--- title: "Ulica Solar UL-655M-132HV vs Ulica Solar UL-665M-132HV - Solar Panel Comparison | ComparePV" description: "Compare Ulica Solar UL-655M-132HV vs Ulica Solar UL-665M-132HV 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-655m-132hv/ulica-solar-ul-665m-132hv" updated: 2026-09-11 --- # Ulica Solar UL-655M-132HV vs Ulica Solar UL-665M-132HV 665M-132HV 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-655M-132HV](https://comparepv.com/panel/ulica-solar-ul-655m-132hv) | [Ulica Solar UL-665M-132HV](https://comparepv.com/panel/ulica-solar-ul-665m-132hv) | | Manufacturer | Ulica Solar | Ulica Solar | | Power | 655 Wp | 665 Wp | | Efficiency | 21.09 % | 21.41 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 655M-132HV | 665M-132HV | Difference | | --- | --- | --- | --- | | Module efficiency | 21.09 % | 21.41 % | +0.32 pp for 665M-132HV | | Power density | 210.9 Wp/m² | 214.1 Wp/m² | +3.2 Wp/m² for 665M-132HV | | Rated power | 655 Wp | 665 Wp | +10 W for 665M-132HV | ## Every compared parameter | Parameter | 655M-132HV | 665M-132HV | | --- | --- | --- | | Rated power | 655 Wp | 665 Wp | | Module efficiency | 21.09 % | 21.41 % | | Power density | 210.9 Wp/m² | 214.1 Wp/m² | | Open-circuit voltage | 45.60 V | 45.80 V | | Voltage at max power | 38.10 V | 38.30 V | | Short-circuit current | 18.35 A | 18.53 A | | Current at max power | 17.19 A | 17.36 A | | Temperature coefficient | -0.340 %/°C | -0.340 %/°C | | Dimensions | 2384x1303x35 mm | 2384x1303x35 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 33.3 kg | 33.3 kg | | Weight per kWp | 50.8 kg/kWp | 50.1 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 25 yrs | 25 yrs | | Annual degradation | 0.55 %/yr | 0.55 %/yr | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 132 | | 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, 655M-132HV:** 21,228 kWh - **Cumulative output, 665M-132HV:** 21,552 kWh - **Gap:** 324 kWh ## Output when hot | Condition | Cell temperature | 655M-132HV | 665M-132HV | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 655 W | 665 W | 100.0% of rated power | | Cool, bright day | 40 °C | 622 W | 631 W | 94.9% of rated power | | Typical summer roof | 55 °C | 588 W | 597 W | 89.8% of rated power | | Hot roof | 70 °C | 555 W | 563 W | 84.7% of rated power | ## Against the whole database | Measure | 655M-132HV | 665M-132HV | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #9,519 | #8,280 | 14,005 | 665M-132HV leads by 1,239 places | | Power density | #9,459 | #8,250 | 14,005 | 665M-132HV leads by 1,209 places | | Heat behaviour | #8,778 | #8,778 | 14,005 | Tied - the same position in the database | | Weight | #4,239 | #3,587 | 14,005 | 665M-132HV leads by 652 places | | Warranty | #9,798 | #9,798 | 14,005 | Tied - the same position in the database | | Overall | #4,439 | #3,744 | 14,005 | 665M-132HV leads by 695 places | ## Questions ### Which panel is better: Ulica Solar UL-655M-132HV or Ulica Solar UL-665M-132HV? According to our database: **Ulica Solar UL-665M-132HV** has higher module efficiency (**21.41%** vs **21.09%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Ulica Solar UL-655M-132HV and Ulica Solar UL-665M-132HV? **Ulica Solar UL-655M-132HV** has a module efficiency of **21.09%**, while **Ulica Solar UL-665M-132HV** is **21.41%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Ulica Solar UL-655M-132HV use vs Ulica Solar UL-665M-132HV? **Ulica Solar UL-655M-132HV** uses **TOPCon** cells; **Ulica Solar UL-665M-132HV** 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-655M-132HV and Ulica Solar UL-665M-132HV? **Ulica Solar UL-655M-132HV** has a **25 years** power warranty; **Ulica Solar UL-665M-132HV** 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 - [Ulica Solar UL-655M-132HV vs Ulica Solar UL-670M-132HV](https://comparepv.com/compare/ulica-solar-ul-655m-132hv/ulica-solar-ul-670m-132hv) - 3 differences, the largest is module efficiency - [Ulica Solar UL-655M-132HV vs Ulica Solar UL-660M-132HV](https://comparepv.com/compare/ulica-solar-ul-655m-132hv/ulica-solar-ul-660m-132hv) - The same specification on paper - [Ulica Solar UL-655M-132HV vs Ulica Solar UL-715M-132DGN](https://comparepv.com/compare/ulica-solar-ul-655m-132hv/ulica-solar-ul-715m-132dgn) - 12 differences, the largest is module efficiency - [Ulica Solar UL-655M-132HV vs Ulica Solar UL-710M-132DGN](https://comparepv.com/compare/ulica-solar-ul-655m-132hv/ulica-solar-ul-710m-132dgn) - 12 differences, the largest is module efficiency - [Ulica Solar UL-655M-132HV vs Ulica Solar UL-705M-132DGN](https://comparepv.com/compare/ulica-solar-ul-655m-132hv/ulica-solar-ul-705m-132dgn) - 13 differences, the largest is module efficiency - [Ulica Solar UL-655M-132HV vs Ulica Solar UL-700M-132DGN](https://comparepv.com/compare/ulica-solar-ul-655m-132hv/ulica-solar-ul-700m-132dgn) - 13 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/ulica-solar-ul-655m-132hv/ulica-solar-ul-665m-132hv 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.