Worked example

Fleet Depot 1 MW (Reference)

BESS-buffered DC charging depot sketch on the open DC platform.

Envelope: ≈ 1 MW (design envelope)

Design-target depot architecture: grid connection, PCS + BESS buffer, 800V DC distribution to chargers, OCPP/ISO 15118-ready metering and control.

Problem framing

Overnight charging peaks exceed the contracted import. A pure grid upgrade is multi-year and multi-million.

BESS on a DC bus can supply peak charger demand while keeping import within limits — if architecture and controls are designed together.

PCS + storage on the DC bus provide buffer energy and grid-forming options where codes allow.

DC distribution feeds high-power chargers; metering supports OCPP session data and IEEE 2030.5 utility visibility.

EMS schedules charge windows against tariffs and connection limits — design-target behaviour.

Not a named fleet customer. Not a guaranteed upgrade avoidance. Engineering studies remain mandatory.

Energy flow

01Grid InteractionGrid-forming, grid-following, export limiting, Volt/VAR, frequency response, black start.
02ConversionAC ↔ DC conversion, voltage transformation — PCS, SST, rectifiers, inverters.
03DistributionDC power distribution — busway, cabling, termination, tap-off units.
04ProtectionDC arc protection, digital relays, circuit protection, isolation.
05StorageEnergy storage — BESS, thermal storage, hydrogen — buffering generation and load.
06LoadsEnergy consumption — EV charging, HVAC, motors, data centres, buildings, processes.
07ControlEnergy management, dispatch optimisation, forecasting, VPP participation.
08MeteringMeasurement at every point — grid edge, DC bus, load, charger. IEEE 2030.5-native.

Bring constraints and capacity envelope — architecture first.