The schematic for the optimal energy system that met our targets for 2030 scenario 1 is shown to the right. 500kW of PV panels and 1.05MW of Lithium-Ion batteries were added to the islands current energy system. The turbines labelled ‘V27’ represent the three 225kW vergnet vestas turbines, and the turbine labelled ‘E33’ is the 330 kW Enercon turbine. The back-up deisel generator is labelled ‘Gen’.
The addition of PV panels contributed to meeting the carbon reduction target by reducing grid dependency in the summer months, when there is lower power output from the wind turbines. Because of the export limit on the grid connection, the addition of extra installed renewables had to be supplemented with storage. Tesla powerpack lithium ion batteries were selected after a performance comparison with Rolls Surrette Lead acid batteries, that are currently used on Eigg - results of which can be viewed here. |
As evident in the graph below of the average monthly production from each energy source, the island is still relying on the grid more heavily in the summer, than in the winter. However, compared to the current system on the island, grid purchases in summer months are reduced in this scenario due to the output from the PV panels. The 4 installed wind turbines still provide for the majority of the island’s electrical production and consumption, with both wind farms together making up around 70%, as shown in the table to the right.
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