ELEMENT:
'Enviropower' cells with a 1.44kW capacity system
AIM:
The site receives an average of 7 hours of sunshine a day. Using sunlight
to generate electricity reduces the demand on the public electricity supply
system on the Gold Coast and results in a reduction of greenhouse gas
emissions.
For every kilowatt hour produced by the photovoltaic (PV) system, the
CO2 emissions from the house will be reduced by around 1.4
kg.
STRATEGY:
Minimise the Use of New Resources
The site receives an average of 7 hours of sunshine a day. The solar loads
can be as high as 1000 W per m2. By harnessing the energy produced by
solar means for the operation of the house ensures that there is less
demand for electrical supply from the local grid system.
A grid tied PV system with an inverter is installed on the roof of the
house facing north to generate 240 volt electricity. This is fed directly
into the grid and no power is diverted for house consumption.
The system is connected to the mains power though an inverter. The inverted
converts the DC energy produced by the PV system into AC which is compatible
with the existing mains power.
A meter is used to monitor the power provided to the grid. The energy
carrier pays about $0.28 per kWh for the energy up to a maximum of 1000
kW hrs. Electricity consumed in the home is fed directly into the home
and is separately metered and purchased at a cost of $0.6 - 0.12 per kW/hr.
The cost of the electricity is based on Energex Tariff 11 for Residential
usage where the first 100 kWh per month is 17.622c per kWh. The next 300
kWh per month is 11.968c per kWh and the remainder is 10.681c per kWh.
The system design is integrated with the roof to an optimum angle of
35 degrees to maximise power generation. The system is designed to make
the building grid neutral, that is, it uses as much as it generates. The
economics of the buy back scheme do not seem to be passing the savings
back to the owner. No energy storage system is used.
REFERENCE:
www.energex.com.au
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