The first question a fleet engineer asks about electrification is rarely the trucks — it is the wire. Twenty electric trucks plugging in at a depot represent a theoretical load of two to five megawatts, and the site's existing connection is nowhere near that. In most of our export markets, the quote for a new connection at that capacity arrives with a lead time measured in years and a price that rewrites the business case. Here is the fact that changes the calculation: fleets almost never need the theoretical peak, because trucks do not all need maximum power simultaneously — and smart charging management is the discipline of proving it, in advance, with numbers. This article explains how we design depot charging around the connection the client already has, using fleets of the KT5M electric box truck as the working example, with market context from our Indonesia electric truck market guide.
Start with what the fleet actually needs, not what it could draw:
| Parameter (20 × KT5M, 262 kWh avg) | Value | Note |
|---|---|---|
| Daily fleet energy | ~3,400 kWh (20 × 170) | From duty-cycle audit, not nameplate |
| Theoretical simultaneous peak | 4,800 kW (20 × 240 kW) | The number that scares utilities — never actually required |
| Required overnight energy | ~3,400 kWh in 10 h | = 340 kW average — a fraction of the peak |
| With staggered departures | 420 kW average over 8.5 h | Deepest-need trucks finish first, disconnect, free capacity |
| Connection actually required | ~500–600 kVA with management | A depot connection most industrial sites already hold |
The gap between 4,800 kW of theoretical peak and 500–600 kVA of managed reality is the entire commercial argument for load management — the difference between a grid upgrade project and a software configuration.
Load management is usually sold on cost; its reliability function is equally valuable. A managed depot never trips its own main breaker when twenty drivers plug in simultaneously at 23:10 — the single most common charging outage in unmanaged new depots. The same controller that balances load watches every charging session's power curve, flagging degradation in a charger's delivery weeks before it becomes a failure. And when the site's connection is lost, managed charging ramps back intelligently on restoration instead of dumping full demand onto recovering equipment. Our charging uptime guide covers the redundancy layer; this is the intelligence layer that makes the hardware behave like a fleet instead of twenty independent appliances.
Load management only works if the chargers and the trucks speak to a system the fleet controls. Our recommendation, borne out across deployments: insist on OCPP-compliant charging hardware with the load-management profiles enabled, and a management platform that reads (rather than owns) the vehicle-side data through the fleet's telematics. Proprietary stacks that lock charging data behind a vendor's portal are a commercial dependency fleets regret at renewal. The truck side needs nothing special — the BMS negotiates its charge rate with whatever the dispenser offers, which is exactly how a KT5M and a 60 kW AC position or a 240 kW DC position reach a managed agreement under the site controller's arbitration.
The load-management conversation with fleet and depot planners tends to circle the same five questions, and the answers deserve recording. Do we need a new grid connection for twenty trucks? Usually not — the arithmetic in this article's worked example generalises: managed charging typically supports roughly one heavy electric truck per 25–30 kVA of existing industrial connection, and most depots hold far more than their first tranche needs; the load study confirms the specific number in two weeks. What if our tariff has no time-of-use structure? The scheduling value shrinks, but the connection-capacity value remains — load balancing is what lets the fleet grow into the wire it already has, TOU or not. Does smart charging slow the trucks' readiness? Managed correctly, no: the scheduler works backwards from departure times and route priorities, and trucks that must be full are full; the trucks that pay the flexibility margin are the ones the schedule knows have slack. What happens when the system fails? The fallback is by design — chargers default to standalone operation at their own rated power, and the site's protection coordination is engineered for that mode too; the failure mode of management is a slightly dumb depot, not a stopped one. Can we add solar later? Yes, and the controller's metered data is what sizes the array honestly: a year of charging-session logs tells the PV designer the load profile the panels must serve, converting the solar decision from a guess into a calculation.
The summary observation from deployments: load management is the least visible component of an electric fleet and the one with the highest ratio of value to cost. The trucks arrive to cameras; the controller quietly halves the infrastructure bill — and keeps it halved through every fleet expansion that follows.
Designing depot charging for your fleet? Contact Shaanxi Fenghan Trading — authorized Dongfeng EV truck exporter. WhatsApp: +86 153 1943 1311 | Email: sales@fenghan-trade.com | dongfengevtrucks.com
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