Short answer
Buy the charger your car can use, then let that charger’s manual set the breaker. EV charging is a continuous load, so the manuals size the breaker at 125 percent of the charging current: 40 A on a 50 A breaker, 48 A on a 60 A breaker. If your car takes 40 A or less, a 40 A charger on a 50 A circuit is all it can use; 48 A pays off only if the car accepts about 11.5 kW and the charger can be hardwired.
The short answer
- Your car sets the ceiling. The charger inside the car decides how much Level 2 power it takes; a bigger wall unit can’t push past it.
- The breaker is 125 percent of the charging current. That is why the manuals pair 40 A with a 50 A breaker, 48 A with 60 A and 80 A with 100 A.
- Plug-in usually means 40 A. Most chargers sold with a NEMA 14-50 plug are limited to 40 A on a 50 A circuit; 48 A and above needs a hardwired install.
Every charger named here is in our Level 2 charger comparison or, for Tesla-plug models, the Tesla and NACS charger comparison. The circuit itself follows your charger’s manual and the electrical code where you live, and your electrician has the final say.
Your car’s onboard charger sets the limit
What it is: a Level 2 charger supplies AC power. The car’s own onboard charger turns it into DC for the battery, and its rating caps how fast the car charges at home, whatever the wall unit can deliver. Natural Resources Canada’s charger basics make the same point.
Why it matters: a regret that comes up again and again in owner forums is paying for a 48 A or 80 A charger, and the heavier circuit it needs, for a car that takes less.
What to look for: your car’s maximum AC (Level 2) charging rate, in kW, in its owner’s manual or spec sheet. Divide by 240 to get amps: the spec sheets we read list 9.6 kW at 40 A, 11.5 kW at 48 A, 12 kW at 50 A and 19.2 kW at 80 A, all at 240 V. On a 208 V supply the same current gives less: Emporia lists 10 kW at 48 A on 208 V.
40 A or 48 A?
What it is: the two most common top settings on home chargers. 48 A is 20 percent more current than 40 A: 11.5 kW against 9.6 kW at 240 V.
Why it matters: the extra 20 percent only shows up if the car accepts it, and it costs more to install. A 48 A setting needs the 60 A breaker its manual lists, with wire to match, where 40 A needs 50 A. On most chargers we track it also means hardwiring, because the plug-in versions stop at 40 A.
What to look for: if your car takes 11.5 kW or more and your panel has room for a 60 A circuit, 48 A is worth having. If it takes 9.6 kW or less, 40 A on a 50 A circuit is just as fast. Chargers that do both let you decide at install time: the Emporia Pro gives 40 A plugged in and 48 A hardwired, the ChargePoint Home Flex 40 A plugged in and up to 50 A hardwired. The Grizzl-E Classic tops out at 40 A even when hardwired, while the Lectron NEXUS (for US buyers only: we found no Canadian safety mark) is fixed at 48 A, so it needs the full 60 A circuit.
The 125 percent rule: why the breaker is bigger than the charger
What it is: the US Department of Energy says EV charging counts as a continuous load under the National Electrical Code (NEC). Section 625.41 sizes the breaker and the wires for 125 percent of that load, and inspection checklists look for it. Chargers sold in both countries use the same ratio: ChargePoint’s guide says the circuit must be rated for 125 percent of the maximum load, and FLO’s, written for the US and Canada, keeps units that share a breaker within 80 percent of its rating, the same rule turned around.
Why it matters: the number on the charger isn’t the number on the breaker. A 48 A setting needs a 60 A breaker; on an existing 50 A circuit, the electrician sets the charger to 40 A instead.
