DC Fast Charger Installation

A DC fast charger is not equipment you mount and energize. It is an electrical infrastructure project that happens to end with a charging cabinet, and the cabinet is usually the least complicated part of it.

We build DC fast charging sites for commercial property owners, fleet operators, retail centers, hotels and municipalities across Broward County, the northern Miami-Dade communities from Aventura through Sunny Isles Beach and North Miami, and Boca Raton and Delray Beach. This page describes the project honestly: what has to exist before a charger can be installed, who controls the schedule, and where the money and the months actually go.

Why this is infrastructure and not an install

Start with the number. A single 150 kilowatt fast charger pulls in the neighborhood of 180 amps at 480 volts three phase, continuously, for as long as a vehicle is connected. A 350 kilowatt unit is more than double that. Put four dispensers on a site and you are asking for more power than many entire shopping centers were built to receive.

That is the whole story in one paragraph. The charger is a piece of listed equipment with a data plate. Delivering that many amps to a spot in a parking lot, reliably, in a hurricane zone, with a high water table under the asphalt, is the project. Most of the work happens before anyone touches the charger, and most of the schedule belongs to the electric utility rather than to us.

The first question: what can this site actually deliver

Every DC fast charger installation begins with an assessment of the existing electrical service, and the findings fall into one of three buckets.

• Adequate existing capacity. Rare, but it happens on properties built with room to grow, on sites that lost a large tenant, or where the service was oversized originally. If the load study shows real headroom at 480 volts, the project shortens dramatically.
• Existing service, wrong configuration. Very common. The building has plenty of amps but at 208 volts, or it is a single phase service, or the switchgear has no space for a feeder of the size required. Some chargers accept 208 volt three phase input but derate significantly, so a 150 kilowatt cabinet may deliver far less than its rating. That tradeoff needs to be understood before anyone selects equipment.
• Insufficient capacity. The usual case for anything above a couple of dispensers. This means a new service, new metering, a new transformer and a utility application, and it is the branch that sets the timeline for the entire project.

We start with a metered load study on the existing service rather than a look at the panel schedule, because panel schedules describe what was installed and a recording meter describes what the building actually uses. The difference between those two numbers is frequently the capacity that makes a project feasible.

Utility coordination, and who really owns the calendar

Once new capacity is required, the electric utility becomes the critical path, and no amount of contractor scheduling changes that.

The process generally runs like this. An application for new or upgraded service is filed with the projected load. The utility performs an engineering review to determine whether the existing distribution in the area can support it, and what has to change if it cannot. That may mean a new transformer, a new secondary run, a primary line extension, upgraded conductors on the pole line, or in some cases equipment further upstream. The utility issues a design and a cost responsibility, easements get drawn and recorded if the equipment sits on private property, and only then does construction get scheduled.

Two realities to plan around:

• Transformer lead times have been long. Distribution transformers have been on extended lead times industry-wide, and a project can be complete in every other respect and still wait on that one piece of equipment.
• Easements take time no one budgets for. If a pad mounted transformer will sit on the property, the utility needs a recorded easement and clear access to it, permanently. That involves the property owner, sometimes a lender, and sometimes an association. Starting this early is free. Starting it late is expensive.

We file, follow and coordinate this on the owner's behalf, but we tell every client the same thing at the start: the utility sets the date, and the honest planning assumption is months, not weeks.

Transformers, switchgear and the equipment yard

New service at this scale means new equipment on the property, and it takes up real estate that has to be found on a site plan that was drawn without it.

A pad mounted transformer needs a concrete pad built to the utility's specification, clear working space in front of the doors, defined clearances on the sides and rear, protection from vehicle impact, and access for a line truck. Utilities publish these dimensions and they are not negotiable. On a tight retail site, finding a location that satisfies the utility, the landscape requirements, the drainage plan and the fire lane can take longer than the electrical design.

Downstream of the transformer comes the customer owned equipment: the service entrance conductors, the main disconnect or switchboard, metering, and the distribution that feeds each charger. Larger sites use a dedicated switchboard for the charging equipment so that the chargers are electrically separate from the building and can be worked on, expanded or de-energized without touching the tenant loads. Where the existing building switchgear will be reused or extended, its condition and available fault current get evaluated, and that often turns into its own scope. We handle that side of the work under commercial panel upgrades.

Every piece of this equipment lives outdoors in a salt air environment. Enclosure selection, hardware, coatings and elevation above the flood plane are design decisions here, not preferences. Gear set too low on a site that ponds during a summer storm will not last, and gear specified without regard for coastal exposure will show corrosion at the door seams within a few years.

