The EV Charging Engineering Library

OCPI 2.2.1 modules, CDRs, tariff and location sharing between CPOs and eMSPs.

Plug-and-Charge certificates, 15118-2 vs 15118-20, SLAC pairing.

Control pilot states A-F, PWM signalling, proximity pilot.

Modbus RTU energy meter integration for AC and DC chargers.

CAN bus to DC fast charger power modules, CHAdeMO protocols.

GATT services, HMAC challenge-response, offline authorization.

MQTT vs OCPP for telemetry pipelines and edge integrations.

Creepage, clearance, layout for 240V/3-phase, EMC-aware routing.

Contactor vs relay, inrush, weld resistance, lifetime ratings.

Type A vs B, 6mA DC detection, self-resettable RCD.

Shunt vs CT vs Hall, class accuracy, MID/Eichrecht implications.

AC/DC aux supplies, brownout behavior, surge immunity.

Pre-compliance, common failures, filtering, shielding.

Derating, connector heat, enclosure strategy for 50°C ambient.

Phase balancing, neutral handling, 1P/3P switching.

Boot flow, image selection, recovery mode.

Dual-bank flash, signing, rollback.

NVS journaling, transaction integrity, brownout handling.

Key hierarchy, rotation without bricking.

Ring buffers, severity design, remote retrieval.

NVS wear leveling, write budgets over 10-year life.

Partition maps on Xtensa and ARM Cortex-M platforms, OTA + journal + config.

FreeRTOS task design, state machine isolation, watchdogs.

The WebSocket, keepalive, TLS and NAT failures we've seen.

Contact wear signatures, inrush events, precursor patterns.

Real RCD trip patterns and what they mean.

Class-1 meter drift over years, calibration strategies.

Tower handoff, dead zones, coverage patterns.

Phone-side quirks, cache issues, connection intervals.

Real firmware bugs stuck at state B, D or F.

Different protocols, different jobs. When to use each.

Device model, security, ISO 15118 support.

Security, offline capability, deployment cost.

Onboard charger vs off-board, use cases and cost.

Signalling vs communication, coexistence.

Comms, RTOS, cost, certification implications.

What each approach can and can't do.

Where each fits, latency and reliability.

kW from voltage, phases, current; charge time from battery size.

Conductor size from current, length, temperature.

Drop over run length per conductor size.

Chargers vs site supply, dynamic allocation demo.

Cost per session/month from tariff and usage.

Estimate depot charging costs and smart-scheduling savings.

Payback for site hosts from utilization and tariff.

Depot transformer headroom vs charger count.

RIOD field data with US/EU benchmark comparisons.

Aggregated failure-mode stats from the intelligence layer.

OCPP test client, CP signal analyzer, embedded partition tools.