The WOLFBOX PE40 is the portable to buy if you want one unit to cover both home and the road. It ships with both a 240-volt NEMA 14-50 and a 120-volt 5-15 plug adapter, its current adjusts from 6 to 40 amps, it adds a delay timer for off-peak charging, and it is ETL certified with an IP66 weather rating. It is our top pick in the best portable EV chargers, and this is why.
What it is
The WOLFBOX is a portable Level 2 EVSE with a J1772 connector - the standard plug for non-Tesla EVs in North America, and one a Tesla can use with a simple adapter. "Portable" here means it is not bolted to the wall: it plugs into an outlet, hangs on a hook or sits in a bag, and moves with you (WOLFBOX also sells it with a wall bracket if you want to mount it). What sets it apart from most rivals is that it is genuinely dual-level, shipping with two plug adapters in the box rather than assuming you always have a 240-volt outlet handy.
Dual-level: the 14-50 and 5-15 plug adapters
This is the headline feature. With the 14-50 adapter, the WOLFBOX pulls 240 volts and charges at Level 2 speed - roughly 25 miles of range per hour at its full draw, enough to refill overnight. Swap to the included 5-15 adapter and it steps down to a standard 120-volt household outlet, adding a slow trickle when that is the only thing available. The 120-volt mode is not fast - Level 1 adds only about 3 to 5 miles per hour - but it means you are never stranded at a relative's house, a rental, or an older property with no 240-volt outlet.
Adjustable amperage and a delay timer
The WOLFBOX's current is adjustable from 6 up to 40 amps, set with physical buttons that keep working in rain, snow or freezing cold. The whole point of a portable is plugging into outlets you did not install yourself, and being able to dial the draw down lets you run safely on a smaller circuit or an outlet you are not fully confident in. It also has a built-in delay timer, so you can start the charge on cheaper overnight rates without any app or account - the one genuinely useful "smart" feature, captured in hardware.
Build, cable and safety listing
It is ETL certified with an IP66weather rating and an aluminum-alloy housing, on a long 25-foot cable that reaches across a two-car garage. The ETL listing is the spec that matters most on a charger that pulls 40 amps continuously for hours - a real, independent safety listing, not a vague "certified" badge. It packs into a trunk, which is the entire pitch: a travel charger you can take on a road trip, not just a wall unit that happens to be unmounted.
Where it falls short
Two honest caveats. First, it is a portable, which means it is a brick that lives on the floor or a hook rather than a clean wall-mounted fixture; if a tidy permanent install is what you want, this is not it. Second, a 40-amp continuous draw is a real load, and running it flat out demands a properly rated 14-50 receptacle - do not push it to 40 amps on a worn or bargain-grade outlet. It also has no smart-app energy monitoring; the delay timer is the extent of its scheduling, and WOLFBOX is a value brand with a shorter track record than the established names.
Who should buy it
Buy the WOLFBOX if you want a single charger for home and travel, if you rent or might move, or if you value flexibility over a bolted-down install. Skip it if you want a permanent, tidy wall fixture and never travel with the charger - in that case a hardwired unit looks cleaner, stays put and can run faster. That trade-off is the whole subject of portable vs hardwired EV charger. For most people who want one charger that goes where they go, the WOLFBOX is the easy answer.
