So today (almost our last day) the power has worked really well. Finally know how it works, unfortunately we don't need it again before we get home
That is of course assuming that the car would recharge it between here and Keith so we could have coffee on our last morning. As it is solar today has got us to the point where there will be coffee for breakfast on both of the last days!
I still think there are some improvements that will be useful in Victoria, but up here where it is cloudless and warm we have things sorted.