What solar power system will suit my circumstances?
The average consumption in today’s family households consumes between 20 and 30 KW/h of electricity per day. Single person households can consume less than 10Kw/h per day. Please check the rear of your electricity bill as in many cases it will show average daily consumption.
A 2 to 3 kilowatt system in many areas of Australia can provide about a third to half the electricity needs for a family of four. Our solar calculators on this site lets you work out the best scenario for you in regards to solar system size.
Please keep in mind that when you for example consume 5000 kW/hrs at electricity a year and you choose a system that generates 5000kW/Hrs per year – you will not be bill free. The reason is that you will still pay for the electricity you use at night and during rainy days. The extra electricity your system generates during the day, given the lower feed in tariff nowadays, will not completely cover the cost of the electricity at night.
The arrival of solar storage batteries will now change this paradigm - at least when it comes to offsetting night-time energy use. Your capacity to store power in a battery is at the moment capped at sub 13kW (nett 11kW of storage). At current cost of power, ROIs are 12-15 years - about the life of high quality batteries. Prices however are dropping rapidly and storage capacity is increasing. By the end of 2016 expect a 25% drop in cost per kW of storage plus a doubling of storage capacity compared to the the year's start.
There are long term storage units in development that can store up to 1000kW. They will enable you to store extra solar generated in summer to use in winter and on rainy days. However, they are currently cost prohibitive and large in size and so will remain so for the next 3-5 years at least.