Outstanding Power Performance
The SR50 solar photovoltaic modules efficiently generate power by converting the energy contained in sunlight directly into electricity. They have no moving parts, operate silently, use no fuel, and produce no waste. Built for long-term dependability, the SR50 has a twenty-five year limited warranty on power output.
| Electrical Parameters (1) | SP18 (12V) | SP18 (6V*) | |
| Maximum power rating | Pmax [Watts] | 50 | – |
| Minimum power rating | Pmin [Watts] | 45 | – |
| Rated current | Imp [Amps] | 2.95 | 5.9 |
| Rated voltage | Vmp [Volts] | 17.0 | 8.5 |
| Short circuit current | Isc [Amps] | 3.2 | 6.4 |
| Open circuit voltage | Voc [Volts] | 21.6 | 10.8 |
| Thermal Parameters | ||
| Nominal operating cell temperature (2) | [°C] | 45 |
| Change of Isc with temperature | – | +1.1mA/°C (+0.04%/°K) |
| Change of Voc with temperature | – | -0.079 Volts/°C (-0.34%/°K) |
| Qualification Test Parameters | ||
| Temperature cycling range | [°C] | -40 to +85 |
| Humidity, freeze, damp heat condition | [% RH] | 85 |
| Maximum system voltage | [Volts] | 1000 per ISPRA (EC), 600 per UL 1703 |
| Wind loading or surface pressure | [N/m²] (PSF) | 2400 (50) |
| Maximum distortion (4) | [degrees] | 1.2 |
| Hailstone impact withstand(diameter @ velocity) | [mm @ m/s] (in @ MPH) | 25 @ 23 (1.0 @ 52) |
| Physical Parameters | ||
| Number of series cells | count | 36 |
| Length | [mm] (in) | 783 (30.8) |
| Width | [mm] (in) | 594 (23.4) |
| Depth | [mm] (in) | 34 (1.34) |
| Weight | [kg] (lbs) | 5.9 (13.0) |
| Warranty (5) | ||
| Power >= 90% of minimum power | [Years] | 10 |
- 1. Determined under standard test conditions (STC): Irradiance = 1000w/m² cell temperature = 25 °C; solar spectral irradiance per ASTM E892 (Air Mass = 1.5).
- Determined under nominal operating conditions (NOC): Irradiance = 800 w/m² ambient temperature = 20 °C; wind speed = 1m/s.
- Qualification Tests performed as per CEC 503 Test Specification, to ensure durability and performance in outdoor conditions.
- Diagonal lifting of module corner with three corners fixed.
- To original consumer purchaser. See full Limited Warranty for all conditions.
- * If the designer chooses to use the 6-volt version in a high voltage array configuration, the designer must install custom large bypass diodes and heat sinks around every 6-volt parallel string.
Siemens Solar SR50/SR50Z: Reliable Mid-Range Modules for Off-Grid Power
Siemens Solar’s SR50 and SR50Z modules are mid-range photovoltaic (PV) solutions delivering a 50-watt power output, designed specifically for off-grid applications such as remote residences, telecom stations, and small industrial systems. Part of Siemens Solar’s SR-series, these single crystalline modules are engineered for reliability, efficiency, and durability, featuring a 25-year power warranty and adaptability to harsh environments. This article expands on the original SR50/SR50Z page from our website, providing a detailed guide to their technology, specifications, installation options, benefits, and real-world applications, showcasing Siemens Solar’s expertise in delivering sustainable off-grid energy solutions.
The Importance of Off-Grid Solar Modules
Off-grid solar power has become a critical solution for remote energy needs, with over 770 million people still lacking electricity access in 2023, according to the International Energy Agency (IEA). The SR50 and SR50Z, introduced as part of Siemens Solar’s SR-series, offer a fuel-free, silent alternative to diesel generators, which cost $200-$400 annually per kW in fuel alone. These modules are tailored for applications requiring dependable, moderate power output in areas beyond traditional grid reach.
Why SR50/SR50Z?
- Mid-Range Output: 50 watts per module, perfect for moderate off-grid needs.
- Cost Savings: Saves $100-$200 yearly per kW compared to diesel power.
- Sustainability: Reduces emissions by 0.5-1 ton per kW annually.
- Longevity: Backed by a 25-year power warranty.
Technology Overview
The SR50 and SR50Z feature 36 single crystalline PowerMax® cells, with the SR50Z offering a ZeroBus™ design for enhanced performance in partial shading. Both include a torsion-resistant anodized aluminum frame, EVA encapsulation for weather resistance, and compatibility with 12V battery systems.
Module Specifications
| Specification | SR50 | SR50Z |
|---|---|---|
| Power Output | 50 watts | 50 watts |
| Efficiency | 14-15% | 14-15% |
| Size | 48” x 13” | 48” x 13” |
| Special Feature | Standard design | ZeroBus™ for shading |
A 1 kW array (20 SR50 panels) generates 1,400-1,600 kWh annually, powering small off-grid homes or telecom setups with a 5-10 kWh battery.
Installation Options
- Rooftop Mount: Fixed on cabins or remote buildings.
- Ground Mount: For telecom or industrial sites.
- Portable Setup: Lightweight for temporary use.
Real-World Applications
Alaska Remote Home
A 1 kW SR50 array powers lights and a small fridge, saving $150 yearly in diesel costs.
Africa Telecom Relay
Ten SR50Z panels support a shaded telecom site, reducing emissions by 0.7 tons annually.
Benefits
Saves $100-$200 per kW yearly, ensures reliable off-grid power, and minimizes environmental impact.
Future Vision
Siemens Solar builds on the SR50/SR50Z legacy, aiming for 26% efficiency in future off-grid modules by 2030.
