--- title: "JA Solar JAM72D40-600/MB vs JA Solar JAM78D40-610/MB/1500V - Solar Panel Comparison | ComparePV" description: "Compare JA Solar JAM72D40-600/MB vs JA Solar JAM78D40-610/MB/1500V 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-jam72d40-600-mb/ja-solar-jam78d40-610-mb-1500v" updated: 2026-09-11 --- # JA Solar JAM72D40-600/MB vs JA Solar JAM78D40-610/MB/1500V JAM72D40-600/MB leads on the differences that matter The largest is module efficiency: 1.40 pp more efficient. 7 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [JA Solar JAM72D40-600/MB](https://comparepv.com/panel/ja-solar-jam72d40-600-mb) | [JA Solar JAM78D40-610/MB/1500V](https://comparepv.com/panel/ja-solar-jam78d40-610-mb-1500v) | | Manufacturer | JA Solar | JA Solar | | Power | 600 Wp | 610 Wp | | Efficiency | 23.20 % | 21.80 % | | Technology | TOPCon | N-type | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | JAM72D40-600/MB | JAM78D40-610/MB/1500V | Difference | | --- | --- | --- | --- | | Module efficiency | 23.20 % | 21.80 % | +1.40 pp for JAM72D40-600/MB | | Power density | 232.3 Wp/m² | 218.2 Wp/m² | +14.0 Wp/m² for JAM72D40-600/MB | | Weight | 31.8 kg | 34.6 kg | -2.8 kg for JAM72D40-600/MB | | Module area | 2.583 m² | 2.795 m² | 0.212 m² apart | | Weight per kWp | 53.0 kg/kWp | 56.7 kg/kWp | -3.7 kg/kWp for JAM72D40-600/MB | | Temperature coefficient | -0.290 %/°C | -0.300 %/°C | +0.010 %/°C for JAM72D40-600/MB | | Cell technology | TOPCon | N-type | TOPCon vs N-type | | Open-circuit voltage | 52.79 V | 55.05 V | 2.26 V apart | | Rated power | 600 Wp | 610 Wp | +10 W for JAM78D40-610/MB/1500V | | Cell count | 144 | 156 | 12 cells apart | | Dimensions | 2278x1134x30 mm | 2465x1134x35 mm | 2278x1134x30 mm vs 2465x1134x35 mm | | Voltage at max power | 44.85 V | 45.94 V | 1.09 V apart | ## Every compared parameter | Parameter | JAM72D40-600/MB | JAM78D40-610/MB/1500V | | --- | --- | --- | | Rated power | 600 Wp | 610 Wp | | Module efficiency | 23.20 % | 21.80 % | | Power density | 232.3 Wp/m² | 218.2 Wp/m² | | Open-circuit voltage | 52.79 V | 55.05 V | | Voltage at max power | 44.85 V | 45.94 V | | Short-circuit current | 14.04 A | 14.16 A | | Current at max power | 13.38 A | 13.28 A | | Temperature coefficient | -0.290 %/°C | -0.300 %/°C | | Dimensions | 2278x1134x30 mm | 2465x1134x35 mm | | Module area | 2.583 m² | 2.795 m² | | Weight | 31.8 kg | 34.6 kg | | Weight per kWp | 53.0 kg/kWp | 56.7 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | TOPCon | N-type | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 144 | 156 | | Bifacial | Yes | Yes | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year - **Cumulative output, JAM72D40-600/MB:** 20,131 kWh - **Cumulative output, JAM78D40-610/MB/1500V:** 20,467 kWh - **Gap:** 336 kWh ## Output when hot | Condition | Cell temperature | JAM72D40-600/MB | JAM78D40-610/MB/1500V | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 600 W | 610 W | 100.0% of rated power | | Cool, bright day | 40 °C | 574 W | 583 W | 95.5% of rated power | | Typical summer roof | 55 °C | 548 W | 555 W | 91.0% of rated power | | Hot roof | 70 °C | 522 W | 528 W | 86.5% of rated power | ## Against the whole database | Measure | JAM72D40-600/MB | JAM78D40-610/MB/1500V | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,306 | #7,022 | 14,005 | JAM72D40-600/MB leads by 5,716 places | | Power density | #1,252 | #6,971 | 14,005 | JAM72D40-600/MB leads by 5,719 places | | Heat behaviour | #2,165 | #6,093 | 14,005 | JAM72D40-600/MB leads by 3,928 places | | Weight | #6,725 | #10,826 | 14,005 | JAM72D40-600/MB leads by 4,101 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #2,960 | #4,272 | 14,005 | JAM72D40-600/MB leads by 1,312 places | ## Questions ### Which panel is better: JA Solar JAM72D40-600/MB or JA Solar JAM78D40-610/MB/1500V? According to our database: **JA Solar JAM72D40-600/MB** has higher module efficiency (**23.20%** vs **21.80%**); **JA Solar JAM72D40-600/MB** tolerates heat better (temp coeff **-0.290%/°C** vs **-0.300%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of JA Solar JAM72D40-600/MB and JA Solar JAM78D40-610/MB/1500V? **JA Solar JAM72D40-600/MB** has a module efficiency of **23.20%**, while **JA Solar JAM78D40-610/MB/1500V** is **21.80%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does JA Solar JAM72D40-600/MB use vs JA Solar JAM78D40-610/MB/1500V? **JA Solar JAM72D40-600/MB** uses **TOPCon** cells; **JA Solar JAM78D40-610/MB/1500V** uses **N-type**. 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 JAM72D40-600/MB and JA Solar JAM78D40-610/MB/1500V? **JA Solar JAM72D40-600/MB** has a **30 years** power warranty; **JA Solar JAM78D40-610/MB/1500V** 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 JAM72D40-600/MB and JA Solar JAM78D40-610/MB/1500V bifacial panels? Both **JA Solar JAM72D40-600/MB** and **JA Solar JAM78D40-610/MB/1500V** 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 JAM72D40-600/MB vs JA Solar JAM78D40-625/MB/1500V](https://comparepv.com/compare/ja-solar-jam72d40-600-mb/ja-solar-jam78d40-625-mb-1500v) - 12 differences, the largest is module efficiency - [JA Solar JAM72D40-600/MB vs JA Solar JAM78D40-620/MB/1500V](https://comparepv.com/compare/ja-solar-jam72d40-600-mb/ja-solar-jam78d40-620-mb-1500v) - 12 differences, the largest is module efficiency - [JA Solar JAM72D40-600/MB vs JA Solar JAM78D40-615/MB/1500V](https://comparepv.com/compare/ja-solar-jam72d40-600-mb/ja-solar-jam78d40-615-mb-1500v) - 12 differences, the largest is module efficiency - [JA Solar JAM72D40-600/MB vs JA Solar JAM72D40-605/MB](https://comparepv.com/compare/ja-solar-jam72d40-600-mb/ja-solar-jam72d40-605-mb) - One difference: module efficiency - [JA Solar JAM72D40-600/MB vs JA Solar JAM78D40-605/MB/1500V](https://comparepv.com/compare/ja-solar-jam72d40-600-mb/ja-solar-jam78d40-605-mb-1500v) - 10 differences, the largest is module efficiency - [JA Solar JAM72D40-600/MB vs JA Solar JAM78D40-600/MB/1500V](https://comparepv.com/compare/ja-solar-jam72d40-600-mb/ja-solar-jam78d40-600-mb-1500v) - 10 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/ja-solar-jam72d40-600-mb/ja-solar-jam78d40-610-mb-1500v 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.