--- title: "Trina Solar TSM-DEG21C.20-650 vs Trina Solar TSM-NEG21C.20-740 - Solar Panel Comparison | ComparePV" description: "Compare Trina Solar TSM-DEG21C.20-650 vs Trina Solar TSM-NEG21C.20-740 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-deg21c-20-650/trina-solar-co-ltd-tsm-neg21c-20-740" updated: 2026-09-11 --- # Trina Solar TSM-DEG21C.20-650 vs Trina Solar TSM-NEG21C.20-740 NEG21C.20-740 leads on the differences that matter The largest is module efficiency: 2.90 pp more efficient. 10 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Trina Solar TSM-DEG21C.20-650](https://comparepv.com/panel/trina-solar-co-ltd-tsm-deg21c-20-650) | [Trina Solar TSM-NEG21C.20-740](https://comparepv.com/panel/trina-solar-co-ltd-tsm-neg21c-20-740) | | Manufacturer | Trina Solar | Trina Solar | | Power | 650 Wp | 740 Wp | | Efficiency | 20.90 % | 23.80 % | | Technology | PERC | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | DEG21C.20-650 | NEG21C.20-740 | Difference | | --- | --- | --- | --- | | Module efficiency | 20.90 % | 23.80 % | +2.90 pp for NEG21C.20-740 | | Temperature coefficient | -0.340 %/°C | -0.290 %/°C | +0.050 %/°C for NEG21C.20-740 | | Rated power | 650 Wp | 740 Wp | +90 W for NEG21C.20-740 | | Power density | 209.2 Wp/m² | 238.2 Wp/m² | +29.0 Wp/m² for NEG21C.20-740 | | Weight per kWp | 58.9 kg/kWp | 51.8 kg/kWp | -7.2 kg/kWp for NEG21C.20-740 | | Open-circuit voltage | 45.50 V | 50.30 V | 4.80 V apart | | Cell technology | PERC | TOPCon | PERC vs TOPCon | | Voltage at max power | 37.70 V | 42.10 V | 4.40 V apart | | Annual degradation | 0.45 %/yr | 0.40 %/yr | -0.05 %/yr for NEG21C.20-740 | ## Every compared parameter | Parameter | DEG21C.20-650 | NEG21C.20-740 | | --- | --- | --- | | Rated power | 650 Wp | 740 Wp | | Module efficiency | 20.90 % | 23.80 % | | Power density | 209.2 Wp/m² | 238.2 Wp/m² | | Open-circuit voltage | 45.50 V | 50.30 V | | Voltage at max power | 37.70 V | 42.10 V | | Short-circuit current | 18.35 A | 18.66 A | | Current at max power | 17.27 A | 17.58 A | | Temperature coefficient | -0.340 %/°C | -0.290 %/°C | | Dimensions | 2384x1303x33 mm | 2384x1303x33 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 38.3 kg | 38.3 kg | | Weight per kWp | 58.9 kg/kWp | 51.8 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.45 %/yr | 0.40 %/yr | | Cell technology | PERC | 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 - **Cumulative output, DEG21C.20-650:** 21,405 kWh - **Cumulative output, NEG21C.20-740:** 24,828 kWh - **Gap:** 3,423 kWh ## Output when hot | Condition | Cell temperature | DEG21C.20-650 | NEG21C.20-740 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 650 W | 740 W | 100.0% of rated power | | Cool, bright day | 40 °C | 617 W | 708 W | 94.9% of rated power | | Typical summer roof | 55 °C | 584 W | 676 W | 89.8% of rated power | | Hot roof | 70 °C | 551 W | 643 W | 84.7% of rated power | ## Against the whole database | Measure | DEG21C.20-650 | NEG21C.20-740 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #10,072 | #433 | 14,005 | NEG21C.20-740 leads by 9,639 places | | Power density | #10,011 | #431 | 14,005 | NEG21C.20-740 leads by 9,580 places | | Heat behaviour | #8,778 | #2,165 | 14,005 | NEG21C.20-740 leads by 6,613 places | | Weight | #11,952 | #5,125 | 14,005 | NEG21C.20-740 leads by 6,827 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #3,971 | #185 | 14,005 | NEG21C.20-740 leads by 3,786 places | ## Questions ### Which panel is better: Trina Solar TSM-DEG21C.20-650 or Trina Solar TSM-NEG21C.20-740? According to our database: **Trina Solar TSM-NEG21C.20-740** has higher module efficiency (**23.80%** vs **20.90%**); **Trina Solar TSM-NEG21C.20-740** tolerates heat better (temp coeff **-0.290%/°C** vs **-0.340%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Trina Solar TSM-DEG21C.20-650 and Trina Solar TSM-NEG21C.20-740? **Trina Solar TSM-DEG21C.20-650** has a module efficiency of **20.90%**, while **Trina Solar TSM-NEG21C.20-740** is **23.80%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Trina Solar TSM-DEG21C.20-650 use vs Trina Solar TSM-NEG21C.20-740? **Trina Solar TSM-DEG21C.20-650** uses **PERC** cells; **Trina Solar TSM-NEG21C.20-740** 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-DEG21C.20-650 and Trina Solar TSM-NEG21C.20-740? **Trina Solar TSM-DEG21C.20-650** has a **30 years** power warranty; **Trina Solar TSM-NEG21C.20-740** 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-DEG21C.20-650 and Trina Solar TSM-NEG21C.20-740 bifacial panels? Both **Trina Solar TSM-DEG21C.20-650** and **Trina Solar TSM-NEG21C.20-740** 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-DEG21C.20-650 vs Trina Solar TSM-DEG21C.20-665](https://comparepv.com/compare/trina-solar-co-ltd-tsm-deg21c-20-650/trina-solar-co-ltd-tsm-deg21c-20-665) - 3 differences, the largest is module efficiency - [Trina Solar TSM-DEG21C.20-650 vs Trina Solar TSM-DEG21C.20-660](https://comparepv.com/compare/trina-solar-co-ltd-tsm-deg21c-20-650/trina-solar-co-ltd-tsm-deg21c-20-660) - 3 differences, the largest is module efficiency - [Trina Solar TSM-DEG21C.20-650 vs Trina Solar TSM-DEG21C.20-655](https://comparepv.com/compare/trina-solar-co-ltd-tsm-deg21c-20-650/trina-solar-co-ltd-tsm-deg21c-20-655) - One difference: module efficiency - [Trina Solar TSM-DEG21C.20-650 vs Trina Solar TSM-DEG21C.20-645](https://comparepv.com/compare/trina-solar-co-ltd-tsm-deg21c-20-650/trina-solar-co-ltd-tsm-deg21c-20-645) - The same specification on paper - [Trina Solar TSM-NEG21C.20-740 vs Trina Solar TSM-NEG21C.20-735](https://comparepv.com/compare/trina-solar-co-ltd-tsm-neg21c-20-740/trina-solar-co-ltd-tsm-neg21c-20-735) - The same specification on paper - [Trina Solar TSM-NEG21C.20-740 vs Trina Solar TSM-NEG21C.20-730](https://comparepv.com/compare/trina-solar-co-ltd-tsm-neg21c-20-740/trina-solar-co-ltd-tsm-neg21c-20-730) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/trina-solar-co-ltd-tsm-deg21c-20-650/trina-solar-co-ltd-tsm-neg21c-20-740 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.