Commercial and Fleet EV Charging in New Hampshire and Massachusetts

What Commercial EV Charging Involves

Designing and installing an array of chargers rather than a single unit, with the distribution, the load management and the ground work that implies, and doing it in a way that leaves room for the second phase.

That is the main difference from a home installation. One charger at a house is a circuit. Six in a parking lot is a distribution project: a sub-panel or a dedicated feeder, a trenched or surface-mounted route across the lot, mounting that survives plows and vehicles, and a scheme for sharing capacity between units.

We do this work across southern New Hampshire and northern Massachusetts: employers and office parks in Manchester, Bedford, Nashua and Merrimack, Concord and the state office corridor, Pease International Tradeport, Portsmouth, Newington and Dover on the Seacoast, the I-93 towns of Salem, Derry and Londonderry, and over the line in Lowell, Lawrence, Haverhill, Methuen, Andover and Tewksbury.

Both states are licensed under the same master electrician. For an employer with sites either side of the border that is one contractor and one standard across the portfolio, and the service area page sets out how far that reaches.

Sizing the Array Rather Than the Charger

The question that decides a commercial EV project is not how big each charger is. It is how much capacity the site has and how many vehicles need to be charged by morning.

A bank of Level 2 chargers all running at full output is a substantial load, and taken at face value it pushes most existing commercial services past their limit. Taken realistically, it rarely needs to: vehicles are parked for hours and need a fraction of that time at full rate, so the array almost never needs full output on every unit simultaneously.

That gap between the connected load and the actual requirement is where the engineering is, and getting it right is usually the difference between a project that needs a service upgrade and one that does not.

Our guide to workplace and fleet EV charging covers how that calculation runs, and the load calculator gives a starting point on what a building has spare.

Load Management Instead of a Service Upgrade

Load management is the single most useful tool in a commercial EV installation and it is routinely left out of the first quote a business receives.

A managed system shares the available capacity between the connected vehicles, throttling each charger so the total never exceeds what the supply can carry. Eight vehicles charging at a shared rate over eight hours delivers the same energy as four charging at full rate, and the drivers experience no difference because they are not waiting.

That means an array can frequently be installed on existing capacity that would not support the same number of unmanaged chargers. Where the site is genuinely short even with management, then a service upgrade is the honest answer, but it should be the conclusion rather than the opening assumption.

Management also handles growth. Adding units to a managed array reallocates capacity rather than requiring the design to be reopened, which is what makes phasing practical.

Workplace Charging for Employees

Workplace charging is a long-dwell application, which makes it the easiest case to design well and the cheapest per vehicle.

Cars sit for eight hours and need far less than eight hours of charge, so Level 2 at a moderate shared rate covers a typical commute comfortably. Chasing high output per unit here spends money on speed nobody uses.

The practical questions are about the parking lot rather than the electrical. Which spaces, how they are managed so charging bays are not occupied all day by a vehicle that finished at ten, and whether usage is tracked or billed. Networked units handle access and reporting; unnetworked units are cheaper and simpler where neither is needed.

The pattern we see is demand growing faster than employers expect. An installation designed for today's two electric vehicles is under pressure within a couple of years, which is the argument for running capacity and conduit for the full eventual array even when only part of it is populated now.

Fleet Charging and Depot Installations

Fleet is a different problem from workplace charging because the requirement is absolute: every vehicle has to be ready at a known time.

The design starts from the duty cycle. Daily mileage, return time, departure time and the size of the window between them determine the rate needed, and a fleet returning at six and leaving at six has a comfortable window where one returning at midnight and leaving at five does not.

That window is what decides whether Level 2 across the depot is adequate or whether DC fast charging is genuinely required for part of the fleet. DC changes the project substantially: much larger supply requirements, frequently utility involvement, and equipment that is a different order of cost.

Sequencing is the tool that makes depot charging affordable. Charging vehicles in managed groups through the night rather than all at once flattens the peak, which reduces the supply required and, on a commercial tariff, matters for demand charges as well.

Customer and Public-Facing Charging

Retail, hospitality and destination charging is a different calculation again, because the charger is an amenity rather than infrastructure.

Dwell time sets the specification. A restaurant or a hotel has hours and Level 2 is appropriate. A convenience stop has twenty minutes and only DC fast charging delivers anything meaningful in that time. Installing the wrong one for the dwell time produces a unit nobody uses or one that is permanently occupied.

Public-facing units need networking for payment or access control, signage, and accessible bay design. They also need to work reliably without anyone on site maintaining them, because a broken public charger is worse for a business than no charger.

Placement is a retail decision more than an electrical one: visible enough to be an attraction, not so prominent that the best spaces are permanently occupied by vehicles whose owners are not customers. On a managed site it is usually decided alongside the rest of the property management electrical work.

Trenching, Mounting and the New England Winter

A parking lot installation is as much a civil job as an electrical one, and the ground work is frequently the larger part of the cost.

Runs across a lot go below the frost line, which in New Hampshire is a real depth, or in surface-mounted conduit where trenching is impractical, and the wiring methods have to be rated for an exterior run rather than adapted from an indoor one. Coordinating with paving is worth doing where a lot is being resurfaced anyway, because that is by a wide margin the cheapest time to put conduit in.

Mounting has to allow for plowing and for being driven into. Bollard protection, pedestal positions clear of the plow line, and cable management that does not leave a lead on the ground in a snowbank. A charger installed to a summer standard has a hard first winter.

Equipment needs the appropriate rating for outdoor use here, which means proper cold weather performance rather than a nominal rating. Cable and connector handling at low temperature is a genuine usability issue that shows up in the first cold snap.

Designing the First Phase for the Second

The most expensive way to build an EV installation is to build exactly what is needed today.

Adoption is rising and the sites we install at come back for more units, usually sooner than the original project assumed. The cheap version of that second phase is one where the capacity, the conduit and the distribution were put in the first time and only the units and their circuits get added.

That means trenching once for the eventual count rather than the current one, sizing the sub-panel and feeder for the full array, and choosing equipment that supports being added to. The incremental cost at the time is small; doing it again from scratch is not.

It also means an honest conversation about what the site could eventually support, because that ceiling is set by the supply. Where the ambition genuinely exceeds it, that is a distribution and service conversation to have at the start rather than at phase three.