In Sydney 1kW of solar will generate approx. 4.5kWh of energy per day. If your daily energy usage is 20kWh then you just divide 20 (your daily average) by 4.5 (kWh produced daily) and this will give you the size of the system you need to meet your needs, in this case it equates to a 4.4kW solar system.

Don’t just base your size decision on your current lifestyle conditions, it’s important to forward plan. Is your family growing? Are you considering a pool or air conditioning in the future? Is an electric car on your wish list?

Something else to consider when choosing the right size of your solar system is your roof structure. You will be limited by how many solar panels will actually fit on your roof and where they can be positioned.

In Sydney, North facing roofs are the ideal aspect for a solar panel array. Although it sounds straight forward, there are times when east or west facing roofs are preferred depending on what time of the day you will need to generate power. East and West facing roofs will generate less power than a North facing roof overall but it’s not all about peak power. It’s more important to use what you make efficiently than to make more.

If you do generate more energy than you use you can sell it back to the grid OR you may like to consider a battery storage system, this option is becoming more and more popular. Rather than sell your excess energy back to the grid it can be stored in a solar battery. Solar batteries work by storing the energy that is produced by your solar panels and storing it for later use. Excess energy will only go back to the grid if your battery is full.

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