--- title: "JA Solar JAM54D40-450/LR vs JA Solar JAM54D41-455/LR - Solar Panel Comparison | ComparePV" description: "Compare JA Solar JAM54D40-450/LR vs JA Solar JAM54D41-455/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-jam54d40-450-lr/ja-solar-jam54d41-455-lr" updated: 2026-09-11 --- # JA Solar JAM54D40-450/LR vs JA Solar JAM54D41-455/LR JAM54D41-455/LR leads on the differences that matter The largest is module efficiency: 0.30 pp more efficient. 16 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [JA Solar JAM54D40-450/LR](https://comparepv.com/panel/ja-solar-jam54d40-450-lr) | [JA Solar JAM54D41-455/LR](https://comparepv.com/panel/ja-solar-jam54d41-455-lr) | | Manufacturer | JA Solar | JA Solar | | Power | 450 Wp | 455 Wp | | Efficiency | 22.50 % | 22.80 % | | Technology | N-type | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | JAM54D40-450/LR | JAM54D41-455/LR | Difference | | --- | --- | --- | --- | | Module efficiency | 22.50 % | 22.80 % | +0.30 pp for JAM54D41-455/LR | | Cell technology | N-type | TOPCon | N-type vs TOPCon | | Open-circuit voltage | 39.30 V | 40.50 V | 1.20 V apart | ## Every compared parameter | Parameter | JAM54D40-450/LR | JAM54D41-455/LR | | --- | --- | --- | | Rated power | 450 Wp | 455 Wp | | Module efficiency | 22.50 % | 22.80 % | | Power density | 225.2 Wp/m² | 227.7 Wp/m² | | Open-circuit voltage | 39.30 V | 40.50 V | | Voltage at max power | 32.82 V | 33.33 V | | Short-circuit current | 14.48 A | 14.42 A | | Current at max power | 13.71 A | 13.65 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 | 48.9 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 | N-type | 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 (-0.290 %/°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, JAM54D40-450/LR:** 15,098 kWh - **Cumulative output, JAM54D41-455/LR:** 15,266 kWh - **Gap:** 168 kWh ## Output when hot | Condition | Cell temperature | JAM54D40-450/LR | JAM54D41-455/LR | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 450 W | 455 W | 100.0% of rated power | | Cool, bright day | 40 °C | 430 W | 435 W | 95.7% of rated power | | Typical summer roof | 55 °C | 411 W | 415 W | 91.3% of rated power | | Hot roof | 70 °C | 391 W | 396 W | 87.0% of rated power | ## Against the whole database | Measure | JAM54D40-450/LR | JAM54D41-455/LR | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #4,222 | #2,714 | 14,005 | JAM54D41-455/LR leads by 1,508 places | | Power density | #4,225 | #2,888 | 14,005 | JAM54D41-455/LR leads by 1,337 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #2,563 | #2,220 | 14,005 | JAM54D41-455/LR leads by 343 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #8,397 | #7,813 | 14,005 | JAM54D41-455/LR leads by 584 places | ## Questions ### Which panel is better: JA Solar JAM54D40-450/LR or JA Solar JAM54D41-455/LR? According to our database: **JA Solar JAM54D41-455/LR** has higher module efficiency (**22.80%** vs **22.50%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of JA Solar JAM54D40-450/LR and JA Solar JAM54D41-455/LR? **JA Solar JAM54D40-450/LR** has a module efficiency of **22.50%**, while **JA Solar JAM54D41-455/LR** is **22.80%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does JA Solar JAM54D40-450/LR use vs JA Solar JAM54D41-455/LR? **JA Solar JAM54D40-450/LR** uses **N-type** cells; **JA Solar JAM54D41-455/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 JAM54D40-450/LR and JA Solar JAM54D41-455/LR? **JA Solar JAM54D40-450/LR** has a **30 years** power warranty; **JA Solar JAM54D41-455/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 JAM54D40-450/LR vs JA Solar JAM54D40-475/LR](https://comparepv.com/compare/ja-solar-jam54d40-450-lr/ja-solar-jam54d40-475-lr) - 6 differences, the largest is module efficiency - [JA Solar JAM54D40-450/LR vs JA Solar JAM54D40-470/LR](https://comparepv.com/compare/ja-solar-jam54d40-450-lr/ja-solar-jam54d40-470-lr) - 6 differences, the largest is module efficiency - [JA Solar JAM54D40-450/LR vs JA Solar JAM54D40-465/LR](https://comparepv.com/compare/ja-solar-jam54d40-450-lr/ja-solar-jam54d40-465-lr) - 3 differences, the largest is module efficiency - [JA Solar JAM54D40-450/LR vs JA Solar JAM54S40-460/LR](https://comparepv.com/compare/ja-solar-jam54d40-450-lr/ja-solar-jam54s40-460-lr) - 6 differences, the largest is module efficiency - [JA Solar JAM54D40-450/LR vs JA Solar JAM54D40-460/LR](https://comparepv.com/compare/ja-solar-jam54d40-450-lr/ja-solar-jam54d40-460-lr) - 3 differences, the largest is module efficiency - [JA Solar JAM54D40-450/LR vs JA Solar JAM54S40-455/LR](https://comparepv.com/compare/ja-solar-jam54d40-450-lr/ja-solar-jam54s40-455-lr) - 4 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/ja-solar-jam54d40-450-lr/ja-solar-jam54d41-455-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.