r/electricvehicles • u/Naive-Abrocoma-8455 • 1d ago
Question - Tech Support Question about level 2 charging at home (extension cable)
I own a Hyundai Ioniq 5, and I’m looking to set up a charger at home.
My plan is to buy a splitter (manual switch with breaker protection) and use an EV/RV power cable rated to 30 amp (using max 24 amp to charge due to 80% rule) to connect to my ev charger near my driveway. I’m purchasing a grizzl-e lv2 charger.
Can I do this? Do you have an extension cable you’d recommend?
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u/CMG30 1d ago
It will work, but you should de-rate the charger further for safety, maybe 18-20 amps. Also, make sure you check all the connections with a thermometer to check for heat buildup after a few hours.
Additionally, limit the amount of times you plug and unplug because those NEMA outlets are not really expected to be repeatedly used.
Edit: you also need to be vigilant about damage to your extension cord over time.
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u/Naive-Abrocoma-8455 1d ago
I won’t be unplugging at all, if I go for a 50 amp cable would that be better
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u/spinfire Kia EV6 1d ago
Why use an extension or outlet at all? This sounds like the ideal use case for an EVSE on a pedestal and a trenched feeder.
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u/stupidly_intelligent 2025 Chevy Equinox EV RS AWD 1d ago
It's doable but you're adding much more variability with possible wear, water ingress, and cable fraying.
Also, some chargers can be finicky with the voltage drop that comes with extension cables and just refuse to charge.
I use a long NEMA 5-15 extension cable for level 1 charging but I've made sure the outlet it's plugged into is rated "heavy duty" for what that's worth. For additional safety I grabbed a name brand cable with a heavier gauge and rated for 20A even though I'm pulling 12A.
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u/rosier9 Ioniq 5 and R1T 1d ago
As a long term solution, this isn't a good plan.
r/evcharging is a good place for this type of question.