What we learn running a CSMS, written down. OCPP corner cases, product decisions and the occasional story from a site visit.
Device model, security profiles 2 and 3, TransactionEvent instead of Start/Stop, and a migration path that keeps your 1.6J chargers exactly where they are.
Sampled vs. clock-aligned data, which measurands matter for billing, and what to do when a charger sends them in Wh instead of kWh.
How we modelled grace periods, caps and notifications so overstay fees move cars along without a flood of support tickets.
Grid connection, load balancing headroom, signage and QR placement — what to confirm before the installer arrives.
A field guide to UpdateFirmware, DiagnosticsStatusNotification and the three vendor quirks we see most often.
A short, honest retrospective: websocket storms, a timezone bug in CDR exports, and the dashboard we rewrote twice.
Per-kWh or per-minute, connection fees, night rates — and the one line of copy that cut “why was I charged” tickets in half.
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