PlugEVExpert is a practical toolkit for planning and running EV charging sites. It estimates real peak site load and suggests feeder and main service sizes with room to grow. It models queues, dwell time, and rules to predict wait times and keep bays moving. It forecasts OCPP message rates and safe heartbeat ranges so backends don’t get swamped. It sizes a battery buffer to trim short demand spikes and lower demand charges. It tracks plug-and-charge certificates so cars authenticate smoothly without manual steps. It checks cable gauge and heat rise to avoid hot handles, voltage drop, and early wear. It sets export limits, tunes TOU pricing, and picks fault trip thresholds to stay safe, fair, and reliable.