--- title: "Suntech STP730S-D66-Nsh+ 730W Solar Panel - Specs & Review | ComparePV" description: "Suntech STP730S-D66-Nsh+ 730W solar panel. Specs: 23.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/suntech-stp730s-d66-nsh" updated: 2026-09-11 --- # Suntech STP730S-D66-Nsh+ Efficiency leader, no clear weak spot 420 panels in the segment TOPCon 700-750 W ## Identity - **Manufacturer:** Suntech - **Model:** STP730S-D66-Nsh+ - **Series:** Ultra T 2.0 - **Rated power:** 730 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 700-750 W (420 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 730 W | 715 W | Strong - top 11% | | | Module efficiency | 23.50% | 23.00% | Strong - top 10% | 716 | | Power density | 235.0 | 230.2 | Strong - top 11% | 800 | | Temperature coefficient | -0.280 | -0.290 | Strong - top 11% | 1,309 | | Weight (kg) | 37.5 kg | 38.0 kg | Strong - top 24% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.50% | 23.00% | Strong - top 10% | 716 | | Power density | 235.0 | 230.2 | Strong - top 11% | 800 | | Temperature coefficient | -0.280 | -0.290 | Strong - top 11% | 1,309 | | Weight per kWp | 51.4 | 52.9 | Strong - top 24% | 4,748 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **23.50% module efficiency** - Top 10% of the TOPCon 700-750 W segment, against a median of 23.00%. - **235.0 watts per square metre** - Top 11% of the TOPCon 700-750 W segment, against a median of 230.2. - **-0.280 %/°C temperature coefficient** - Top 11% of the TOPCon 700-750 W segment, against a median of -0.290. - **Best for:** Commercial and utility-scale. ## Specification ### Electrical - **Rated power (Pmax):** 730 W - **Efficiency:** 23.50 % - **Voltage at Pmax (Vmp):** 41.27 V - **Current at Pmax (Imp):** 17.70 A - **Open-circuit voltage (Voc):** 49.66 V - **Short-circuit current (Isc):** 18.54 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.280 %/degC - **Temperature coefficient of Voc:** -0.240 %/degC - **Temperature coefficient of Isc:** 0.043 %/degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 132 - **Bifacial:** yes ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 33 mm - **Weight:** 37.5 kg - **Area:** 3.11 m2 - **Power density:** 235.0 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 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:** 638 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 716 of 14005 | | Power density | 800 of 14005 | | Temperature coefficient | 1309 of 14005 | | Weight | 4748 of 14005 | | Warranty | 21 of 14005 | ## About this series Ultra T 2.0 is a PV module series built for investors who care about more than just efficiency, valuing the visual appeal of an installation on a roof or facade just as much. The **N-type TOPCon technology** in a half-cell layout reduces resistive losses and keeps energy output stable even under elevated module operating temperatures. The distinctive, uniformly black appearance of the components allows the panels to blend harmoniously into building architecture, making this series a natural choice for residential projects where aesthetics matter as much as technical parameters. A **double-glass construction** with an anti-reflective coated front glass, combined with **multi-busbar technology**, improves light utilization and current collection, translating into greater long-term reliability. The series also stands out for its resistance to demanding environmental conditions, backed by certifications for salt mist, ammonia, and dust and sand resistance, making it a solid choice for agricultural and coastal sites. A durable anodized aluminum frame together with certified **load-bearing capability** ensures mechanical stability even in regions with heavy snow and wind loads, while the long-term power warranty provides confidence in the investment for decades to come. ## Notable figures - At 23.5% efficiency, this panel is on par with typical \*\*TOPCon 700-750W\*\* modules - Power density of 235.0 W/m² packs 4.8 W/m² more into the same footprint vs \*\*TOPCon 700-750W\*\* median (230.2 W/m²) - Temperature coefficient of -0.28%/°C matches the \*\*TOPCon 700-750W\*\* median - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces - In the top 5% for efficiency among all TOPCon panels ## Questions ### What is the maximum power output of the Suntech Ultra T 2.0 panel? The Ultra T 2.0 series reaches a maximum power output of up to 735 Wp, placing it among the highest-output monocrystalline modules currently available. This high output comes from large-format half-cut TOPCon cells combined with multi-busbar technology, which reduce current losses and improve energy harvesting