EV Fleet Charging: The Hard Part Starts After Deployment

The day a fleet’s electric vehicles arrive and its chargers are commissioned feels like the finish line. It’s actually the start of a new, recurring problem: EV fleet charging isn’t a one-time install, it’s a daily operation. Every day after that, the operator has to make sure each vehicle has enough charge for its duty — and has to do it with fewer chargers than vehicles, a fixed amount of depot power, and a clock.

The constraints that bite every day

• More vehicles than charge points. It’s rarely economic to give every vehicle its own charger, so charging has to be sequenced — vehicles take turns, and the order matters.
• A hard depot power ceiling. The site’s grid connection caps how much can be drawn at once. Plug everything in together and you either trip the limit or pay heavily for a bigger connection. Charging has to be spread so total draw stays under the ceiling.
• Non-negotiable deadlines. Every vehicle must be ready for its shift. A van that’s only 60% charged at 6am is a failed delivery round, not a minor inconvenience.
• Time-varying tariffs. Electricity is far cheaper (and cleaner) at some hours than others. When you charge can change the energy bill substantially.

These pull against each other. Charging everything as soon as it returns is simplest, but it spikes demand, breaches the power limit and ignores cheap overnight tariffs. Charging purely for lowest cost might leave a vehicle unready. The operator needs a schedule that satisfies all the constraints at once.

Keeping a fleet charged isn’t about having enough power. It’s about delivering the right energy to the right vehicle at the right time, within limits that never move.

Smart charging is the answer — and it’s an optimisation problem

“Smart charging” means actively deciding which vehicle charges when and how fast, rather than letting every plug pull maximum power on arrival. Done well, it lets a fleet:

• Stay within the existing grid connection, often avoiding or deferring a costly upgrade.
• Shift as much charging as possible into cheap, low-carbon hours.
• Guarantee every vehicle hits its required charge by its departure time.
• Make the most of limited charge points by sequencing intelligently.

That’s a genuine optimisation problem — many vehicles, finite chargers, a shared power budget, individual deadlines and a time-varying price signal — solved continuously as vehicles come and go. It’s the operational counterpart to the planning decisions made when the fleet was first electrified.

Where Full Stack Energy fits

Smart fleet charging is exactly the kind of constrained scheduling and optimisation we build: keep every vehicle ready, respect the depot’s power ceiling, and minimise cost against live tariffs. It’s the day-to-day sequel to the migration challenge and shares its DNA with dispatch optimisation. If keeping your fleet charged is becoming a daily headache, let’s talk.