--- title: "JA Solar JAM60D41-510/LB vs JA Solar JAM66D45-615/LB - Solar Panel Comparison | ComparePV" description: "Compare JA Solar JAM60D41-510/LB vs JA Solar JAM66D45-615/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-jam60d41-510-lb-1/ja-solar-jam66d45-615-lb" updated: 2026-09-11 --- # JA Solar JAM60D41-510/LB vs JA Solar JAM66D45-615/LB 10 differences, and they point both ways The largest is rated power: 105 W more power. 9 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [JA Solar JAM60D41-510/LB](https://comparepv.com/panel/ja-solar-jam60d41-510-lb-1) | [JA Solar JAM66D45-615/LB](https://comparepv.com/panel/ja-solar-jam66d45-615-lb) | | Manufacturer | JA Solar | JA Solar | | Power | 510 Wp | 615 Wp | | Efficiency | 23.00 % | 22.80 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | JAM60D41-510/LB | JAM66D45-615/LB | Difference | | --- | --- | --- | --- | | Rated power | 510 Wp | 615 Wp | +105 W for JAM66D45-615/LB | | Weight | 27.3 kg | 33.1 kg | -5.8 kg for JAM60D41-510/LB | | Open-circuit voltage | 44.25 V | 48.30 V | 4.05 V apart | | Module area | 2.215 m² | 2.701 m² | 0.486 m² apart | | Short-circuit current | 14.54 A | 16.10 A | 1.56 A apart | | Module efficiency | 23.00 % | 22.80 % | +0.20 pp for JAM60D41-510/LB | | Cell count | 120 | 132 | 12 cells apart | | Current at max power | 13.67 A | 15.39 A | 1.72 A apart | | Voltage at max power | 37.31 V | 39.96 V | 2.65 V apart | | Dimensions | 1953x1134x30 mm | 2382x1134x30 mm | 1953x1134x30 mm vs 2382x1134x30 mm | ## Every compared parameter | Parameter | JAM60D41-510/LB | JAM66D45-615/LB | | --- | --- | --- | | Rated power | 510 Wp | 615 Wp | | Module efficiency | 23.00 % | 22.80 % | | Power density | 230.3 Wp/m² | 227.7 Wp/m² | | Open-circuit voltage | 44.25 V | 48.30 V | | Voltage at max power | 37.31 V | 39.96 V | | Short-circuit current | 14.54 A | 16.10 A | | Current at max power | 13.67 A | 15.39 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 1953x1134x30 mm | 2382x1134x30 mm | | Module area | 2.215 m² | 2.701 m² | | Weight | 27.3 kg | 33.1 kg | | Weight per kWp | 53.5 kg/kWp | 53.8 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 | 132 | | 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, JAM60D41-510/LB:** 17,112 kWh - **Cumulative output, JAM66D45-615/LB:** 20,634 kWh - **Gap:** 3,522 kWh ## Output when hot | Condition | Cell temperature | JAM60D41-510/LB | JAM66D45-615/LB | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 510 W | 615 W | 100.0% of rated power | | Cool, bright day | 40 °C | 488 W | 588 W | 95.7% of rated power | | Typical summer roof | 55 °C | 466 W | 561 W | 91.3% of rated power | | Hot roof | 70 °C | 443 W | 535 W | 87.0% of rated power | ## Against the whole database | Measure | JAM60D41-510/LB | JAM66D45-615/LB | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,919 | #2,714 | 14,005 | JAM60D41-510/LB leads by 795 places | | Power density | #1,849 | #3,077 | 14,005 | JAM60D41-510/LB leads by 1,228 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #7,509 | #7,888 | 14,005 | JAM60D41-510/LB leads by 379 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #6,280 | #2,894 | 14,005 | JAM66D45-615/LB leads by 3,386 places | ## Questions ### Which panel is better: JA Solar JAM60D41-510/LB or JA Solar JAM66D45-615/LB? According to our database: **JA Solar JAM60D41-510/LB** has higher module efficiency (**23.00%** 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 JAM60D41-510/LB and JA Solar JAM66D45-615/LB? **JA Solar JAM60D41-510/LB** has a module efficiency of **23.00%**, while **JA Solar JAM66D45-615/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 JAM60D41-510/LB use vs JA Solar JAM66D45-615/LB? **JA Solar JAM60D41-510/LB** uses **TOPCon** cells; **JA Solar JAM66D45-615/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 JAM60D41-510/LB and JA Solar JAM66D45-615/LB? **JA Solar JAM60D41-510/LB** has a **30 years** power warranty; **JA Solar JAM66D45-615/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 JAM60D41-510/LB and JA Solar JAM66D45-615/LB bifacial panels? Both **JA Solar JAM60D41-510/LB** and **JA Solar JAM66D45-615/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 JAM60D41-510/LB vs JA Solar JAM66D45-630/LB](https://comparepv.com/compare/ja-solar-jam60d41-510-lb-1/ja-solar-jam66d45-630-lb) - 10 differences, the largest is rated power - [JA Solar JAM60D41-510/LB vs JA Solar JAM66D45-625/LB](https://comparepv.com/compare/ja-solar-jam60d41-510-lb-1/ja-solar-jam66d45-625-lb) - 9 differences, the largest is rated power - [JA Solar JAM60D41-510/LB vs JA Solar JAM66D45-620/LB](https://comparepv.com/compare/ja-solar-jam60d41-510-lb-1/ja-solar-jam66d45-620-lb) - 9 differences, the largest is rated power - [JA Solar JAM60D41-510/LB vs JA Solar JAM66D45-610/LB](https://comparepv.com/compare/ja-solar-jam60d41-510-lb-1/ja-solar-jam66d45-610-lb) - 11 differences, the largest is rated power - [JA Solar JAM60D41-510/LB vs JA Solar JAM66D45-605/LB](https://comparepv.com/compare/ja-solar-jam60d41-510-lb-1/ja-solar-jam66d45-605-lb) - 11 differences, the largest is rated power - [JA Solar JAM60D41-510/LB vs JA Solar JAM60D41-505/LB](https://comparepv.com/compare/ja-solar-jam60d41-510-lb-1/ja-solar-jam60d41-505-lb-1) - One difference: module efficiency --- Source: https://comparepv.com/compare/ja-solar-jam60d41-510-lb-1/ja-solar-jam66d45-615-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.