When Is Overnight Truck Charging Enough?

Start with the energy each truck needs between charging opportunities. Check representative routes, including higher-demand days, against the usable battery energy available within the planned operating range and reserve.

Then check whether the depot can replace the energy used. Include:

• Actual arrival and departure times, allowing for unloading and vehicle checks.
• Time connected to an available charging point.
• The charging rate the vehicle can sustain across the required battery range.
• Power available after other site loads and connected trucks are considered.

A predictable single-shift operation with a long parking window may fit overnight charging well. The same approach may need adjustment when routes lengthen or vehicles return later. Volvo Trucks' charging planning guidance similarly links equipment choice to route energy, stopping locations and available time.

Check the Usable Charging Window

Consider a hypothetical truck that needs 240kWh added to its battery before the next shift. With eight usable charging hours, the required average battery-side power is:

240kWh ÷ 8 hours = 30kW average battery-side power.

If unloading and a later return reduce the window to six hours, the average rises to 40kW. Neither figure is a charger purchase specification: charging losses, changing vehicle acceptance and interruptions need to be allowed for.

Also check the fleet together. A schedule that works for one truck may fail when several need power at the same time. Use the fleet charging power calculation guide to assess the combined requirement.

When Should You Add Daytime Charging?

There are two different shortfalls to recognise:

• The truck cannot carry enough usable energy for its full operating day. It needs an intermediate charging opportunity, a route adjustment or a different vehicle configuration. More overnight charger power cannot increase battery capacity.
• The truck can carry enough energy, but the overnight window cannot replenish it. Longer connection time, revised power allocation or higher charging power may help where vehicle and site limits allow. A planned daytime top-up is another option.

Back-to-back shifts, extra journeys and repeated late returns are reasons to review the plan. A higher-powered charger is useful only if the truck can accept the additional power and the site can supply it.

Fit Top-Ups Around Existing Stops

Look first at places where the truck already stops: a return to the depot between routes, a customer loading location with agreed charger access, or a suitable truck charging site along the route.

Count the time genuinely available for charging after access, manoeuvring and connection. For third-party sites, include opening hours, vehicle access, compatibility and the possibility of waiting. Keep an alternative for occasions when the planned charger is unavailable.

A short stop may only need to deliver enough energy for the next leg. It does not have to recharge the truck fully. The useful comparison is whether the stop supplies the required energy without disrupting the delivery schedule.

Choose Power Around the Schedule

A practical electric truck fleet charging solution may combine routine overnight charging with selected higher-power outputs for short turnaround windows. Managed fleet charging can coordinate demand within the available capacity, while a depot grid capacity review identifies whether the proposed schedule needs more supply.

Overnight charging is not automatically cheaper; any price advantage depends on the electricity contract. Compare costs after confirming that vehicles can complete their routes.

Megawatt Charging System (MCS) is a separate charging technology for compatible vehicles and equipment. It may be relevant to demanding short-stop duties, but an overnight depot does not automatically need it.