--- title: "Suntech STP420S-C54/Nshb Solar Panel: Specs & Datasheet | ComparePV" description: "Suntech STP420S-C54/Nshb solar panel. Specs: 21.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/wuxi-suntech-power-co-ltd-stp420s-c54-nshb" image: "https://comparepv.com/og/panel/wuxi-suntech-power-co-ltd-stp420s-c54-nshb.png" updated: 2026-09-11 --- # Suntech STP420S-C54/Nshb Middle of its segment, modest efficiency 1,220 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** Suntech - **Model:** STP420S-C54/Nshb - **Series:** Ultra V Pro mini (STPXXXS - C54/Nshb) - **Rated power:** 420 W - **Cell technology:** TOPCon ## How it compares Compared against segment TOPCon 400-450 W (1220 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 420 W | 435 W | Weak - bottom 16% | | | Module efficiency | 21.50% | 22.00% | Weak - bottom 17% | 8,022 | | Power density | 215.1 | 220.2 | Weak - bottom 18% | 7,946 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 | | Weight (kg) | 21.0 kg | 22.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.50% | 22.00% | Weak - bottom 17% | 8,022 | | Power density | 215.1 | 220.2 | Weak - bottom 18% | 7,946 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 | | Weight per kWp | 50.0 | 51.5 | Typical | 3,329 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **21.50% module efficiency** - Bottom 17% of the TOPCon 400-450 W segment, against a median of 22.00%. - **215.1 watts per square metre** - Bottom 18% of the TOPCon 400-450 W segment, against a median of 220.2. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 420 W - **Efficiency:** 21.50 % - **Voltage at Pmax (Vmp):** 31.96 V - **Current at Pmax (Imp):** 13.14 A - **Open-circuit voltage (Voc):** 38.46 V - **Short-circuit current (Isc):** 14.09 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:** 42 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 108 ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 21.0 kg - **Area:** 1.95 m2 - **Power density:** 215.1 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 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:** 367 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 8022 of 14129 | | Power density | 7946 of 14129 | | Temperature coefficient | 2220 of 14129 | | Weight | 3329 of 14129 | | Warranty | 21 of 14129 | ## About this series Suntech Ultra V Pro mini series (STPXXXS - C54/Nshb) are compact modules in the 108 half-cell format, designed for high power density on rooftops and aesthetic installations. The use of **N-type TOPCon** cells translates to more stable long-term performance and reduced degradation losses at the start of operation, helping maintain predictable energy production. The **half-cut** construction improves performance under partial shading - a real advantage in residential roofing, where shading from chimneys or trees is often unavoidable. The **ALL-Black** variant (Nshb designation) allows creating elegant, visually cohesive installations on modern roofs, without compromising technology. The series also stands out for its improved resistance to phenomena such as **PID**, thanks to carefully selected lamination materials, increasing reliability in demanding conditions. This is a good choice for homes, small businesses, and premium projects, where performance, durability, and appearance matter. ## Notable figures - At 21.5% efficiency, this panel is on par with typical \*\*TOPCon 400-450W\*\* modules - At 215.1 W/m², this panel generates 5.1 W/m² less per unit area than \*\*TOPCon 400-450W\*\* median (220.2 W/m²) - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 400-450W\*\* panels - At 21.0 kg, weight matches the \*\*TOPCon 400-450W\*\* median - Ranked #8022 out of 14129 panels for efficiency in the database ## Questions ### What is the maximum power output of the Suntech Ultra V Pro mini (STPXXXS - C54/Nshb) panel? Modules in the Ultra V Pro mini series reach a maximum power output of up to 420 Wp with a 108 half-cell format. This is a strong result for such a compact size, thanks to the use of N-type TOPCon cells with high efficiency. Exact power varies by model within the series, so check the label on the specific panel. ### How does the TOPCon technology in Suntech panels differ from older