--- title: "JA Solar JAM60S21-365/MR/1000V vs JA Solar JAM60S21-370/MR/1000V - Solar Panel Comparison | ComparePV" description: "Compare JA Solar JAM60S21-365/MR/1000V vs JA Solar JAM60S21-370/MR/1000V side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/shanghai-ja-solar-technology-co-ltd-jam60s21-365-mr-1000v/shanghai-ja-solar-technology-co-ltd-jam60s21-370-mr-1000v" image: "https://comparepv.com/og/compare/panels/shanghai-ja-solar-technology-co-ltd-jam60s21-365-mr-1000v/shanghai-ja-solar-technology-co-ltd-jam60s21-370-mr-1000v.png" updated: 2026-09-11 --- # JA Solar JAM60S21-365/MR/1000V vs JA Solar JAM60S21-370/MR/1000V 370/MR/1000V leads on the differences that matter The largest is module efficiency: 0.30 pp more efficient. 18 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [JA Solar JAM60S21-365/MR/1000V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam60s21-365-mr-1000v) | [JA Solar JAM60S21-370/MR/1000V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam60s21-370-mr-1000v) | | Manufacturer | JA Solar | JA Solar | | Power | 365 Wp | 370 Wp | | Efficiency | 19.60 % | 19.90 % | | Technology | PERC | PERC | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 365/MR/1000V | 370/MR/1000V | Difference | | --- | --- | --- | --- | | Module efficiency | 19.60 % | 19.90 % | +0.30 pp for 370/MR/1000V | ## Every compared parameter | Parameter | 365/MR/1000V | 370/MR/1000V | | --- | --- | --- | | Rated power | 365 Wp | 370 Wp | | Module efficiency | 19.60 % | 19.90 % | | Power density | 196.1 Wp/m² | 198.8 Wp/m² | | Open-circuit voltage | 41.13 V | 41.30 V | | Voltage at max power | 33.96 V | 34.23 V | | Short-circuit current | 11.30 A | 11.35 A | | Current at max power | 10.75 A | 10.81 A | | Temperature coefficient | -0.350 %/°C | -0.350 %/°C | | Dimensions | 1769x1052x30 mm | 1769x1052x30 mm | | Module area | 1.861 m² | 1.861 m² | | Weight | 18.8 kg | 18.8 kg | | Weight per kWp | 51.5 kg/kWp | 50.8 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 | 120 | 120 | | 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, 365/MR/1000V:** 11,829 kWh - **Cumulative output, 370/MR/1000V:** 11,991 kWh - **Gap:** 162 kWh ## Output when hot | Condition | Cell temperature | 365/MR/1000V | 370/MR/1000V | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 365 W | 370 W | 100.0% of rated power | | Cool, bright day | 40 °C | 346 W | 351 W | 94.8% of rated power | | Typical summer roof | 55 °C | 327 W | 331 W | 89.5% of rated power | | Hot roof | 70 °C | 308 W | 312 W | 84.2% of rated power | ## Against the whole database | Measure | 365/MR/1000V | 370/MR/1000V | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #12,677 | #12,416 | 14,129 | 370/MR/1000V leads by 261 places | | Power density | #12,671 | #12,431 | 14,129 | 370/MR/1000V leads by 240 places | | Heat behaviour | #10,489 | #10,489 | 14,129 | Tied - the same position in the database | | Weight | #4,905 | #4,243 | 14,129 | 370/MR/1000V leads by 662 places | | Warranty | #9,912 | #9,912 | 14,129 | Tied - the same position in the database | | Overall | #12,806 | #12,666 | 14,129 | 370/MR/1000V leads by 140 places | ## Questions ### Which panel is better: JA Solar JAM60S21-365/MR/1000V or JA Solar JAM60S21-370/MR/1000V? According to our database: **JA Solar JAM60S21-370/MR/1000V** has higher module efficiency (**19.90%** vs **19.60%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of JA Solar JAM60S21-365/MR/1000V and JA Solar JAM60S21-370/MR/1000V? **JA Solar JAM60S21-365/MR/1000V** has a module efficiency of **19.60%**, while **JA Solar JAM60S21-370/MR/1000V** is **19.90%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does JA Solar JAM60S21-365/MR/1000V use vs JA Solar JAM60S21-370/MR/1000V? **JA Solar JAM60S21-365/MR/1000V** uses **PERC** cells; **JA Solar JAM60S21-370/MR/1000V** 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 JAM60S21-365/MR/1000V and JA Solar JAM60S21-370/MR/1000V? **JA Solar JAM60S21-365/MR/1000V** has a **25 years** power warranty; **JA Solar JAM60S21-370/MR/1000V** 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 JAM60S21-365/MR/1000V vs JA Solar JAM60S21-390/MR/1000V](https://comparepv.com/compare/shanghai-ja-solar-technology-co-ltd-jam60s21-365-mr-1000v/shanghai-ja-solar-technology-co-ltd-jam60s21-390-mr-1000v) - 5 differences, the largest is module efficiency - [JA Solar JAM60S21-365/MR/1000V vs JA Solar JAM60S21-385/MR/1000V](https://comparepv.com/compare/shanghai-ja-solar-technology-co-ltd-jam60s21-365-mr-1000v/shanghai-ja-solar-technology-co-ltd-jam60s21-385-mr-1000v) - 5 differences, the largest is module efficiency - [JA Solar JAM60S21-365/MR/1000V vs JA Solar JAM60S21-380/MR/1000V](https://comparepv.com/compare/shanghai-ja-solar-technology-co-ltd-jam60s21-365-mr-1000v/shanghai-ja-solar-technology-co-ltd-jam60s21-380-mr-1000v) - 4 differences, the largest is module efficiency - [JA Solar JAM60S21-365/MR/1000V vs JA Solar JAM60S21-375/MR/1000V](https://comparepv.com/compare/shanghai-ja-solar-technology-co-ltd-jam60s21-365-mr-1000v/shanghai-ja-solar-technology-co-ltd-jam60s21-375-mr-1000v) - 3 differences, the largest is module efficiency - [JA Solar JAM60S21-365/MR/1000V vs JA Solar JAM66D46-740/LB](https://comparepv.com/compare/shanghai-ja-solar-technology-co-ltd-jam60s21-365-mr-1000v/ja-solar-jam66d46-740-lb) - 16 differences, the largest is module efficiency - [JA Solar JAM60S21-365/MR/1000V vs JA Solar JAM66D46-735/LB](https://comparepv.com/compare/shanghai-ja-solar-technology-co-ltd-jam60s21-365-mr-1000v/ja-solar-jam66d46-735-lb) - 16 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/shanghai-ja-solar-technology-co-ltd-jam60s21-365-mr-1000v/shanghai-ja-solar-technology-co-ltd-jam60s21-370-mr-1000v 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.