Grid interactive systems
How grid connected solar power works
A solar module is made up of a group of photovoltaic cells. They consist of 2 layers of silicon wafers which become positively and negatively charged when sunlight hits them. The charge created flows through a circuit of small wires connected to the wafers. DC electricity is produced which flows into an inverter, converting it to 240 V AC mains electricity. This electricity supplies your home appliances, with any surplus being fed back into the main grid. You receive a credit on your energy bill from your electricity provider for the amount you feed in to the grid, in excess of what your household uses. When your system doesn't produce enough power, then you get power from the grid.
Grid interactive systems eliminate the need for a battery backup for when the sun doesn't shine. In effect, the grid serves as your battery. This means that maintenance costs for your system will be less. It should be noted that without battery storage a grid connected system will shut down when there is no power on the grid.
Generally, if you have a grid-connected house with a structurally sound north-facing roof, then you can install a grid-interactive PV system, providing your power utility allows it. In Australia, a growing number of electricity utilities are supportive of grid-interactive systems, and will credit you for your electricity if the amount you generate exceeds the amount you use during the billing period.
Ideally, all electricity systems are best sized to the daily loads, that is; the total number of watts or amps being used in a 24 hour period.
The Benefits of solar power for your home
- Generating your own electricity will help reduce your bills
- Produce clean electricity and reduce the impact of pollution and greenhouse gas emissions
- Add value to your home
- Installing a solar power system helps you to meet energy requirements for new homes (eg. NSW BASIX, 5 star rating systems)
In essence, installing a Grid-Tied Solar System gives you, the owner, the ability to sell excess power generated to the electricity authority during the day when the sun is shining.