What to look for: the circuit table in your charger’s installation manual. This is how the manuals of our five picks print it:
| Charging setting | Breaker the manual lists | Manuals that print this pair |
|---|---|---|
| 16 A | 20 A | ChargePoint Home Flex, Emporia Pro, FLO Home X6, Grizzl-E Classic |
| 24 A | 30 A | ChargePoint Home Flex, Emporia Pro, FLO Home X6, Grizzl-E Classic |
| 32 A | 40 A | ChargePoint Home Flex, Emporia Pro, FLO Home X6, FLO Home X8, Grizzl-E Classic |
| 40 A | 50 A | ChargePoint Home Flex, Emporia Pro, FLO Home X6, FLO Home X8, Grizzl-E Classic |
| 48 A | 60 A | ChargePoint Home Flex, Emporia Pro, FLO Home X6, FLO Home X8 |
| 50 A | 70 A | ChargePoint Home Flex, FLO Home X6 |
| 56 A | 70 A | FLO Home X8 |
| 64 A | 80 A | FLO Home X8 |
| 72 A | 90 A | FLO Home X8 |
| 80 A | 100 A | FLO Home X8 |
Fifty amps is the odd one out: 125 percent of 50 is 62.5, and ChargePoint and FLO both pair it with a 70 A breaker. Emporia’s table also lists in-between sizes, such as 36 A on 45 A. Sources: the ChargePoint Home Flex installation guide (p. 4), the Emporia Pro install guide (step 4-5), the FLO Home X6 and X8 installation guide (section 6.2) and the Grizzl-E Classic manual (sections 1 and 2.1).
Safety: the sizes above are what each manual lists for each setting, not wiring instructions. A licensed electrician sizes the breaker and wire from your charger’s manual and the electrical code adopted where you live, which differs by state and province, and pulls a permit where one is required. The setting, the breaker and the wire all have to match the manual’s table.
Plug-in or hardwired: the 40 A cap
What it is: many chargers come in a plug-in version for a NEMA 14-50 (or 6-50) outlet, and their manuals cap it below the hardwired maximum:
- ChargePoint Home Flex: plugged in, 32 A on a 40 A circuit or 40 A on 50 A; every other setting is hardwired only. In Canada, the plug-in version is allowed only on a 50 A circuit, at up to 40 A.
- Emporia Classic and Pro: 40 A on the NEMA 14-50 version, 48 A hardwired.
- FLO Home X6: 40 A plugged in on a 50 A breaker; up to 50 A hardwired.
- Enphase IQ EV Charger 2: a 50 A breaker for the plug-in model, run at no more than 80 percent of it (40 A); 48 A hardwired on 60 A.
- Wallbox Pulsar Plus and Lectron NEXUS (for US buyers only: we found no Canadian safety mark): 40 A plug-in versions on a 50 A circuit, 48 A hardwired.
Why it matters: if 40 A covers your car, a plug-in on a properly installed 14-50 outlet does the job; if you want 48 A, plan to hardwire from the start. A plug-in brings its own questions about GFCI breakers and receptacle wear, covered in hardwired vs plug-in EV chargers, and why GFCI breakers trip. In Ontario, the Electrical Safety Authority’s EV charging bulletin says a charger plugged into a 14-50R or 6-50R receptacle must be protected by a 50 A rated overcurrent device (Rule 26-700).
What to look for: the “plug-in max” line on our product pages, and whether the plug-in is its own model (ChargePoint sells 14-50, 6-50 and hardwired versions) or can be converted later (the Grizzl-E Classic’s plug is removable for a hardwired connection).
Adjustable settings: fit the charger to the circuit you have
What it is: most chargers can be turned down to suit a smaller circuit: by a switch inside the cover (Grizzl-E Classic: 16, 24, 32 or 40 A), a rotary switch a licensed electrician sets (FLO), the app behind a PIN (Emporia) or the installer’s app (ChargePoint).
Why it matters: an existing circuit may be enough. ChargePoint’s Canadian FAQ says a dryer outlet usually won’t fit its plug, but an electrician can reuse the circuit for a hardwired install at, say, 24 A on 30 A, with the charger as its only load. The NEC lets the circuit be sized to the set current, under conditions the code lays down (625.42). In Ontario, ESA allows it only on fixed-in-place chargers, set as the manual says, with a permanent label and the setting locked behind a tool or password; your electrician knows whether yours qualifies.
