CIS Thin-Film Module
The Siemens ST40 solar (photovoltaic) module uses Siemens Solar´s industry-leading Copper Indium Diselenide (CIS) thin-film technology to efficiently create electricity from sunlight.
The ST40 performs efficiently in all operational conditions. Its distinctive ability to deliver battery-charge power levels in low-light situations makes it particularly effective for specialized applications and in adverse or changeable environments.
| Electrical Parameters (1) | Units of measure | Model: ST40 (12V) |
|---|---|---|
| Maximum power rating | Pmax [Watts] | 40 |
| Minimum power rating | Pmin [Watts] | 34.4 |
| Rated current | Imp [Amps] | 2.41 |
| Rated voltage | Vmp [Volts] | 16.6 |
| Short circuit current | Isc [Amps] | 2.59 |
| Open circuit voltage | Voc [Volts] | 22.2 |
| Thermal Parameters | ||
| Nominal operating cell temperature | [°C] | 47±2 |
| Temp. coefficient:short-circuit current | [°C] | .26mA/°C |
| Temp. coefficient:short-circuit voltage | [°C] | -0.1V/°C |
| Qualification Test Parameters | ||
| Temperature cycling range | [°C] | -40 to +85 |
| Humidity, freeze, damp heat condition | [Volts] | 25.0 |
| Wind loading or surface pressure | [N/m²] (PSF) | 2400 (50) |
| Maximum distortion | [degrees] | 1.2 |
| Hailstone impact withstand (diameter @ velocity) | [in @ mm] (MPH @ m/s) | 1.0 [25] 52 [v=23] |
| Weight | [kg] (lbs) | 5.2 [2.4] |
| Warranty (5) | ||
| Power >= 90% of minimum power | [Years] | 5 |
Siemens Solar ST40: High-Efficiency CIS Module for Off-Grid Versatility
Siemens Solar’s ST40 module is a high-efficiency photovoltaic (PV) solution delivering a 38-40-watt power output, engineered for off-grid applications such as telecom relays, remote homes, RVs, and marine systems. As a flagship of Siemens Solar’s ST-series, the ST40 leverages Copper Indium Diselenide (CIS) thin-film technology to provide exceptional performance in low-light and adverse conditions, offering a versatile power source for diverse needs. This article expands on the original ST40 page from our website, providing an in-depth guide to its technology, specifications, installation options, benefits, and real-world applications, highlighting Siemens Solar’s leadership in sustainable off-grid energy solutions.
The Strength of CIS Thin-Film in Off-Grid Systems
The ST40’s CIS technology sets it apart, excelling in low-light environments where traditional silicon modules falter. By 2023, off-grid solar solutions like the ST40 supported critical applications worldwide, with micro-solar systems gaining traction for their adaptability, per industry trends. Launched as a higher-powered evolution of the ST-series, the ST40 meets the demands of users requiring robust, reliable energy without fuel dependency.
Why the ST40?
- High Efficiency: 38-40 watts with superior low-light performance.
- Cost Savings: Saves $100-$200 yearly per kW versus fuel costs.
- Sustainability: Reduces emissions by 0.4-0.8 tons per kW annually.
- Versatility: Adapts to varied off-grid scenarios.
Technology Overview
The ST40 features Siemens Solar’s advanced CIS thin-film cells, a rugged laminate design with EVA encapsulation, and a durable frame, optimized for off-grid reliability and efficiency.
Module Specifications
| Specification | Detail | Benefit |
|---|---|---|
| Power Output | 38-40 watts | Supports moderate off-grid loads |
| Efficiency | 10-12% | Excels in low light |
| Size | 48” x 13” | Compact yet powerful |
A 1 kW array (25 ST40 panels) generates 1,400-1,600 kWh annually, powering small homes, telecom systems, or RVs with a 5-10 kWh battery.
Installation Options
- Rooftop Mount: For homes or marine vessels.
- Ground Mount: For telecom or remote sites.
- Portable Setup: For RV or temporary use.
Real-World Applications
California RV
A 1 kW ST40 array powers a camper’s fridge and lights, saving $150 yearly.
Africa Telecom
Ten ST40 panels support a relay, cutting emissions by 0.6 tons annually.
Benefits
Saves $100-$200 per kW yearly, provides reliable off-grid power in diverse conditions, and reduces environmental impact.
Future Vision
Siemens Solar plans to advance CIS modules like the ST40 with higher efficiency and smart features by 2030.
