--- title: "Ulica Solar UL-660M-132DG vs Ulica Solar UL-670M-132DG - Solar Panel Comparison | ComparePV" description: "Compare Ulica Solar UL-660M-132DG vs Ulica Solar UL-670M-132DG 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-ul-660m-132dg/ulica-solar-ul-670m-132dg" updated: 2026-09-11 --- # Ulica Solar UL-660M-132DG vs Ulica Solar UL-670M-132DG 670M-132DG leads on the differences that matter The largest is module efficiency: 0.32 pp more efficient. 16 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Ulica Solar UL-660M-132DG](https://comparepv.com/panel/ulica-solar-ul-660m-132dg) | [Ulica Solar UL-670M-132DG](https://comparepv.com/panel/ulica-solar-ul-670m-132dg) | | Manufacturer | Ulica Solar | Ulica Solar | | Power | 660 Wp | 670 Wp | | Efficiency | 21.25 % | 21.57 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 660M-132DG | 670M-132DG | Difference | | --- | --- | --- | --- | | Module efficiency | 21.25 % | 21.57 % | +0.32 pp for 670M-132DG | | Power density | 212.5 Wp/m² | 215.7 Wp/m² | +3.2 Wp/m² for 670M-132DG | | Rated power | 660 Wp | 670 Wp | +10 W for 670M-132DG | ## Every compared parameter | Parameter | 660M-132DG | 670M-132DG | | --- | --- | --- | | Rated power | 660 Wp | 670 Wp | | Module efficiency | 21.25 % | 21.57 % | | Power density | 212.5 Wp/m² | 215.7 Wp/m² | | Open-circuit voltage | 45.70 V | 45.80 V | | Voltage at max power | 38.20 V | 38.40 V | | Short-circuit current | 18.44 A | 18.62 A | | Current at max power | 17.28 A | 17.45 A | | Temperature coefficient | -0.340 %/°C | -0.340 %/°C | | Dimensions | 2384x1303x35 mm | 2384x1303x35 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 37.3 kg | 37.3 kg | | Weight per kWp | 56.5 kg/kWp | 55.7 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 (-0.340 %/°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, 660M-132DG:** 22,144 kWh - **Cumulative output, 670M-132DG:** 22,480 kWh - **Gap:** 336 kWh ## Output when hot | Condition | Cell temperature | 660M-132DG | 670M-132DG | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 660 W | 670 W | 100.0% of rated power | | Cool, bright day | 40 °C | 626 W | 636 W | 94.9% of rated power | | Typical summer roof | 55 °C | 593 W | 602 W | 89.8% of rated power | | Hot roof | 70 °C | 559 W | 567 W | 84.7% of rated power | ## Against the whole database | Measure | 660M-132DG | 670M-132DG | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #8,904 | #7,734 | 14,005 | 670M-132DG leads by 1,170 places | | Power density | #8,959 | #7,644 | 14,005 | 670M-132DG leads by 1,315 places | | Heat behaviour | #8,778 | #8,778 | 14,005 | Tied - the same position in the database | | Weight | #10,694 | #10,048 | 14,005 | 670M-132DG leads by 646 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #3,163 | #2,486 | 14,005 | 670M-132DG leads by 677 places | ## Questions ### Which panel is better: Ulica Solar UL-660M-132DG or Ulica Solar UL-670M-132DG? According to our database: **Ulica Solar UL-670M-132DG** has higher module efficiency (**21.57%** vs **21.25%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Ulica Solar UL-660M-132DG and Ulica Solar UL-670M-132DG? **Ulica Solar UL-660M-132DG** has a module efficiency of **21.25%**, while **Ulica Solar UL-670M-132DG** is **21.57%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Ulica Solar UL-660M-132DG use vs Ulica Solar UL-670M-132DG? **Ulica Solar UL-660M-132DG** uses **TOPCon** cells; **Ulica Solar UL-670M-132DG** 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 UL-660M-132DG and Ulica Solar UL-670M-132DG? **Ulica Solar UL-660M-132DG** has a **30 years** power warranty; **Ulica Solar UL-670M-132DG** 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 UL-660M-132DG and Ulica Solar UL-670M-132DG bifacial panels? Both **Ulica Solar UL-660M-132DG** and **Ulica Solar UL-670M-132DG** 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 UL-660M-132DG vs Ulica Solar UL-665M-132DG](https://comparepv.com/compare/ulica-solar-ul-660m-132dg/ulica-solar-ul-665m-132dg) - The same specification on paper - [Ulica Solar UL-660M-132DG vs Ulica Solar UL-655M-132DG](https://comparepv.com/compare/ulica-solar-ul-660m-132dg/ulica-solar-ul-655m-132dg) - The same specification on paper - [Ulica Solar UL-660M-132DG vs Ulica Solar UL-715M-132DGN](https://comparepv.com/compare/ulica-solar-ul-660m-132dg/ulica-solar-ul-715m-132dgn) - 9 differences, the largest is module efficiency - [Ulica Solar UL-660M-132DG vs Ulica Solar UL-710M-132DGN](https://comparepv.com/compare/ulica-solar-ul-660m-132dg/ulica-solar-ul-710m-132dgn) - 9 differences, the largest is module efficiency - [Ulica Solar UL-660M-132DG vs Ulica Solar UL-705M-132DGN](https://comparepv.com/compare/ulica-solar-ul-660m-132dg/ulica-solar-ul-705m-132dgn) - 9 differences, the largest is module efficiency - [Ulica Solar UL-660M-132DG vs Ulica Solar UL-700M-132DGN](https://comparepv.com/compare/ulica-solar-ul-660m-132dg/ulica-solar-ul-700m-132dgn) - 9 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/ulica-solar-ul-660m-132dg/ulica-solar-ul-670m-132dg 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.