Is the placement of sunny sensor box for the measurement of solar irradiance horizontal or inclined on www.sunnyportal.com. I could not get enough information on the website or the manual as regards this.
I have some data for solar irradiance from the website and I want to confirm if I needed to convert from horizontal to incident before proceeding with my analysis.
Project Title: Comparative study of the predicted PV systems power output using various models against measured power values
The main aim of the project study the performance of PV system installations at various sites monitored on an hourly basis and compare it with predicted PV system power output using various models.
Specifically, PV systems specifications, hourly power output data, solar irradiance, PV temperature data, and any other available monitored meteorological data at various installation sites will be obtained from an available database. These will be studied in depth and analysed. The various power losses will be investigated along with daily and seasonal variations.
An algorithmic model to predict the PV system power output will be elaborated and the required meteorological data will be obtained from available databases, monitored data and solar radiation prediction models.
Predicted and measured power data will be compared for a summer, winter, spring and autumn month, and for different sites. The PV system performance will be assessed in terms of power, energy and yield.
Further comparisons with results obtained from PV performance software or online resources, such PVGIS, PVWatts will also be carried out.
These comparisons will lead to conclusions upon the reliability of PV performance prediction models and online resources. The effect of different environmental parameters will be evaluated too.
If you place it horizontaly you will need a transposition model (which leads to errors) to get the Irradiance data at the surface of the modules. So, if you're willing to take measures on the same plane of the PV Field you shoul install the Sensor Box on the same angle as the PV Array. If you need to calculate only the Performance Ratio, the tilted sensor will do fine.
Remember that in most simulation scenarios you will have the Horizontal Irradiance and a Software to apply the transposition model on the raw data to get the incident irradiance.
You will need two calculations for different surface orientations: horizontal and tilte. You needs to compare dayly variations of measured and calculeted data to select true orientatin for calculations.
This is most simple part of task. More complex part is to set connection with autors of measurements to define details ;-)
Peter, all those registered include the basic parameters like module specs, azimut and tilt angle. Not all installations are equipped with a sensor box. SMA uses also satellite data which they adjust to the relevant installation at it´s position.
You may contact SMA directly for more details: http://www.sma-uk.com/service/overview.html (scroll down to Service Line)
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