Results and Discussion for the System of Rauhelleren

The HOMER software tool was also used for the techno-economic analysis of both the existing diesel-based autonomous power system and the envisaged wind-hydrogen system of Rauhelleren. The detailed results and respective discussion of power system analysis performed are given in the following sections. 

More specifically, the system of Rauhelleren comprises a 36 kW diesel generator and a battery bank of 150 kWh. With respect to costs used in the simulation of the existing system, the capital cost of diesel generator was 450 /kW resulting in a total capital cost of 16,200 including the diesel tank. The cost of diesel fuel was set to 0.8 /L. The capital cost of the battery bank used in our calculations was 100 /kWh, therefore for the 150 kWh battery bank installed in the Rauhelleren system the total acquisition cost was 15,000 . The project lifetime was 16 years. 

Continuing with the presentation of the simulation results for the existing diesel-based power system, we would like to stress that that this is a 100% fossil-fuel-based power system. The analysis conducted showed that the system produces annually 43,232 kWh, which cover both the electric and heat demand of the mountain cabin. Excess electricity produced by the specific system is only 2%. These results are summarised in Table 5.11. 

As mentioned before, this system provides power to the mountain cabin only during April, May, July, August and September. Therefore, we can conclude that this is an autonomous power system with a good potential for seasonal storage of hydrogen (if this is necessary to cover power demand of the cabin) when a renewable energy source, namely a wind turbine, is incorporated. 

Component Annualised capital ( /yr) Annualised replacement ( /yr) Annual O M ( /yr) Annual fuel ( /yr) Total annualised ( /yr) 

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