--- title: "JA Solar JAM72S20-450/MR vs JA Solar JAM72S20-470/MR - Solar Panel Comparison | ComparePV" description: "Compare JA Solar JAM72S20-450/MR vs JA Solar JAM72S20-470/MR 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-jam72s20-450-mr-1/ja-solar-jam72s20-470-mr-1" updated: 2026-09-11 --- # JA Solar JAM72S20-450/MR vs JA Solar JAM72S20-470/MR 470/MR leads on the differences that matter The largest is module efficiency: 0.90 pp more efficient. 14 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [JA Solar JAM72S20-450/MR](https://comparepv.com/panel/ja-solar-jam72s20-450-mr-1) | [JA Solar JAM72S20-470/MR](https://comparepv.com/panel/ja-solar-jam72s20-470-mr-1) | | Manufacturer | JA Solar | JA Solar | | Power | 450 Wp | 470 Wp | | Efficiency | 20.30 % | 21.20 % | | Technology | PERC | PERC | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 450/MR | 470/MR | Difference | | --- | --- | --- | --- | | Module efficiency | 20.30 % | 21.20 % | +0.90 pp for 470/MR | | Power density | 202.5 Wp/m² | 211.5 Wp/m² | +9.0 Wp/m² for 470/MR | | Rated power | 450 Wp | 470 Wp | +20 W for 470/MR | | Weight per kWp | 54.4 kg/kWp | 52.1 kg/kWp | -2.3 kg/kWp for 470/MR | | Voltage at max power | 41.52 V | 42.69 V | 1.17 V apart | ## Every compared parameter | Parameter | 450/MR | 470/MR | | --- | --- | --- | | Rated power | 450 Wp | 470 Wp | | Module efficiency | 20.30 % | 21.20 % | | Power density | 202.5 Wp/m² | 211.5 Wp/m² | | Open-circuit voltage | 49.70 V | 50.31 V | | Voltage at max power | 41.52 V | 42.69 V | | Short-circuit current | 11.36 A | 11.53 A | | Current at max power | 10.84 A | 11.01 A | | Temperature coefficient | -0.350 %/°C | -0.350 %/°C | | Dimensions | 2112x1052x35 mm | 2112x1052x35 mm | | Module area | 2.222 m² | 2.222 m² | | Weight | 24.5 kg | 24.5 kg | | Weight per kWp | 54.4 kg/kWp | 52.1 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 25 yrs | 25 yrs | | Annual degradation | 0.55 %/yr | 0.55 %/yr | | Cell technology | PERC | PERC | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 144 | 144 | | 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 (-0.350 %/°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, 450/MR:** 14,584 kWh - **Cumulative output, 470/MR:** 15,232 kWh - **Gap:** 648 kWh ## Output when hot | Condition | Cell temperature | 450/MR | 470/MR | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 450 W | 470 W | 100.0% of rated power | | Cool, bright day | 40 °C | 426 W | 445 W | 94.8% of rated power | | Typical summer roof | 55 °C | 403 W | 421 W | 89.5% of rated power | | Hot roof | 70 °C | 379 W | 396 W | 84.2% of rated power | ## Against the whole database | Measure | 450/MR | 470/MR | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #11,769 | #9,076 | 14,005 | 470/MR leads by 2,693 places | | Power density | #11,847 | #9,193 | 14,005 | 470/MR leads by 2,654 places | | Heat behaviour | #10,419 | #10,419 | 14,005 | Tied - the same position in the database | | Weight | #8,755 | #5,602 | 14,005 | 470/MR leads by 3,153 places | | Warranty | #9,798 | #9,798 | 14,005 | Tied - the same position in the database | | Overall | #11,425 | #10,418 | 14,005 | 470/MR leads by 1,007 places | ## Questions ### Which panel is better: JA Solar JAM72S20-450/MR or JA Solar JAM72S20-470/MR? According to our database: **JA Solar JAM72S20-470/MR** has higher module efficiency (**21.20%** vs **20.30%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of JA Solar JAM72S20-450/MR and JA Solar JAM72S20-470/MR? **JA Solar JAM72S20-450/MR** has a module efficiency of **20.30%**, while **JA Solar JAM72S20-470/MR** is **21.20%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does JA Solar JAM72S20-450/MR use vs JA Solar JAM72S20-470/MR? **JA Solar JAM72S20-450/MR** uses **PERC** cells; **JA Solar JAM72S20-470/MR** uses **PERC**. 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 JAM72S20-450/MR and JA Solar JAM72S20-470/MR? **JA Solar JAM72S20-450/MR** has a **25 years** power warranty; **JA Solar JAM72S20-470/MR** has a **25 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 JAM72S20-450/MR vs JA Solar JAM72S20-465/MR](https://comparepv.com/compare/ja-solar-jam72s20-450-mr-1/ja-solar-jam72s20-465-mr-1) - 3 differences, the largest is module efficiency - [JA Solar JAM72S20-450/MR vs JA Solar JAM72S20-460/MR](https://comparepv.com/compare/ja-solar-jam72s20-450-mr-1/ja-solar-jam72s20-460-mr-1) - 3 differences, the largest is module efficiency - [JA Solar JAM72S20-450/MR vs JA Solar JAM72S20-455/MR](https://comparepv.com/compare/ja-solar-jam72s20-450-mr-1/ja-solar-jam72s20-455-mr-1) - One difference: module efficiency - [JA Solar JAM72S20-450/MR vs JA Solar JAM72S20-445/MR](https://comparepv.com/compare/ja-solar-jam72s20-450-mr-1/ja-solar-jam72s20-445-mr-1) - One difference: module efficiency - [JA Solar JAM72S20-450/MR vs JA Solar JAM66D46-740/LB](https://comparepv.com/compare/ja-solar-jam72s20-450-mr-1/ja-solar-jam66d46-740-lb) - 15 differences, the largest is module efficiency - [JA Solar JAM72S20-450/MR vs JA Solar JAM66D46-735/LB](https://comparepv.com/compare/ja-solar-jam72s20-450-mr-1/ja-solar-jam66d46-735-lb) - 15 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/ja-solar-jam72s20-450-mr-1/ja-solar-jam72s20-470-mr-1 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.