Our September's since our 6.81 kW array went live,
Sep 13: 943
Sep 14: 889
Sep 15: 823
Sep 16: 910
Sep 17: 812
Sep 18: 766
Our total since 12/17/12: 57757 kWh as of 11/11/18. By my calculations, we are 72.393% paid back. Some would say that the payback is too long to be worthwhile, but I always point out that I've been paying my electric bill far longer than that and they have yet to tell me I am paid in full.
Between the solar arrays and the Bolt, I am saving a good bit of money from utilties and gasoline.