/LB** has higher module efficiency (**23.80%** vs **22.80%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of JA Solar JAM54D40-475/LB and JA Solar JAM54D41-455/LB? **JA Solar JAM54D40-475/LB** has a module efficiency of **23.80%**, while **JA Solar JAM54D41-455/LB** is **22.80%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does JA Solar JAM54D40-475/LB use vs JA Solar JAM54D41-455/LB? **JA Solar JAM54D40-475/LB** uses **TOPCon** cells; **JA Solar JAM54D41-455/LB** 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 JAM54D40-475/LB and JA Solar JAM54D41-455/LB? **JA Solar JAM54D40-475/LB** has a **30 years** power warranty; **JA Solar JAM54D41-455/LB** 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 JA Solar JAM54D40-475/LB and JA Solar JAM54D41-455/LB bifacial panels? Both **JA Solar JAM54D40-475/LB** and **JA Solar JAM54D41-455/LB** 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 - [JA Solar JAM54D40-475/LB vs JA Solar JAM54D40-470/LB](https://comparepv.com/compare/ja-solar-jam54d40-475-lb/ja-solar-jam54d40-470-lb) - 2 differences, the largest is module efficiency - [JA Solar JAM54D40-475/LB vs JA Solar JAM54D40-465/LB](https://comparepv.com/compare/ja-solar-jam54d40-475-lb/ja-solar-jam54d40-465-lb) - 4 differences, the largest is module efficiency - [JA Solar JAM54D40-475/LB vs JA Solar JAM54D40-460/LB](https://comparepv.com/compare/ja-solar-jam54d40-475-lb/ja-solar-jam54d40-460-lb-1) - 5 differences, the largest is module efficiency - [JA Solar JAM54D40-475/LB vs JA Solar JAM54D40-455/LB](https://comparepv.com/compare/ja-solar-jam54d40-475-lb/ja-solar-jam54d40-455-lb-1) - 7 differences, the largest is module efficiency - [JA Solar JAM54D40-475/LB vs JA Solar JAM54D41 455/LB](https://comparepv.com/compare/ja-solar-jam54d40-475-lb/ja-solar-jam54d41-455-lb) - 8 differences, the largest is module efficiency - [JA Solar JAM54D40-475/LB vs JA Solar JAM54D40-450/LB](https://comparepv.com/compare/ja-solar-jam54d40-475-lb/ja-solar-jam54d40-450-lb-1) - 7 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/ja-solar-jam54d40-475-lb/ja-solar-jam54d41-455-lb-1 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.