Objective
To demonstrate that pv generators can be integrated harmoniously into the roofs of prefabricated houses (Fertighaeuser) and that the other pv system components can be integrated as well in industrially produced houses. The pv supply is used for peak load lopping in grid connected houses.
The general satisfactory operation of all three systems continues with the concept of the decentralized mains relief, except at site III (Berlin) were due to the type of user (office building) no peak demand occurs.
It was found, that the option to feed excess energy into the mains would increase the efficiency of such systems; hence the option of feeding excess power into the mains will be possibly explored at all three sites, especially at Berlin.
After solution of some minor structural problems (bending of modules, dirt accumulation on horizontal profiles, solved by elastic joints) the project has shown, that pv modules can be integrated into the roofs with satisfactory constructional and aesthetical features.
The average annual energy production of one system is 1040 kWh.
Energy cost is calculated to be 10.4 Ecu/kWh (2.9 Ecu/kWh for a replication) and 1.6 Ecu/kWh for grid connected systems without battery.
Three prefabricated houses in Lauenstein (site I), Roetenbach near Neustadt/Baden (site II) and Berlin (site III) are equipped with an integral PV system consisting of a 1.85 kWp roof mounted array (42 AEG monocrystalline modules of type PQ/10/44/01).
Battery charging is made through a charge controller, type "SOLARMATIC" (AEG), based on measurements of (temperatures compensated) battery voltages.
The system in the Lauenstein house has a 420 Ah/216 V battery with recombination, the Roetenbach house a 532 Ah/216 V battery with ceramic plugs and the Berlin house a 315 Ah/21 V sealed battery.
Each house is equipped with an AEG inverter type "TRANSSOLAR" or "TRANSOPULS", 5 kVA, monophase, self-commutated, an adapted UPS unit.
Operation of the systems are based on the principle of peak lopping :
When the electricity consumption in the house rises above a predefined level, the automatic control system draws the extra power required from the PV system rather than from the grid.
Each house has a data logger DAM-800 (AEG). Data are available (with interruptions) for the periods from June 1988 to July 1991.
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Programme(s)
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Funding Scheme
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Coordinator
30419 Hannover
Germany
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.