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Web Engineering

Visualizing the Surge: WebSockets for Indian EV Charging Networks

2024-09-08

⚡ Telemetry at Scale: India's EV Infrastructure

Blog Graphic

India's transition to electric mobility involves a chaotic, highly fragmented landscape of charging station providers. For the operators managing these networks, monitoring them is a logistical nightmare.

A standard charging hub contains multiple 50kW DC fast chargers. These are effectively massive internet-connected computers that ping telemetry data—voltage drops, connector temperature, active session wattage—every single second.

The Fallacy of HTTP Polling

If you build an operator dashboard that uses setInterval() to fire an HTTP GET request every 3 seconds to update the UI, you are DDoSing your own database. A network of 1,000 charging stations would generate 28 million HTTP requests a day.

The Power of True WebSockets

To visualize live hardware arrays efficiently, the entire stack must pivot to bi-directional Event Streams or WebSockets.

  1. OCPP Protocol: The physical charging stations don't use REST; they securely transmit telemetry using the Open Charge Point Protocol (OCPP) over WebSockets to a central Node.js gateway.
  2. Redis Pub/Sub: The gateway doesn't write this telemetry instantly to a slow SQL database. It publishes it to a hyper-fast Redis channel.
  3. React Integration: The operator's Next.js dashboard connects via Socket.io. As soon as a car unplugs in Bangalore, the specific React component representing that charger instantly flashes green.

By eliminating the HTTP handshake overhead, you transition from viewing stale, historical data to managing a live, breathing national infrastructure grid.