Kia EV Extension Cable: Which One to Buy by Model Year and Charger

TL;DR — Which Extension Cable Fits Your Kia?

Choose by your Kia model and year (US models):

• 2022–2024 Kia EV6, 2024–2025 EV9, and Niro EV / Niro PHEV through 2026: WenStorm J1772 Extension Cable — from $129.99.
• 2025–2026 Kia EV6 and 2026 EV9: WenStorm NACS Extension Cable — from $169.99.

Before buying: Check your Kia's charging port: J1772 is a larger, round 5-pin inlet, while NACS is a smaller, oval-shaped inlet. Some model years and trims differ (including the 2025 EV6 GT), so confirm the connector matches your existing charger and that your charging equipment supports a vehicle-side extension.

Which situation describes you?

Pick the row that matches your Kia model year, your inlet, and your current charger. The right next step follows.

How to identify your Kia's inlet and included charger

Three checks before buying any extension, in this order:

1. Inlet type by model year. Open the charging door on your Kia and look at the connector shape. J1772 is a round 5-pin connector; NACS (SAE J3400) is a smaller 2-row connector. Model-year mapping is in the table below.
2. Which charger you own. Did Kia include a portable "ICCB" charger when you took delivery? Or did you buy a non-Kia Level 2 EVSE (WenStorm, Grizzl-E, ChargePoint, Emporia, Lectron, etc.) separately? The extension decision depends on this answer.
3. Your EVSE's output amperage. On the EVSE's nameplate or the first page of its data sheet. For the Kia ICCB, this is a Level 1 (120V) unit at 12A by default; a Kia-sold 240V adapter accessory may raise this. For a WenStorm Level 2 Portable, it is 32A on 240V. The extension's rating must meet or exceed your EVSE's output.

Kia model-year inlet mapping (US market, verified against Kia USA sources)

Kia USA offers a NACS-to-CCS1 adapter (part ARSND916B4DIO) for compatible NACS DC fast charging only, not NACS AC charging. Eligible 2024 EV6 and 2024–2025 EV9 buyers who took delivery on or after September 4, 2024 were offered this adapter complimentary. The adapter does not change your Kia's inlet type for AC home charging purposes — the extension cable you need matches the inlet, not the adapter.

Why the ICCB versus third-party EVSE distinction matters

Kia's prohibition is specific to the ICCB (the "In-Cable Control Box" portable charger Kia ships with every US-market EV). The owner's manual language is unambiguous:

"Do not use this with an extension cord.". Kia USA 2026 EV owner's manual, ICCB section.

A WenStorm J1772 or NACS extension cable sits between an EVSE and the vehicle's inlet. If the EVSE in that path is a Kia ICCB, Kia's prohibition applies and no extension is appropriate. If the EVSE is a non-Kia Level 2 unit whose manufacturer permits extensions (confirmed in its manual), then the extension is a vehicle-side cable choice independent of Kia's ICCB policy.

In practical terms, Kia EV owners who need more charging reach have three honest options:

1. Upgrade from the Kia ICCB to a non-Kia Level 2 EVSE whose manual permits extensions. Then add a matched WenStorm extension.
2. Hire an electrician to extend the branch circuit so the ICCB plugs in closer to the parking spot.
3. Change the parking position so the ICCB's own 20-foot cable reaches without an extension.

Which WenStorm extension to buy, by Kia inlet type

Only pick the extension that matches your Kia's inlet. If you have the wrong one, the connector will not mate.

WenStorm sells both extension cables featured below. WenStorm is not affiliated with Kia.

For J1772-inlet Kias (2022–2024 EV6, 2024–2025 EV9, 2022–2026 Niro EV, Niro PHEV)

J1772 · UL 2263 cable

Extension Cable · 32A or 50A · 21 to 50 ft

WenStorm J1772 EV Extension Cable for Level 2 Charging

Carries your EVSE’s full rated current to a J1772 inlet further from your charger. Cable stock certified under UL 2263 (UL-US-2407470-0, models EVE/EVJE).

32A or 50A 240V 21–50 ft

Match the variant to your EVSE’s max output amperage

32A/21 ft uses 10 AWG; 50A variants use 2×8 AWG + 10 AWG ground

Connectors rated for 10,000+ no-load mate/unmate cycles; IP66

Price

$129.99

Get the Extension

2-year warranty · TPU jacket · 6 variants (32A/50A × 21–50 ft)

For NACS-inlet Kias (2025–2026 EV6 standard trims and 2026 EV9)

NACS → NACS

Extension Cable · 50A · 21 to 50 ft

WenStorm Tesla/NACS Extension Cord

50A pass-through NACS extension cable — adds vehicle-side reach when your charger or outlet is too far from the car.

50A 240V 21–50 ft

Pass-through NACS signaling for Tesla and NACS EVs

Heavy-gauge copper conductors

Five lengths available (21/25/30/40/50 ft)

Price

$169.99

Get the Extension

2-year warranty · NACS-to-NACS · 50A

Both products are vehicle-side extensions. Both require a non-Kia Level 2 EVSE whose manual permits extensions. See the next section for which EVSEs qualify.

