A fleet depot charger layout is also a cost plan. Two designs can provide the same charging bays but require very different amounts of cabling, trenching and future rework.
The objective is to connect the electrical supply to the vehicles while preserving safe movement, maintenance access and room for expansion. This guide focuses on the layout decisions that change the installed cost of a fleet EV charging solution.
Start With the Fixed Points
Before positioning chargers, mark the electrical intake, transformer, switchroom, vehicle entrances, turning areas, parking direction, charging-port positions, loading bays, buried services and noise-sensitive areas.
Then compare the complete route between them. The UK's Optimise Prime fleet electrification guide recommends considering the distance between distribution boards and charge points, cable cost, obstacles, trenching and reusable ducts during the site survey.
Place the Power Cabinet at the Economic Centre
A distributed system separates the main power electronics and cooling equipment from the vehicle-facing dispensers. The power cabinet can therefore sit in a service area away from vehicle movements and, where practical, offices or other noise-sensitive locations.
It should not automatically be placed as far away as possible. Extra distance can mean longer DC cable routes, more containment and higher civil costs. A practical position balances access to the transformer or switchgear, reasonably short routes to the dispenser group and safe maintenance access.
There is no universal distance. Cable size, voltage drop, protection and maximum permitted cabinet-to-dispenser distance must be confirmed through the product documentation and electrical design.
Compare Three Layout Approaches
Perimeter layout
Equipment placed along a wall or depot boundary can use areas that vehicles already avoid. Existing cable trays or service routes may reduce new groundworks, provided charging leads do not cross vehicle routes.
Central spine or charging island
A common route between two rows of bays can shorten branches to both sides. It must still preserve turning, reversing and vehicle departure order. Compatible dual-output equipment placed between adjacent bays may also shorten charging leads.
Overhead gantry or canopy
Routing equipment and cables above the bays can reduce ground-level obstacles and repeated trenching across an active yard. Any saving must be compared with the steel structure, foundations, height clearance and structural approval.
Layout examples: These photographs show the gantry principle with smaller charging equipment. Heavy-duty charging requires a project-specific structural and electrical design.
Compare Total Route-Metres
Measure the sum of all cable routes, not only the nearest one. Consider a hypothetical four-dispenser depot:
- Cabinet at one end: 20m + 40m + 60m + 80m = 200 route-metres.
- Suitable central service position: 25m + 25m + 35m + 35m = 120 route-metres.
The second layout reduces route length by 40% in this illustration. It is not a cable quotation: actual conductor quantities and sizes depend on current, voltage, installation method and manufacturer requirements.
Also price the excavation, ducts or trays, crossings, reinstatement, barriers and operational disruption. A longer route using an existing tray may cost less than a shorter route cut through reinforced concrete.
Where Distributed Charging Changes the Cost
Standalone DC chargers place the power electronics and charging interface together at each location. This may be economical for a few independent or widely separated bays.
A distributed system centralises power conversion and supplies dispensers at the vehicle positions. At a concentrated multi-bay depot, it can reduce duplicated bay-side equipment and use shared cable routes. It does not eliminate DC cabling, and poor cabinet placement can remove the advantage.
Compare both options using the same output count, cable routes and expansion plan. Our distributed charging systems guide explains the cabinet, dispenser and shared Power Pool architecture.
Prepare Future Routes Before Future Hardware
Future-proofing can mean reserving equipment space, spare ducts or tray capacity, prepared bases and a protected route to future bays—without installing every charger immediately. UK government guidance similarly identifies dedicated cable routes and prepared future connection locations as ways to reduce later infrastructure work.
Set a trigger for each phase, such as additional vehicles, shorter dwell times or another row of bays. This reduces premature equipment spending and the risk of excavating the same yard twice.
How HanYuan Fits a Multi-Bay Layout
The Injet HanYuan distributed charging system separates central power cabinets from dispensers near the vehicles. Its Power Pool allocates installed DC capacity across connected outputs in 40kW increments.
This gives designers flexibility to keep the main equipment in a serviceable area and position smaller interfaces around the bays. The economic case is strongest where several concentrated positions can share power and planned routes. For a small or dispersed installation, standalone Ampax or HanHui equipment may remain simpler.
Final cabinet locations, cable distances and expansion provisions must be confirmed against the selected configuration and detailed site design.
Compare the Layout Before You Break Ground
Share your depot plan, vehicle positions, electrical supply location and future phases. Injet can help compare integrated and distributed DC charging equipment before the cable routes and civil scope are fixed.
Request a Preliminary Depot ReviewRelated Fleet Charging Guides
Continue with complete depot planning, project costs, distributed architecture and grid capacity.
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FAQ
Q1:Where should a fleet charging power cabinet be installed?
The cabinet should normally be placed in a safe, serviceable equipment area with practical access to the transformer or switchgear and reasonably short routes to the charging dispensers. Noise-sensitive areas, vehicle movements and manufacturer distance limits must also be considered.
Q2: Does a distributed charging system always use less cable?
No. Distributed charging can reduce duplicated bay-side power equipment and support shared cable routes at concentrated multi-bay sites, but it still requires DC cabling between the power cabinets and dispensers. Poor cabinet placement can increase total cable length and civil costs.
Q3:What is the most cost-effective fleet depot charger layout?
There is no single layout for every depot. Perimeter layouts may use existing walls and cable routes, central charging islands may shorten branches to two rows of bays, and overhead gantries may reduce ground-level trenching. The lowest-cost option depends on the electrical supply, parking plan and ground conditions.
Q4:Can an overhead gantry reduce fleet charger installation costs?
It can reduce repeated trenching, ground-level obstacles and exposed cable crossings. However, the saving must be compared with the cost of the supporting structure, foundations, height clearance, structural design and maintenance access.
Q5: How should a depot prepare for future charging bays?
Reserve space for future electrical equipment, dispensers and protective barriers, and include spare ducts, cable-tray capacity or prepared bases where appropriate. The design should reflect the expected future electrical demand even when the additional chargers are installed later.
Q6: Is HanYuan suitable for every fleet depot layout?
HanYuan is most relevant to larger, concentrated multi-bay sites that can benefit from central power cabinets, separate dispensers and shared DC capacity. A small depot or a site with widely dispersed charging positions may find standalone DC chargers simpler.
