Depot charging covers 80-90% of a well-designed electric truck fleet’s energy — but the remaining 10-20%, the longer corridors and the diverted routes, is where operations break down if the trucks can only charge at home. The passenger-car world solved this with roaming: one account, many networks. The heavy-truck world is getting there, and fleets that understand the plumbing — OCPP between charger and operator, OCPI between operators, and the commercial roaming agreements on top — can spec interoperable charging into their trucks and their contracts from day one. This guide explains how EV truck charging roaming actually works, what it costs, and what to demand from hardware and network partners.
OCPP (Open Charge Point Protocol) is the language between a charger and its operator’s back office: session start, authorisation, metering, pricing, fault reporting. A charger speaking OCPP 1.6 or 2.0.1 can be managed by any compliant back office — which means your depot chargers can join a public network, and public chargers can be managed through your fleet platform. OCPI (Open Charge Point Interface) is the language between operators: it lets network A’s customer charge on network B’s hardware, with session data and settlement flowing between them. Roaming is OCPI plus a commercial agreement. When a fleet manager says “we need roaming,” the technical translation is: chargers and accounts that are OCPP-native and OCPI-connected, with hub agreements — Hubject in Europe, and emerging regional hubs in the Gulf, Southeast Asia and Latin America — doing the clearing.
Heavy-truck roaming has three complications car roaming never faces. Physical access: a 40 t combination needs 3.5 m lane width, 4.5 m headroom and pull-through bays — most car chargers are useless to a truck regardless of protocol. Power class: a truck drawing 240-500 kW stresses chargers designed for 50-150 kW cars, and network operators price high-power sessions differently. Authentication: truck fleets authorise by vehicle and depot account, not by a driver’s phone app — the truck itself should authenticate (ISO 15118 Plug & Charge) or the fleet’s RFID card should, with cost-centre data flowing back to the fleet platform. A roaming strategy that ignores these three is a spreadsheet, not a plan.
| Charging Source | Typical Price (US$/kWh) | Fleet Impact |
|---|---|---|
| Own depot (off-peak) | 0.06-0.18 (tariff) | Baseline cost — target 80-90% of energy |
| Partner depot (bilateral agreement) | tariff + 10-20% | Best corridor economics |
| Network roaming (OCPI hub) | tariff + 30-60% | Acceptable for occasional use |
| Ad-hoc public DC (no agreement) | 0.30-0.60+ | Emergency only — destroys TCO |
The pricing ladder defines the strategy: depot first, bilateral partners second, roaming as the safety net. The bilateral layer is underused and powerful — two fleets (or a fleet and a bus operator, or a fleet and a port) sharing each other’s chargers via OCPI at cost-plus-15% beats any hub roaming rate, and the chargers’ OCPP back offices handle the metering and settlement automatically. Several of our deployed fleets run exactly this: a beverage distributor and a municipal bus depot sharing infrastructure on opposite shift schedules.
Interoperability is cheapest when specified at order time. On the truck side: ISO 15118-capable charge controllers (our electric trucks ship CCS2 with 15118 support on export variants, GB/T for domestic-Chinese duty) so the vehicle can authenticate itself at any compliant charger. On the depot-hardware side: chargers that are OCPP 2.0.1 native, not retrofitted, so they can federate into partner networks or be commercialised later — a depot charger that sells daytime capacity to a neighbouring fleet is a revenue line, not a cost. On the software side: a fleet platform that ingests OCPI session data from external networks into the same cost-per-km ledger as depot sessions, because energy procurement you cannot see is energy procurement you cannot manage.
Roaming maturity varies sharply by market. Europe is furthest: Hubject covers most high-power corridor charging, and truck-specific corridors under AFIR are adding heavy-vehicle bays. The Gulf is building fast — the UAE and Saudi networks are interoperable within each market, and our UAE market page covers the corridor charging picture fleets plug into there. East and Southern Africa are at the bilateral stage: formal roaming hubs barely exist, but fleet-to-fleet agreements along the major corridors (Dar-Lusaka, Mombasa-Kampala) are being signed now, and early movers are writing the terms. Southeast Asia’s national networks are interoperable domestically but not yet across borders. The practical fleet strategy in every region is the same: own the depot, partner on the corridor, roam for insurance.
Roaming for electric trucks is no longer theoretical, but it rewards fleets that engineer it rather than hope for it. Specify 15118 and OCPP 2.0.1 at purchase, build bilateral charging agreements on your core corridors, hold hub roaming as the safety net, and keep every electron in one cost ledger. Do that, and the 10-20% of energy that happens away from home stops being the operational risk that keeps diesel in the fleet — it becomes just another line in the energy plan, priced and managed like everything else.
Fleets asking “where do we start?” can follow the sequence we deploy with customers. Months one to three: audit the route map for energy risk — which routes exceed 70% of pack range, which have no depot at the far end, which run seasonal peaks. Those routes are the roaming requirement, and for most fleets they number fewer than feared. Months three to six: build the bilateral layer — identify the fleets, bus depots, ports or logistics parks on those routes with compatible infrastructure, and negotiate cost-plus access agreements; the OCPI-capable back offices settle automatically, and one good bilateral agreement usually covers the highest-risk route. Months six to twelve: add the hub safety net — fleet accounts with the relevant roaming hub or national networks, with ISO 15118 on the trucks making authentication invisible to drivers, and monthly review of roaming spend against the bilateral alternatives.
The discipline to maintain is economic: roaming is insurance, not a fuel source. Fleets that let roaming share creep above 15-20% of energy are usually revealing a depot-capacity or route-planning problem that bilateral or owned infrastructure would solve more cheaply. The monthly ledger review — depot versus partner versus roaming cost per kWh — keeps the mix honest and quantifies the case for the next infrastructure investment. Fleets that run this roadmap report the anxiety around away-from-home charging evaporates within two quarters: the trucks have somewhere to go, the drivers know it, the costs are visible and bounded, and the operation stops carrying a spare diesel “just in case” — which, in the end, is what roaming is really for.
On the vehicle side, the TE46 electric port tractor ships with ISO 15118 Plug & Charge support as standard on export variants, so terminal fleets authenticate at any compliant charger without driver cards or apps.
Ready to electrify 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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