---
title: "Suntech STP445S-C54/Nshm Solar Panel: Specs & Datasheet | ComparePV"
description: "Suntech STP445S-C54/Nshm solar panel. Specs: 22.80% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient."
source: "https://comparepv.com/panel/suntech-wuxi-suntech-power-co-ltd-stp445s-c54-nshm"
image: "https://comparepv.com/og/panel/suntech-wuxi-suntech-power-co-ltd-stp445s-c54-nshm.png"
updated: 2026-09-11
---

# Suntech STP445S-C54/Nshm

Efficiency leader, no clear weak spot

1,220 panels in the segment TOPCon 400-450 W


## Identity

- **Manufacturer:** Suntech
- **Model:** STP445S-C54/Nshm
- **Series:** Ultra V Pro mini (STPXXXS-C54/Nshm)
- **Rated power:** 445 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) | 445 W | 435 W | Strong - top 8% |  |
| Module efficiency | 22.80% | 22.00% | Strong - top 1% | 2,769 |
| Power density | 227.9 | 220.2 | Strong - top 2% | 2,845 |
| Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 |
| Weight (kg) | 21.0 kg | 22.0 kg | Strong - top 12% |  |
| Performance warranty | 30 yrs | 30 yrs | Typical | 21 |


### Full peer table


| Measure | This panel | Segment median | Standing | Rank |
| --- | --- | --- | --- | --- |
| Module efficiency | 22.80% | 22.00% | Strong - top 1% | 2,769 |
| Power density | 227.9 | 220.2 | Strong - top 2% | 2,845 |
| Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 |
| Weight per kWp | 47.2 | 51.5 | Strong - top 12% | 1,537 |
| Performance warranty | 30 yrs | 30 yrs | Typical | 21 |


### Strengths

- **22.80% module efficiency** - Top 1% of the TOPCon 400-450 W segment, against a median of 22.00%. Ranked 2,769th in the whole database.
- **227.9 watts per square metre** - Top 2% of the TOPCon 400-450 W segment, against a median of 220.2. Ranked 2,845th in the whole database.
- **47.2 kg per kWp** - Top 12% of the TOPCon 400-450 W segment, against a median of 51.5.

- **Best for:** Residential, commercial, shaded-installations and hot-climate.


## Specification


### Electrical

- **Rated power (Pmax):** 445 W
- **Efficiency:** 22.80 %
- **Voltage at Pmax (Vmp):** 32.87 V
- **Current at Pmax (Imp):** 13.54 A
- **Open-circuit voltage (Voc):** 39.11 V
- **Short-circuit current (Isc):** 14.49 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:** 227.9 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:** 389 W


## Rank in the whole catalogue


| Measure | Position |
| --- | --- |
| Efficiency | 2769 of 14129 |
| Power density | 2845 of 14129 |
| Temperature coefficient | 2220 of 14129 |
| Weight | 1537 of 14129 |
| Warranty | 21 of 14129 |


## About this series

Suntech Ultra V Pro Mini series (STPXXXS-C54/Nshm) are compact modules with enhanced power density, designed for maximum yield from limited rooftop space. The application of N-type TOPCon cells translates to more stable performance over time and reduced sensitivity to degradation mechanisms common in older technologies. Thanks to the half-cut (separated cells) structure, the panel handles local shading better, minimizes resistive losses, and supports higher energy production under real operating conditions.

In practice, this means more predictable yields, especially during summer when heat resistance is crucial - the more favorable temperature coefficient characteristic of TOPCon helps here. Additionally, the series prioritizes durability: high resistance to PID and selected encapsulation materials support long-term installation reliability.

This is a smart choice for single-family homes and small commercial installations, where aesthetics, high yield per square meter, and reliable operation for years matter.


## Notable figures

- 22.8% module efficiency - 0.8pp better than the \*\*TOPCon 400-450W\*\* median of 22.0%
- At 227.9 W/m² power density, this panel generates 7.7 W/m² more 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
- Weight of 21.0 kg is typical for \*\*TOPCon 400-450W\*\* panels
- #2769 for efficiency, #2220 for temperature performance out of 14129 panels


## Questions


### What is the maximum power output of the Suntech Ultra V Pro mini panel, and how many panels are needed for a typical 5 kW system?

Panels in the Ultra V Pro mini series (STPXXXS-C54/Nshm) reach up to 445 Wp. For a 5 kWp system, you need about 11-12 units, and thanks to the module's compact dimensions (roughly 1722 x 1134 mm), the series works well on smaller roof areas where high power density per square meter matters most.


