--- title: "Ulica Solar TSM156-9-620BNDG 620W Solar Panel - Specs & Review | ComparePV" description: "Ulica Solar TSM156-9-620BNDG 620W solar panel. Specs: 22.20% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ulica-solar-tsm156-9-620bndg" updated: 2026-09-11 --- # Ulica Solar TSM156-9-620BNDG Middle of its segment, needs the roof space 1,086 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** Ulica Solar - **Model:** TSM156-9-620BNDG - **Series:** TSM156-9-620-645BNDG - **Rated power:** 620 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 600-650 W (1086 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 620 W | 620 W | Typical | | | Module efficiency | 22.20% | 22.80% | Weak - bottom 12% | 5,817 | | Power density | 221.8 | 227.7 | Weak - bottom 9% | 5,869 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 33.5 kg | 32.7 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.20% | 22.80% | Weak - bottom 12% | 5,817 | | Power density | 221.8 | 227.7 | Weak - bottom 9% | 5,869 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 54.0 | 53.1 | Typical | 8,248 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **221.8 watts per square metre** - Bottom 9% of the TOPCon 600-650 W segment, against a median of 227.7. Ranked 5,869th in the whole database. - **22.20% module efficiency** - Bottom 12% of the TOPCon 600-650 W segment, against a median of 22.80%. - **Best for:** Commercial, utility-scale, hot-climate and cold-climate. - **Not ideal for:** Roofs where every square metre has to count and tight roof space. ## Specification ### Electrical - **Rated power (Pmax):** 620 W - **Efficiency:** 22.20 % - **Voltage at Pmax (Vmp):** 46.67 V - **Current at Pmax (Imp):** 13.30 A - **Open-circuit voltage (Voc):** 55.82 V - **Short-circuit current (Isc):** 14.16 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.046 %/degC - **NOCT:** 44 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 156 - **Bifacial:** yes - **Bifacial gain:** 10.00 ### Physical - **Length:** 2465 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 33.5 kg - **Area:** 2.80 m2 - **Power density:** 221.8 Wp/m2 ### Warranty and degradation - **Product warranty:** 5 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 542 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 5817 of 14005 | | Power density | 5869 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 8248 of 14005 | | Warranty | 21 of 14005 | ## About this series The Ulica Solar TSM156-9-620-645BNDG series is designed for installations where maximizing energy yield per square meter and stable performance in challenging conditions are paramount. These are **bifacial** modules that can actively utilize reflected light from the ground, allowing for increased energy production without expanding the structure. The use of **N-type silicon cells with TOPCon technology** results in lower losses over time and better performance at high temperatures, which is particularly beneficial on roofs and solar farms during the summer months. The **double glass** variant enhances resistance to moisture, microcracks, and accelerated aging, making the series suitable for long-term projects and areas with strong winds and heavy snow loads. An additional advantage is the **long, multi-year power warranty**, which is important for the bankability of the investment. This is a sensible choice for PV farms, warehouses, and industrial buildings, as well as for installations on roofs with good sunlight or reflective surfaces, where single-sided modules may not provide the desired energy yield. ## Notable figures - At 22.2% efficiency, this panel is 0.6pp below the \*\*TOPCon 600-650W\*\* median of 22.8% - 221.8 W/m² power density is 5.9 W/m² below \*\*TOPCon 600-650W\*\* median (227.7 W/m²) - requires larger installation area - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 600-650W\*\* panels - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof - #5817 for efficiency, #2165 for temperature performance out of 14005 panels ## Questions ### What is the maximum power output of the Ulica Solar TSM156-9-620-645BNDG series? The series ranges from 620 to 645 Wp, depending on the binning class of the N-type TOPCon cells used in a given unit. This high per-module power output means fewer panels are needed to reach a target system size, reducing costs for mounting structures, cabling, and installation labor, especially in large-scale farm and industrial projects. ### What is N-type TOPCon technology and why is it used in this series? TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell technology that reduces recombination losses, giving the module lower first-year and long-term degradation compared to conventional P-type PERC cells. N-type cells also perform better at high temperatures, which translates into real energy gains during summer on rooftops and PV farms exposed to intense sunlight. ### How do the bifacial TSM156-9-620-645BNDG panels differ from standard one-sided modules? Bifacial modules have active cells on both sides and can generate additional energy from diffuse and reflected light reaching the rear side of the panel. In practice, this means higher energy yield without enlarging the array footprint, especially on light-colored roofs, gravel, concrete, or snow. The double glass construction also protects the rear side from moisture and mechanical damage. ### What warranty applies to the Ulica Solar TSM156-9-620-645BNDG panels? The manufacturer provides a 5-year product warranty covering material and workmanship defects, plus a 30-year linear power warranty. This power warranty period is now standard for N-type TOPCon modules and matters when assessing project bankability, since it allows long-term revenue from the installation to be forecast with confidence. ### Are the TSM156-9-620-645BNDG panels suitable for large warehouse roofs and PV farms? Yes, that is one of the main use cases for this series. The high per-module power output of up to 645 Wp, a double glass build resistant to snow and wind loads, and bifacial technology make it well suited for large warehouse and industrial roofs as well as ground-mount PV farms, where maximizing energy yield per square meter is a priority. ### Is Ulica Solar a Tier 1 manufacturer, and does that matter when choosing panels? Ulica Solar, based in China, is not currently on the Bloomberg NEF Tier 1 list, which does not necessarily equate to lower product quality. The Tier classification mainly reflects the scale of bank financing available to a manufacturer, not technical module performance. When choosing panels, it's better to focus on actual specifications, such as cell technology and warranty length, rather than the Tier category alone. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/tsm156-9-620-645bndg-iec1500v-30mm-2024h1-2-en-1-ad9bfbff7632.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +30 W, lighter, +3.0 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +2.8 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +50 W, lighter, +2.6 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +50 W, lighter, +2.6 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +2.6 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +50 W, cooler, +2.6 pp | | [Ulica Solar AU590-39V-MH](https://comparepv.com/panel/ulica-solar-au590-39v-mh) | 590 W | -30 W, lighter, -1.1 pp | | [Ulica Solar AU595-39V-MH](https://comparepv.com/panel/ulica-solar-au595-39v-mh) | 595 W | -25 W, lighter, -0.9 pp | | [Ulica Solar AU600-39V-MH](https://comparepv.com/panel/ulica-solar-au600-39v-mh) | 600 W | -20 W, lighter, -0.7 pp | | [Ulica Solar AU605-39V-MH](https://comparepv.com/panel/ulica-solar-au605-39v-mh) | 605 W | -15 W, lighter, -0.6 pp | | [Ulica Solar AU610-39V-MH](https://comparepv.com/panel/ulica-solar-au610-39v-mh) | 610 W | Hotter, lighter, -0.4 pp | | [Ulica Solar AU615-39V-MH](https://comparepv.com/panel/ulica-solar-au615-39v-mh) | 615 W | Hotter, lighter | | [Ulica Solar TSM156-9-625BNDG](https://comparepv.com/panel/ulica-solar-tsm156-9-625bndg) | 625 W | Very close match | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +60 W, lighter, +3.0 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +55 W, lighter, +2.8 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +80 W, cooler, +2.8 pp | --- Source: https://comparepv.com/panel/ulica-solar-tsm156-9-620bndg Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.