I'm in Perth. Our feed in tariff changed in July to 10c/kWh between 3pm and 9pm, and 2.5c/kWh at other times. Use tariff is 26.2c/kWh. I'm pretty sure our solar will pay itself back in under 5 years, but we have a 25 year warranty on the panels.
My parents are building outside of Adelaide and they've decided to go off grid (solar + battery + backup generator). Their expected payback period is (iirc) 8 years, with a 10 year warranty on the batteries and a 25 year warranty on the panels. They're expecting to have to run the generator once a year or so.
2.5c isn't great, but 5 years is. Shows its definitely worth it if you've got any kind of load during the day. Are you able to make any use of the peak rates after 3 over there?
From what I hear SA is one of the best places in the country to generate. Optimal temperature for the panels plus lots of sunlight. 8 years seems like nothing with the genny and battery. We tried but couldn't make the numbers work with any kind of decent backup, this was 3 years ago.
My parents are building outside of Adelaide and they've decided to go off grid (solar + battery + backup generator). Their expected payback period is (iirc) 8 years, with a 10 year warranty on the batteries and a 25 year warranty on the panels. They're expecting to have to run the generator once a year or so.