### How does the TOPCon cell technology in the Suntech Ultra V Pro mini differ from older PERC panels?

N-type TOPCon cells, unlike the P-type cells used in common PERC panels, are far less susceptible to light-induced degradation (LID) and offer a better temperature coefficient. In practice, this means higher and more stable energy yield throughout the system's lifetime, especially during summer when panels operate at high temperatures.


### What warranty comes with the Suntech Ultra V Pro mini panels, and what exactly does it cover?

The manufacturer provides a 15-year product warranty against material and workmanship defects, along with a 30-year linear power output warranty. This means that even after three decades of operation, the panel is expected to retain a guaranteed percentage of its initial power, translating into predictable long-term returns on investment.


### Are the Suntech Ultra V Pro mini panels PID-resistant and suitable for harsher climate conditions?

Yes, the series features high resistance to potential-induced degradation (PID) thanks to carefully selected encapsulation materials. Combined with the half-cut cell design, which reduces resistive losses, the panels maintain stable performance both in high summer temperatures and in the variable humidity conditions typical of a temperate climate.


### Is Suntech a tier 1 manufacturer, and is it a reliable choice for a single-family home roof?

Yes, Suntech is classified as a tier 1 manufacturer, meaning it has an established financial standing and years of production experience in China, which lowers the risk of warranty servicing issues down the line. The Ultra V Pro mini series, with its compact size and clean aesthetics, is a popular choice for single-family homes where both appearance and long-term reliability matter.


### Does the half-cut cell design in the Ultra V Pro mini panels matter for partial roof shading?

Yes, splitting cells into halves (half-cut) means that when part of the panel is shaded by a chimney, antenna, or neighboring building, the resulting power loss is smaller than with traditional full-cell panels. This design also reduces resistive losses and improves overall module efficiency under real-world operating conditions.


## Datasheet

[Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/48132906567db90eb41db3-c380458de473.pdf)


## Alternatives


| Panel | Power | How it differs |
| --- | --- | --- |
| [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +50 W, cooler, +2.0 pp |
| [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +45 W, cooler, +1.7 pp |
| [Suntech STP-NT11/48QGSF-490](https://comparepv.com/panel/suntech-stp-nt11-48qgsf-490) | 490 W | +45 W, cooler, +1.7 pp |
| [JA Solar JAT54S40-485/LR](https://comparepv.com/panel/ja-solar-jat54s40-485-lr) | 485 W | +40 W, cooler, +1.5 pp |
| [AIKO AIKO-A485-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a485-mce54mw) | 485 W | +40 W, cooler, +1.5 pp |
| [Longi Solar LR7-54HJD-495M](https://comparepv.com/panel/longi-lr7-54hjd-495m) | 495 W | +50 W, cooler, +1.5 pp |
| [AIKO AIKO-A485-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a485-mah54mw) | 485 W | +40 W, cooler, +1.5 pp |
| [Suntech STP390S-C54/Umh](https://comparepv.com/panel/suntech-stp390s-c54-umh) | 390 W | -55 W, hotter, -2.9 pp |
| [Suntech STP395S-C54/Umhm](https://comparepv.com/panel/wuxi-suntech-power-co-ltd-suntech-stp395s-c54-umhm) | 395 W | -50 W, hotter, -2.6 pp |
| [Suntech STP395S-C54/Umh](https://comparepv.com/panel/suntech-stp395s-c54-umh) | 395 W | -50 W, hotter, -2.6 pp |
| [Suntech STP400S-C54/Umhm](https://comparepv.com/panel/wuxi-suntech-power-co-ltd-suntech-stp400s-c54-umhm) | 400 W | Hotter, -2.3 pp, -5 yr warranty |
| [Suntech STP400S-C54/Umh](https://comparepv.com/panel/suntech-stp400s-c54-umh) | 400 W | Hotter, -2.3 pp, -5 yr warranty |
| [Suntech STP405S-C54/Umhm](https://comparepv.com/panel/wuxi-suntech-power-co-ltd-suntech-stp405s-c54-umhm) | 405 W | Hotter, -2.1 pp, -5 yr warranty |
| [Suntech STP405S-C54/Umh](https://comparepv.com/panel/suntech-stp405s-c54-umh) | 405 W | Hotter, -2.1 pp, -5 yr warranty |
| [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +65 W, cooler, +2.2 pp |
| [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +60 W, cooler, +1.9 pp |


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Source: https://comparepv.com/panel/suntech-wuxi-suntech-power-co-ltd-stp445s-c54-nshm

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.