--- title: "Ulica Solar TSM156-9-620BNDG vs Ulica Solar TSM156-9-625BNDG - Solar Panel Comparison | ComparePV" description: "Compare Ulica Solar TSM156-9-620BNDG vs Ulica Solar TSM156-9-625BNDG side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/ulica-solar-tsm156-9-620bndg/ulica-solar-tsm156-9-625bndg" updated: 2026-09-11 --- # Ulica Solar TSM156-9-620BNDG vs Ulica Solar TSM156-9-625BNDG 625BNDG leads on the differences that matter The largest is module efficiency: 0.20 pp more efficient. 18 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Ulica Solar TSM156-9-620BNDG](https://comparepv.com/panel/ulica-solar-tsm156-9-620bndg) | [Ulica Solar TSM156-9-625BNDG](https://comparepv.com/panel/ulica-solar-tsm156-9-625bndg) | | Manufacturer | Ulica Solar | Ulica Solar | | Power | 620 Wp | 625 Wp | | Efficiency | 22.20 % | 22.40 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 620BNDG | 625BNDG | Difference | | --- | --- | --- | --- | | Module efficiency | 22.20 % | 22.40 % | +0.20 pp for 625BNDG | ## Every compared parameter | Parameter | 620BNDG | 625BNDG | | --- | --- | --- | | Rated power | 620 Wp | 625 Wp | | Module efficiency | 22.20 % | 22.40 % | | Power density | 221.8 Wp/m² | 223.6 Wp/m² | | Open-circuit voltage | 55.82 V | 56.01 V | | Voltage at max power | 46.67 V | 46.82 V | | Short-circuit current | 14.16 A | 14.22 A | | Current at max power | 13.30 A | 13.36 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2465x1134x30 mm | 2465x1134x30 mm | | Module area | 2.795 m² | 2.795 m² | | Weight | 33.5 kg | 33.5 kg | | Weight per kWp | 54.0 kg/kWp | 53.6 kg/kWp | | Product warranty | 5 yrs | 5 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 | 156 | 156 | | 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, 620BNDG:** 20,802 kWh - **Cumulative output, 625BNDG:** 20,970 kWh - **Gap:** 168 kWh ## Output when hot | Condition | Cell temperature | 620BNDG | 625BNDG | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 620 W | 625 W | 100.0% of rated power | | Cool, bright day | 40 °C | 593 W | 598 W | 95.7% of rated power | | Typical summer roof | 55 °C | 566 W | 571 W | 91.3% of rated power | | Hot roof | 70 °C | 539 W | 543 W | 87.0% of rated power | ## Against the whole database | Measure | 620BNDG | 625BNDG | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #5,817 | #4,774 | 14,005 | 625BNDG leads by 1,043 places | | Power density | #5,869 | #4,955 | 14,005 | 625BNDG leads by 914 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #8,248 | #7,601 | 14,005 | 625BNDG leads by 647 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #4,849 | #4,451 | 14,005 | 625BNDG leads by 398 places | ## Questions ### Which panel is better: Ulica Solar TSM156-9-620BNDG or Ulica Solar TSM156-9-625BNDG? According to our database: **Ulica Solar TSM156-9-625BNDG** has higher module efficiency (**22.40%** vs **22.20%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Ulica Solar TSM156-9-620BNDG and Ulica Solar TSM156-9-625BNDG? **Ulica Solar TSM156-9-620BNDG** has a module efficiency of **22.20%**, while **Ulica Solar TSM156-9-625BNDG** is **22.40%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Ulica Solar TSM156-9-620BNDG use vs Ulica Solar TSM156-9-625BNDG? **Ulica Solar TSM156-9-620BNDG** uses **TOPCon** cells; **Ulica Solar TSM156-9-625BNDG** 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 Ulica Solar TSM156-9-620BNDG and Ulica Solar TSM156-9-625BNDG? **Ulica Solar TSM156-9-620BNDG** has a **30 years** power warranty; **Ulica Solar TSM156-9-625BNDG** 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 Ulica Solar TSM156-9-620BNDG and Ulica Solar TSM156-9-625BNDG bifacial panels? Both **Ulica Solar TSM156-9-620BNDG** and **Ulica Solar TSM156-9-625BNDG** 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 - [Ulica Solar TSM156-9-620BNDG vs Ulica Solar TSM156-9-645BNDG](https://comparepv.com/compare/ulica-solar-tsm156-9-620bndg/ulica-solar-tsm156-9-645bndg) - 4 differences, the largest is module efficiency - [Ulica Solar TSM156-9-620BNDG vs Ulica Solar TSM156-9-640BNDG](https://comparepv.com/compare/ulica-solar-tsm156-9-620bndg/ulica-solar-tsm156-9-640bndg) - 3 differences, the largest is module efficiency - [Ulica Solar TSM156-9-620BNDG vs Ulica Solar TSM156-9-635BNDG](https://comparepv.com/compare/ulica-solar-tsm156-9-620bndg/ulica-solar-tsm156-9-635bndg) - 3 differences, the largest is module efficiency - [Ulica Solar TSM156-9-620BNDG vs Ulica Solar TSM156-9-630BNDG](https://comparepv.com/compare/ulica-solar-tsm156-9-620bndg/ulica-solar-tsm156-9-630bndg) - 3 differences, the largest is module efficiency - [Ulica Solar TSM156-9-620BNDG vs Ulica Solar UL-715M-132DGN](https://comparepv.com/compare/ulica-solar-tsm156-9-620bndg/ulica-solar-ul-715m-132dgn) - 12 differences, the largest is module efficiency - [Ulica Solar TSM156-9-620BNDG vs Ulica Solar UL-710M-132DGN](https://comparepv.com/compare/ulica-solar-tsm156-9-620bndg/ulica-solar-ul-710m-132dgn) - 12 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/ulica-solar-tsm156-9-620bndg/ulica-solar-tsm156-9-625bndg 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.