Buy the Grizzl-E Duo Connect if you have two EVs, one 50-amp circuit, and no appetite for a second electrical job. It puts two 25-foot cables on a single NEMA 14-50 plug, delivers 40 amps total - the full 40 to one car when it is alone, 20 amps to each when both are plugged in - and it is UL and cUL certified in a Type 4 indoor/outdoor enclosure, adjustable from 40 amps down to 16. The honest caveat is the split: 20 amps is 4.8 kW, roughly 17 miles of range an hour. For two commuters parked for ten hours that is ample. For two high-mileage drivers it is not.
We do not run a testing lab. What follows is compiled from United Chargers' published specifications for the Duo Connect 40A and the live Amazon listing, both checked on 6 October 2026, with the overnight arithmetic done against the NEC continuous-load rule. Everything is cited in Sources.
What you actually get
| Spec | As published |
|---|
| Total current | 40 A (9.6 kW at 240 V), adjustable down to 16 A |
| With two cars charging | 20 A to each |
| Cables | Two, 25 ft each |
| Connectors | J1772 and/or NACS, depending on configuration |
| Supply | NEMA 14-50 plug, one 50 A circuit |
| Enclosure | UL Type 4, indoor/outdoor; 10.25 x 6.25 x 3.75 in |
| Certification | UL / cUL, file E510712 |
| Operating range | -22F to 122F (-30C to +50C) |
| Weight | 26.46 lb |
| Connectivity | Wi-Fi 2.4 GHz and a mobile app |
| Warranty | 3-year, with a 5-year option |
One buying note: United Chargers lists the Duo Connect in several connector configurations - two J1772, two NACS, or one of each - but the Amazon listing we link is the two-J1772 white version. If you want a mixed pair for a Tesla plus a J1772 car, check the configuration before you order, or read chargers for a mixed Tesla and J1772 household, where an ordinary charger plus a listed adapter is usually the cheaper route.
The 20-amp split, and whether it matters
This is the whole product, so it is worth doing the arithmetic rather than hand-waving. The Duo does not add capacity - it shares one circuit, which is exactly why it needs no second electrical job. What that means in practice:
| Situation | Current per car | Power per car | Range per hour | Over 10 hours |
|---|
| One car plugged in | 40 A | 9.6 kW | About 33 miles | About 330 miles |
| Both cars plugged in | 20 A each | 4.8 kW each | About 17 miles each | About 170 miles each |
Range figures assume roughly 3.5 miles per kilowatt-hour. The reason this is usually fine is that two cars in one household rarely both need a big charge on the same night: 170 miles each is far more than two average commutes. And when only one car is home, it gets the full 40 amps, so the shared design costs you nothing on the nights it does not need to.
It stops being fine in three cases. Two genuinely high-mileage drivers. A household where one car comes home nearly empty and leaves early. And a winter where cold weather eats range and some of the charge goes to conditioning the battery rather than filling it - see cold weather range loss. In any of those, two separate chargers that power-share, or two circuits, is the better answer. Our can two EVs share one charger guide works through that decision in full.
What it gets right
One plug, one circuit, no second install
The economics are the point. A second charger usually means a second circuit - a breaker, a cable run, a box, an inspection - and in an older house it can mean a panel conversation you did not want to have. The Duo takes one existing 50-amp circuit with a NEMA 14-50 receptacle and serves two bays from it. Against the cost of a second circuit, the premium over a single-port charger is usually the cheaper half of the comparison, and our installation cost guide shows what you are avoiding.
Two 25-foot cables is the right length
Twenty-five feet is what it takes to reach either bay of a two-car garage, and you get two of them. This is the spec that makes the Duo a genuine two-bay product rather than a box with two cables that both only reach one car. It is also 26 pounds of hardware, so mount it into structure, not drywall anchors - see where to mount an EV charger, and holsters, because two cables on the floor is twice the tripping and twice the grit in the connectors.
The Grizzl-E build, with a UL file number you can look up
UL and cUL certified under file E510712, a Type 4 indoor/outdoor enclosure and a published -22F to 122F operating range. A metal-cased, properly listed unit is what you want on a device carrying 40 amps continuously in a garage, and a file number is the thing that lets you verify the claim rather than trust the copy - see our UL-listed roundup.
Adjustable to 16 amps
The full 40-to-16 range means the Duo also fits a smaller circuit. On a 40-amp breaker you set 32 amps total, which is 16 amps per car when both charge - slower, but it still turns a tight panel into a two-EV garage, which is a genuinely useful thing to be able to do.
What it gives up
It is expensive for a 40-amp charger
Judge it against two chargers plus a circuit, not against one charger. Priced against a single 40-amp wall unit it looks dear, because you are buying a second cable, a second connector and the sharing electronics. Priced against the alternative that actually serves two cars, it is usually ahead. If only one of your two cars is electric today, buy a single-port unit now - the Grizzl-E Classic is the same family at a fraction of the price - and revisit this when the second EV arrives.
No more total power than a single 40-amp charger
Worth repeating because the marketing of dual-port chargers invites the wrong conclusion: this is a sharing device, not a capacity device. If what you want is two cars at full speed simultaneously, you need two circuits or real load management across two units, not one box.
One box is one failure point
Two separate chargers degrade gracefully - if one fails, the other car still charges. A dual-port unit that fails takes both cars with it until it is replaced. That is a real consideration for a household with no public charging nearby, and it is the honest argument for two cheaper single-port units where the second circuit already exists.
Hardwiring is not an option here
The Duo Connect is a 14-50 plug-in unit. For most people that is a positive - it means no hardwire labor and the ability to unplug and take it along - but it does cap the whole unit at 40 amps total, and it makes the receptacle a part you should not economize on. A cheap 14-50 is the single most common failure in home charging under a sustained 40-amp draw; best NEMA 14-50 outlets covers the ones worth fitting.
Who should buy it
Buy it if you have two EVs now, one 50-amp circuit with a rated 14-50 outlet, two bays within 25 feet of one mounting point, and ordinary commuting mileage. In that house it is the cheapest honest answer, and the 20-amp split will never bother you.
Skip it if only one car is electric today, if both drivers cover high mileage, if you want hardwired 48-amp charging, or if you would rather have two independent units. Where the budget allows two chargers, two Wallbox Pulsar Plus units on Power Sharing give each car its own connector at full speed when the other is idle - that is the premium version of the same idea, and it is in our dual-port roundup alongside this unit.
We quote price brackets rather than numbers in prose on purpose: the live figure in the buy row above carries the date we checked it, and it is the only price on this page we stand behind.
