--- title: "JA Solar JAM60D42-520/LB vs JA Solar JAM60D42-545/LB - Solar Panel Comparison | ComparePV" description: "Compare JA Solar JAM60D42-520/LB vs JA Solar JAM60D42-545/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-jam60d42-520-lb-1/ja-solar-jam60d42-545-lb" updated: 2026-09-11 --- # JA Solar JAM60D42-520/LB vs JA Solar JAM60D42-545/LB 545/LB leads on the differences that matter The largest is module efficiency: 1.10 pp more efficient. 13 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [JA Solar JAM60D42-520/LB](https://comparepv.com/panel/ja-solar-jam60d42-520-lb-1) | [JA Solar JAM60D42-545/LB](https://comparepv.com/panel/ja-solar-jam60d42-545-lb) | | Manufacturer | JA Solar | JA Solar | | Power | 520 Wp | 545 Wp | | Efficiency | 22.20 % | 23.30 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 520/LB | 545/LB | Difference | | --- | --- | --- | --- | | Module efficiency | 22.20 % | 23.30 % | +1.10 pp for 545/LB | | Power density | 222.3 Wp/m² | 233.0 Wp/m² | +10.7 Wp/m² for 545/LB | | Rated power | 520 Wp | 545 Wp | +25 W for 545/LB | | Weight per kWp | 55.4 kg/kWp | 52.8 kg/kWp | -2.5 kg/kWp for 545/LB | | Open-circuit voltage | 43.53 V | 44.53 V | 1.00 V apart | | Voltage at max power | 36.37 V | 37.46 V | 1.09 V apart | ## Every compared parameter | Parameter | 520/LB | 545/LB | | --- | --- | --- | | Rated power | 520 Wp | 545 Wp | | Module efficiency | 22.20 % | 23.30 % | | Power density | 222.3 Wp/m² | 233.0 Wp/m² | | Open-circuit voltage | 43.53 V | 44.53 V | | Voltage at max power | 36.37 V | 37.46 V | | Short-circuit current | 15.16 A | 15.41 A | | Current at max power | 14.30 A | 14.55 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2063x1134x30 mm | 2063x1134x30 mm | | Module area | 2.339 m² | 2.339 m² | | Weight | 28.8 kg | 28.8 kg | | Weight per kWp | 55.4 kg/kWp | 52.8 kg/kWp | | Product warranty | 12 yrs | 12 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 | 120 | 120 | | 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, 520/LB:** 17,447 kWh - **Cumulative output, 545/LB:** 18,286 kWh - **Gap:** 839 kWh ## Output when hot | Condition | Cell temperature | 520/LB | 545/LB | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 520 W | 545 W | 100.0% of rated power | | Cool, bright day | 40 °C | 497 W | 521 W | 95.7% of rated power | | Typical summer roof | 55 °C | 475 W | 498 W | 91.3% of rated power | | Hot roof | 70 °C | 452 W | 474 W | 87.0% of rated power | ## Against the whole database | Measure | 520/LB | 545/LB | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #5,817 | #1,017 | 14,005 | 545/LB leads by 4,800 places | | Power density | #5,730 | #1,112 | 14,005 | 545/LB leads by 4,618 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #9,816 | #6,543 | 14,005 | 545/LB leads by 3,273 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #6,938 | #4,743 | 14,005 | 545/LB leads by 2,195 places | ## Questions ### Which panel is better: JA Solar JAM60D42-520/LB or JA Solar JAM60D42-545/LB? According to our database: **JA Solar JAM60D42-545/LB** has higher module efficiency (**23.30%** vs **22.20%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of JA Solar JAM60D42-520/LB and JA Solar JAM60D42-545/LB? **JA Solar JAM60D42-520/LB** has a module efficiency of **22.20%**, while **JA Solar JAM60D42-545/LB** is **23.30%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does JA Solar JAM60D42-520/LB use vs JA Solar JAM60D42-545/LB? **JA Solar JAM60D42-520/LB** uses **TOPCon** cells; **JA Solar JAM60D42-545/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 JAM60D42-520/LB and JA Solar JAM60D42-545/LB? **JA Solar JAM60D42-520/LB** has a **30 years** power warranty; **JA Solar JAM60D42-545/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 JAM60D42-520/LB and JA Solar JAM60D42-545/LB bifacial panels? Both **JA Solar JAM60D42-520/LB** and **JA Solar JAM60D42-545/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 JAM60D42-520/LB vs JA Solar JAM60D42-540/LB](https://comparepv.com/compare/ja-solar-jam60d42-520-lb-1/ja-solar-jam60d42-540-lb-1) - 4 differences, the largest is module efficiency - [JA Solar JAM60D42-520/LB vs JA Solar JAM60D42-535/LB](https://comparepv.com/compare/ja-solar-jam60d42-520-lb-1/ja-solar-jam60d42-535-lb) - 3 differences, the largest is module efficiency - [JA Solar JAM60D42-520/LB vs JA Solar JAM60D42-530/LB](https://comparepv.com/compare/ja-solar-jam60d42-520-lb-1/ja-solar-jam60d42-530-lb-1) - 3 differences, the largest is module efficiency - [JA Solar JAM60D42-520/LB vs JA Solar JAM60D42-525/LB](https://comparepv.com/compare/ja-solar-jam60d42-520-lb-1/ja-solar-jam60d42-525-lb) - One difference: module efficiency - [JA Solar JAM60D42-520/LB vs JA Solar JAM60D41 510/LB](https://comparepv.com/compare/ja-solar-jam60d42-520-lb-1/ja-solar-jam60d41-510-lb) - 8 differences, the largest is module efficiency - [JA Solar JAM60D42-520/LB vs JA Solar JAM60D41-510/LB](https://comparepv.com/compare/ja-solar-jam60d42-520-lb-1/ja-solar-jam60d41-510-lb-1) - 8 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/ja-solar-jam60d42-520-lb-1/ja-solar-jam60d42-545-lb 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.