--- title: "JA Solar JAM66D46-720/LB vs Trina Solar TSM-NEG21C.20 725W - Solar Panel Comparison | ComparePV" description: "Compare JA Solar JAM66D46-720/LB vs Trina Solar TSM-NEG21C.20 725W 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-jam66d46-720-lb/trina-solar-tsm-neg21c-20-725w" updated: 2026-09-11 --- # JA Solar JAM66D46-720/LB vs Trina Solar TSM-NEG21C.20 725W Identical on every published parameter All 19 comparable parameters agree. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [JA Solar JAM66D46-720/LB](https://comparepv.com/panel/ja-solar-jam66d46-720-lb) | [Trina Solar TSM-NEG21C.20 725W](https://comparepv.com/panel/trina-solar-tsm-neg21c-20-725w) | | Manufacturer | JA Solar | Trina Solar | | Power | 720 Wp | 725 Wp | | Efficiency | 23.20 % | 23.30 % | | Technology | TOPCon | TOPCon | ## Every compared parameter | Parameter | JAM66D46-720/LB | TSM-NEG21C.20 725W | | --- | --- | --- | | Rated power | 720 Wp | 725 Wp | | Module efficiency | 23.20 % | 23.30 % | | Power density | 231.8 Wp/m² | 233.4 Wp/m² | | Open-circuit voltage | 49.00 V | 49.60 V | | Voltage at max power | 41.19 V | 41.50 V | | Short-circuit current | 18.59 A | 18.54 A | | Current at max power | 17.48 A | 17.47 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2384x1303x33 mm | 2384x1303x33 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 38.2 kg | 38.3 kg | | Weight per kWp | 53.1 kg/kWp | 52.8 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 | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 132 | | 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, JAM66D46-720/LB:** 24,157 kWh - **Cumulative output, TSM-NEG21C.20 725W:** 24,325 kWh - **Gap:** 168 kWh ## Output when hot | Condition | Cell temperature | JAM66D46-720/LB | TSM-NEG21C.20 725W | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 720 W | 725 W | 100.0% of rated power | | Cool, bright day | 40 °C | 689 W | 693 W | 95.7% of rated power | | Typical summer roof | 55 °C | 657 W | 662 W | 91.3% of rated power | | Hot roof | 70 °C | 626 W | 630 W | 87.0% of rated power | ## Against the whole database | Measure | JAM66D46-720/LB | TSM-NEG21C.20 725W | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,306 | #1,017 | 14,005 | TSM-NEG21C.20 725W leads by 289 places | | Power density | #1,347 | #936 | 14,005 | TSM-NEG21C.20 725W leads by 411 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #6,810 | #6,514 | 14,005 | TSM-NEG21C.20 725W leads by 296 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #516 | #424 | 14,005 | TSM-NEG21C.20 725W leads by 92 places | ## Questions ### Which panel is better: JA Solar JAM66D46-720/LB or Trina Solar TSM-NEG21C.20 725W? According to our database: **Trina Solar TSM-NEG21C.20 **725 W**** has higher module efficiency (**23.30%** vs **23.20%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of JA Solar JAM66D46-720/LB and Trina Solar TSM-NEG21C.20 725W? **JA Solar JAM66D46-720/LB** has a module efficiency of **23.20%**, while **Trina Solar TSM-NEG21C.20 **725 W**** is **23.30%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does JA Solar JAM66D46-720/LB use vs Trina Solar TSM-NEG21C.20 725W? **JA Solar JAM66D46-720/LB** uses **TOPCon** cells; **Trina Solar TSM-NEG21C.20 **725 W**** 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 JAM66D46-720/LB and Trina Solar TSM-NEG21C.20 725W? **JA Solar JAM66D46-720/LB** has a **30 years** power warranty; **Trina Solar TSM-NEG21C.20 **725 W**** 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 JAM66D46-720/LB and Trina Solar TSM-NEG21C.20 725W bifacial panels? Both **JA Solar JAM66D46-720/LB** and **Trina Solar TSM-NEG21C.20 **725 W**** 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 JAM66D46-720/LB vs JA Solar JAM66D46-740/LB](https://comparepv.com/compare/ja-solar-jam66d46-720-lb/ja-solar-jam66d46-740-lb) - 3 differences, the largest is module efficiency - [JA Solar JAM66D46-720/LB vs JA Solar JAM66D46-735/LB](https://comparepv.com/compare/ja-solar-jam66d46-720-lb/ja-solar-jam66d46-735-lb) - 3 differences, the largest is module efficiency - [JA Solar JAM66D46-720/LB vs JA Solar JAM66D46-730/LB](https://comparepv.com/compare/ja-solar-jam66d46-720-lb/ja-solar-jam66d46-730-lb) - 3 differences, the largest is module efficiency - [JA Solar JAM66D46-720/LB vs JA Solar JAM66D46-725/LB](https://comparepv.com/compare/ja-solar-jam66d46-720-lb/ja-solar-jam66d46-725-lb) - The same specification on paper - [JA Solar JAM66D46-720/LB vs JA Solar JAM66D46-715/LB](https://comparepv.com/compare/ja-solar-jam66d46-720-lb/ja-solar-jam66d46-715-lb) - One difference: module efficiency - [JA Solar JAM66D46-720/LB vs JA Solar JAM66D46-710/LB](https://comparepv.com/compare/ja-solar-jam66d46-720-lb/ja-solar-jam66d46-710-lb) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/ja-solar-jam66d46-720-lb/trina-solar-tsm-neg21c-20-725w 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.