How to set your EV charger's amps

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The verdict: find your breaker size, multiply by 0.8, and set the charger to the highest published step at or below that number. If the breaker is 60 amps, set 48. If it is 50, set 40. If it is 40, set 32. If you do not know the breaker size, go and look -- it is written on the handle, and guessing is the one thing you must not do here. Everything else on this page is where each maker put the control.

Why 80%, and where the number comes from

EV charging is a continuous load: the charger pulls its full rated current for three or more hours at a stretch. Code therefore sizes the branch circuit at 125% of the charger's rated current, which is why a 48-amp charger needs a 60-amp breaker. Read from the other end -- you already have the breaker and want to know what the charger may be set to -- the same rule is a multiplication by 0.8.

A charger draws its rated current continuously, so the breaker is 125% of it: 16 A needs 20 A, 32 A needs 40 A, 40 A needs 50 A, 48 A needs 60 A, 64 A needs 80 A, 80 A needs 100 A. Breaker and wire size.

Published amperage ranges, charger by charger

Two oddities are worth calling out because they confuse people. The Grizzl-E Ultimate 48A's published step list is 40, 32, 24 and 16 amps -- its own 48-amp rating is not in it, which we flagged when we reviewed it. And the Grizzl-E Classic has no app at all -- United Chargers sells it as a charger whose amperage is set with physical switches rather than software -- so the setting is made on the unit itself. Use the manual that came with yours rather than a figure from the internet, because the hardware has changed across production runs.

The three reasons to turn a charger down

1. 1.The circuit is smaller than the charger. The commonest case, and the reason adjustable chargers exist: a 48-amp unit on a 40-amp circuit set to 32 amps is a correct installation, not a compromise.
2. 2.The breaker or GFCI keeps tripping. Turning the setting down one step is a legitimate diagnostic step and sometimes the permanent fix. Work through GFCI nuisance tripping first, though -- a trip has causes other than current.
3. 3.The panel is full and the house is busy. A lower setting is the manual version of load management. The automatic version is a charger that backs off on its own; load management explained covers both.

What turning it down costs you is less than people expect, because the limit overnight is hours, not amps. At 48 amps a car on a 37 kWh/100 mi rating gains roughly 31 miles an hour; at 32 amps, roughly 21. Over a nine-hour night that is 280 miles against 190 -- and almost nobody drives 190 miles a day. How long to charge at home does that arithmetic properly for your own numbers.

Do not set the limit twice

Most cars can also cap the charging current, and some remember it per location. If you set 32 amps in the car and 32 amps in the charger, you get 32 amps -- fine. If you set 16 in the car months ago and forgot, you get 16 whatever the charger says, and the charger is not broken. Pick one place and keep it there; we would use the charger, because it is the thing that knows about the circuit. The same advice applies to charging schedules, for the same reason. Why is my EV charging slowly starts with exactly this check.

The most adjustable chargers here

Ranked by how much published range the maker gives you, which is what matters if your circuit is the constraint. Live Amazon prices with the date they were read.

1. Homes with an uncertain panel

ChargePoint Home Flex

ChargePoint · J1772 · 50 A / 12 kW · 23 ft cable

The most adjustable unit here. It can be set anywhere from 16 A to 50 A, which makes it the one to buy when you do not yet know what your panel will allow.

What is good

• +Six selectable amperage settings from 16 A to 50 A
• +Sold in both hardwired and NEMA 14-50 versions
• +Rated for indoor or outdoor installation
• +The app is mature and does not require a subscription

What is not

• −23 ft is a foot shorter than the longest cables in this group
• −The 50 A setting needs a bigger circuit than most panels have spare

Published specifications for the ChargePoint Home Flex

Maximum output	50 A / 12 kW at 240 V
Amperage settings	16, 24, 32, 40, 48 or 50 A
Connector	SAE J1772
Cable	23 ft
Installation	Hardwired or NEMA 14-50
Certification	UL listed, Energy Star
Warranty	3 years

Skip this if: Skip it if your circuit is already fixed and you just want the cheapest safe 40 A unit. You are paying for flexibility you will not use.

