--- title: "Trina Solar TSM-NEG19RC.70-620 vs Trina Solar TSM-NEG19RC.70-640 - Solar Panel Comparison | ComparePV" description: "Compare Trina Solar TSM-NEG19RC.70-620 vs Trina Solar TSM-NEG19RC.70-640 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-tsm-neg19rc-70-620/trina-solar-tsm-neg19rc-70-640" updated: 2026-09-11 --- # Trina Solar TSM-NEG19RC.70-620 vs Trina Solar TSM-NEG19RC.70-640 640 leads on the differences that matter The largest is module efficiency: 0.70 pp more efficient. 16 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Trina Solar TSM-NEG19RC.70-620](https://comparepv.com/panel/trina-solar-tsm-neg19rc-70-620) | [Trina Solar TSM-NEG19RC.70-640](https://comparepv.com/panel/trina-solar-tsm-neg19rc-70-640) | | Manufacturer | Trina Solar | Trina Solar | | Power | 620 Wp | 640 Wp | | Efficiency | 23.00 % | 23.70 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 620 | 640 | Difference | | --- | --- | --- | --- | | Module efficiency | 23.00 % | 23.70 % | +0.70 pp for 640 | | Power density | 229.5 Wp/m² | 236.9 Wp/m² | +7.4 Wp/m² for 640 | | Rated power | 620 Wp | 640 Wp | +20 W for 640 | ## Every compared parameter | Parameter | 620 | 640 | | --- | --- | --- | | Rated power | 620 Wp | 640 Wp | | Module efficiency | 23.00 % | 23.70 % | | Power density | 229.5 Wp/m² | 236.9 Wp/m² | | Open-circuit voltage | 48.50 V | 49.30 V | | Voltage at max power | 40.24 V | 41.06 V | | Short-circuit current | 16.26 A | 16.51 A | | Current at max power | 15.41 A | 15.60 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2382x1134x30 mm | 2382x1134x30 mm | | Module area | 2.701 m² | 2.701 m² | | Weight | 33.0 kg | 33.0 kg | | Weight per kWp | 53.2 kg/kWp | 51.6 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, 620:** 20,802 kWh - **Cumulative output, 640:** 21,473 kWh - **Gap:** 671 kWh ## Output when hot | Condition | Cell temperature | 620 | 640 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 620 W | 640 W | 100.0% of rated power | | Cool, bright day | 40 °C | 593 W | 612 W | 95.7% of rated power | | Typical summer roof | 55 °C | 566 W | 584 W | 91.3% of rated power | | Hot roof | 70 °C | 539 W | 556 W | 87.0% of rated power | ## Against the whole database | Measure | 620 | 640 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,919 | #517 | 14,005 | 640 leads by 1,402 places | | Power density | #2,191 | #521 | 14,005 | 640 leads by 1,670 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #7,064 | #4,940 | 14,005 | 640 leads by 2,124 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #2,537 | #1,540 | 14,005 | 640 leads by 997 places | ## Questions ### Which panel is better: Trina Solar TSM-NEG19RC.70-620 or Trina Solar TSM-NEG19RC.70-640? According to our database: **Trina Solar TSM-NEG19RC.70-640** has higher module efficiency (**23.70%** vs **23.00%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Trina Solar TSM-NEG19RC.70-620 and Trina Solar TSM-NEG19RC.70-640? **Trina Solar TSM-NEG19RC.70-620** has a module efficiency of **23.00%**, while **Trina Solar TSM-NEG19RC.70-640** is **23.70%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Trina Solar TSM-NEG19RC.70-620 use vs Trina Solar TSM-NEG19RC.70-640? **Trina Solar TSM-NEG19RC.70-620** uses **TOPCon** cells; **Trina Solar TSM-NEG19RC.70-640** 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.70-620 and Trina Solar TSM-NEG19RC.70-640? **Trina Solar TSM-NEG19RC.70-620** has a **30 years** power warranty; **Trina Solar TSM-NEG19RC.70-640** 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.70-620 and Trina Solar TSM-NEG19RC.70-640 bifacial panels? Both **Trina Solar TSM-NEG19RC.70-620** and **Trina Solar TSM-NEG19RC.70-640** 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.70-620 vs Trina Solar TSM-NEG19RC.70-635](https://comparepv.com/compare/trina-solar-tsm-neg19rc-70-620/trina-solar-tsm-neg19rc-70-635) - 3 differences, the largest is module efficiency - [Trina Solar TSM-NEG19RC.70-620 vs Trina Solar TSM-NEG19RC.70-630](https://comparepv.com/compare/trina-solar-tsm-neg19rc-70-620/trina-solar-tsm-neg19rc-70-630) - 3 differences, the largest is module efficiency - [Trina Solar TSM-NEG19RC.70-620 vs Trina Solar TSM-NEG19RC.70-625](https://comparepv.com/compare/trina-solar-tsm-neg19rc-70-620/trina-solar-tsm-neg19rc-70-625) - The same specification on paper - [Trina Solar TSM-NEG19RC.70-620 vs Trina Solar TSM-NEG19RC.70-615](https://comparepv.com/compare/trina-solar-tsm-neg19rc-70-620/trina-solar-tsm-neg19rc-70-615) - One difference: module efficiency - [Trina Solar TSM-NEG19RC.70-620 vs Trina Solar TSM-NEG21C.20Q-760](https://comparepv.com/compare/trina-solar-tsm-neg19rc-70-620/trina-solar-tsm-neg21c-20q-760) - 14 differences, the largest is module efficiency - [Trina Solar TSM-NEG19RC.70-620 vs Trina Solar TSM-NEG21C.20Q-755](https://comparepv.com/compare/trina-solar-tsm-neg19rc-70-620/trina-solar-tsm-neg21c-20q-755) - 14 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/trina-solar-tsm-neg19rc-70-620/trina-solar-tsm-neg19rc-70-640 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.