How does grid interactive solar power work?

When the sun is shining solar modules generate electricity. When power is being produced by the solar modules, the grid connect inverter will convert the DC electricity produced by the modules into 240V AC 50Hz electricity, which will then be used by the property/household. If the system is producing more power than is being consumed, the surplus will be fed into the mains power grid. Some electricity companies will meter the electricity fed into the grid by your system and provide a credit on your bill. Other companies will install a bi-directional meter which will run backwards as your system feeds electricity into the grid. When the solar modules are not producing power, for example at night, your power is supplied by the mains power grid as usual. The energy retailer charges for the power used.

1. Sun shines on the solar panels generating DC electricity
2. The DC electricity is fed into an inverter which converts it to 240V 50Hz AC electricity.
3. The 240V AC electricity is used to power appliances in your home.
4. Surplus electricity is fed back into the main grid.

Installing a grid connect solar system
Most customers choose a roof mounted solar system. For most of Australia, the modules should be north facing. The installer will aim to install the modules at an angle which ensures that the glass face of the modules is positioned at 90 degrees to the sun for most of the day. As an example, in Sydney this angle would be approximately 30-40 degrees to the horizontal. Standard Australian roofs usually have an angle of elevation of ~22 degrees, which is acceptable. This provides a close approximation to the position in which a solar array produces its maximum output. For installations on flat roofs an elevated array frame allows the solar modules to be installed at an angle of elevation of approximately 30 degrees from the horizontal.

Back to Solar Energy Home