Fleet EV Charging Installation in New Hampshire

Why a Fleet Is a Different Electrical Problem

Fleet EV charging is not workplace charging with more bays. It is a different load profile, and the difference decides the entire design.

Workplace charging is diverse. Cars arrive across a morning, most are not empty, and many finish early, so the site never sees everything drawing at once. A depot is the opposite. Vehicles return within a narrow window, most have run their route, and every one of them needs a full charge before the same time tomorrow. The site’s peak is close to its theoretical maximum, and it happens every night.

That changes the arithmetic. Ten workplace bays might be designed around a realistic simultaneous draw well below ten chargers’ worth. Ten depot bays frequently cannot be, because the honest answer is that all ten will be working at three in the morning.

What rescues it is time. A depot usually has ten or twelve hours rather than two, so the question becomes energy rather than power: not how fast each vehicle charges, but whether the whole fleet is full by morning. That reframing is what makes fleet charging affordable, and it is the single most useful thing to establish before anybody prices equipment.

Sizing to the Route, Not to the Vehicle

The specification that matters is not battery capacity, it is daily mileage, and the two are frequently very different.

A van with a large battery that runs sixty miles a day needs sixty miles replaced overnight, not a full charge. Sizing the installation to fill every battery from empty is designing for a scenario that never occurs, and it is the most expensive mistake available at this stage.

So the starting point is the route data the business already has: miles per vehicle per day, how that varies, and the worst realistic day rather than the theoretical one. Most operators know this better than they expect once asked directly.

That figure sets the energy the site has to deliver overnight, and the energy divided by the hours available gives the power. It is frequently a far smaller number than the equipment brochures suggest, and it is the number a load calculation works from rather than a charger count.

A worked example makes the point. Twelve vans each replacing seventy miles overnight need the same total energy whether that is delivered by twelve chargers working two hours or six chargers working eight. The first arrangement needs a supply several times larger and costs several times more to install, and both have the fleet ready by morning. Operators who arrive with a charger count have usually been quoted the first; operators who arrive with mileage data get the second.

Load Management Instead of a Service Upgrade

This is where a fleet installation is either affordable or not, and modern equipment has moved the line considerably.

Load management distributes a fixed amount of available power across whatever is plugged in, rather than letting every charger draw its maximum. On a depot with a long window that costs almost nothing in practice, because vehicles finish at slightly different times instead of all finishing early.

It also lets the site use capacity the building is not using. A warehouse drawing heavily through the working day is frequently near idle at two in the morning, which is exactly when the fleet wants power. Dynamic management reads the building’s actual draw and gives the chargers what is spare, which on many sites is a great deal.

The alternative is a service upgrade, which is sometimes genuinely necessary and frequently avoidable. Establishing which applies is an evening of data rather than an assumption, and getting it wrong in the expensive direction is common.

Depot Layout and Where the Vehicles Actually Park

The electrical design follows the yard, and the yard is usually already working the way it works for reasons that predate any of this.

Vehicles park where they park: nose-in against a wall, in rows, or wherever they fit when they return in whatever order they return. A charging layout that requires a particular parking discipline will be defeated within a fortnight by a driver arriving late in the rain.

So the question is where charging connections can sit such that any vehicle in any bay can reach one. That frequently means more connection points than chargers, or a layout where each charger serves two adjacent bays, and it is decided by walking the yard at the time of day the vehicles come back.

Cable management is not cosmetic at a depot. Leads dragged across a yard used by forklifts and trucks are damaged quickly, and overhead retractors or bollard-mounted units cost less than replacing cables twice a year.

Phasing the Build-Out so the Second Stage Is Cheap

Almost no fleet electrifies in one step, so the first installation is really an infrastructure decision with a few chargers attached.

The expensive parts are the ones that involve digging and switchgear. Trenching, conduit, the distribution board and the supply to it should be sized for the fleet the business expects rather than the vehicles it has now, because that work costs a fraction more today and the entire job again later.

The cheap part is chargers. Adding units to infrastructure that was sized for them is a day of work; adding them to infrastructure that was not is another trench across the yard.

