Solar Module Temperature Sensor

NBL-W-PPT Solar Module Temperature Sensor Product Details: 

The NBL-W-PPT Solar Module Temperature Sensor (transmitter) is a high-precision temperature monitoring device specially designed to optimize photovoltaic power systems. This product uses military-grade thermistors as the core temperature sensing element, combined with advanced signal conditioning circuits, to accurately and real-time measure the operating temperature of photovoltaic modules. By converting temperature signals into standard electrical outputs, this product can seamlessly integrate into various data acquisition systems, providing key data support for the efficiency optimization, fault diagnosis, and intelligent operation and maintenance of photovoltaic power plants. 

In the photovoltaic power generation field, every 1°C rise in module temperature can cause a reduction in output power by 0.3%-0.5%. With a measurement accuracy of ±0.5°C and fast response characteristics, the NBL-W-PPT helps operators accurately monitor the module's operating state, maximizing power generation efficiency. The product features an IP67 protection rating, making it suitable for various harsh outdoor environments and ensuring long-term stable operation.

Core Advantages of the Solar Module Temperature Sensor: 

1. Accurate Temperature Measurement, Improving Power Generation Profitability:

   - Uses imported high-precision NTC thermistors with a temperature measurement error of no more than ±0.5°C

   - Fast response design, with temperature changes reflected accurately within 3 seconds

   - A contact-based temperature measurement solution optimized for photovoltaic modules, accurately reflecting the temperature of the cells 

2. Flexible System Compatibility:

   - Provides multiple output options, including 4-20mA, 0-5V, and RS485

   - Supports Modbus RTU protocol for direct integration with SCADA systems

   - Wide voltage power supply design (5-24VDC) to suit different site conditions 

3. Industrial-grade Reliable Design:

   - Fully sealed stainless steel probe, with an IP67 protection rating

   - Weather-resistant silicone cable, capable of operating in environments ranging from -50°C to 100°C

   - Electromagnetic interference-resistant design ensures stable signal transmission 

4. Convenient Installation and Maintenance:

   - Comes with high thermal conductivity silicone gel to ensure perfect adhesion of the temperature measurement point to the module

   - Standard 5-meter cable length to meet most installation needs

   - Modular design for quick replacement 

Technical Specifications of the Solar Module Temperature Sensor:

Typical Application Scenarios: 

1. Photovoltaic Power Plant Efficiency Optimization:

   - Real-time monitoring of module temperature provides key parameters for MPPT algorithms

   - Identifies hot spot effects, preventing module damage

   - Evaluates cooling system performance and optimizes heat dissipation schemes 

2. Power Plant Health Monitoring Systems:

   - Acts as a key sensor node in intelligent operation and maintenance systems

   - Works with IV curve scanners for fault diagnosis

   - Provides environmental parameters for power generation forecasting models 

3. Photovoltaic Module Research and Testing:

   - Tests module temperature characteristics in laboratory environments

   - Evaluates the effects of new cooling technologies

   - Verifies module reliability through experimental testing 

4. Agricultural Photovoltaic Projects:

   - Monitors module temperature in photovoltaic greenhouses

   - Studies the impact of module temperature on crop growth

   - Optimizes photovoltaic-agriculture hybrid systems

Installation and Operation Guide for the Solar Module Temperature Sensor: 

Preparation Before Installation:

1. Confirm Installation Location: Choose the center area of the module's back panel, avoiding junction boxes and borders.

2. Clean Installation Surface: Use alcohol swabs to clean the surface, ensuring it is free from dust and oil.

3. Environmental Check: Ensure the ambient temperature is within the range of -10°C to 50°C during installation. 

Standard Installation Steps:

1. Apply Thermal Interface Material:

   - Use the supplied thermal conductive silicone gel.

   - Apply it to a rectangular area of 22×12mm on the cleaned back panel.

   - Ensure the thickness of the gel layer is about 0.5mm. 

2. Fix the Sensor:

   - Press the sensor probe firmly along the long axis of the module.

   - Maintain stable pressure for about 5 minutes to ensure full adhesion.

   - Check for any bubbles or gaps along the edges. 

3. Cable Management:

   - Route the cables along the module frame, securing them every 30cm with cable ties.

   - Leave enough slack to avoid pulling on the sensor.

   - Ensure the cable’s bend radius is no less than 5cm. 

4. System Connection:

   - Choose the appropriate output mode based on the acquisition device interface.

   - Perform signal testing to confirm normal readings.

   - Ensure waterproofing (using waterproof connectors or tape). 

Installation Precautions:

Avoid installation in rainy or high-humidity environments.  

Do not bend or twist the sensor probe.  

Ensure cables are not worn by the module’s edges.

Why Must Photovoltaic Power Plants Monitor Module Temperature? 

1. Impact of Temperature on Power Generation Efficiency:

   Photovoltaic modules have a negative temperature coefficient, typically around -0.3% to -0.5%/°C. This means:

   - When the module temperature rises from 25°C to 60°C, output power may decrease by more than 10%.

   - During high-temperature periods in summer, the actual power generation of a power plant may be 15%-20% lower than the rated value. 

2. Temperature-related Module Degradation:

   - High temperatures accelerate EVA film yellowing and delamination.

   - Temperature cycling causes fatigue and breakage of the soldering ribbons.

   - Hot spot effects cause permanent damage to the cells. 

3. Support for Operation and Maintenance Decisions:

   - Identifies poorly cooled strings.

   - Evaluates the effect of cleaning on temperature reduction.

   - Optimizes inverter working parameters. 

Service and Support:

- Provides a 12-month warranty service.

- Offers lifetime technical support. 

Customization Services:

- Special range customization available (up to 150°C).

- Cable length customization available (up to 200m).

- Wireless transmission module integration available.

FAQ: 

Q: Does the sensor need to be calibrated regularly?  

A: Calibration is recommended every two years, and we offer free calibration services.

 Q: Can the temperature of the module’s front side be monitored?  

A: It is not recommended. Front-side temperature measurements are highly affected by solar radiation, and back-side measurements more accurately reflect the actual working temperature of the cells. 

Q: How to determine if the sensor is functioning properly?  

A: You can check if the output signal changes with temperature variations to determine if the sensor is working correctly. 

Q: How many sensors should be installed per string?  

A: It is generally recommended to install one sensor for every 10-15 modules at representative locations.

Solar Module Temperature Sensor data sheet

NBL-W-PPT-SMD-Solar-Panel-Temperature-Sensors.pdf