How HelioClim can contribute to the installation and the monitoring of pv-installations |
A problem of units ? of terminology ? Consult the Education service. |
- Before the installation
- Just after
- Monitoring along the life of the installations beware the leadtimes!
- Nowcasting
Definition of the monitoring: the different types of monitoring
Control of the specification parameters of a pv-installation: before the construction of a residential or industrial pv-installation, banks and investors need to rely on an accurate and complete report on the solar potential of the site under concern. The solar potential of a site is usually given by averaged typical meteorological year. The installators use the solar potential of the site in order to get a primary theoretical estimation of the averaged electrical production of the installation expected during the years to rentabilize the installation. The solar potential of a site can also be to explore the worse and the best situation occured in a past time period.
| Step of the project | Who is concerned | What is their needs? | What do they use? |
| Before installation | Banks | Needs reliable reports on the solar potential of a site | No fully approved version of reliable reports is widely accepted and used by the banks. They ask for solar assessment the closest to reality, relying sometimes on irrealisable uncertainties. |
| Investors | Must answer the requirements of the banks in conjunction of their financial potential | PVsyst with a year of synthetic / averaged data (example: Meteonorm, PVGIS...). For big PV-plants, investors might also settle a ground station (pyranometer for instance) to collect data for several months or a year to build the report on actual data. |
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| During the life of the PV-plant | punctual monitoring of the plant (once a month or once a year) | - Global Horizontal par mois avec une grande précision (pour comparer après une années écoulée la production réelle et la production idéale pour trouver le PR de l’installation). | |
| OR monitoring in "real time" of the plant | - Les données heures par heure Globale, diffuse sur l’horizontale ou le plan incliné pour faire du « fault finding » et mettre le doigt sur certains problème (ombres entre autre). |
Noirot, Invictus 28 av 2011: Pour le suivi en temps réel, on a nos pyranometres et autres sonde d’irradiation mais le caractère indépendant et indiscutable (moyennant les intervalles de confiance des données) est intéressant pour les garantie de production et de performance.
Study of a case: origins of the discrepancy between HC and a pyranometer
A Customer (?)uses one pyranometer CMP3 (thermopile +/- 5% of precision daily values) on each of his sites. He computed for each site
- pr = Electrical production/GTIpyra
- pr = Electrical production/GTIsoda
He observed that during the winter period, SoDa delivered too low values compared to the ones of the pyranometer for two months.
Possible origins of discrepancies:
- what is the time reference of the data given by the pyranometer? The SoDa are in UT.
- The instant returned by the pyranometer corresponds to the end, the middle or the beginning of the time interval? SoDa is always the end.
Last update: 8/7/12 12:27 PM