--- title: "JA Solar JAM54S30-390/MR vs JA Solar JAM54S30-395/MR - Solar Panel Comparison | ComparePV" description: "Compare JA Solar JAM54S30-390/MR vs JA Solar JAM54S30-395/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-jam54s30-390-mr/ja-solar-jam54s30-395-mr" updated: 2026-09-11 --- # JA Solar JAM54S30-390/MR vs JA Solar JAM54S30-395/MR 395/MR leads on the differences that matter The largest is module efficiency: 0.20 pp more efficient. 18 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [JA Solar JAM54S30-390/MR](https://comparepv.com/panel/ja-solar-jam54s30-390-mr) | [JA Solar JAM54S30-395/MR](https://comparepv.com/panel/ja-solar-jam54s30-395-mr) | | Manufacturer | JA Solar | JA Solar | | Power | 390 Wp | 395 Wp | | Efficiency | 20.00 % | 20.20 % | | Technology | PERC | PERC | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 390/MR | 395/MR | Difference | | --- | --- | --- | --- | | Module efficiency | 20.00 % | 20.20 % | +0.20 pp for 395/MR | ## Every compared parameter | Parameter | 390/MR | 395/MR | | --- | --- | --- | | Rated power | 390 Wp | 395 Wp | | Module efficiency | 20.00 % | 20.20 % | | Power density | 199.7 Wp/m² | 202.3 Wp/m² | | Open-circuit voltage | 36.85 V | 36.98 V | | Voltage at max power | 30.64 V | 30.84 V | | Short-circuit current | 13.61 A | 13.70 A | | Current at max power | 12.73 A | 12.81 A | | Temperature coefficient | -0.350 %/°C | -0.350 %/°C | | Dimensions | 1722x1134x30 mm | 1722x1134x30 mm | | Module area | 1.953 m² | 1.953 m² | | Weight | 19.5 kg | 19.5 kg | | Weight per kWp | 50.0 kg/kWp | 49.4 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 | 108 | 108 | | 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, 390/MR:** 12,640 kWh - **Cumulative output, 395/MR:** 12,802 kWh - **Gap:** 162 kWh ## Output when hot | Condition | Cell temperature | 390/MR | 395/MR | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 390 W | 395 W | 100.0% of rated power | | Cool, bright day | 40 °C | 370 W | 374 W | 94.8% of rated power | | Typical summer roof | 55 °C | 349 W | 354 W | 89.5% of rated power | | Hot roof | 70 °C | 329 W | 333 W | 84.2% of rated power | ## Against the whole database | Measure | 390/MR | 395/MR | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #12,214 | #11,956 | 14,005 | 395/MR leads by 258 places | | Power density | #12,255 | #11,887 | 14,005 | 395/MR leads by 368 places | | Heat behaviour | #10,419 | #10,419 | 14,005 | Tied - the same position in the database | | Weight | #3,317 | #2,878 | 14,005 | 395/MR leads by 439 places | | Warranty | #9,798 | #9,798 | 14,005 | Tied - the same position in the database | | Overall | #12,390 | #12,239 | 14,005 | 395/MR leads by 151 places | ## Questions ### Which panel is better: JA Solar JAM54S30-390/MR or JA Solar JAM54S30-395/MR? According to our database: **JA Solar JAM54S30-395/MR** has higher module efficiency (**20.20%** vs **20.00%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of JA Solar JAM54S30-390/MR and JA Solar JAM54S30-395/MR? **JA Solar JAM54S30-390/MR** has a module efficiency of **20.00%**, while **JA Solar JAM54S30-395/MR** is **20.20%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does JA Solar JAM54S30-390/MR use vs JA Solar JAM54S30-395/MR? **JA Solar JAM54S30-390/MR** uses **PERC** cells; **JA Solar JAM54S30-395/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 JAM54S30-390/MR and JA Solar JAM54S30-395/MR? **JA Solar JAM54S30-390/MR** has a **25 years** power warranty; **JA Solar JAM54S30-395/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 JAM54S30-390/MR vs JA Solar JAM54S30-415/MR](https://comparepv.com/compare/ja-solar-jam54s30-390-mr/ja-solar-jam54s30-415-mr) - 4 differences, the largest is module efficiency - [JA Solar JAM54S30-390/MR vs JA Solar JAM54S30-410/MR](https://comparepv.com/compare/ja-solar-jam54s30-390-mr/ja-solar-jam54s30-410-mr) - 4 differences, the largest is module efficiency - [JA Solar JAM54S30-390/MR vs JA Solar JAM54S30-405/MR](https://comparepv.com/compare/ja-solar-jam54s30-390-mr/ja-solar-jam54s30-405-mr) - 3 differences, the largest is module efficiency - [JA Solar JAM54S30-390/MR vs JA Solar JAM54S30-400/MR](https://comparepv.com/compare/ja-solar-jam54s30-390-mr/ja-solar-jam54s30-400-mr) - 3 differences, the largest is module efficiency - [JA Solar JAM54S30-390/MR vs JA Solar JAM66D46-740/LB](https://comparepv.com/compare/ja-solar-jam54s30-390-mr/ja-solar-jam66d46-740-lb) - 16 differences, the largest is module efficiency - [JA Solar JAM54S30-390/MR vs JA Solar JAM66D46-735/LB](https://comparepv.com/compare/ja-solar-jam54s30-390-mr/ja-solar-jam66d46-735-lb) - 16 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/ja-solar-jam54s30-390-mr/ja-solar-jam54s30-395-mr 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.