A charging depot is a production line for electric truck energy, and like any production line its layout decides throughput. A poorly laid-out yard with chargers in the wrong place, tangled cables and no queuing logic will strand trucks regardless of how good the electric trucks are. A well-designed depot turns a 20-truck fleet around in shifts with minimal driver friction. This guide covers charger placement, cable runs, queuing lanes and power phasing for a Dongfeng EV truck depot, using a 20-truck reference fleet as the worked example.
The layout must serve the duty cycle, not the building. A fleet of KT5M electric cargo truck units running 200-350 km daily needs different bay logic than a mix of 600 kWh mining trucks. Start from the km per shift, the pack sizes (210-600 kWh) and the available charge window, then place the hardware. A KT5M with a 282 kWh pack and a 282 kW motor charges comfortably on 120-360 kW CCS2 or GB/T, so the depot design revolves around how many can charge at once within the 1.5-2.5 MVA feed.
Map each truck's daily km, its pack size and its return time. If 20 trucks each need a 10-80 percent charge of 200-420 kWh and they return across a 6-hour window, the depot must deliver roughly 1.4-2.2 MW spread over those hours. That tells you the transformer size (1.5-2.5 MVA with headroom) and the number of stalls (four to six active at once covers 20 with rotation). Designing from the duty cycle prevents both an undersized yard that queues trucks and a gold-plated one that wastes capital on idle capacity.
Place chargers on a shared backbone wall or island so cable runs are short and protected. Liquid-cooled 360 kW cables cost $3,000-8,000 each and should hang on reels, not lie on the ground. The table below compares two common layouts for a 20-truck depot.
| Layout | Stalls | Cable run | Throughput | Cost |
|---|---|---|---|---|
| Wall-mounted row | 6 x 360 kW | short, reeled | high | $210k-420k |
| Island cluster | 6 x 360 kW | medium | high | $240k-460k |
| Single mobile | 2 x 150 kW | long, dragged | low | $70k-140k |
Wall-mounted rows with reeled cables win on cost and durability. Keep chargers under a canopy so rain and sun do not age the electronics, and leave 1.2-1.5 m clearance around each for service. A clean cable path also protects the $3,000-8,000 cables from the ground damage that silently drives depot operating cost up over the first year.
Design marked lanes so a truck pulls in, charges and pulls out without blocking the next. A one-way loop with a staging queue prevents the deadlock that kills depot throughput. For a 20-truck fleet, a 4-6 stall row plus a 3-4 space staging lane keeps vehicles moving during peak return. Paint the lane, install a simple signal or app so drivers know which stall is free, and train them to plug, log and walk away rather than wait beside the cab.
Even with a 1.5-2.5 MVA feed, you do not want all stalls drawing max at once. Use a load balancer that caps total draw and shifts power to the trucks that need it most, so the depot never trips the utility limit. Phase the charger energization as trucks arrive: stalls one and two live at opening, the rest brought online as the fleet grows. This also protects the warranty, because stable power is easier on the onboard charger than spikes from simultaneous max draws across every stall at once.
Depots live outdoors. Slope the pad for drainage, install GFCI and arc-fault protection on every stall, and keep the high-voltage area fenced with clear lockout-tagout points. In hot markets, shade the chargers and batteries; in cold markets, plan the battery pre-conditioning that some packs need before fast charging. A $20,000-60,000 civil works budget for trenching, conduit and grounding is normal for a 20-truck yard and prevents the expensive retrofits that come from skipping it when the concrete was poured.
For a 20-truck KT5M-class fleet: a 1.5-2.5 MVA transformer, six 360 kW wall-mounted CCS2 or GB/T chargers with reeled cables, a one-way loop with a 4-space staging lane, a load balancer capping total draw, and a small parts and training room. Budget $35,000-70,000 per charger plus $20,000-60,000 civil works, and file the grid application 6-18 months early. Reserve one MCS bay if any 500-600 kWh units join later. This layout turns the depot into a reliable energy line that keeps every truck fueled on schedule.
The Thailand electric truck market is scaling fast as logistics and government fleets adopt EVs, and Thai operators are building the first generation of modern depots. A Thailand importer following the layout above gets a 20-truck yard that charges on CCS2 or GB/T, fits the local grid queue, and scales to MCS as 600 kWh trucks arrive. The same design travels across Southeast Asia, where urban delivery and port drayage are the first electric duty cycles to mature and where land and labor for civil works are most available.
A depot that is hard to read at 5 a.m. creates hesitation, wrong-bay pulls and cable trips. Paint stall numbers large, light the pad to 20-30 lux at the charger face, and put the free-stall status on a board drivers see on entry. Simple wayfinding cuts the time a truck spends maneuvering and removes a class of minor incidents that add up over a year. Pair it with the one-way loop and the staging lane so the driver's only decision is which lit, numbered stall to enter, plug, and log before the break, with no ambiguity about where to go.
Avoid these:
The same design scales linearly if you plan the headroom. A 50-truck fleet at 360 kW with four to six active stalls still draws only 1.4-2.2 MW at peak if charging is phased, but to allow growth budget a 4.0-6.0 MVA feed and add stalls in pairs as the fleet grows. Keep the one-way loop and the staging lane, widening them rather than redrawing, because the traffic logic that works at 20 trucks works at 50 with more capacity, not a new layout that disrupts a working yard.
Cable management becomes the binding constraint at scale: with twenty-plus cooled cables at $3,000-8,000 each, the reel and tray system must be specified up front or the yard degenerates into a tangle that slows every turnaround. Extend the wall-mounted row, add a second load balancer downstream of the first, and reserve the MCS bay so the first 600 kWh truck does not force a rebuild. Designed once for the 50-truck end state, the depot absorbs growth without a second civil-works project.
Get the layout right and the electric trucks simply work, shift after shift. Start from the duty cycle, place chargers on a protected wall with reeled cables, build a one-way queuing loop, balance the load against the 1.5-2.5 MVA feed, and file the grid application a year early. A depot designed this way is the quiet engine behind every successful EV truck fleet, and the layout pays for itself in uptime.
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