Three phase, voltage and matching the equipment

Nearly all DC fast charging equipment expects three phase input, and most of it is designed around 480 volts. That is not a preference, it is efficiency: at higher voltage the same power moves with less current, which means smaller conductors, less voltage drop across a parking lot, and less heat.

Where a site has only single phase service, the choices are a new three phase service from the utility or a phase converter, and for continuous loads of this size the converter path is generally not the right answer. Where a site has 208 volt three phase, chargers can often be applied but with derating and larger feeders, and the economics change enough that the comparison should be run before the equipment order is placed.

Getting the voltage and configuration decision right early prevents the most painful outcome in this business, which is equipment delivered to a site that cannot feed it. Our page on three phase power covers the fundamentals, and the commercial three phase page covers how it gets distributed inside a building.

Trenching, duct banks and the civil work

The distance between the switchgear and the chargers is where a surprising share of the budget lives, because getting conduit across a parking lot is civil construction.

The work involves locating every existing utility on the property before a shovel moves, which in Florida means calling in the locate and then verifying by hand where the drawings are ambiguous. Parking lots are full of irrigation, storm drains, sanitary lines, communication ducts and site lighting circuits that are rarely where the as-builts show them.

From there the route gets designed:

• Open trench where the surface can be cut and restored, with conduits at the required burial depth, properly bedded, with warning tape above.
• Concrete encased duct bank where the run is long, carries multiple large feeders, or passes under a drive aisle that will see truck traffic.
• Directional boring under drive aisles, landscape islands, sidewalks and anything that cannot be closed, which costs more per foot and saves more in restoration and disruption.
• Pull boxes and handholes at intervals and at every significant change of direction, sized so large conductors can actually be pulled without damaging insulation.

South Florida adds two conditions worth naming. The water table is high, so trenches fill, and pull boxes and duct banks need to be designed on the assumption that they will be underwater at some point. And the surface restoration is part of the job, not an afterthought: asphalt cut and patched badly telegraphs across a parking lot within a season, and concrete work that does not match becomes the thing every customer notices. We plan the route with restoration in mind, and where we are already opening a parking lot, it is worth asking whether site lighting should be addressed in the same trench. That work is covered under parking lot and site lighting.

Pads, bollards and mounting the equipment

Charger cabinets and dispensers sit on concrete pads poured to the manufacturer's template, with anchor bolts and conduit stub-ups placed to a tolerance that leaves no room for approximation. A stub-up an inch out of position turns into a problem when the cabinet is set and the conduits do not line up with the entry windows.

Pads have to be sized for the equipment footprint plus the service clearances the manufacturer requires for door swing and cooling airflow, which is often more space than people expect. Anchoring and pad reinforcement also have to satisfy wind load requirements for this region, since a large cabinet is a substantial sail.

Bollards go around anything a vehicle can reach, which in a charging stall is everything. Concrete filled steel pipe bollards set in footings, positioned so a car pulling in hard stops before it reaches the equipment, and placed so they do not block the connector reach or the accessible route. Wheel stops are not a substitute for bollards on the equipment side.

Networking, payment and the pathways they need

A public fast charger has to authenticate drivers, take payment, report its status to a network operator and accept remote configuration and firmware updates. If it cannot communicate, it cannot sell energy, which means the data path is a revenue path and deserves the same attention as the power.

The options, in rough order of reliability:

• Wired Ethernet or fiber back to a network closet or a dedicated cabinet on site. The most reliable, and it requires its own conduit run, kept separate from the power conductors with proper separation and its own pull boxes.
• Cellular modems in each unit. Simple, no additional pathway, and entirely dependent on signal strength in a specific spot in a specific parking lot. That signal should be measured at the actual location before the design assumes it.
• A site network with a wireless bridge or a local controller aggregating several dispensers behind one connection.

Payment hardware brings its own requirements. Card readers, contactless terminals and any associated point of sale connection have configuration and handling obligations for card data, and the network operator will specify how that connection has to be arranged. We coordinate with whichever network the owner selects rather than assuming, because their commissioning process is what ultimately turns the site on.

The practical advice: install spare conduit. A second empty raceway between the equipment and the site head end costs very little while the trench is open and is the difference between a simple change and reopening a parking lot in three years.

Demand charges shape the design

Commercial electric bills have a demand component based on the highest short interval of usage during the billing period, not just on total energy consumed. Fast charging produces exactly the profile that component was designed to capture: a very large draw appearing suddenly and lasting long enough to register.

The consequence is that a single vehicle charging at full rate for twenty minutes can establish the demand level that the site is billed against for that month, whether or not another car ever shows up. On a site with light utilization in its first year, that is the number that determines whether the installation makes financial sense.

