--- title: "Trina Solar TSM-DE09R.08-420 vs Trina Solar TSM-DE09R-415 - Solar Panel Comparison | ComparePV" description: "Compare Trina Solar TSM-DE09R.08-420 vs Trina Solar TSM-DE09R-415 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-de09r-08-420/trina-solar-tsm-de09r-415" updated: 2026-09-11 --- # Trina Solar TSM-DE09R.08-420 vs Trina Solar TSM-DE09R-415 DE09R.08-420 leads on the differences that matter The largest is product warranty: 3 yrs longer. 17 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Trina Solar TSM-DE09R.08-420](https://comparepv.com/panel/trina-solar-tsm-de09r-08-420) | [Trina Solar TSM-DE09R-415](https://comparepv.com/panel/trina-solar-tsm-de09r-415) | | Manufacturer | Trina Solar | Trina Solar | | Power | 420 Wp | 415 Wp | | Efficiency | 21.00 % | 20.80 % | | Technology | PERC | PERC | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | DE09R.08-420 | DE09R-415 | Difference | | --- | --- | --- | --- | | Product warranty | 15 yrs | 12 yrs | +3 yrs for DE09R.08-420 | | Module efficiency | 21.00 % | 20.80 % | +0.20 pp for DE09R.08-420 | ## Every compared parameter | Parameter | DE09R.08-420 | DE09R-415 | | --- | --- | --- | | Rated power | 420 Wp | 415 Wp | | Module efficiency | 21.00 % | 20.80 % | | Power density | 210.2 Wp/m² | 207.7 Wp/m² | | Open-circuit voltage | 50.10 V | 50.00 V | | Voltage at max power | 42.00 V | 41.70 V | | Short-circuit current | 10.58 A | 10.55 A | | Current at max power | 10.01 A | 9.94 A | | Temperature coefficient | -0.340 %/°C | -0.340 %/°C | | Dimensions | 1762x1134x30 mm | 1762x1134x30 mm | | Module area | 1.998 m² | 1.998 m² | | Weight | 21.8 kg | 21.8 kg | | Weight per kWp | 51.9 kg/kWp | 52.5 kg/kWp | | Product warranty | 15 yrs | 12 yrs | | Performance warranty | 25 yrs | 25 yrs | | Annual degradation | 0.55 %/yr | 0.55 %/yr | | Cell technology | PERC | PERC | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 144 | 144 | | Bifacial | No | No | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year Same temp coeff. for both panels (-0.340 %/°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, DE09R.08-420:** 13,612 kWh - **Cumulative output, DE09R-415:** 13,450 kWh - **Gap:** 162 kWh ## Output when hot | Condition | Cell temperature | DE09R.08-420 | DE09R-415 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 420 W | 415 W | 100.0% of rated power | | Cool, bright day | 40 °C | 399 W | 394 W | 94.9% of rated power | | Typical summer roof | 55 °C | 377 W | 373 W | 89.8% of rated power | | Hot roof | 70 °C | 356 W | 352 W | 84.7% of rated power | ## Against the whole database | Measure | DE09R.08-420 | DE09R-415 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #9,758 | #10,457 | 14,005 | DE09R.08-420 leads by 699 places | | Power density | #9,728 | #10,546 | 14,005 | DE09R.08-420 leads by 818 places | | Heat behaviour | #8,778 | #8,778 | 14,005 | Tied - the same position in the database | | Weight | #5,315 | #6,144 | 14,005 | DE09R.08-420 leads by 829 places | | Warranty | #9,798 | #9,798 | 14,005 | Tied - the same position in the database | | Overall | #11,162 | #11,736 | 14,005 | DE09R.08-420 leads by 574 places | ## Questions ### Which panel is better: Trina Solar TSM-DE09R.08-420 or Trina Solar TSM-DE09R-415? According to our database: **Trina Solar TSM-DE09R.08-420** has higher module efficiency (**21.00%** vs **20.80%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Trina Solar TSM-DE09R.08-420 and Trina Solar TSM-DE09R-415? **Trina Solar TSM-DE09R.08-420** has a module efficiency of **21.00%**, while **Trina Solar TSM-DE09R-415** is **20.80%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Trina Solar TSM-DE09R.08-420 use vs Trina Solar TSM-DE09R-415? **Trina Solar TSM-DE09R.08-420** uses **PERC** cells; **Trina Solar TSM-DE09R-415** uses **PERC**. 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-DE09R.08-420 and Trina Solar TSM-DE09R-415? **Trina Solar TSM-DE09R.08-420** has a **25 years** power warranty; **Trina Solar TSM-DE09R-415** has a **25 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. ## Related comparisons - [Trina Solar TSM-DE09R.08-420 vs Trina Solar TSM-DE09R-435](https://comparepv.com/compare/trina-solar-tsm-de09r-08-420/trina-solar-tsm-de09r-435) - 4 differences, the largest is module efficiency - [Trina Solar TSM-DE09R.08-420 vs Trina Solar TSM-DE09R.08-435](https://comparepv.com/compare/trina-solar-tsm-de09r-08-420/trina-solar-tsm-de09r-08-435) - 3 differences, the largest is module efficiency - [Trina Solar TSM-DE09R.08-420 vs Trina Solar TSM-DE09R-430](https://comparepv.com/compare/trina-solar-tsm-de09r-08-420/trina-solar-tsm-de09r-430) - 4 differences, the largest is module efficiency - [Trina Solar TSM-DE09R.08-420 vs Trina Solar TSM-DE09R.08-430](https://comparepv.com/compare/trina-solar-tsm-de09r-08-420/trina-solar-tsm-de09r-08-430) - 3 differences, the largest is module efficiency - [Trina Solar TSM-DE09R.08-420 vs Trina Solar TSM-DE09R-425](https://comparepv.com/compare/trina-solar-tsm-de09r-08-420/trina-solar-tsm-de09r-425) - 2 differences, the largest is product warranty - [Trina Solar TSM-DE09R.08-420 vs Trina Solar TSM-DE09R.08-425](https://comparepv.com/compare/trina-solar-tsm-de09r-08-420/trina-solar-tsm-de09r-08-425) - One difference: module efficiency --- Source: https://comparepv.com/compare/trina-solar-tsm-de09r-08-420/trina-solar-tsm-de09r-415 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.