The following is a representative scenario drawn from how last-mile fleets typically use mobile rapid charging through a seasonal surge. Figures are illustrative of the pattern rather than a single named customer.
The setup: a fleet that cannot stop
Picture a metropolitan last-mile delivery operation running around 40 electric vans out of a single leased depot. Through most of the year the maths is comfortable: vans return in the evening, plug into the depot's existing chargers, and leave fully charged in the morning. The site's grid supply was never upgraded for heavy charging, but it did not need to be — normal volumes fit inside the overnight window with room to spare.
Then comes peak. In the run to a seasonal surge, parcel volumes climb sharply, routes get longer, and the fleet adds temporary vehicles and extra shifts to keep up. Suddenly the same depot has more vans, each doing more kilometres, with less time parked between shifts. The overnight window that used to be generous becomes the binding constraint on the whole operation.
The problem: the window closes
Two things break at once during peak. First, energy demand per vehicle rises because routes are longer, so vans arrive needing more charge than the usual overnight slot delivers. Second, the depot runs a second shift, so some vehicles need a fast top-up in the middle of the day — a demand the site was never built for. The fixed depot chargers, sized for steady overnight use, cannot cover both without a supply upgrade, and a supply upgrade is a months-to-years project that is useless for a surge happening in six weeks.
The options that do not work are familiar. Upgrading the grid connection is far too slow. Renting diesel vans to cover the gap undoes the emissions case and the cost savings the fleet electrified for. Turning vehicles away or missing delivery windows is a commercial non-starter during the busiest weeks of the year.
The response: mobile capacity, on schedule
The workable answer is to add charging capacity temporarily, exactly when and where it is needed, without touching the grid connection. Battery-buffered mobile rapid charging units are deployed to the depot for the duration of peak. Because they carry their own storage, they deliver high-power charging without pushing the site's peak draw past what the existing supply allows — the units charge steadily from the available supply and renewable sources, then discharge quickly into vehicles.
Two modes cover the surge. Scheduled, contracted sessions handle the predictable overnight and shift-change demand, integrated with the fleet's routing so each van is matched to a charging slot. On-demand response covers the unpredictable part — a van that comes back early, an added route, a mid-shift top-up — without any of it depending on a permanent build.
The outcome: vehicles stay on the road
The pattern this produces is consistent: the fleet gets through peak without missing delivery windows, without renting diesel, and without a six-figure infrastructure project. Charging capacity scales up for the weeks it is needed and scales back down afterwards, so the operator pays for surge capacity as an operating cost rather than carrying stranded fixed assets for the other ten months of the year. The energy stays renewable-backed, keeping the sustainability numbers intact through the busiest, highest-mileage period.
Just as importantly, the depot keeps running normally throughout. There is no yard dug up for trenching, no shutdown to install switchgear, and no operational pause — the extra capacity simply arrives, plugs into the operation, and is monitored and maintained by the provider under an availability guarantee.
The lesson: treat charging as elastic
Peak exposes the core weakness of fixed-only charging: infrastructure sized for the average cannot flex to the exception, and the exception is often the most commercially important part of the year. Mobile rapid charging lets a fleet treat charging capacity the way it already treats vehicles and labour during peak — something you scale to demand and then release. For last-mile operators whose whole business is meeting a delivery window, that elasticity is not a nice-to-have; through peak, it is what keeps the vans moving.
Note: illustrative scenario based on typical last-mile fleet duty cycles and mobile charging deployments; figures are representative, not from a single named client.