I tried going through Origin initially as they do have a sort of lease model but out of frustration I went with a recommended electrician from Tesla for the powerwall. All up for the system it was just shy of 20k, so far we have been off grid 99% of the time and reduced the quarterly powerbill to <$60. Liking it so much seriously considering a 2nd powerwall.
Once i get the car i suspect i can charge it off the solar once the powerwall is charged, this normally occurs by 10-11am in brisbane on an average day.