Matiu-Somes Island Wind and Solar Renewable Energy System Tony Pearson

Brief History of the island Design Criteria Chosen System System Performance Benefits of a combined system Future for Matiu Somes Island

Maori Pa or Fortress Human Quarantine for Early Settlers Internment camp during the world wars Degaussing station for ships during the war Gun defences for Wellington Harbour Animal Quarantine Station Nature and Scientific Reserve

Existing Supplies: Unusable Cable from the Mainland 64 kVA Generator 36 kVA Generator 16 kVA Generator 3 Phase Distribution System Requirements: 5 Houses, 3 motel blocks, campground, Visitors centre and office block 3 full time residents Up to 65 short stay overnight residents Up to 400 day trip visitors Total load of about 25,000 kWhrs per year reducing with efficiency gains. To Provide 11,000 kWhrs per year 65% of their predicted usage.

AnnualJanFebMarAprMayJunJulAugSepOctNovDec Avg Wind Speed m/s Avg Solar radiation kWhrs/sqm/day Resources Predicted Generation

Flow Batteries Lithium Water (Pumped Storage) Lead Acid

Monthly 22 kW 12 kW Weekly (Winter) 58 kW 10 kW Daily (Winter) 136 kW 73 kW Weekly (Summer) 20 kW 16 kW Daily (Summer) 35 kW 32 kW Existing System 4 kW 6 kW Size of solar array required with solar only Size of wind turbine required with wind only

Battery Voltage August – September

Follows the load profile more closely Benefits of a combined system: Evens out the large peaks and troughs of power generation Allows for a smaller battery and generator usage Extends battery life Better match of generation and load

Making use of hydrogen for water heating or cooking Further Reduce Dependency on imported fuels by: Introduction of Electric vehicles Further electrification introduction of low wattage heaters and heat pumps Conversion from gas cooking to electric

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