Specifications above are the manufacturer’s published figures. Source: ChargePoint, ChargePoint. We have not tested this unit — see how we pick.

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2. 80 A with an app and access control

Autel MaxiCharger AC 80A

Autel Energy · J1772 · 80 A / 19.2 kW · 25 ft cable

The connected 80-amp charger: 19.2 kW, adjustable all the way down to 6 A from the app, an RFID card reader and a -40 F to 131 F rating. It asks for a 100 A circuit at full output.

What is good

• +19.2 kW, the ceiling of AC Level 2 charging
• +Adjustable from 6 A to 80 A in the app, so one unit fits almost any circuit
• +Built-in RFID card reader, which is rare outside access-control models
• +Published -40 F to 131 F range, the widest of the 80 A units here
• +Long list of published safety standards plus ENERGY STAR certification

What is not

• −80 A continuous needs a 100 A circuit, which most homes cannot spare
• −Derates above 113 F, so a hot garage will not see the full figure
• −Hardwired only, with no plug-in version
• −4G connectivity is an optional extra, not standard
• −Costs far more than the 48 A chargers most households can actually use

Published specifications for the Autel MaxiCharger AC 80A

Maximum output	19.2 kW (240 V AC x 80 A)
Adjustable	6 A to 80 A, in the app
Voltage	208/240 V AC, 60 Hz, single phase
Connector	SAE J1772 or NACS
Cable	19 ft (6 m) or 25 ft (7.5 m)
Installation	Hardwired; wall or pedestal mount
Enclosure	NEMA 3S, IK10
Operating temperature	-40 F to 131 F, derating above 113 F
Ground fault	20 mA CCID
Access control	Card reader, ISO 15693 and ISO 14443 A/B
Connectivity	Wi-Fi, Ethernet, RS485 and Wi-SUN; 4G optional
Metering	ANSI C12.20 (0.5%) compliant
Size	14.5 x 8.5 x 5.1 in; 20.3 lb with the 19 ft cable
Warranty	3 years, extendable up to 5

Skip this if: Skip it if your panel cannot spare a 100 A circuit or your car tops out at 11.5 kW -- the 48 A tier does the same job for far less.

Specifications above are the manufacturer’s published figures. Source: Autel Energy. We have not tested this unit — see how we pick.

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3. Tight wall space

Wallbox Pulsar Plus

Wallbox · J1772 · 48 A / 11.5 kW · 25 ft cable

The smallest 48 A unit here at roughly 7.8 by 7.9 inches, which matters more than it sounds when the only free wall is beside a door.

What is good

• +Smallest body of the 48 A units, under 8 inches square
• +Current configurable in steps from 6 A to 48 A
• +NEMA Type 4 enclosure, rated down to -22 F
• +Weighs 4.4 lb without the cable, so mounting is simple

What is not

• −Hardwired only at 48 A, with no plug-in version at full output
• −Setup runs through the app, which some owners find fussy

Published specifications for the Wallbox Pulsar Plus

Maximum output	48 A / 11.5 kW at 240 V
Configurable current	6 A to 48 A
Connector	SAE J1772
Cable	25 ft
Body size	7.8 x 7.9 x 3.9 inches without the cable
Operating temperature	-22 F to 104 F
Certification	UL 2594, UL 2231
Warranty	3 years

Skip this if: Skip it if you want a plug-in unit you can take with you. The 48 A Pulsar Plus is hardwired.

Specifications above are the manufacturer’s published figures. Source: Wallbox, Wallbox. We have not tested this unit — see how we pick.

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4. A familiar brand, hardwired

DEWALT 48 A EV Charger (DXPAEV048)

DEWALT · J1772 · 48 A / 11.5 kW · 25 ft cable

A 48 A hardwired charger with a 25 ft cable, an LCD screen and an app, from a brand most garages already trust. Adjustable from 12 A, IP66, CSA certified, three-year warranty.