PERC cells? The N-type TOPCon cells used in the Ultra V Pro mini series show lower initial degradation and more stable long-term performance compared to P-type PERC cells. This results in higher and more predictable energy yield throughout the system's lifetime, an advantage that becomes especially noticeable after several years of operation. ### What is the warranty on Suntech Ultra V Pro mini solar panels? The manufacturer provides a 25-year product warranty and a 30-year power output warranty. Suntech is a Tier 1 manufacturer headquartered in China, which means a stable financial position and realistic prospects for service support throughout such a long warranty period - important for a long-term investment like a solar installation. ### Does the ALL-Black (Nshb) variant differ in specifications from the standard version of the panel? The ALL-Black variant, marked Nshb, differs mainly in appearance - a black frame and black backsheet create a uniform, aesthetic surface ideal for modern roofs. Electrical parameters, including up to 420 Wp power and TOPCon technology, remain the same as the standard version, so there is no need to trade performance for aesthetics. ### Do Ultra V Pro mini panels perform well under partial shading, e.g., from a chimney? Yes, the half-cut cell construction used in this series splits cells in half, reducing the power drop of the entire panel when part of it is shaded, for example by a chimney, antenna, or tree. This is a practical advantage for single-family homes, where the roof is rarely fully exposed to sunlight all day. ### Are Suntech Ultra V Pro mini panels resistant to potential induced degradation (PID)? Yes, the series features enhanced PID resistance thanks to carefully selected lamination materials. This reduces the risk of power loss caused by voltage potential differences between cells and the frame, which is important in installations with higher system voltage and contributes to greater reliability under demanding operating conditions. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/en-stp410-430s-c54-nshb-ac4e1bc158ff.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Just Solar JST-EDMH-(445-465)W-TD (465W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-465w-class) | 465 W | +45 W, hotter, +2.3 pp | | [Luxor Solar LX-465M/182R-96+ GG](https://comparepv.com/panel/luxor-lx-465m-182r-96-gg) | 465 W | +45 W, cooler, +2.3 pp | | [Maxeon SPR-MAX7-470](https://comparepv.com/panel/maxeon-spr-max7-470) | 470 W | +50 W, +2.2 pp, +10 yr warranty | | [AIKO AIKO-A470-MAH54Mb](https://comparepv.com/panel/aiko-aiko-a470-mah54mb) | 470 W | +50 W, cooler, +2.1 pp | | [AIKO AIKO-A460-MAH54Mb](https://comparepv.com/panel/aiko-shenzhen-aiko-digital-energy-technology-co-ltd-aiko-a460-mah54mb-1) | 460 W | +40 W, +2.1 pp | | [TCL Zhonghuan HSM-BD54-LA470](https://comparepv.com/panel/tcl-zhonghuan-hsm-bd54-la470) | 470 W | +50 W, cooler, +2.1 pp | | [Suntech STP390S-C54/Umh](https://comparepv.com/panel/suntech-stp390s-c54-umh) | 390 W | Hotter, -1.6 pp, -5 yr warranty | | [Suntech STP395S-C54/Umhm](https://comparepv.com/panel/wuxi-suntech-power-co-ltd-suntech-stp395s-c54-umhm) | 395 W | Hotter, -1.3 pp, -5 yr warranty | | [Suntech STP395S-C54/Umh](https://comparepv.com/panel/suntech-stp395s-c54-umh) | 395 W | Hotter, -1.3 pp, -5 yr warranty | | [Suntech STP400S-C54/Umhm](https://comparepv.com/panel/wuxi-suntech-power-co-ltd-suntech-stp400s-c54-umhm) | 400 W | Hotter, -1.0 pp, -5 yr warranty | | [Suntech STP400S-C54/Umh](https://comparepv.com/panel/suntech-stp400s-c54-umh) | 400 W | Hotter, -1.0 pp, -5 yr warranty | | [Suntech STP405S-C54/Umhm](https://comparepv.com/panel/wuxi-suntech-power-co-ltd-suntech-stp405s-c54-umhm) | 405 W | Hotter, -0.8 pp, -5 yr warranty | | [Suntech STP405S-C54/Umh](https://comparepv.com/panel/suntech-stp405s-c54-umh) | 405 W | Hotter, -0.8 pp, -5 yr warranty | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +90 W, cooler, +3.5 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +75 W, cooler, +3.3 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +85 W, cooler, +3.2 pp | --- Source: https://comparepv.com/panel/wuxi-suntech-power-co-ltd-stp420s-c54-nshb Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.