When it comes to how much you can save with solar, this will vary between households. Below are the factors which can impact your savings.

• System production – The more kWh of energy your solar PV system produces, the more you are likely to save.  However,  system production is not just determined by the system’s size. It also comes down to other factors such as the location of the installation, site conditions (eg. pitch, orientation, direction), and the quality of the components used in the solar installation etc. 
• Energy prices – As energy prices increase, the worth of your kWh production will only grow. Your buyback (sell) rate is also a factor in this equation, as the more you can get for excess solar production, the greater your savings will be and overall return from solar.
• Self-consumption – When you produce solar power, you can either use it yourself first or sell this excess energy back to your energy retailer or the grid. The savings generated from self-consumption are usually greater than selling back to the grid, which is why many homeowners try to maximise their savings by using this method.