🚗 Automotive · C4 Architecture · Pro
EV Charging Network Architecture
A charge point operator's platform: chargers speaking OCPP, a central management system, driver app, payments and roaming.
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Drawing diagram…
What this diagram shows
- Chargers connect to the CSMS over OCPP
- Drivers start sessions from the app or RFID
- Roaming lets other networks' drivers charge
Prompt used
EV charging network: AC and DC chargers connect over OCPP 1.6/2.0.1 WebSockets to the charging station management system (CSMS), which handles sessions, pricing and charger health. Drivers use a mobile app to find chargers, start sessions and pay; a billing service charges via a payment gateway. Roaming through an OCPI hub allows other networks' drivers. Load management limits total site power.
Mermaid code
C4Container
title EV Charging Network
Person(driver, "EV Driver", "Finds and pays for charging")
System_Ext(chargers, "Charge Points", "AC and DC chargers")
System_Ext(roam, "Roaming Hub", "OCPI")
System_Ext(pay, "Payment Gateway", "Cards and UPI")
System_Boundary(cpo, "Charge Point Operator") {
Container(csms, "CSMS", "Java", "OCPP server, sessions")
Container(load, "Load Management", "Go", "Site power limits")
Container(app, "Driver App", "Flutter", "Map, start, pay")
Container(api, "App API", "Node.js", "App backend")
Container(bill, "Billing Service", "Node.js", "Tariffs and invoices")
ContainerDb(db, "Sessions DB", "PostgreSQL", "Sessions and chargers")
}
Rel(chargers, csms, "OCPP WebSocket")
Rel(csms, load, "Asks limits")
Rel(driver, app, "Uses")
Rel(app, api, "Calls")
Rel(api, csms, "Start / stop")
Rel(csms, db, "Stores")
Rel(csms, bill, "Session ends")
Rel(bill, pay, "Charges")
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