across the panel surface. As a result, fewer modules are needed to reach a given system size, lowering mounting and racking costs. ### How does the N-type TOPCon technology in the Ultra T 2.0 differ from older PERC panels? TOPCon is an N-type cell technology that, unlike common PERC cells, is not boron-doped, so Ultra T 2.0 panels experience virtually no LID-related power loss in the first months of operation. A lower temperature coefficient (around -0.29%/°C) means smaller output drops on hot days compared to standard PERC modules. In practice, this results in higher and more stable annual energy yield. ### Do Ultra T 2.0 panels perform well in summer, at high roof temperatures? Yes, thanks to TOPCon technology, Ultra T 2.0 panels have a low power temperature coefficient (around -0.29%/°C), meaning they lose less output than standard PERC panels as module temperature rises above 25°C. This matters especially in summer, when roof surface temperatures can exceed 60-70°C. As a result, the system maintains higher energy output on the hottest days, when demand for electricity is typically highest. ### What warranty comes with the Suntech Ultra T 2.0 panels? The manufacturer provides a 25-year product warranty along with a 30-year linear power output warranty. This means that after 30 years of operation, the panel should still generate no less than about 87% of its original rated power, with less than 1% degradation in the first year alone. This long warranty period makes the Ultra T 2.0 a solid choice for investors planning installations designed to last for decades without module replacement. ### Are Ultra T 2.0 panels suitable for coastal installations or agricultural buildings? Yes, the Ultra T 2.0 series holds certifications for salt mist, ammonia, and dust/sand resistance, confirming its durability under harsh environmental conditions. Salt mist resistance is essential for coastal installations, where salty air accelerates component corrosion, while ammonia resistance matters for installations on livestock buildings and other agricultural sites. This makes the panels a safe choice for both types of applications. ### Can Ultra T 2.0 panels withstand heavy snow and strong wind loads? Yes, Ultra T 2.0 modules feature a sturdy anodized aluminum frame with certified load ratings, confirming their mechanical stability under strong wind and heavy snow loads. The double-glass construction further increases panel rigidity and resistance to deflection compared to standard backsheet modules. These parameters matter when designing installations in mountainous regions or areas with high snow load standards, where choosing the right mounting structure is critical. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/STPXXXS-D66-Nsh-57919a42a356.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | -50 W, lighter, +1.7 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | -30 W, lighter, +1.5 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | -35 W, lighter, +1.4 pp | | [AIKO AIKO-A690-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a690-mae78dw) | 690 W | -40 W, lighter, +1.2 pp | | [AIKO AIKO-A685-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a685-mae78dw) | 685 W | -45 W, lighter, +1.0 pp | | [Trina Solar TSM-NEG21C.20Q-760](https://comparepv.com/panel/trina-solar-tsm-neg21c-20q-760) | 760 W | +30 W, cooler, +1.0 pp | | [AIKO AIKO-A680-MAH78Dw](https://comparepv.com/panel/aiko-aiko-a680-mah78dw) | 680 W | -50 W, lighter, +0.8 pp | | [Gokin GK-4-78HGBD-780M](https://comparepv.com/panel/gokin-gk-4-78hgbd-780m) | 780 W | +50 W, cooler, +0.8 pp | | [AIKO AIKO-A780-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a780-grh78dw) | 780 W | +50 W, heavier, +0.8 pp | | [Suntech STP650S-D66/Pmh+](https://comparepv.com/panel/wuxi-suntech-power-co-ltd-stp650s-d66-pmh) | 650 W | -80 W, hotter, -2.6 pp | | [Suntech STP655S-D66/Wmh](https://comparepv.com/panel/suntech-stp655s-d66-wmh) | 655 W | -75 W, hotter, -2.4 pp | | [Suntech STP660S-D66/Wmh](https://comparepv.com/panel/suntech-stp660s-d66-wmh) | 660 W | -70 W, hotter, -2.3 pp | | [Suntech STP665S-D66/Wmh](https://comparepv.com/panel/suntech-stp665s-d66-wmh) | 665 W | -65 W, hotter, -2.1 pp | | [Suntech STP670S-D66/Wmh](https://comparepv.com/panel/suntech-stp670s-d66-wmh) | 670 W | -60 W, hotter, -1.9 pp | | [Suntech STP675S-D66/Wmh](https://comparepv.com/panel/suntech-stp675s-d66-wmh) | 675 W | -55 W, hotter, -1.8 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +75 W, heavier, +1.6 pp | --- Source: https://comparepv.com/panel/suntech-stp730s-d66-nsh 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.