// Hardware Guide
Depot Charging Infrastructure: What to Plan Before You Buy Vehicles
We wrote this because it's the most common sequencing mistake we see — vehicles ordered before the depot can actually charge them. This is the planning order we walk fleets through before any vehicle order goes in.
Executive Summary
The most common sequencing mistake in fleet electrification is buying vehicles before the depot can actually charge them. Vehicle lead times are often shorter than the timeline for securing electrical capacity, permitting, and installing charging infrastructure — which means a fleet that orders vehicles first frequently ends up with electric equipment sitting undercharged or idle while infrastructure catches up. This guide lays out what a fleet operations or facilities team needs to plan for on the infrastructure side before committing to a vehicle order, so the sequencing runs in the right direction.
Why Infrastructure Should Lead, Not Follow
A conventional vehicle purchase doesn't require any facility change — the vehicle shows up, gets fueled at existing infrastructure, and goes to work. An electric vehicle purchase is different: it requires electrical capacity, charging hardware, and often permitting and utility coordination that can take significantly longer to arrange than the vehicle itself takes to arrive. Utility service upgrades in particular can take many months to a few years depending on the utility, the scope of the upgrade, and local grid capacity — a timeline that regularly surprises fleets who assumed charging infrastructure would be a matter of installing equipment on an existing electrical connection.
The practical implication: the infrastructure planning process should start well before the vehicle purchasing process, not in parallel with it and certainly not after. A fleet that has already assessed its depot's electrical capacity, secured any necessary utility upgrades, and has charging hardware specified and on order is in a position to receive vehicles and put them to work immediately. A fleet that starts the infrastructure conversation after vehicles are ordered is choosing to have expensive equipment sit idle.
Assessing Site Electrical Capacity
What the Depot Can Support Today
The first step is an honest assessment of the depot's existing electrical service capacity — not what the facility was designed for decades ago, but what it can actually deliver today, including any load already drawn by existing equipment and operations. This typically requires a qualified electrical assessment, not just a review of the utility bill or the service panel rating, since usable capacity depends on more than nameplate ratings.
What the Full Fleet Conversion Will Require
Rather than sizing infrastructure for the first few vehicles being converted, model the electrical demand for the fleet's eventual full electrification target, even if the buildout happens in phases. Retrofitting electrical capacity a second or third time as the fleet converts is more expensive and disruptive than planning for the endpoint and building toward it in stages.
The Gap Between Current Capacity and Target Demand
Once current capacity and target demand are both known, the gap between them defines the scope of utility coordination required — whether that's a service upgrade, a new transformer, or in some cases new utility infrastructure extending to the site. This is the step that determines the project's timeline more than any other single factor, and it's worth engaging the utility early, even before charging hardware is specified, since utility lead times are frequently the longest pole in the schedule.
Utility Coordination
Understanding What the Utility Actually Needs From You
Utilities typically require a load study or interconnection application before approving a service upgrade, and the information they need — projected peak demand, load profile, timeline — should come out of the site assessment and fleet conversion modeling described above. Engaging the utility with vague or incomplete information tends to slow the process rather than speed it up.
Asking About Available Programs and Incentives
Many utilities offer make-ready programs, rate incentives, or infrastructure cost-sharing specifically for fleet electrification, since utilities generally want to encourage adoption in a way that's manageable for their grid. These programs vary significantly by utility and region and change over time — ask your utility directly what's currently available rather than assuming based on what you've read about programs elsewhere.
Planning for Utility Timeline, Not Vehicle Timeline
Once the utility has given a realistic timeline for any required service upgrade, that timeline — not the vehicle manufacturer's delivery estimate — should set the pace of the vehicle purchasing decision. If the utility upgrade will take longer than the vehicle lead time, either the vehicle order should be delayed to match, or the initial phase of vehicles should be sized to what current capacity can already support while the upgrade is in progress.
Charging Hardware Specification
Matching Charger Output to Vehicle and Duty Cycle Needs
Charging hardware needs to be specified against the vehicles' charge acceptance rates and the fleet's available charging windows — a charger that outputs less power than the vehicle can accept wastes the vehicle's charging capability, while a charger that outputs more than the site's electrical capacity can support isn't usable at full rated output. This is the same duty-cycle matching discipline that applies to battery chemistry and voltage selection, applied to the charging hardware layer.
Number of Chargers Versus Number of Vehicles
The right charger-to-vehicle ratio depends on charging windows, dwell time, and whether vehicles charge sequentially or simultaneously — not a fixed rule of thumb. A depot with a long overnight dwell time may need fewer, slower chargers than a depot running multiple shifts with short charging windows between routes. Model this against your actual schedule rather than defaulting to a one-to-one charger-to-vehicle ratio, which is often either oversized or undersized for the actual operating pattern.
Physical Layout and Site Constraints
Charging hardware placement needs to account for vehicle circulation patterns, cable management, and physical clearance — retrofitting a depot not originally designed around charging equipment often requires more site work than the charging hardware cost itself. Walk the physical site with whoever is specifying the charging hardware before finalizing equipment selection, not after.
Standards and Compatibility
Specify charging hardware around widely supported connector and protocol standards where possible, rather than a single manufacturer's proprietary approach, to preserve the ability to source vehicles and charging equipment independently of each other going forward.
Permitting and Timeline
Local Permitting Requirements
Charging infrastructure installation typically requires electrical permits and inspection, and depending on the jurisdiction, may also involve fire code review, particularly for higher-power installations or larger battery-electric vehicle concentrations at one site. Permitting timelines vary widely by jurisdiction — get a realistic estimate from your electrical contractor or a local permitting consultant early in the planning process rather than assuming a standard timeline.
Building the Full Project Timeline
The realistic project timeline for depot charging infrastructure typically includes site assessment, utility coordination and any required service upgrade, charging hardware procurement, permitting, and installation and commissioning — several of which can run in parallel but several of which are sequential and depend on prior steps completing first. Build the vehicle purchasing timeline around this full infrastructure timeline, not around the vehicle manufacturer's delivery estimate alone.
A Practical Sequencing Checklist
Before committing to a vehicle order for a new depot conversion: complete an electrical capacity assessment for the site, model demand for the full intended conversion (not just the first phase), engage the utility on any required service upgrade and get a realistic timeline, specify charging hardware against vehicle and duty-cycle requirements, confirm permitting requirements and timeline, and only then set the vehicle order timeline to align with when the site will actually be ready to charge them.
Skipping any of these steps doesn't prevent the vehicles from being delivered — it just means they arrive at a depot that isn't ready for them, which is a more expensive and more visible problem to fix after the fact than it is to plan around from the start.
Plan your charging infrastructure before your vehicle order.
We specify charging, vehicles, and batteries as a single system — so your deployment starts on schedule, not on a delay.