Which EVSEs permit extensions (and which do not)

Before buying any extension for a Kia, read the owner's manual of your specific EVSE and confirm the extension-cord policy. Common EVSEs and their published positions:

• Kia ICCB (included portable charger). Prohibits extensions per Kia's 2026 EV owner's manual. The prohibition applies to any Kia-included portable charger across model years.
• Tesla Wall Connector and Tesla Mobile Connector. Both prohibit extensions per Tesla's current charging documentation. If you own a Tesla EVSE and drive a Kia, upgrade to a non-Tesla EVSE before adding any extension.
• WenStorm Level 2 Portable (32A, NEMA 14-50, J1772 or NACS variant). Permits extensions when the extension is rated at or above the EVSE's 32A output. Pair with the matching WenStorm J1772 or NACS extension by inlet.
• ChargePoint Home Flex, Grizzl-E, and some other hardwired units. Several non-Tesla manufacturers also publish extension-cord restrictions. Read your product's current manual rather than relying on a general statement.
• Hardwired EVSEs rated at 48 amps or more. Many installation manuals in this category exclude extensions entirely. At the cable's maximum rating, there is no safety margin for an extension's added connector resistance.

When a Kia extension purchase is NOT the right fix

Six situations call for a different solution than buying a WenStorm extension for your Kia:

• You use the Kia ICCB. Kia's own documentation prohibits extensions. No WenStorm (or any brand) extension is appropriate in this path. See the three honest options above.
• You cannot confirm your EVSE's extension-cord policy. If the EVSE manual is lost or the nameplate is unreadable, contact the EVSE manufacturer's support with the serial number and ask for the written policy. Buying an extension for a prohibited EVSE is a warranty and safety problem that is cheaper to prevent.
• You own a 2026 EV6 GT or late-model Niro EV and cannot confirm the inlet type. Verify the connector shape in person at your Kia dealer or at delivery. Model-year mapping is close but not every trim transitions on the same date. Buying the wrong inlet-type extension gives you a cable that will not mate.
• You use the Kia NACS-to-CCS1 adapter at a Tesla Supercharger or Electrify America NACS DC fast charger. DC fast-charging stations use cables with different internal construction (often liquid-cooled); no AC Level 2 extension is compatible. See our Can I Extend a Supercharger Cable? guide.
• You need to extend the wall-outlet side of a portable EVSE. Our J1772 and NACS extensions are vehicle-side cables. Extending a NEMA 14-50 or TT-30 outlet with a dryer-cord or RV-cord extension is a different product category and typically unsupported by both Kia and extension-cable certifications. See our Outlet-Side vs. Vehicle-Side EV Extension guide.
• Your parking is a shared-metered or landlord-controlled space. An extension cable running across walkways, doorways, or property boundaries creates a trip hazard and often a lease-code violation. Resolve the parking arrangement with the property manager before buying extension hardware.

Related reading

• J1772 Extension Cable Buying Guide: Which One Fits Your Charging Setup? — variant selection for J1772-inlet Kias (through 2024).
• NACS Extension Cord Buying Guide: What to Check Before You Buy. variant selection for 2025+ NACS-inlet Kias.
• Outlet-Side vs. Vehicle-Side EV Extension — which side of your charging path needs reach.
• Extension Cable vs. Longer-Cable Charger. when the right fix is replacing the EVSE rather than extending it.
• EV Extension Cable Buyer's Guide: J1772 vs NACS, Length, and What Not to Do — umbrella guide.

Frequently asked questions

Can I use any extension cable with my Kia if my EVSE's manual says it is OK?

Only if your EVSE is not the Kia ICCB. Kia's prohibition is on the ICCB itself. If you have replaced the ICCB with a non-Kia Level 2 EVSE (for example, the WenStorm Level 2 Portable at 32A) and that EVSE's manual permits extensions, then a WenStorm vehicle-side extension matching your Kia's inlet is appropriate.

My 2024 EV6 came with the NACS-to-CCS1 adapter. Does that change which extension I need?

No. The adapter is for compatible NACS DC fast charging, not AC charging. Your home-charging path is still J1772 on the vehicle side because your 2024 EV6 has a J1772 inlet. A WenStorm J1772 extension is correct for home charging; the NACS extension is not.

I have a Kia Niro PHEV. Do I need the same extension as the Niro EV?

If you are using the Kia-included portable charger, no extension is appropriate because of Kia's prohibition. If you have a non-Kia Level 2 EVSE at your Niro PHEV's J1772 inlet, the WenStorm J1772 extension's 32A variant is sufficient: the Niro PHEV's onboard charger accepts less than 32A, so no 50A variant is needed unless your parking distance pushes beyond 21 feet.

Will a WenStorm extension work with the Kia NACS-to-CCS1 adapter at a public NACS pedestal?

No. Kia's NACS-to-CCS1 adapter is a DC fast-charging accessory, not an AC adapter, and WenStorm vehicle-side AC extensions cannot be used for DC fast charging, as covered in our Supercharger extension guide.

Where to verify these claims

Every citable claim above is linked inline to its primary source. Four references apply broadly to this article:

• Kia USA 2026 EV owner's manual: ICCB section. Authoritative for Kia's extension-cord prohibition on the included portable charger.
• Kia USA parts site. Authoritative for the NACS-to-CCS1 adapter (part ARSND916B4DIO) and current OEM accessory availability.
• WenStorm. J1772 EV Extension Cable and WenStorm — Tesla/NACS Extension Cord. Authoritative for current variant lengths, pricing, and ratings.
• Your EVSE's current owner's manual from the manufacturer's support site. Authoritative for extension-cord policy on your specific EVSE. The manufacturer's position supersedes any general guidance on this page.