Design responses that actually work:

• Power sharing across dispensers, where a single power cabinet feeds multiple dispensers and allocates its output, so total site draw is capped by the cabinet rather than multiplied by the number of stalls.
• Configured power limits on the equipment, delivering less than the maximum rating so that the site's peak stays within a chosen ceiling.
• Time of use scheduling for fleet and depot charging, where vehicles are on a predictable cycle and charging can be spread out overnight.
• Battery buffered chargers, which store energy at a low rate and discharge it quickly into a vehicle, flattening the draw seen by the utility. More equipment, more space and more complexity, but on some sites it is the only design that works economically.
• Rate selection, since utilities have introduced tariffs specifically for charging sites. Which one applies is worth confirming before the design is finalized rather than after the first bill.

We raise this at the design stage because it changes the electrical design. A site engineered around a demand ceiling is a different site than one engineered around nameplate capacity, and the first one is usually the one that stays in business.

Site selection and the parking layout

Where the chargers go affects the cost of everything upstream, so this decision should be made with the electrical route on the table.

The variables we weigh with owners:

• Distance from the power source, because every additional foot is conductor, conduit and trench.
• Vehicle circulation, including whether a driver can pull in and out without a three point turn and whether the layout works for vehicles towing.
• Which side of the car the charge port is on, since it varies by manufacturer and dictates how much cable reach is needed and where the dispenser sits relative to the stall.
• Visibility from the road, which is how a public site earns traffic, balanced against putting expensive equipment in the most exposed spot on the property.
• Lighting and cameras, because people charge at night and will not use a stall that feels unsafe.
• Canopy or shade, which affects both driver experience and equipment temperature in August.

Accessibility is a design requirement, not a courtesy. Charging stalls need an accessible route from the stall to the equipment and to the building, adequate space alongside for a person using a mobility device to reach the connector, the user interface and payment terminal positioned within reachable range, and no wheel stops, curbs or bollards obstructing that route. The connector cable itself has to be manageable, which matters because fast charging cables are heavy. Local plan review takes this seriously, and a layout that ignores it comes back marked up.

Permitting and the inspection sequence

A fast charging project usually needs more than an electrical permit, and the order matters.

• Site plan or zoning review where the project changes the parking layout, adds equipment in setbacks, or alters drainage.
• Civil or right of way permits for trenching, boring and any work approaching a public street.
• Building and electrical permits for the service, the distribution, the pads and the equipment, generally requiring signed and sealed drawings and a load calculation.
• Utility approval running in parallel, with its own review of the service design and metering.

Inspection follows the construction sequence. The underground work is inspected before backfill, which is a hard gate: cover a trench before the inspector sees it and it gets opened again. Then the service and equipment installation, then final. Utility energization comes after the electrical inspection is signed off, and network commissioning and payment activation come after energization. Each of those handoffs has a queue.

Timeline expectations, stated plainly

We will not give you a fast answer on schedule, because a fast answer would be a wrong one. What we will give you is the shape of it.

If the existing service has capacity and the run is short, the project is measured in weeks once permits are issued. If the project requires a new service, a new transformer and a utility line extension, the realistic planning horizon is many months from application to energization, and the majority of that time is utility engineering, equipment lead time and their construction schedule. Sites with easements to record, association approvals or right of way work add more.

The part we control, meaning design, permitting support, trenching, conduit, gear, terminations and commissioning coordination, is schedulable and we hold to it. The part the utility controls is reported to you honestly as it moves. Owners get into trouble when they sign an equipment order or announce an opening date against the optimistic version of this timeline.

What we need to scope your site

To put a real proposal together we want the property address and a site plan or survey, the existing electrical service information including size, voltage and configuration, twelve months of utility bills so we can see actual demand, the number and power level of chargers you are considering, whether the equipment and network are already selected, and who owns the property and who holds any relevant approvals.

If you do not have all of that, we start with a site visit. Walking the property, opening the existing gear, finding the transformer and tracing the likely route usually tells us more in an hour than a week of document review.

Make the first call before the first order

The right first call happens before equipment is ordered and before a date is promised to anyone. Call (954) 602-0050, describe the property and what you are trying to build, and we will tell you what the site can support today and what the path looks like if it needs more. We answer the phone around the clock and we handle the full scope of commercial electrical work in South Florida, including everything that surrounds a charging project.

For smaller sites, workplace charging and multi-family properties where Level 2 makes better sense than fast charging, see our EV charging station page. To get a site visit scheduled, reach us at (954) 602-0050 or through the contact page.