It has a 120 plug, but people have taken it apart and verified that the internals are a dual voltage Clipper Creek. I have used mine on 240 with one of these and can confirm that it does indeed work. You don't get the full speed that the car is capable of out of it, but it is twice as fast as 120.
As others have stated, the Bolt will not charge faster than 12a on 120v. However, if you do indeed have a dedicated circuit with nothing else on it, you can convert it to 240v using the existing wiring just by changing the breaker and outlet. You can then use one of these to plug in your stock EVSE, which will accept 240v just fine. The car will charge at ~3kw, which is faster than 120v 16a anyways.
I'm more worried about whatever adapter you use. You'll want a weatherproof "in use" cover over the outlet that is big enough to fit the plug with the adapter. Might work with a big cover and an adapter like this.
The 240V 6-15r outlet has essentially the same electrical specs as a normal 120V 5-15 outlet. 12A continuous load limit applies to both. Not sure about the factory cable for the Ioniq 5, but the one for my Niro works at 240V with this adapter: BloomGrow 110V / 120V to 220V / 240V Plug Adapter for US (1 PC) https://www.amazon.com/dp/B075FTC9RT/ (similar grow light ballast adapters available cheaper on eBay and AliExpress). If you're comfortable with using a heavy duty extension cord for the 120V factory EVSE, using the same extension with this adapter should be as (un)safe.
I was thinking of making my own one of these 220v cheaters but didn't want to take the chance using it at family members houses. But this one seems to have some overcurrent protection built in.
The only thing needed to plug the OEM Bolt EVSE into it is the Bloom Grow adapter from Amazon. I have one in the car, with some other adapters, and a Lectron Tesla tap, for those just in case situations.
i made my own (as i was connecting to an older 30A circuit for an older welder), but i've seen this one mentioned more than once for people who don't want to make their own:
https://www.amazon.com/BloomGrow-110V-120V-220V-Adapter/dp/B075FTC9RT
and close enough, considering the cost difference.
If you're ok with about 3kw charging, you can use the stock EVSE with one of these and then just get adapters from whatever outlet you plan to plug into to a 6-20.
Sorry wrong one...
https://www.amazon.com/dp/B075FTC9RT/ref=cm_sw_r_cp_apa_glt_fabc_CZ0D7W37XEJ4AZEDNW6T
I dont recommend trying this though, I'm pretty sure the power brick is meant to have a neutral even with the 240v, that's how the europoors do it...
https://www.bluesea.com/support/articles/AC_Circuits/87/Differences_in_USA_and_European_AC_Panels
Your best best is to reconfigure the wall outlet itself.
So if it accepts 240V then I can just buy an adapter to plug it into the dryer outlet?
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something like this?
OP, you've got some bad information on here. A genuine Apple charger is designed to work universally around the world. It will accept anywhere from 100 volts to 240 volts ac current between 50 and 60 hertz. How do you would require is a quality adapter plug it into any outlet in the world that operates within the Apple charger's voltage range.
Proof:
Apple support thread claiming same https://discussions.apple.com/thread/250361447
Apple support page showing the specs of a genuine charger https://support.apple.com/en-us/HT210133
This is a link to an adapter plug that will do what you're asking. Fair warning I've never used this brand of plug so I can't speak to the quality of it.
More importantly if you plug something else into that adapter that's not rated for 240 volts you will likely destroy it and maybe even start a fire. https://www.amazon.com/dp/B075FTC9RT/ref=cm_sw_r_cp_apan_glt_i_T5N31VYE3M6K32S7MVPC
It's really for sale on Amazon. ⭐⭐⭐⭐⭐ More than 100 five star reviews.
Is this what you're looking for?
https://www.amazon.com/dp/B075FTC9RT?ref=ppx_pop_mob_ap_share
Lots of owners do this. Amazon sells various adapters for this purpose, including this one and this one.
I agree that it's off-label use, but there has been pretty significant research into it (see this album). It's also basically the same board that's in the Amazing-e (a UL-listed 240V charger), as shown in this video.
One thing that is abundantly clear is that the adapter is fairly explicitly designed for US-style 240V use. Specifically, it has a check-light for wiring faults, and it absolutely could check that there is negligible potential difference between “neutral” and ground. It does not, because adding such a check would break US 240-volt use (while still being fine in Europe on non-split-phase power).
It's not illegal, and I think if you somehow did burn your house down, it would probably be seen as no more negligent than various other kinds of foolishness that result in the same outcome.
Edit: Add video link.