Which connector standard should a fleet depot use?

Public charging has to serve every vehicle that pulls in, which is why the public-charging answer is 'support everything'. A depot serves a vehicle list you control, on a purchasing schedule you control, driven by employees you train. That is a fundamentally easier problem and it permits a fundamentally cheaper answer: one connector, one cable type, one spare-parts stock, one thing for a driver to do at eleven at night in the rain. If you read connector advice written for retail or workplace charging and apply it to a yard, you will over-buy flexibility you do not need and under-buy the ergonomics you do.

Four names come up in North America and only two of them are live decisions for a light-duty depot on AC charging.

Charging equipment installed this year will still be on the wall when the vehicles that are in the yard today have been cycled out twice. So the useful input is not what you own; it is what your OEM will ship you in model years three through eight, and that is a question your fleet account manager can answer in writing. Ask it in writing. If the answer is that the chassis you buy is moving to J3400, install J3400 cables and adapt the legacy vehicles. If the answer is that your chassis stays on J1772 — which is common in the medium-duty and vocational world — install J1772 and stop worrying about it. The wrong move is choosing a connector from consumer news coverage rather than from a purchase commitment.

Ten years of a depot connector decision is a cable-and-mounting decision. A charging cable in a yard gets driven over, dragged through gravel, frozen, dropped, yanked at an angle and handled with gloves on. The connector standard determines almost none of how well that goes; the cable gauge, the strain relief, the retraction or management system, the holster height and the mounting geometry determine all of it. Specify cable length against your actual parking geometry, because a cable one position too short generates daily improvisation and a cable four feet too long spends its life on the ground. Ask what a replacement cable assembly costs, whether it is field-replaceable, and what the lead time is — that is the part you will be buying repeatedly, and a unit whose cable is not field-replaceable turns a scuffed cable into a dead port.

Connector choice does not set charging speed; circuit amperage does, and on a depot the amperage should come out of the pilot arithmetic rather than out of a brochure. Note the code arithmetic in the third column: EV charging is a continuous load, so the branch circuit is sized above the charger's continuous current, which is why a 48-amp unit needs a 60-amp circuit. That ratio is what makes higher-amperage ports expensive at scale.

Nobody puts this in a business case because none of it is a line item, and all of it is real. Adapters get lost, and a lost adapter at 6am is a vehicle that did not charge. Adapters get left plugged into the cable and driven over. Drivers use the wrong port and report a fault that is not a fault. Dual-cable units cost more per port and have twice the cable assemblies to replace. Signage and driver training expand. Your spares inventory doubles. And the yard supervisor spends a portion of every week on a problem that would not exist with one cable type. None of this argues against a mixed yard when the fleet is genuinely mixed. It argues for converging deliberately on one connector as the fleet turns over, and for treating the transition period as a cost with an end date rather than a permanent state.

Do not extend a light-duty connector decision to a Class 6 to 8 yard without checking. Heavier chassis in North America have largely used CCS1 for DC charging, and the industry has been developing a dedicated high-power connector for megawatt-class charging of heavy vehicles, which is a different physical interface again. If your electrification plan includes heavy trucks in the same yard later, the practical hedge is not to buy their connector today — it is to leave physical and electrical room for a separate high-power area, with conduit and distribution capacity reserved and pavement not yet committed. Connector standards for heavy vehicles are still moving; trench routes and transformer pads are not.

First, require field-replaceable cable assemblies and get a price and lead time for a replacement assembly of each type at the time of purchase. Second, ask whether the unit supports a cable assembly change to a different connector standard later, and if so what that costs and whether it affects the listing or the warranty. Some equipment is built so that the connector is a serviceable part and some is not, and the difference does not appear on a datasheet — you have to ask. A charger whose connector can be changed in the field is a ten-year asset with an option attached. One whose connector cannot be changed is a bet on a standard, and bets should be priced as bets.