The practical version is oversized conduit, spare ways in the board and a service assessment against the full fleet, with two or three chargers fitted. That is a conversation about the business’s replacement cycle rather than about electrical equipment, and it belongs at the start.

Metering, Cost Per Mile and Reimbursement

A fleet needs to know what charging costs, and on most sites it needs to know it per vehicle rather than as one line on the building’s bill.

Networked chargers record energy per session and per vehicle, which is what turns electricity into a cost per mile that can be compared against fuel. For an operator justifying the transition, that number is the whole argument, and a site with no metering cannot produce it.

Where drivers take vehicles home, reimbursement becomes a live question, and the answer is usually a home charger that reports to the same account rather than a mileage claim. That is an arrangement worth designing at the start rather than retrofitting.

Tariff choice deserves the same attention as the equipment. A depot charging between midnight and six is the ideal customer for a time of use rate, and on many sites moving to one is worth more annually than any efficiency in the installation itself. It is worth establishing what the site is currently on before the project rather than after, because the business case frequently improves once that is factored in.

Rate structure matters more here than anywhere else in commercial EV. A depot charging overnight is using the cheapest power available, and where a demand charge applies, load management that flattens the peak is worth real money every month rather than only at installation.

Working Around a Yard That Cannot Stop

Most depots run to a schedule that does not have a gap in it, and the installation is planned around that rather than the other way round.

Trenching across a live yard is the disruptive part. Doing it in sections, out of hours, or routing around the working area costs a little more and avoids the thing that actually hurts, which is vehicles unable to get out in the morning.

The supply work has its own constraint. Where the distribution board or the service needs attention, that is a planned outage, and on a site with refrigeration, security or IT it is scheduled with those in mind. Keeping a site running during electrical work covers how that is sequenced.

What is rarely disruptive is the chargers themselves. Once infrastructure is in, adding or swapping units is contained and quick, which is another argument for doing the disruptive work once and properly.

Sequencing matters as much as timing. Getting the supply and the distribution in first, then the containment, then the units, means each stage can be checked before the next depends on it, and it leaves the yard usable between stages. Trying to compress all three into one shutdown is how depots end up with vehicles stranded, and the time saved is rarely worth what it risks on a site that has to dispatch in the morning.

Maintenance, Uptime and What Failure Costs

A depot charger that fails is not an inconvenience, it is a vehicle that cannot run its route, and that changes how the installation should be maintained.

The practical answer is redundancy rather than reliability. A site with one more charging position than it strictly needs can absorb a failure without losing a vehicle, and that spare position is cheaper than the contingency it replaces.

Networked units report faults rather than waiting to be discovered, which matters on a yard where nobody is watching at two in the morning. A charger that stopped at midnight and reported it is a different problem from one discovered at six.

Scheduled inspection belongs in the same arrangement as the rest of the site’s electrical work. A planned maintenance program covering connections, cables and the distribution behind them is what keeps a depot from discovering all of it at once.

What a Fleet Installation Costs and What Moves It

Three things, and the chargers are the smallest of them on most sites.

Civils come first. Trenching, conduit and reinstatement across a yard is the largest single item on a typical depot, and it varies with distance, what the route crosses and whether the surface is gravel or concrete. It is also the item that benefits most from being done once at the right size.

Supply capacity is second and it is binary in cost terms. A site with spare capacity and a load management strategy is a modest job; a site that genuinely needs new switchgear or a larger service is a much larger one with a utility timeline attached.

Chargers are third and the most visible, which is why quotes get compared on them. A quote that looks cheap on equipment and vague on civils is usually the expensive one. The commercial EV charging page covers how the whole picture fits together.

The question worth asking any bidder is what the second phase costs on the infrastructure they are proposing. A quote that cannot answer it has not designed for one, and on a fleet that is electrifying over several years that answer matters more than the price of the first stage.

Timelines are the other thing to establish early, because the long pole is rarely the electrician. Where a service change is involved the utility sets the pace, and that can run to months rather than weeks. A fleet with vehicles already ordered and a supply application not yet submitted is the most common way these projects end up late, and it is entirely avoidable by starting the supply conversation first.