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Are you on 3 phase power? If so, it's possible that the CT clamps are configured incorrectly. We had this issue when the PW2 was installed and the installer tried 2 more times before getting the configuration correct! (In South Australia too, by the way).
Yes, we got our Powerwall 2 as part of this project. The electricity supplier (AGL) initially installed Sunverge systems, but they weren't satisfied for reasons that weren't explained, so we were "upgraded" to a Powerwall 2 after 12 months or so.