Why there is no such thing as a 30-amp charger
Thirty amps is a circuit size. It is what the wire and the breaker are rated for. Charger makers build to the amperage the charger will actually deliver, and because of the 80% rule those two numbers are never the same. A 40-amp charger wants a 50-amp circuit; a 48-amp charger wants a 60. Run it the other way and a 30-amp circuit supports a 24-amp charger — and 24 is not a rating anyone sells either, because nobody would buy a box labeled “24 amps” when the same box can be labeled 40 and configured down.
So the market solves this with configuration rather than product. The good manufacturers publish a list of amperage steps their unit can be set to, and 24 is almost always on it. The step is set either in software, or with a physical DIP switch inside the enclosure. The whole job of this page is to record who publishes that step, and to exclude everyone who does not.
The four chargers in our registry whose makers publish a 24-amp setting — the most a 30-amp circuit may carry continuously. Every one of them can also be hardwired, which matters here: you cannot legally fit a 50-amp receptacle to a 30-amp circuit, so the plug-in route is closed.| Charger | Published amp settings | Rated max | Install | Cable | Enclosure |
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| Grizzl-E Ultimate 48A | DIP switch: 16 / 24 / 32 / 40 / 48 A | 48 A | Hardwired | 25 ft | NEMA 4 (IP67) |
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| ChargePoint Home Flex | In the app: 16 / 24 / 32 / 40 / 48 / 50 A | 50 A | Hardwired, NEMA 6-50 or NEMA 14-50 | 23 ft | NEMA 3R |
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| Autel MaxiCharger Home | In the app: adjustable 16-50 A | 50 A | Hardwired | 25 ft | IP65 / NEMA 4X |
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| Autel MaxiCharger 80A | App 6-80 A; DIP 16 / 24 / 32 / 40 / 48 / 50 / 64 / 72 / 80 A | 80 A | Hardwired | 25 ft | NEMA 3S (IK10) |
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Three registry units that look like candidates are deliberately absent. The EVIQO 48A, the Lectron Nexus 48A and the Emporia Pro are all hardwired units we rate highly elsewhere, but none of their makers publishes an adjustable amperage range. They may well support a 24-amp configuration; we are not going to put them on a page about a specific setting on the assumption that they do. If you are drawn to one of them, ask the seller to confirm the setting in writing before the electrician arrives.
The constraint that closes the plug-in route
This is the part that surprises people, and it is worth being precise about because it eliminates about half of our registry. Every plug-in charger we track terminates in a NEMA 14-50plug. That is a 50-amp device, and it belongs on a 50-amp circuit — a receptacle serving a single outlet on an individual branch circuit has to be rated for the circuit it is on. You cannot fit a 14-50 receptacle to a 30-amp circuit and call it done, and you should be wary of anyone who offers to.
That leaves two legitimate paths on a 30-amp circuit: hardwire a dial-down-capable charger, which is what the four picks above are for, or fit a NEMA 14-30 receptacleand find a charger that plugs into it — and here is the honest finding: no charger in our registry publishes a NEMA 14-30 plug option. Not one. The adapter market fills that gap, and our dryer-outlet page deals with it at length rather than in a footnote, because the answer there has more caveats than a roundup can carry.
The practical consequence is that a 30-amp install is an electrician job either way. If you were hoping to avoid one, price a 50-amp circuit at the same time: the incremental cost of heavier wire on a short run is often small, and it buys you the plug-in route, a charger you can take with you, and 40 amps instead of 24. Our installation cost breakdown has the line items, and wire size and breaker covers what changes between the two.
What 24 amps actually gets you
Numbers first, with our assumption printed. At 24 amps and 240 volts a charger delivers 5.76 kW. On a reference EV doing 3.5 miles per kWh that is about 20 miles of range per hour, or roughly 160 miles over an eight-hour night. Those are our figures from the voltage and current, not a manufacturer claim, and real-world efficiency moves them either way — a heavy truck in winter does considerably worse, a small sedan in mild weather better.
