--- title: "DAS Solar DAS-DH156NA-635W vs DAS Solar DAS-DH156NA-645W - Solar Panel Comparison | ComparePV" description: "Compare DAS Solar DAS-DH156NA-635W vs DAS Solar DAS-DH156NA-645W side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/das-solar-das-dh156na-635w/das-solar-das-dh156na-645w" updated: 2026-09-11 --- # DAS Solar DAS-DH156NA-635W vs DAS Solar DAS-DH156NA-645W 645W leads on the differences that matter The largest is module efficiency: 0.40 pp more efficient. 15 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 | [DAS Solar DAS-DH156NA-635W](https://comparepv.com/panel/das-solar-das-dh156na-635w) | [DAS Solar DAS-DH156NA-645W](https://comparepv.com/panel/das-solar-das-dh156na-645w) | | Manufacturer | DAS Solar | DAS Solar | | Power | 635 Wp | 645 Wp | | Efficiency | 22.70 % | 23.10 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 635W | 645W | Difference | | --- | --- | --- | --- | | Module efficiency | 22.70 % | 23.10 % | +0.40 pp for 645W | | Power density | 227.2 Wp/m² | 230.7 Wp/m² | +3.6 Wp/m² for 645W | | Rated power | 635 Wp | 645 Wp | +10 W for 645W | ## Every compared parameter | Parameter | 635W | 645W | | --- | --- | --- | | Rated power | 635 Wp | 645 Wp | | Module efficiency | 22.70 % | 23.10 % | | Power density | 227.2 Wp/m² | 230.7 Wp/m² | | Open-circuit voltage | 56.01 V | 56.36 V | | Voltage at max power | 46.42 V | 46.78 V | | Short-circuit current | 14.42 A | 14.53 A | | Current at max power | 13.68 A | 13.79 A | | Temperature coefficient | -0.300 %/°C | -0.300 %/°C | | Dimensions | 2465x1134x30 mm | 2465x1134x30 mm | | Module area | 2.795 m² | 2.795 m² | | Weight | 34.3 kg | 34.3 kg | | Weight per kWp | 54.0 kg/kWp | 53.2 kg/kWp | | Product warranty | 15 yrs | 15 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 | - | - | | 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 (-0.300 %/°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, 635W:** 21,306 kWh - **Cumulative output, 645W:** 21,641 kWh - **Gap:** 335 kWh ## Output when hot | Condition | Cell temperature | 635W | 645W | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 635 W | 645 W | 100.0% of rated power | | Cool, bright day | 40 °C | 606 W | 616 W | 95.5% of rated power | | Typical summer roof | 55 °C | 578 W | 587 W | 91.0% of rated power | | Hot roof | 70 °C | 549 W | 558 W | 86.5% of rated power | ## Against the whole database | Measure | 635W | 645W | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #3,307 | #1,570 | 14,005 | 645W leads by 1,737 places | | Power density | #3,252 | #1,654 | 14,005 | 645W leads by 1,598 places | | Heat behaviour | #6,093 | #6,093 | 14,005 | Tied - the same position in the database | | Weight | #8,218 | #7,008 | 14,005 | 645W leads by 1,210 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #1,931 | #1,496 | 14,005 | 645W leads by 435 places | ## Questions ### Which panel is better: DAS Solar DAS-DH156NA-635W or DAS Solar DAS-DH156NA-645W? According to our database: **DAS Solar DAS-DH156NA-**645 W**** has higher module efficiency (**23.10%** vs **22.70%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of DAS Solar DAS-DH156NA-635W and DAS Solar DAS-DH156NA-645W? **DAS Solar DAS-DH156NA-**635 W**** has a module efficiency of **22.70%**, while **DAS Solar DAS-DH156NA-**645 W**** is **23.10%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does DAS Solar DAS-DH156NA-635W use vs DAS Solar DAS-DH156NA-645W? **DAS Solar DAS-DH156NA-**635 W**** uses **TOPCon** cells; **DAS Solar DAS-DH156NA-**645 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 DAS Solar DAS-DH156NA-635W and DAS Solar DAS-DH156NA-645W? **DAS Solar DAS-DH156NA-**635 W**** has a **30 years** power warranty; **DAS Solar DAS-DH156NA-**645 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 DAS Solar DAS-DH156NA-635W and DAS Solar DAS-DH156NA-645W bifacial panels? Both **DAS Solar DAS-DH156NA-**635 W**** and **DAS Solar DAS-DH156NA-**645 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 - [DAS Solar DAS-DH156NA-635W vs DAS Solar DAS-DH156NA-650W](https://comparepv.com/compare/das-solar-das-dh156na-635w/das-solar-das-dh156na-650w) - 3 differences, the largest is module efficiency - [DAS Solar DAS-DH156NA-635W vs DAS Solar DAS-DH156NA-640W](https://comparepv.com/compare/das-solar-das-dh156na-635w/das-solar-das-dh156na-640w) - One difference: module efficiency - [DAS Solar DAS-DH156NA-635W vs DAS Solar DAS-DH156NA-630W](https://comparepv.com/compare/das-solar-das-dh156na-635w/das-solar-das-dh156na-630w) - One difference: module efficiency - [DAS Solar DAS-DH156NA-635W vs DAS Solar DAS-DH156NA-625W](https://comparepv.com/compare/das-solar-das-dh156na-635w/das-solar-das-dh156na-625w) - 3 differences, the largest is module efficiency - [DAS Solar DAS-DH156NA-635W vs DAS Solar DAS-DH132NC-715](https://comparepv.com/compare/das-solar-das-dh156na-635w/das-solar-das-dh132nc-715) - 11 differences, the largest is rated power - [DAS Solar DAS-DH156NA-635W vs DAS Solar DAS-DH132NC-710](https://comparepv.com/compare/das-solar-das-dh156na-635w/das-solar-das-dh132nc-710) - 10 differences, the largest is rated power --- Source: https://comparepv.com/compare/das-solar-das-dh156na-635w/das-solar-das-dh156na-645w 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.