This document argues that electric fleet depot charging is primarily a scheduling and grid management problem, not just an infrastructure one. It covers operational vulnerabilities from unmanaged simultaneous plug-in, grid capability limits, dispatch methodology working backward from gate-out time, demand flattening through staggered starts, optimal hardware architecture, financial impacts on…
This executive decision pack explains why electric vehicle fleet depot charging success depends on scheduling and grid management, not just hardware count. It is written for fleet operators, depot managers, and energy planners managing commercial EV fleets in India.
The document identifies the core problem: uncoordinated plug-in when drivers return creates artificial demand spikes that trip grid limits and leave vehicles undercharged at morning dispatch. It contrasts unmanaged simultaneous charging with a scheduled, sequenced approach.
It covers grid capability constraints including feeder limits, transformer caps, demand charge penalties, and software silos. The document argues that intelligent orchestration beats raw connection sizing, and presents a five-variable formula for each charging session based on departure SoC, energy deficit, dwell window, contention priority, and tariff alignment.
The dispatch methodology works backward from gate-out time, mapping available hours and matching charge profiles to cheapest night tariff valleys. It shows how staggering cuts peak demand by approximately 58% and enables a fixed transformer to serve more vehicles.
Hardware recommendations include AC 7.4-22 kW chargers for overnight dwell, DC 30-60 kW for short turns, and mandatory OCPP connectivity. Financial analysis covers capex bands for small yards, medium hubs, and heavy depots, plus opex impact where demand charges can reach 30-50% of monthly bills.
Regulatory compliance sections cover Ministry of Power 2024 guidelines, local DISCOM load sanctioning, CEA safety regulations, and BEE/BIS standards. The implementation playbook makes the timetable the first design decision, then sizes hardware, layers solar and storage, and maintains public charging as contingency only.