Objective
Photovoltaic, hybrid electricity supplies for five different sites in the German Alps. The mountain huts are not connected to the grid. Lightning protection of the systems is a major concern. Economic operation and reduced ecological pollution are aims of the project.
Five remote sites are equipped with PV generators for lighting, household appliances, communication equipment and water pumping. The auxiliary generators are foreseen to operate only if the demand cannot be met by the pv part. In the four small installation the inverter operates only on demand of 220 V ac load. The two larger systems use a special transformerless inverter (developed for the project SE/134/83, Rappenecker Hof), which is operating continuously. "Global monitoring" is made for the small installations, and "Analytical monitoring" for the two larger stations.
Nr. of subsystems : 5
Power of subsystems : 900, 1000, 1040, 5000, 5400 Wp
Total power : 13,3 kWp
Backup : Diesel, gas (and wind at one site)
Number of modules : 266
Module description : 20 Siemens SM50 (Purtscheller) and 152 AEG PQ36/45 (Brunnstein, Meiler, Mindelheim) and 94 TST MQ36D/53 (Watzmann).
Connection : 24 V (for systems<+ 1 kWp) or special
Support : special mounting (no holes in the roof) on the sheet metal roofs
Max power tracker : none
Charge controller : special design by Uhlmann Solarelectronic, IBC
Battery : Bayern, Fiamm, Hoppecke, Hagen
Batt. (V) : 24 V for systems <= 1kWp; special connection for the 2 large systems
Capacity (Ah) : 100 and 150 Ah at 162 V, 500 and 600 Ah at 24 V.
Inverter : Special transformerless inverter at two sites. (Watzmannhaus and Mindelheimer Huette) with 10 kVA each of FhG-ISE (sinusoidal).
At two other sites (Purtscheller and Brunnstein): "Al-elektronic" (trapezoidal) with 1.6 kVA each. At Meiler Huette : "Sunpower" 2 kVA (sinusoidal).L oad description : For lights : fluorescent lamps for 24 V and 230 V.
Water pump. Low consumption household appliances, freezers, refrigerators, dish washers ecc. Monitoring : "Global" for the 4 small systems, 11 data, daily,
manual reading of mechanical meters.
"Analytical" for the two larger systems: data,
hourly averages stored in data logger.
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Coordinator
8000 MUNCHEN
Germany
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