It seems particularly impressive when you consider that in Sydney and Perth, time-of-use tariffs can go to 50c per kWh during peak periods.
That’s 23c for electricity from a battery vs. 50c for grid electricity. Surely that makes the Powerwall 2 a no-brainer investment for people on such a tariff?
I decided to look a little deeper into the economics of using Australia’s cheapest battery2, on Australia’s highest grid tariffs. Unfortunately I found that high peak rates are not nearly as good for the economics of the Powerwall 2 as they seem.