What to look for: the setting range (“amp settings” on our product pages) and the labels: ChargePoint supplies amperage labels for the station and its breaker, and warns that a missing one can fail inspection. Two chargers we track have no lower setting: the Lectron NEXUS is fixed at 48 A (you can only limit current in the car’s settings), and the Leviton EV40P manual describes none below 40 A.
Room to grow: should you buy more charger than your car needs?
What it is: Natural Resources Canada suggests choosing a charger rated for at least 50 A, so it suits faster-charging cars later. The circuit still follows the charger’s manual and the code.
Why it matters: a 50 A charger doesn’t charge today’s car faster than its onboard charger allows, and running it at 50 A needs a 70 A breaker. The headroom only pays off if your next car takes more, or a second driver’s does.
What to look for: an adjustable charger rated 48 A or 50 A, set to whatever today’s circuit allows. If the circuit is upgraded later, the setting goes up with it (ChargePoint describes doing this in its app). Go to 80 A only for a car that takes more than 48 A on AC, and a panel with room for a 100 A circuit, which is what the FLO Home X8 needs for full output.
A full panel: load management instead of an upgrade
What it is: an energy management system (EMS) watches the home’s total draw and slows or pauses the charger when the house is busy. In the US, NFPA notes that Article 625 now lets an EMS limit charger load, and the 2023 NEC added a section on EMS loads (220.70). In Canada, Rule 8-500 lets an EMS control the charger: the charger then counts only up to the EMS limit, or not at all if the EMS monitors the whole service. Quebec’s RBQ issued its own interpretation on load controllers in 2022.
Why it matters: before adding a circuit, the electrician works out whether the panel has room, and permit checklists such as Long Beach’s ask for that load calculation. A surprise service upgrade is how quotes balloon, and load management is often the way around it.
What to look for: load management built in, or an add-on the inspector accepts:
- Emporia Pro: a Vue 3 monitor for the panel comes in the box. The electrician enters the service rating and a guaranteed charge rate from the load calculation, which the charger falls back to if monitoring drops out.
- Schneider Charge: SmartAmp uses two included current sensors on panels rated 200 A or less. Schneider says it can help avoid a service upgrade where the local inspection authority accepts it.
- Tesla Wall Connector and Enphase IQ EV Charger 2: both follow the house load with the maker’s own meter or gateway and sensors in the panel.
- Add-on controllers: devices such as RVE’s DCC-12 (CSA certified, according to RVE), installed by an electrician, switch the charger off when the house nears its limit.
As of November 2026, BC Hydro adds $200 to its charger rebate for a power management device that avoids a service upgrade, and PG&E’s approved rebate list includes load managers. Programs change, so check the program page before you buy (more in our guide to home charger rebates in 2026).
What each budget buys
Budget
Under $450
A basic 40 A or 48 A wall charger, often with no app: you schedule charging in the car, and turning the current down means a switch inside the case, or isn’t possible at all. An app-controlled model or two sits at the top of this band.
Mid-range
$450–$700
Smart 48 A or 50 A chargers with settings from 16 A or lower, plug-in and hardwired versions, an app, and in some cases sharing between two units or a panel monitor for load management in the box. Usually the best value.
Premium
Over $700
Up to 80 A, two cables on one circuit, panel sensors for load management or an electrical brand’s name. Check that the extra is something your car or panel can use: more amps don’t help a car that takes 40 A.
These are US price bands for the charger alone. Canadian prices run higher in Canadian dollars. The installation is a separate bill, and in the owner threads we read, the wire run, panel work and permit drove the total more than the charger did; how to get a home charger installed explains what goes into a quote.
