OCPP & Grid Integration Layer

Backend Core, External Integrations, Security

This blueprint describes the enterprise integration layer behind EV networks: OCPP protocol operations, cloud-native backend, grid operator interfaces, roaming aggregators, payment systems, and end-to-end security controls.

Prototype environment. Illustrative data.

What it visualizes

  • •charger protocol layer (OCPP 2.0.1, ISO 15118 secure element, offline buffers)
  • •backend core (multi-AZ clusters, autoscaling, session manager, load engine)
  • •integrations (TSO/grid APIs, Stripe, Hubject/OCPI, EPEX) with circuit breakers
  • •security & compliance (mTLS, PKI lifecycle, HSM, OAuth/OIDC, audit retention)
  • •settlement and revenue reconciliation workflows

Used for

  • •designing resilient multi-tenant EV backend infrastructure
  • •reducing integration failure risk with governed fallbacks
  • •meeting PCI/GDPR/ISO requirements for energy + billing systems

Related System Views

Network ArchitectureOperations DashboardGeospatial Visibility

OCPP & Grid Integration Layer

Enterprise-grade infrastructure integration architecture

API Latency (p95)
84 ms
OCPP Throughput
3,200 msg/s
Grid Dispatch Latency
420 ms
Integration Health
9.6 / 10
Data Integrity Rate
99.997%
L1

Layer 1 – Chargers

OCPP 2.0.1 Protocol
Active
1,284 chargers
Secure Element (ISO 15118)
Deployed
PnC certificates
Certificate Expiry Monitor
42 expiring <30d
Offline Buffer Capacity
72 hours
Firmware Rollout Coverage
97.8%
Fallback Mode
Cloud-controlled
24h backup
Meter Data Collection
Rate: 1 Hz
±0.5%
L2

Layer 2 – Backend Core (Cloud-Native Infrastructure)

OCPP Server Cluster
4 instances
Region: EU-Central-1
Multi-AZ
99.98% uptime
Kubernetes Auto-scaling
Min: 4 pods
Max: 24 pods
Trigger: CPU >70%
Active
Failover Region
Primary: EU-Central-1
Secondary: EU-West-1
RTO: 15 min
RPO: 5 min
Session Manager
10k sessions
Queue: 142 events
Replay: 7 days
Load Management Engine
Dynamic algorithm
<180 ms
Active
L3

Layer 3 – External Systems Integration

Grid Operator API (TenneT)
SLA99.5%
Latency420 ms
Retry3x exponential
FallbackCached forecast
Circuit BreakerClosed
Payment Gateway (Stripe)
SLA99.95%
Latency180 ms
Retry5x linear
FallbackOffline queue
Circuit BreakerClosed
Roaming Aggregator (Hubject)
SLA99.0%
Latency520 ms
Retry2x exponential
FallbackLocal auth
Circuit BreakerHalf-open
Energy Trading (EPEX SPOT)
SLA99.8%
Latency340 ms
Retry3x exponential
FallbackFixed pricing
Circuit BreakerClosed

Data Flow Architecture

Charger
Source
OCPP Server
Destination
OCPP 2.0.1
Async
<200 ms
Event-driven
High
OCPP Server
Source
Grid Operator
Destination
REST API
Sync
5 min batch
Polling
Medium
Session Manager
Source
Payment Gateway
Destination
HTTPS
Sync
<500 ms
On-demand
High
Load Manager
Source
Energy Trading
Destination
WebSocket
Async
1 min
Event-driven
Medium

Security & Compliance

mTLS (Charger ↔ Server)
Mutual authentication
Enforced
PKI Certificate Lifecycle
Auto-renewal <30d
Active
HSM Key Storage
FIPS 140-2 Level 3
Deployed
TLS 1.3 Encryption
End-to-end
Enforced
OAuth 2.0 + OIDC
API authentication
Active
Zero-Trust Segmentation
Micro-perimeter
Active
Audit Trail Retention
7 years immutable
Compliant
ISO 15118 Plug & Charge
Certificate-based
Ready

Roaming & Market Integrations

Roaming Aggregators
Hubject
Networks
28
Revenue Share
18%
Settlement
14 days
GIREVE
Networks
14
Revenue Share
12%
Settlement
21 days
Direct OCPI Partners
Bilateral OCPI Connections
Partners
14
Revenue Share
8%
Settlement
7 days
Grid & Energy Market
EPEX SPOT
Energy Market
Trading
42 MWh/day
TenneT
Grid Operator
Integrated
187 MW

Grid Constraint Monitoring

Berlin
Available Capacity
+2.4 MW
Load Cap
Active
Transformer Stress
78%
Grid Alerts
2 pending
München
Available Capacity
−1.2 MW
Load Cap
Enforced
Transformer Stress
94%
Grid Alerts
5 active
Hamburg
Available Capacity
+4.2 MW
Load Cap
Inactive
Transformer Stress
64%
Grid Alerts
0
Frankfurt
Available Capacity
+3.8 MW
Load Cap
Inactive
Transformer Stress
58%
Grid Alerts
0

Revenue Flow Integration

1
Session Start
Real-time
<500 ms
2
Billing Calculation
On session end
<2 sec
3
Settlement Processing
Batch
24–48h
4
Accounting Integration
Daily sync
72h
Revenue Reconciliation Rate99.94%
Chargeback Rate0.12%
Payment Success Rate99.4%

Technical Specifications

Protocol Version
OCPP 2.0.1
Multi-tenant Isolation
Namespace-based
Data Partitioning
Geo-distributed
GDPR Compliance
EU-only storage
High Availability
99.99% SLA
Disaster Recovery RTO
15 min
Disaster Recovery RPO
5 min
API Throughput
12k req/sec
Data Retention
7 years