Key Takeaways
- Minimize the error margin of satellite data with local measurement.
- Perform accurate PR calculation with a precise Pyranometer.
- Normalize efficiency loss with a panel temperature sensor.
- Protect tracker systems with a wind sensor.
Measuring a PV plant's performance by looking at production data alone can be misleading. A plant producing 1 MW might actually be losing output when, given the current weather conditions, it should be producing 1.2 MW. The only way to understand this gap is on-site meteorological measurement.
Why Isn't Satellite Weather Data Enough?
Many operators use satellite-based irradiance data to avoid costs. However, satellite data provides average values for areas of 1-10 km² and cannot capture local cloud cover, micro-climate effects or instantaneous changes. SolarTools weather stations measure the actual irradiance at the plant site, minimizing the margin of error in the PR (Performance Ratio) calculation.
Irradiance Sensors and PR Calculation
Performance Ratio (PR) is the most fundamental metric showing a plant's quality. SolarTools weather stations measure incoming energy with precise irradiance sensors (Pyranometers) placed parallel to the panel plane. This lets you scientifically prove how close your plant runs to its theoretical capacity.
The Effect of Panel Temperature on Efficiency
Solar panels lose efficiency as they heat up. Using the panel temperature data from our weather station, we normalize temperature-related losses to analyze real system performance. This data forms the basis for cooling or cleaning strategies.
Wind and Snow Load Tracking
Not only efficiency but also safety is our priority. Wind speed and direction sensors act as triggers to move tracker systems to a safe position during storms. Snow-depth sensors optimize cleaning operations.
Frequently Asked Questions
Is a weather station necessary for every plant?
For all commercial plants of 500 kWp and above, at least one standard weather station is recommended to measure the health of the investment.
How often should the sensors be calibrated?
Irradiance sensors (Pyranometers) are recommended to be calibrated periodically for data accuracy.
Can station data be integrated into the SCADA system?
Yes. Thanks to their Modbus RTU output, SolarTools stations can connect directly to all existing SCADA systems.
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