A warning to other users: the adapter that Loren linked is NOT suitable for Rachio. Rachio requires an AC-AC adapter. What Loren linked is AC-DC and will cause issues with your Solenoids (I learnt the hard way).
Refer to this thread:
In Australia, searching Google for “AC2410” should get you what you want. Here are some I found (yet to receive one to verify):
Indeed. It is VERY IMPORTANT to be using a 24v AC psu and NOT a 24v DC psu
Thanks for posting this.
What about the issue with 110 - 120V in America vs 220-240V in Australia? I am reading something about needing a step down transformer.
@Syrathos , a step down transformer is only required if you plan to use an adapter which does not support 240v input (e.g. the original US adapter).
In my case I purchased an entirely new adapter, suited for 220-240V input, which outputs the correct voltage required by Rachio (24v AC 1amp). Thus no extra transformers are required.
Refer to the AC2410 links above for examples
Ah that makes much more sense! Thanks so much.
I just set up my 16-zone Rachio 3 today. I used the weather proof enclosure and installed the 240VAC / 24VAC transformer from my old watering system into the enclosure. For some reason I had to order the controller from amazon.com and the enclosure from amazon.com.au. All good except that the iOS app got confused about my time zone during initial set up. To set a zone to start at a specific time, say, 7:45pm, I had to set the time to 6:15am. Once this happened, I swapped to the web page to do the set up and now all is well. Even the app is behaving well now. It was almost as though some parts off the app hadn’t realised what time zone I was in during the initial setup. (I am in the +10:30 time zone).
Hey!
You mentioned you bought the enclosure from amazon.com.au, did it come internationally? My one that came from UK appears to be the US one, ie the enclosure’s socket is in American format.
I am wondering how you went with hardwiring to the enclosure’s socket, as these sockets are probably only rated for 120v (as they’re American). Did you have any issues hardwiring to yours if yours is an American plug? just not sure if its safe to hardwire 240v to an american 120v plug.
@PIS7OL it seems you also were successful in wiring 240v to the enclosure plug? wondering if theres anything i should look out for given american sockets might not be rated for 240v:
Just following up on this: After buying the enclosure with the American outlet, I got it swapped over for an Aus plug by an electrician. They charged far too much and really I should’ve DIY’d it, but am not very electrically knowledgeable. Works well enough 
Rachio, surely just create an enclosure for Aus customers!