--- title: "JA Solar JAM54D40-460/LB vs JA Solar JAM54D40-470/LB - Solar Panel Comparison | ComparePV" description: "Compare JA Solar JAM54D40-460/LB vs JA Solar JAM54D40-470/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-lb-1/ja-solar-jam54d40-470-lb" updated: 2026-09-11 --- # JA Solar JAM54D40-460/LB vs JA Solar JAM54D40-470/LB 470/LB leads on the differences that matter The largest is module efficiency: 0.50 pp more efficient. 14 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [JA Solar JAM54D40-460/LB](https://comparepv.com/panel/ja-solar-jam54d40-460-lb-1) | [JA Solar JAM54D40-470/LB](https://comparepv.com/panel/ja-solar-jam54d40-470-lb) | | Manufacturer | JA Solar | JA Solar | | Power | 460 Wp | 470 Wp | | Efficiency | 23.00 % | 23.50 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 460/LB | 470/LB | Difference | | --- | --- | --- | --- | | Module efficiency | 23.00 % | 23.50 % | +0.50 pp for 470/LB | | Product warranty | 12 yrs | 15 yrs | +3 yrs for 470/LB | | Power density | 230.2 Wp/m² | 235.2 Wp/m² | +5.0 Wp/m² for 470/LB | | Rated power | 460 Wp | 470 Wp | +10 W for 470/LB | | Short-circuit current | 14.64 A | 15.16 A | 0.52 A apart | ## Every compared parameter | Parameter | 460/LB | 470/LB | | --- | --- | --- | | Rated power | 460 Wp | 470 Wp | | Module efficiency | 23.00 % | 23.50 % | | Power density | 230.2 Wp/m² | 235.2 Wp/m² | | Open-circuit voltage | 39.70 V | 40.00 V | | Voltage at max power | 33.17 V | 33.50 V | | Short-circuit current | 14.64 A | 15.16 A | | Current at max power | 13.87 A | 14.03 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 | 47.8 kg/kWp | 46.8 kg/kWp | | Product warranty | 12 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, 460/LB:** 15,434 kWh - **Cumulative output, 470/LB:** 15,769 kWh - **Gap:** 335 kWh ## Output when hot | Condition | Cell temperature | 460/LB | 470/LB | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 460 W | 470 W | 100.0% of rated power | | Cool, bright day | 40 °C | 440 W | 450 W | 95.7% of rated power | | Typical summer roof | 55 °C | 420 W | 429 W | 91.3% of rated power | | Hot roof | 70 °C | 400 W | 409 W | 87.0% of rated power | ## Against the whole database | Measure | 460/LB | 470/LB | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,919 | #716 | 14,005 | 470/LB leads by 1,203 places | | Power density | #1,876 | #674 | 14,005 | 470/LB leads by 1,202 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #1,924 | #1,356 | 14,005 | 470/LB leads by 568 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #8,053 | #6,332 | 14,005 | 470/LB leads by 1,721 places | ## Questions ### Which panel is better: JA Solar JAM54D40-460/LB or JA Solar JAM54D40-470/LB? According to our database: **JA Solar JAM54D40-470/LB** has higher module efficiency (**23.50%** vs **23.00%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of JA Solar JAM54D40-460/LB and JA Solar JAM54D40-470/LB? **JA Solar JAM54D40-460/LB** has a module efficiency of **23.00%**, while **JA Solar JAM54D40-470/LB** is **23.50%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does JA Solar JAM54D40-460/LB use vs JA Solar JAM54D40-470/LB? **JA Solar JAM54D40-460/LB** uses **TOPCon** cells; **JA Solar JAM54D40-470/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/LB and JA Solar JAM54D40-470/LB? **JA Solar JAM54D40-460/LB** has a **30 years** power warranty; **JA Solar JAM54D40-470/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/LB and JA Solar JAM54D40-470/LB bifacial panels? Both **JA Solar JAM54D40-460/LB** and **JA Solar JAM54D40-470/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 JAM54D40-460/LB vs JA Solar JAM54D40-475/LB](https://comparepv.com/compare/ja-solar-jam54d40-460-lb-1/ja-solar-jam54d40-475-lb) - 5 differences, the largest is module efficiency - [JA Solar JAM54D40-460/LB vs JA Solar JAM54D40-465/LB](https://comparepv.com/compare/ja-solar-jam54d40-460-lb-1/ja-solar-jam54d40-465-lb) - 2 differences, the largest is product warranty - [JA Solar JAM54D40-460/LB vs JA Solar JAM54D40-455/LB](https://comparepv.com/compare/ja-solar-jam54d40-460-lb-1/ja-solar-jam54d40-455-lb-1) - One difference: module efficiency - [JA Solar JAM54D40-460/LB vs JA Solar JAM54D41-455/LB](https://comparepv.com/compare/ja-solar-jam54d40-460-lb-1/ja-solar-jam54d41-455-lb-1) - 2 differences, the largest is product warranty - [JA Solar JAM54D40-460/LB vs JA Solar JAM54D41 455/LB](https://comparepv.com/compare/ja-solar-jam54d40-460-lb-1/ja-solar-jam54d41-455-lb) - 2 differences, the largest is cell technology - [JA Solar JAM54D40-460/LB vs JA Solar JAM54D40-450/LB](https://comparepv.com/compare/ja-solar-jam54d40-460-lb-1/ja-solar-jam54d40-450-lb-1) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/ja-solar-jam54d40-460-lb-1/ja-solar-jam54d40-470-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.