--- title: "JA Solar JAM54D40-460/LR vs JA Solar JAM66D46-710/LB - Solar Panel Comparison | ComparePV" description: "Compare JA Solar JAM54D40-460/LR vs JA Solar JAM66D46-710/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-jam54d40-460-lr/ja-solar-jam66d46-710-lb" image: "https://comparepv.com/og/compare/panels/ja-solar-jam54d40-460-lr/ja-solar-jam66d46-710-lb.png" updated: 2026-09-11 --- # JA Solar JAM54D40-460/LR vs JA Solar JAM66D46-710/LB JAM54D40-460/LR leads on the differences that matter The largest is rated power: 250 W more power. 6 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [JA Solar JAM54D40-460/LR](https://comparepv.com/panel/ja-solar-jam54d40-460-lr) | [JA Solar JAM66D46-710/LB](https://comparepv.com/panel/ja-solar-jam66d46-710-lb) | | Manufacturer | JA Solar | JA Solar | | Power | 460 Wp | 710 Wp | | Efficiency | 23.00 % | 22.90 % | | Technology | N-type | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | JAM54D40-460/LR | JAM66D46-710/LB | Difference | | --- | --- | --- | --- | | Rated power | 460 Wp | 710 Wp | +250 W for JAM66D46-710/LB | | Weight | 22.0 kg | 38.2 kg | -16.2 kg for JAM54D40-460/LR | | Product warranty | 15 yrs | 12 yrs | +3 yrs for JAM54D40-460/LR | | Weight per kWp | 47.8 kg/kWp | 53.8 kg/kWp | -6.0 kg/kWp for JAM54D40-460/LR | | Open-circuit voltage | 39.70 V | 48.16 V | 8.46 V apart | | Short-circuit current | 14.64 A | 18.47 A | 3.83 A apart | | Module area | 1.998 m² | 3.106 m² | 1.108 m² apart | | Cell technology | N-type | TOPCon | N-type vs TOPCon | | Voltage at max power | 33.17 V | 40.40 V | 7.23 V apart | | Current at max power | 13.87 A | 17.32 A | 3.45 A apart | | Cell count | 108 | 132 | 24 cells apart | | Bifacial | No | Yes | No vs Yes | | Dimensions | 1762x1134x30 mm | 2384x1303x33 mm | 1762x1134x30 mm vs 2384x1303x33 mm | ## Every compared parameter | Parameter | JAM54D40-460/LR | JAM66D46-710/LB | | --- | --- | --- | | Rated power | 460 Wp | 710 Wp | | Module efficiency | 23.00 % | 22.90 % | | Power density | 230.2 Wp/m² | 228.6 Wp/m² | | Open-circuit voltage | 39.70 V | 48.16 V | | Voltage at max power | 33.17 V | 40.40 V | | Short-circuit current | 14.64 A | 18.47 A | | Current at max power | 13.87 A | 17.32 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 1762x1134x30 mm | 2384x1303x33 mm | | Module area | 1.998 m² | 3.106 m² | | Weight | 22.0 kg | 38.2 kg | | Weight per kWp | 47.8 kg/kWp | 53.8 kg/kWp | | Product warranty | 15 yrs | 12 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 | 132 | | Bifacial | No | 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, JAM54D40-460/LR:** 15,434 kWh - **Cumulative output, JAM66D46-710/LB:** 23,822 kWh - **Gap:** 8,388 kWh ## Output when hot | Condition | Cell temperature | JAM54D40-460/LR | JAM66D46-710/LB | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 460 W | 710 W | 100.0% of rated power | | Cool, bright day | 40 °C | 440 W | 679 W | 95.7% of rated power | | Typical summer roof | 55 °C | 420 W | 648 W | 91.3% of rated power | | Hot roof | 70 °C | 400 W | 617 W | 87.0% of rated power | ## Against the whole database | Measure | JAM54D40-460/LR | JAM66D46-710/LB | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,970 | #2,412 | 14,129 | JAM54D40-460/LR leads by 442 places | | Power density | #1,927 | #2,529 | 14,129 | JAM54D40-460/LR leads by 602 places | | Heat behaviour | #2,220 | #2,220 | 14,129 | Tied - the same position in the database | | Weight | #1,925 | #7,959 | 14,129 | JAM54D40-460/LR leads by 6,034 places | | Warranty | #21 | #21 | 14,129 | Tied - the same position in the database | | Overall | #7,408 | #830 | 14,129 | JAM66D46-710/LB leads by 6,578 places | ## Questions ### Which panel is better: JA Solar JAM54D40-460/LR or JA Solar JAM66D46-710/LB? According to our database: **JA Solar JAM54D40-460/LR** has higher module efficiency (**23.00%** vs **22.90%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of JA Solar JAM54D40-460/LR and JA Solar JAM66D46-710/LB? **JA Solar JAM54D40-460/LR** has a module efficiency of **23.00%**, while **JA Solar JAM66D46-710/LB** is **22.90%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does JA Solar JAM54D40-460/LR use vs JA Solar JAM66D46-710/LB? **JA Solar JAM54D40-460/LR** uses **N-type** cells; **JA Solar JAM66D46-710/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 JAM54D40-460/LR and JA Solar JAM66D46-710/LB? **JA Solar JAM54D40-460/LR** has a **30 years** power warranty; **JA Solar JAM66D46-710/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 JAM54D40-460/LR and JA Solar JAM66D46-710/LB bifacial panels? **JA Solar JAM66D46-710/LB** is bifacial (captures light from both faces); **JA Solar JAM54D40-460/LR** is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath. ## Related comparisons - [JA Solar JAM54D40-460/LR vs JA Solar JAM54D40-475/LR](https://comparepv.com/compare/ja-solar-jam54d40-460-lr/ja-solar-jam54d40-475-lr) - 4 differences, the largest is module efficiency - [JA Solar JAM54D40-460/LR vs JA Solar JAM54D40-470/LR](https://comparepv.com/compare/ja-solar-jam54d40-460-lr/ja-solar-jam54d40-470-lr) - 3 differences, the largest is module efficiency - [JA Solar JAM54D40-460/LR vs JA Solar JAM54D40-465/LR](https://comparepv.com/compare/ja-solar-jam54d40-460-lr/ja-solar-jam54d40-465-lr) - One difference: module efficiency - [JA Solar JAM54D40-460/LR vs JA Solar JAM54S40-460/LR](https://comparepv.com/compare/ja-solar-jam54d40-460-lr/ja-solar-jam54s40-460-lr) - 3 differences, the largest is weight per kwp - [JA Solar JAM54D40-460/LR vs JA Solar JAM54S40-455/LR](https://comparepv.com/compare/ja-solar-jam54d40-460-lr/ja-solar-jam54s40-455-lr) - 4 differences, the largest is weight - [JA Solar JAM54D40-460/LR vs JA Solar JAM54D41-455/LR](https://comparepv.com/compare/ja-solar-jam54d40-460-lr/ja-solar-jam54d41-455-lr) - 2 differences, the largest is cell technology --- Source: https://comparepv.com/compare/ja-solar-jam54d40-460-lr/ja-solar-jam66d46-710-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.