I made one of these adapters and it did work. My Hyundai charger is model 91670-K4020. The link I listed for the manufactures website does list the Kona for 2 other model #. My under standing is that Hyundai uses the same charger in Europe (230 volt) and North America (120 volt) Below is the list from the website.
EV Bulletin - List of
EVDOUBLER™ 240V Compatible Vehicles
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Just Plug-in & Charge in ½ the Time
rev 200207
List of 2016 - 2020 Compatible Vehicles and Chargers (and older)
Do not use if your vehicle is not listed - Get an upgrade Instead
Now Free EVDOUBLER for 2020 (and other) models not listed below (limit 1)
Vehicle
Vehicle Model
*Look for Charger Model # on the Label
Chevrolet
Bolt, Volt, Spark*
2016 -2020* Voltec GM 23254904, 23254905, GM Cordset #E346031
Chevrolet
Bolt, Volt, Spark (older)*
24277224, 24280118, 24288872, 24291478,22967199, 22940501:
Chrysler
Pacifica
All 2016 - 2019
Fiat
500e
All 2013 - 2019
Ford Fusion
Focus, C-Max, Energi*
2014-2019* Check Model # FoMoCo: FM58-10B706AG (or AH, or AJ):
Honda
Clarity*
Check Model* # 1T210-5WJ-A0
Hyundai
Ioniq, Sonata, Kona*
2015 - 2019* Check Model # 91887-G7520, YURA , also 91670-K4020
Kia
Niro, Optima, Soul*
2017 - ?* check Model 91887 -G5520
Nissan LEAF
Upgrade recommended
2016 - 2019 Check Model # 296090 3NF2E, Panasonic
Smart Car
ED, ForTwo, ForFour*
2013-2019* 117148 3015008, some older 2013
Toyota
Prius, Prius Prime*
* Check Model # G9060-47130 or G9060-47190
Tesla
All models (Gen 2)
Works with Gen 2 Mobile Connector and NEMA 5-15 120V adapter
Duosida
120V 16A
All 2016 - 2019
FREE EVDOUBLER for all 2020 EV/PHEVs including these new ones - Audi, BMW, Byton, Citroen, DS 3 Crossback, Jaguar, Lexus, Light Year One, Lucid Air, Mercedes, MG ZS, Mitsubishi, Mini Cooper, Opel, Peugeot, Polestar, Porsch, Renault, SEAT Mii, Sion, Skoda, Volvo, VW (Limit 1)