The LPPYRA-Lite is a compact, cost-effective thermopile pyranometer designed for small-scale PV system monitoring. Offering Class C accuracy according to ISO 9060:2018, it delivers reliable solar irradiance measurements (0-2000 W/m²) with the spectral flatness of a premium instrument. Its small, lightweight design allows for direct installation on PV panel frames, eliminating the need for complex mounting. Available in multiple output versions (passive mV, 4-20 mA, Modbus-RTU, SDI-12), it provides a simple and affordable solution for ordinary efficiency monitoring of solar installations.
Affordable Precision for Solar Efficiency Monitoring
The DeltaOHM LPPYRA-Lite pyranometer brings high-quality solar radiation measurement within reach for smaller photovoltaic (PV) systems. By utilizing a precise thermopile sensor instead of a simple photodiode, it accurately measures the total hemispherical solar radiation—the true energy source for your panels. This makes it an essential tool for PV plant owners and operators to monitor system performance, calculate efficiency, and verify energy output.
Engineered for Simple and Direct Integration
Designed with practicality in mind, the LPPYRA-Lite features an exceptionally compact and lightweight form factor. This allows it to be mounted directly onto the plane of a PV panel using a simple fixing adapter, perfectly aligning it with the array without the need for a separate mast or complex leveling on tilted surfaces. For horizontal installations, an optional adapter with an integrated leveling device ensures a perfect setup.
Key Advantages & Features
- Class C Accuracy: Classified as "Spectrally Flat Class C" according to ISO 9060:2018 and compliant with WMO recommendations, ensuring reliable and standardized data.
- True Thermopile Technology: Measures the full solar spectrum (300-2800 nm) for accurate irradiance data, unlike cheaper silicon sensors.
- Compact & Lightweight: Minimal size (55mm) and weight (150g) enable easy, discreet installation directly on PV panels.
- Multiple Output Options: Choose from passive mV output or active versions with 4-20 mA current loop, RS485 Modbus-RTU, or SDI-12 digital interfaces for seamless integration into any monitoring system.
- Rugged and Maintenance-Free: IP67 rated for weather resistance and designed for long-term stability (MTBF >10 years) in harsh environments (-40°C to +80°C).
Measures & How to Use
- Primary Application: Ordinary monitoring of small to medium-sized PV power plants to calculate system efficiency and performance ratio (PR).
- For tilted installation on a PV panel, use the LP540/32 fixing adapter to secure the pyranometer directly to the panel frame.
- For horizontal installation on a mast, use the optional LP540/32BL adapter with an integrated leveling device (<0.2° accuracy).
- Connect the instrument using the appropriate pre-made cable (e.g., CPM12AA4 for analog versions) for a quick, IP67-sealed connection.
- Each sensor is individually calibrated; the unique calibration factor is printed on the device body for precise data calculation.
| Parameter | Specification |
|---|---|
| Sensor | |
| Type | Thermopile |
| Measuring Range | 0 to 2000 W/m² |
| Typical Sensitivity | 5…15 μV/(W/m²) or normalized 7 μV/(W/m²) |
| Spectral Range (50%) | 300 to 2800 nm |
| Viewing Angle | 2π sr (180°) |
| Output Versions | |
| LPPYRA-Lite | Analog, μV/(W/m²) (impedance 33…45 Ω) |
| LPPYRA-LiteAC | 2-wire, 4…20 mA (RL ≤ 500 Ω) |
| LPPYRA-LiteS | RS485 Modbus-RTU |
| LPPYRA-LiteS12 | SDI-12 |
| Electrical | |
| Power Supply | LPPYRA-Lite: Not required LPPYRA-LiteAC: 10…28 Vdc LPPYRA-LiteS: 5…30 Vdc LPPYRA-LiteS12: 7…30 Vdc |
| Connection | LPPYRA-Lite / LPPYRA-LiteAC: 4-pole M12 LPPYRA-LiteS / LPPYRA-LiteS12: 8-pole M12 |
| General | |
| Operating Temperature | -40 to +80 °C |
| Protection Degree | IP67 |
| Weight | 150 g (approx.) |
| MTBF | > 10 years |
| According to ISO 9060:2018 (Class C) | |
| Response Time (95%) | < 25 s |
| Non-linearity | < ±2 % |
| Temperature Response (-10…+40 °C) | < ±3 % |
| Brand | Senseca |
