--- title: "Suntech STP425S-C54/Nshkm+ Solar Panel: Specs & Datasheet | ComparePV" description: "Suntech STP425S-C54/Nshkm+ solar panel. Specs: 21.80% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/wuxi-suntech-power-co-ltd-stp425s-c54-nshkm" image: "https://comparepv.com/og/panel/wuxi-suntech-power-co-ltd-stp425s-c54-nshkm.png" updated: 2026-09-11 --- # Suntech STP425S-C54/Nshkm+ Solid all-round for its segment 1,220 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** Suntech - **Model:** STP425S-C54/Nshkm+ - **Series:** Ultra V Pro mini (STPXXXS-C54/Nshkm+) - **Rated power:** 425 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) | 425 W | 435 W | Typical | | | Module efficiency | 21.80% | 22.00% | Typical | 7,085 | | Power density | 217.6 | 220.2 | Typical | 7,235 | | 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 | 21.80% | 22.00% | Typical | 7,085 | | Power density | 217.6 | 220.2 | Typical | 7,235 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 | | Weight per kWp | 49.4 | 51.5 | Typical | 2,916 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Residential, commercial and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 425 W - **Efficiency:** 21.80 % - **Voltage at Pmax (Vmp):** 32.15 V - **Current at Pmax (Imp):** 13.22 A - **Open-circuit voltage (Voc):** 38.59 V - **Short-circuit current (Isc):** 14.17 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:** 217.6 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:** 371 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 7085 of 14129 | | Power density | 7235 of 14129 | | Temperature coefficient | 2220 of 14129 | | Weight | 2916 of 14129 | | Warranty | 21 of 14129 | ## About this series Suntech Ultra V Pro Mini series (STPXXXS-C54/Nshkm+) are compact premium-class modules designed for maximum energy production on limited roof space. The use of **N-type TOPCon cells** translates to more stable performance over time and excellent efficiency in challenging conditions, such as when the installation heats up in summer or operates under variable sunlight. The **dual glass (glass-glass) construction** increases resistance to micro-cracks, moisture, and mechanical stress, which investors valuing longevity will appreciate. The **108 half-cut cell configuration** helps minimize losses and improves module performance under partial shading, such as from chimneys or window frames. In practice, this means higher yields and reduced risk of mismatch in the string. This is an excellent choice for single-family homes and small commercial buildings, where **high power density**, aesthetics, and reliability for years matters. It stands out from the competition by combining TOPCon technology with a durable glass-glass structure in a format friendly to rooftops. ## Notable figures - Efficiency of 21.8% matches the \*\*TOPCon 400-450W\*\* median - Power density of 217.6 W/m² matches the \*\*TOPCon 400-450W\*\* median - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 400-450W\*\* panels - Weight of 21.0 kg is typical for \*\*TOPCon 400-450W\*\* panels - Ranked #7085 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/Nshkm+ panel? Panels in the Ultra V Pro mini series reach a maximum power output of up to 445 Wp. This is a strong result for a compact 108 half-cut cell format, delivering good power density per square meter of roof. This allows for a higher total installed capacity on limited roof space compared to older-generation modules. ### How does the TOPCon technology in the Suntech Ultra V Pro mini differ from standard PERC cells? The N-type TOPCon cells used in this series feature lower thermal losses and slower power degradation compared to conventional P-type PERC cells. In practice, this means more stable energy production at high summer temperatures and better performance under diffuse or weaker light conditions, such as on cloudy days. ### Are Suntech Ultra V Pro mini panels suitable for a pitched roof on a single-family home? Yes, the Ultra V Pro mini series was designed primarily for single-family homes and small commercial buildings. Its compact format and high power density allow more wattage to fit on limited pitched roof space, while the dual glass construction handles wind and snow loads typical of these installations well. ### What warranty comes with the Suntech Ultra V Pro mini panels? The manufacturer provides a 15-year product warranty and a 30-year linear power output warranty. This means the panel is expected to maintain a guaranteed percentage of its original performance for three decades, giving investors confidence in the long-term profitability of the PV installation. ### Is the dual glass construction of the Suntech Ultra V Pro mini more durable than standard panels? Yes, the dual glass construction replaces the rear backsheet with a second layer of tempered glass, significantly increasing the module's resistance to microcracks, moisture ingress, and mechanical loads such as hail or snow pressure. Panels built this way better withstand harsh weather conditions and retain their performance over many years of operation. ### Are Suntech Ultra V Pro mini panels bifacial? No, this series uses single-sided (monofacial) cells rather than bifacial technology. This means the module generates energy only from direct sunlight hitting the front side, which is a well-proven and standard solution for typical rooftop installations, where the rear side of the panel has no access to reflected light anyway. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/25775784167db904d75d1d-154c6e454387.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Maxeon SPR-MAX7-475](https://comparepv.com/panel/maxeon-spr-max7-475) | 475 W | +50 W, +2.2 pp, +10 yr warranty | | [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 | +40 W, hotter, +2.0 pp | | [JA Solar JAT54S40-475/LR](https://comparepv.com/panel/ja-solar-jat54s40-475-lr) | 475 W | +50 W, cooler, +2.0 pp | | [Tongwei TWMNH-48HW475](https://comparepv.com/panel/tongwei-solar-twmnh-48hw475) | 475 W | +50 W, heavier, +2.0 pp | | [Astronergy CHSM48RN(DG)/F-BH-475](https://comparepv.com/panel/astronergy-chint-new-energy-technology-co-ltd-chsm48rn-dg-f-bh-475) | 475 W | +50 W, heavier, +2.0 pp | | [AIKO AIKO-A475-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a475-mce54mw) | 475 W | +50 W, cooler, +2.0 pp | | [AIKO AIKO-A475-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a475-mah54mw) | 475 W | +50 W, cooler, +2.0 pp | | [Suntech STP390S-C54/Umh](https://comparepv.com/panel/suntech-stp390s-c54-umh) | 390 W | Hotter, -1.9 pp, -5 yr warranty | | [Suntech STP395S-C54/Umhm](https://comparepv.com/panel/wuxi-suntech-power-co-ltd-suntech-stp395s-c54-umhm) | 395 W | Hotter, -1.6 pp, -5 yr warranty | | [Suntech STP395S-C54/Umh](https://comparepv.com/panel/suntech-stp395s-c54-umh) | 395 W | Hotter, -1.6 pp, -5 yr warranty | | [Suntech STP400S-C54/Umhm](https://comparepv.com/panel/wuxi-suntech-power-co-ltd-suntech-stp400s-c54-umhm) | 400 W | Hotter, -1.3 pp, -5 yr warranty | | [Suntech STP400S-C54/Umh](https://comparepv.com/panel/suntech-stp400s-c54-umh) | 400 W | Hotter, -1.3 pp, -5 yr warranty | | [Suntech STP405S-C54/Umhm](https://comparepv.com/panel/wuxi-suntech-power-co-ltd-suntech-stp405s-c54-umhm) | 405 W | Hotter, -1.1 pp, -5 yr warranty | | [Suntech STP405S-C54/Umh](https://comparepv.com/panel/suntech-stp405s-c54-umh) | 405 W | Hotter, -1.1 pp, -5 yr warranty | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +85 W, cooler, +3.2 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +70 W, cooler, +3.0 pp | --- Source: https://comparepv.com/panel/wuxi-suntech-power-co-ltd-stp425s-c54-nshkm Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.