--- title: "Trina Solar TSM-NEG19RC.20-610 vs Trina Solar TSM-NEG21C.20Q-745 - Solar Panel Comparison | ComparePV" description: "Compare Trina Solar TSM-NEG19RC.20-610 vs Trina Solar TSM-NEG21C.20Q-745 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/trina-solar-co-ltd-tsm-neg19rc-20-610/trina-solar-tsm-neg21c-20q-745" image: "https://comparepv.com/og/compare/panels/trina-solar-co-ltd-tsm-neg19rc-20-610/trina-solar-tsm-neg21c-20q-745.png" updated: 2026-09-11 --- # Trina Solar TSM-NEG19RC.20-610 vs Trina Solar TSM-NEG21C.20Q-745 NEG21C.20Q-745 leads on the differences that matter The largest is module efficiency: 1.40 pp more efficient. 5 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Trina Solar TSM-NEG19RC.20-610](https://comparepv.com/panel/trina-solar-co-ltd-tsm-neg19rc-20-610) | [Trina Solar TSM-NEG21C.20Q-745](https://comparepv.com/panel/trina-solar-tsm-neg21c-20q-745) | | Manufacturer | Trina Solar | Trina Solar | | Power | 610 Wp | 745 Wp | | Efficiency | 22.60 % | 24.00 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | NEG19RC.20-610 | NEG21C.20Q-745 | Difference | | --- | --- | --- | --- | | Module efficiency | 22.60 % | 24.00 % | +1.40 pp for NEG21C.20Q-745 | | Rated power | 610 Wp | 745 Wp | +135 W for NEG21C.20Q-745 | | Power density | 225.8 Wp/m² | 239.8 Wp/m² | +14.0 Wp/m² for NEG21C.20Q-745 | | Temperature coefficient | -0.290 %/°C | -0.260 %/°C | +0.030 %/°C for NEG21C.20Q-745 | | Weight | 33.0 kg | 38.3 kg | -5.3 kg for NEG19RC.20-610 | | Short-circuit current | 16.14 A | 18.73 A | 2.59 A apart | | Module area | 2.701 m² | 3.106 m² | 0.405 m² apart | | Open-circuit voltage | 48.09 V | 50.30 V | 2.21 V apart | | Weight per kWp | 54.1 kg/kWp | 51.4 kg/kWp | -2.7 kg/kWp for NEG21C.20Q-745 | | Current at max power | 15.33 A | 17.62 A | 2.29 A apart | | Cell count | 132 | 264 | 132 cells apart | | Voltage at max power | 39.79 V | 42.30 V | 2.51 V apart | | Dimensions | 2382x1134x30 mm | 2384x1303x33 mm | 2382x1134x30 mm vs 2384x1303x33 mm | ## Every compared parameter | Parameter | NEG19RC.20-610 | NEG21C.20Q-745 | | --- | --- | --- | | Rated power | 610 Wp | 745 Wp | | Module efficiency | 22.60 % | 24.00 % | | Power density | 225.8 Wp/m² | 239.8 Wp/m² | | Open-circuit voltage | 48.09 V | 50.30 V | | Voltage at max power | 39.79 V | 42.30 V | | Short-circuit current | 16.14 A | 18.73 A | | Current at max power | 15.33 A | 17.62 A | | Temperature coefficient | -0.290 %/°C | -0.260 %/°C | | Dimensions | 2382x1134x30 mm | 2384x1303x33 mm | | Module area | 2.701 m² | 3.106 m² | | Weight | 33.0 kg | 38.3 kg | | Weight per kWp | 54.1 kg/kWp | 51.4 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | - | 0.35 %/yr | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 264 | | Bifacial | Yes | Yes | ## Thirty-year yield A 1.0% first-year loss then 0.40% a year, assumed for both panels, at 1,200 kWh/kWp a year - **Cumulative output, NEG19RC.20-610:** 20,467 kWh - **Cumulative output, NEG21C.20Q-745:** 24,996 kWh - **Gap:** 4,529 kWh ## Output when hot | Condition | Cell temperature | NEG19RC.20-610 | NEG21C.20Q-745 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 610 W | 745 W | 100.0% of rated power | | Cool, bright day | 40 °C | 583 W | 716 W | 95.7% of rated power | | Typical summer roof | 55 °C | 557 W | 687 W | 91.3% of rated power | | Hot roof | 70 °C | 530 W | 658 W | 87.0% of rated power | ## Against the whole database | Measure | NEG19RC.20-610 | NEG21C.20Q-745 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #3,716 | #329 | 14,129 | NEG21C.20Q-745 leads by 3,387 places | | Power density | #3,788 | #366 | 14,129 | NEG21C.20Q-745 leads by 3,422 places | | Heat behaviour | #2,220 | #515 | 14,129 | NEG21C.20Q-745 leads by 1,705 places | | Weight | #8,404 | #4,829 | 14,129 | NEG21C.20Q-745 leads by 3,575 places | | Warranty | #21 | #21 | 14,129 | Tied - the same position in the database | | Overall | #3,331 | #150 | 14,129 | NEG21C.20Q-745 leads by 3,181 places | ## Questions ### Which panel is better: Trina Solar TSM-NEG19RC.20-610 or Trina Solar TSM-NEG21C.20Q-745? According to our database: **Trina Solar TSM-NEG21C.20Q-745** has higher module efficiency (**24.00%** vs **22.60%**); **Trina Solar TSM-NEG21C.20Q-745** tolerates heat better (temp coeff **-0.260%/°C** vs **-0.290%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Trina Solar TSM-NEG19RC.20-610 and Trina Solar TSM-NEG21C.20Q-745? **Trina Solar TSM-NEG19RC.20-610** has a module efficiency of **22.60%**, while **Trina Solar TSM-NEG21C.20Q-745** is **24.00%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Trina Solar TSM-NEG19RC.20-610 use vs Trina Solar TSM-NEG21C.20Q-745? **Trina Solar TSM-NEG19RC.20-610** uses **TOPCon** cells; **Trina Solar TSM-NEG21C.20Q-745** 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 Trina Solar TSM-NEG19RC.20-610 and Trina Solar TSM-NEG21C.20Q-745? **Trina Solar TSM-NEG19RC.20-610** has a **30 years** power warranty; **Trina Solar TSM-NEG21C.20Q-745** 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 Trina Solar TSM-NEG19RC.20-610 and Trina Solar TSM-NEG21C.20Q-745 bifacial panels? Both **Trina Solar TSM-NEG19RC.20-610** and **Trina Solar TSM-NEG21C.20Q-745** 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 - [Trina Solar TSM-NEG19RC.20-610 vs Trina Solar TSM-NEG21C.20Q-760](https://comparepv.com/compare/trina-solar-co-ltd-tsm-neg19rc-20-610/trina-solar-tsm-neg21c-20q-760) - 13 differences, the largest is module efficiency - [Trina Solar TSM-NEG19RC.20-610 vs Trina Solar TSM-NEG21C.20Q-755](https://comparepv.com/compare/trina-solar-co-ltd-tsm-neg19rc-20-610/trina-solar-tsm-neg21c-20q-755) - 13 differences, the largest is module efficiency - [Trina Solar TSM-NEG19RC.20-610 vs Trina Solar TSM-NEG21C.20Q-750](https://comparepv.com/compare/trina-solar-co-ltd-tsm-neg19rc-20-610/trina-solar-tsm-neg21c-20q-750) - 13 differences, the largest is module efficiency - [Trina Solar TSM-NEG19RC.20-610 vs Trina Solar TSM-NEG21C.20-740](https://comparepv.com/compare/trina-solar-co-ltd-tsm-neg19rc-20-610/trina-solar-co-ltd-tsm-neg21c-20-740) - 11 differences, the largest is module efficiency - [Trina Solar TSM-NEG19RC.20-610 vs Trina Solar TSM-NEG21C.20 740](https://comparepv.com/compare/trina-solar-co-ltd-tsm-neg19rc-20-610/trina-solar-tsm-neg21c-20-740) - 11 differences, the largest is module efficiency - [Trina Solar TSM-NEG19RC.20-610 vs Trina Solar TSM-NEG21C.20Q-740](https://comparepv.com/compare/trina-solar-co-ltd-tsm-neg19rc-20-610/trina-solar-tsm-neg21c-20q-740) - 13 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/trina-solar-co-ltd-tsm-neg19rc-20-610/trina-solar-tsm-neg21c-20q-745 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.