Programm Photovoltaik Ausgabe 2008 ... - Bundesamt für Energie BFE

SIWIBU / SIMIBU
Eidgenössisches Departement für
Umwelt, Verkehr, Energie und Kommunikation UVEK
Bundesamt für Energie BFE
SOLAR INVERTER WITH INTEGRATED BACKUP
SOLAR INVERTER MIT INTEGRIERTEM BACKUP
Annual Report 2007
Author and Co-Authors Peter Toggweiler, Sandra Stettler, Pascal Felder von Sputnik Eng.
Institution / Company Enecolo AG
Address Lindhofstrasse 52, CH - 8617 Mönchaltorf
Telephone, E-mail, Homepage + 41 (0) 44 994 90 00, info@enecolo.ch, www.solarstrom.ch
Project- / Contract Number 101807 / 152227
Duration of the Project (from – to) October 2006 – December 2007
Date 6. December 2007
ABSTRACT
Conventional grid feeding solar inverters have to switch off during grid outages. This fact is inconvenient
in regions with frequent power outages or where high supply quality is required. A feasibility
study is performed for an inverter with basically three functions:
� Direct grid feeding of PV power
� Uninterruptible Power Supply (UPS) for dedicated appliances during grid outages
� Additional grid support from battery storage during peak demand hours
Contents of the study are an evaluation of existing inverters with similar functions, a market study for
UPS devices, determination of potential market segments and barriers for market entry as well as the
development of a technical concept together with the company Sputnik Engineering AG.
The field of application of SIWIBU is not only seen in industrial countries with feed-in tariffs for Photovoltaics
but also in emerging nations in Africa and Asia where severe problems with grid stability exist
and where at the same time renewable energies are supported by international development programs.
SIWIBU also answers to the demand of developing countries for stand-alone power stations
that can be integrated into the grid, once it will be available. Although the market potential is visible, it
is difficult to predict how fast and with what level of effort this un-tabbed potential may be explored.
The initial results show clearly that the product can be produced under the given targets related to
cost and operational flexibility. Expanding the UPS operation time by connecting the PV-array to the
UPS battery and the guarantied grid support during peak load time looks quit attractive. Evaluation
results of the electricity supply situation in California show a high potential for this operation mode. A
key finding is, that the value of the entire solar supply increases, if the supply during peak hours is
guarantied.
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