What is good

• +48 A / 11.5 kW, the top tier a normal 60 A home circuit supports
• +Adjustable from 12 A, a wider floor than most chargers offer
• +25 ft cable with a protective cage and an anti-slip handle
• +An LCD screen on the unit, so basic status does not depend on a phone
• +Scheduling and energy monitoring in a free app, with no subscription
• +A three-year warranty backed by 24/7 technical support, and a national install partner

What is not

• −Hardwired only -- DEWALT's plug-in version is the separate 40 A model
• −DEWALT publishes no operating temperature range for it
• −CSA certified, but DEWALT does not name the standard or publish a file number the way Grizzl-E and Lectron do
• −No ENERGY STAR certification listed, unlike several rivals at this price
• −J1772 only, so a NACS car needs an adapter on every charge
• −Costs more than the 48 A chargers most first-time buyers end up with

Published specifications for the DEWALT 48 A EV Charger (DXPAEV048)

Maximum output	48 A / 11.5 kW
Adjustable	12 A to 48 A
Connector	SAE J1772 (DEWALT notes a Tesla adapter is sold separately)
Cable	25 ft, UL certified, with a protective cage and anti-slip handle
Installation	Hardwired; mounting bracket and hardware included
Enclosure	IP66, described as a NEMA 4X type enclosure
Display	LCD screen on the unit
Connectivity	Bluetooth and Wi-Fi, through the free DEWALT EV Charger app
App features	Start and stop charging, energy monitoring, off-peak scheduling
Certification	CSA certified for indoor and outdoor use
Maker's range claim	Up to 46 miles of range per hour
Warranty	3-year limited, with 24/7 technical support

Skip this if: Skip it if you want a plug-in unit -- this one is hardwired, and DEWALT's plug-in version is the 40 A model. Skip it too if a published temperature range matters to you; DEWALT does not list one.

Specifications above are the manufacturer’s published figures. Source: DEWALT. We have not tested this unit — see how we pick.

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5. Grizzl-E toughness, with an app

Grizzl-E Classic Connect

United Chargers · J1772 · 40 A / 9.6 kW · 25 ft cable

The next-generation Grizzl-E: 40 A on a NEMA 14-50, a 25 ft cable, a UL Type 4 indoor/outdoor rating -- and, unlike the Classic, Wi-Fi and the Grizzl-E Connect app. Sold with a J1772 or NACS cable.

What is good

• +25 ft cable, a foot longer than the Classic Extreme Edition's
• +Wi-Fi app with schedules and charging statistics, which the Classic deliberately lacks
• +UL/cUL listed, with a published file number
• +Rated to run from -22 F to 122 F

What is not

• −40 A ceiling, with no hardwired 48 A version
• −Sold with a NEMA 14-50 plug; the Classic's 6-50 option is not among the Connect listings we found
• −The app needs 2.4 GHz Wi-Fi where the charger is mounted

Published specifications for the Grizzl-E Classic Connect

Maximum output	40 A / 9.6 kW at 240 V (the maker lists 10 kW)
Adjustable	16 A to 40 A
Connector	SAE J1772 or NACS, chosen at purchase
Cable	25 ft (7.6 m)
Plug	NEMA 14-50
Enclosure rating	UL Type 4, indoor and outdoor
Operating temperature	-22 F to 122 F
Size	10.25 x 6.25 x 3.75 in
Connectivity	Wi-Fi (2.4 GHz) and the Grizzl-E Connect app
Certification	UL/cUL, file E510712
Warranty	3 years; 5-year warranty sold separately

Skip this if: Skip it if you wanted a Grizzl-E precisely because it has no app -- the original Classic is still the no-software choice -- or if you want 48 A. The Classic Connect is a 40 A plug-in unit.

Specifications above are the manufacturer’s published figures. Source: United Chargers. We have not tested this unit — see how we pick.

$349.99 · View on Amazon#ad how we are funded · price as of October 17, 2026