Why a 50-amp charger needs a 70-amp circuit
This is the whole page in one calculation, so it is worth doing slowly.
NEC Article 625 treats EV charging as a continuous load — three hours or more of uninterrupted current. Continuous loads get a circuit sized at 125% of the load, which is the same rule people usually quote backwards as “80% of the breaker.” ChargePoint publishes it plainly in the Home Flex datasheet, with its own worked example: a 50-amp breaker for 40-amp output.
Run the same arithmetic at the top of the range. Fifty amps × 1.25 = 62.5 amps. There is no 62.5-amp breaker, so you go to the next standard size up, and that is 70. Autel’s own product page for the 50-amp MaxiCharger states a 70 A circuit required for full output. EVIQO, whose charger ships at 48 amps and can be raised to 50 by changing internal DIP switches, states that the 50-amp setting requires a 70 A circuit where the 48-amp default needs a 60. Nobody is hiding this. It simply never appears in the part of the listing people read.
A 70-amp circuit is a real step up from the 60-amp one a 48-amp charger needs: a larger breaker, heavier conductors, and a bigger bite out of a service that may well not have it to give. If an electrician has already told you the panel is tight, our 100-amp panel roundup and our panel capacity guide are the pages to read before this one, because the answer there is usually a smaller charger rather than a bigger panel.
What 50 amps actually gets you over 48
| Output | Power at 240 V | Circuit required | Range per hour (3.5 mi/kWh) |
|---|
| 40 A | 9.6 kW | 50 A | about 34 miles |
| 48 A | 11.5 kW | 60 A | about 40 miles |
| 50 A | 12 kW | 70 A | about 42 miles |
Two amps. Seventeen miles across a ten-hour night. For that you are buying a heavier circuit and, in a lot of houses, a panel conversation. We think the honest reading is that 50 amps is worth having as a setting— it costs nothing to own a charger that can go there if you ever upgrade the service — and rarely worth engineering the house around today. The 40-amp vs 48-amp comparison works through the rung below this one, where the same logic applies at a much smaller price.
There is also a ceiling you cannot buy past. Many EVs have an onboard AC charger rated at 11.5 kW or less, and several popular ones are limited to about 7.7 kW. The charger never pushes more than the car will accept, so a 12 kW wall unit on a 7.7 kW car charges at 7.7 kW. Check your own car’s figure before you spend anything — our onboard charger limits guide shows where to find it, and this is the most common way people overbuy at this tier.
What separates these five
Whether the 50 amps is a setting or a fixed ceiling.ChargePoint publishes six steps — 16, 24, 32, 40, 48 and 50 A — set in the app. Autel publishes a continuous 16 to 50 A range. Those two are the chargers that survive a change of plan. EVIQO is adjustable 6 to 48 A from the app with a hardware DIP switch capping the maximum at 16, 32, 40 or 48, and the same DIP block is what raises it to 50. The Lectron NEXUS publishes no adjustable range at all, which is why it appears here as a 48-amp pick and not a 50-amp one: it needs a 60-amp circuit and cannot be dialed down to live on anything smaller.
Whether reaching 50 amps means opening the enclosure. This is the EVIQO footnote and it deserves saying out loud. Getting 50 amps out of it is not an app slider; it is a DIP switch inside the unit, which means a cover off and, realistically, the electrician who is already there for the 70-amp circuit. It also puts the charger in a configuration other than the 48-amp one it is sold and listed in. If you want 50 amps as a normal, documented, app-selectable setting, buy the ChargePoint or the Autel. If you want the cheapest hardware that can physically do it, this is it.
The enclosure, and whether a temperature range is published at all. Autel publishes IP65 / NEMA 4X and −40°F to 131°F, the widest range in our registry, which is why it is the pick for a wall with no shelter. EVIQO publishes IP66 / NEMA 4 rated −22°F to 122°F. ChargePoint publishes a NEMA 3R enclosure. The Lectron NEXUS publishes IP66 but nooperating-temperature range — a blank field, which in a cold climate is a finding rather than a detail. Our outdoor roundup is the page for that constraint.
What happens when 70 amps is not available.This is where the Emporia Pro earns its place on a 50-amp page. It is a 48-amp charger, so it is not competing on output — it competes by making the circuit question go away. PowerSmart load management watches the rest of the house and reduces charging speed when everything else is drawing hard, which is the one mechanism on this page that can turn a “you need a service upgrade” quote into a charger purchase. The catch is published and real: it needs Emporia’s Vue energy monitor, a second device to buy and install. Our load-management roundup compares that against the other approaches.
Cable, because it is the spec people regret.Autel, EVIQO and Emporia all publish 25 ft. ChargePoint and the Lectron NEXUS publish 23 ft, and EVIQO adds a 40-inch input lead on top of its 25 ft output cable, which is the longest total reach of the five. Measure the route around the car rather than through it before you decide — the long-cable roundup exists because this is the measurement people get wrong.
What we deliberately left off
The 48-amp field in general. There are more 48-amp chargers in our registry than appear here. The 48-amp roundup ranks that tier properly, and if you have read this far and concluded that 70 amps is not happening in your house, that is the page you actually want. This one is deliberately narrow: it is for people searching for the top of the range and entitled to know what it costs.
The Emporia Level 2.Emporia’s standard 48-amp charger is a frequent top pick elsewhere on this site, but as of the date on this page its Amazon listing shows no buyable offer, so it is not ranked here and the Pro is the Emporia we can price. Our Emporia Level 2 vs Pro comparison covers the difference for anyone who finds the standard model back in stock.
Every plug-in charger. None can appear on this page, and the reason is the receptacle rather than the charger: the largest socket in general household use is a 50-amp NEMA 14-50 or 6-50, 80% of 50 amps is 40, and so every plug-in Level 2 unit stops at 40 amps. Fifty amps is hardwired by definition. Our plug-in roundup and hardwired vs plug-in comparison cover that trade in full.
The verdict
For almost everyone shopping at this tier, buy the ChargePoint Home Flex. Not because 50 amps is the right choice — usually it is not — but because it is the charger that stays right whichever way the electrician’s answer comes back. Six published current steps from 16 to 50 A, the most complete app here, ENERGY STAR for the rebate paperwork, and a three-year warranty. You pay a brand premium, and the Amazon listing our buy link resolves to is the hardwired build — which is the one you want on a 70-amp circuit anyway.
If the charger is going on an exposed wall, buy the Autel MaxiCharger. Fifty amps, a published 16 to 50 A range, an IP65 / NEMA 4X shell rated −40°F to 131°F, a 25 ft cable, and RFID-card authentication if other people can reach it. It is also the manufacturer that states the 70-amp circuit requirement most plainly, which we count in its favor. One caveat: Autel’s Adaptive Load Management “requires compatible additional hardware” that the page does not name, so do not buy it for that feature.
And if the 70-amp circuit is not happening, stop chasing 50 amps. At 48 amps you give up about 1.7 miles of range an hour and you need a 60-amp circuit instead of a 70. Take the Lectron NEXUS if you want a fast charger with no app, account or firmware in the chain, or the Emporia Pro if an electrician has told you the panel has nothing left and PowerSmart is the thing that makes the install possible. Either is a better outcome than a 12 kW charger throttled to 9.6 kW because the circuit behind it was all the house could spare.
