Electronics > Beginners
240V to 120V Step-Down Transformer
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bigbadwolv:
Hi all,

Please feel free to move this if it isn't in the correct place (I just figured it is a rather n00b question ;)).

I am from Aus, and recently purchased a robot vacuum from the US (Shark IQ R1001AE). I stupidly assumed that it would be like many other products and accept both 120V and 240V. Now I am in the predicament of needing a 240V to 120V Step-Down Transformer. The dock (according to the label) requires input of 120V 60Hz 650W.

These shouldn't be too difficult to find but I want to make sure what I purchase is both safe for the device and my family. Can you recommend any reputable brands or products?

I hope I gave all the info required. If not please don't hesitate to ask for the details required.

TIA, Wolv
andy3055:
You will be better off buying one in Australia rather than lugging it from here. All you need is something that is either 650 Watt or higher, given the charger draws 650 Watt.
tunk:
You might be able to modify it:
https://www.eevblog.com/forum/beginners/converting-a-cordless-drill-charger-%28hitachi-uc18yksl%29-from-110v-to-220v/
Zero999:
A transformer won't change the frequency, although that shouldn't matter.

I can't recommend any specific brands. I'd just go to a known good electronic/electrical distributor and buy one. An autotransformer will be fine, since it doesn't need isolation and will be smaller and cheaper than an isolating transformer. It would be a good idea to use a transformer with a slightly higher power rating than the vacuum, just to be safe, so 750VA or bigger will be fine.
james_s:
650W?? Surely that's a typo? My Roomba charging docks draw at least an order of magnitude less than that.
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