Set that against how people actually drive. The average US driver covers well under 40 miles a day, which a 30-amp circuit replaces in about two hours. For the overwhelming majority of households, 24 amps is not a compromise at all — the car is parked for ten hours and needs three of them. Our charger-sizing guide works this from first principles, and is a Level 2 charger worth it is the page to read if you are wondering whether to spend anything at all.
Where 24 amps genuinely pinches is a large battery from near-empty. An 84 kWh pack takes around 13 hours at 5.76 kW against about 7 on a 48-amp charger. If you regularly arrive home nearly flat with a big battery and leave early, that gap is real and a bigger circuit is worth the money. If you top up 30 or 40 miles a night like most owners, you will never notice it. The other case to think about is two EVs: 24 amps split between two cars is slow enough to matter, and our two-car roundup covers the alternatives.
The picks, in plain terms
The Grizzl-E Ultimate 48A is our pick because its amperage control is the most honest form of it: a DIP switch with a printed 24-amp position, no account, no app, no firmware that can forget the setting. It is a cast-aluminum, IP67-sealed body rated to -22°F with a 25-foot cable built to stay flexible in the cold, and it is hardwired, which is what a 30-amp circuit needs anyway. Two honest notes: Grizzl-E publishes no WiFi or app for this SKU, so you schedule in the car, and its Amazon listing went dark for five weeks in 2026, so stock can be patchy. See the Ultimate review.
The ChargePoint Home Flex is the pick if you would rather set the amperage in software. Its published steps are 16, 24, 32, 40, 48 and 50 amps, and because it can be hardwired orplugged in, it is the one unit here that moves with you if you later upgrade to a 50-amp circuit — you change the setting in the app rather than the hardware on the wall. It is premium money for that flexibility, plus the most mature app in the category and a UL/cUL listing with ENERGY STAR. The Home Flex review has the detail.
The Autel MaxiCharger Homeis the pick when the charger has to live outside. Adjustable 16 to 50 amps in the app, in an IP65 / NEMA 4X enclosure — 4X is the rating that adds corrosion resistance — with a published operating range of -40°F to 131°F, the widest we track, and WiFi, Bluetooth and Ethernet on board. One figure to read carefully: Autel states a 70-amp circuit is required for its full output. On a 30-amp circuit set to 24 amps that is irrelevant, but it tells you this unit’s headline number is a much bigger electrical job than the box implies. The MaxiCharger review covers it.
The Autel MaxiCharger 80Ais on this page for exactly one buyer: someone on 30 amps today who knows a service upgrade is coming. Its range is the widest published of anything we track — 6 to 80 amps in the app, with a DIP switch carrying 24 amps among its positions — and it is the only charger that spans a 30-amp circuit and a 100-amp one. It also publishes the longest warranty we have found, five years on the body and backplate with one year on the cable and connector on Autel’s own US store listing. For anyone not planning that upgrade it is a great deal of money for 24 amps, and we would buy the Grizzl-E instead. The 80A review and our fastest-chargers roundup are where it properly belongs.
Before you buy: three things to confirm
One: confirm the circuit is actually 30 amps and actually spare.A 30-amp double-pole breaker in the panel is not the same as a 30-amp circuit run to where the car parks, and an existing dryer or welder circuit is not spare — EV charging equipment needs its own. Our dedicated-circuit page explains why the clever workarounds do not survive contact with the code, and panel capacity shows how to check what you have.
Two: get the 24-amp setting in writing.On the DIP-switch units the setting is physically inside a sealed enclosure, and once the cover is on you will not see it again. Ask the electrician to note the configured amperage on the invoice. It is the single most useful line on that piece of paper if the charger ever misbehaves — and a wrong setting is a common cause.
Three: price the 50-amp alternative at the same time.You are paying for a trip, a permit and labor either way, and the wire is often the smallest line on the quote. If upgrading the circuit is within a few hundred dollars, it buys 40 amps, the plug-in route and a far wider choice of charger — including everything on our 40-amp roundup and our plug-in roundup. If it is not, dial a good charger down to 24 and sleep soundly; the car will be full in the morning either way.