Our top picks
Five chargers from 40 A to 80 A, each with a breaker table in its manual. The Emporia Pro leads: 40 A plugged in or 48 A hardwired, plus load management for a busy panel (Emporia says it is approved for Canada; we track only its US store). The Grizzl-E Classic is the simple 40 A choice on a 50 A circuit (Grizzl-E’s Canadian store doesn’t list it). The FLO Home X8 is for cars that take more than 48 A, and the FLO Home X6 is its 50 A sibling rated to -40°F (-40°C). The ChargePoint Home Flex has no badge but the most install versions; since May 2026 its warranty depends on a ChargePoint-certified installer. We track only Canadian stores for the last three so far. Our full ranking is in the best home EV chargers.
-
Best smart charger
Emporia Pro EV Charger
Panel monitor included: slows charging when the house needs the power
- 48 A max
- 24 ft cable
- 3-yr warranty
No Canada price yet -
Best budget
Grizzl-E Classic 40A
No app, no account: a tough 40 A plug-in charger
- 40 A max
- 24 ft cable
- 3-yr warranty
No Canada price yet -
Best premium
FLO Home X8
Full 80 A output with FLO's -40°F rating and 5-year warranty
- 80 A max
- 25 ft cable
- 5-yr warranty
No US price yet -
Best for cold climates
FLO Home X6
Rated to -40°F with a 5-year warranty, built for hard winters
- 50 A max
- 25 ft cable
- 5-yr warranty
No US price yet -
Most install options
ChargePoint Home Flex
Six current settings to 50 A, plug-in or hardwired, dual-band Wi-Fi
- 50 A max
- 23 ft cable
- 3-yr warranty
How we choose
- Started from what decides the circuit: the car’s limit, the charger’s settings, plug-in caps and the panel.
- Read each charger’s installation manual for its setting and breaker table, and the code summaries published by inspectors, NFPA, ESA and NRCan.
- Checked prices at brand stores and electrical retailers in the US and Canada, and show the date we checked.
- Read owner forums for reported problems. The samples are small, and we say so.
What we don’t do: lab-test chargers, install them or give wiring instructions. Breaker sizes come from the makers’ manuals; your electrician and the local code have the final say.
Amps and breaker questions
What size breaker does a 40 amp EV charger need?
A 50 A breaker, in every manual we read for a 40 A setting: ChargePoint, Emporia, FLO and Grizzl-E all print that pair. Charging is a continuous load, so the circuit is sized at 125 percent of the charging current, and 40 times 1.25 is 50. Your electrician still checks your charger’s own manual and the code where you live before fitting it.
Is a 48 amp charger worth it over a 40 amp one?
Only if your car accepts about 11.5 kW on AC. Then 48 A charges 20 percent faster than 40 A. It also needs a 60 A breaker instead of 50 A, and on most chargers a hardwired install, because plug-in versions stop at 40 A. If your car takes 9.6 kW or less, a 40 A charger is just as fast for it.
Can I use my 30 amp dryer circuit for an EV charger?
Only as the charger’s manual allows, and not by plugging into the dryer outlet with an adapter. ChargePoint, for example, says an electrician can reuse a dryer circuit for a hardwired install at 24 A on the 30 A breaker, but the charger then needs that circuit to itself. Charger makers forbid extension cords and plug adapters, so the electrician fits what the manual lists.
Are the breaker rules different in Canada?
The ratio is the same in the manuals sold in both countries, but each province adopts the Canadian Electrical Code on its own schedule. Ontario’s ESA requires 50 A rated protection for a charger plugged into a 14-50 or 6-50 receptacle, and lets an adjustable setting size the circuit only on fixed-in-place chargers, labelled and with access to the setting restricted. Ask your electrician what your province requires.
Can I install the charger and breaker myself?
Plan on a licensed electrician. Many places require a permit and inspection for a 240 V charger circuit (every install in Ontario and BC), the 2026 NEC requires qualified persons, and Ontario and BC let homeowners do their own wiring only under a permit. Several makers, FLO and ChargePoint among them, tie the warranty to a licensed or certified installer. Our installation guide covers permits by country.
