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System monitoring with LEO At the Staffelstein conference, the Freiburg-based company Tritec introduced LEO, a fascinating device for monitoring PV system performance. LEO measures the irradiation of the sun; sends the data to a central server platform, where a comparison of rated and actual values is conducted; and in case of error, sends the customer an alert via email, fax, or SMS.
Depending on its configuration, LEO can use an analog,
ISDN, or GSM modem that sends system performance data on a daily,
hourly, or monthly basis to the central server operated by Tritec,
where that data is saved. According to Tritec manager Paulus Straub,
storage capacity on the server is unlimited, and information can be
stored there indefinitely. Generally, the price for the base version
guarantees that data is kept on the server for more than five years.
Users have the option of accessing their data with an Internet browser;
they can log on to www.tritec-leo.de to view their system data, or if
available, present it on their own company's homepage.
LEO's design is three-modular: A basic module consists of two digital
interfaces and the integrated modem in plastic housing. For very
detailed system analysis, LEO comes with two more options. The first
is an RS485 serial interface that can be connected to a PC or large
display, or directly to the inverter. The other is an analog module
with two inputs for voltage measurement signals from 0 to 3 V that are
suitable for use with irradiance and temperature sensors. Tritec Energie GmbH
Anne Kreuzmann,
Michael Schmela
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