[magicbuzz]

The all-in-one 3kW inverter/controller that he uses is for 110V AC output (using the 48V battery). In the article he linked to, the system uses an EG4 3000EHV-48 that also outputs 110V AC.

Are there equivalent all-in-ones that would provide 230/240V AC for use in Australia/New Zealand?

[avar]

If you search for the manufacturer shown (PowMr) it looks like they make both 110v and 220v variants.

This looks to be the same or similar product for 220v: https://a.aliexpress.com/_EwlP4Cf

[mcbishop]

I think this is single phase. 230V is a common single-phase voltage outside North America.

[mcbishop]

I don't know of a 3kW inverter that outputs split phase. But you could get the higher-rated EG4 6000XP.

[Scoundreller]

AU/NZ 240V wouldn't be split phase