Smart Distribution Panel Design for Integrating Non-OCPP EV Chargers into Real-Time Energy Management Systems: Hardware Implementation and Voltage Impact Analysis

Non-OCPP electric vehicle (EV) chargers lack site-integrated monitoring and supply-control, limiting their use in real-time energy management systems. This paper presents a Smart Distribution Panel that closes this gap via panel-side observability and an operator-commanded single-phase/three-phase (1Φ/3Φ) supply reconfiguration. In a single-site feasibility study, the panel is characterised with one consumer Tesla Wall Connector Gen 3 (Non-OCPP) and one Tesla Model Y at a Taiwan 3Φ3W 220 V site, using a CPM-80 meter (IEC 62053-22 class 0.2S), interlocked contactors, an e-stop relay, and a Raspberry Pi 4 data path. Phase-mode transitions interrupt charging for ∼5 s, resolved by the IEC 61851-1 handshake. A 74.5-min stepwise session—driven by the OCPP DC fast charger with the Non-OCPP Wall Connector idle—yields a site-specific ensemble PCC-bus sensitivity V=224.85−0.147P (R2=0.991), characterising the site + DC-charger + base-load ensemble observed through the panel’s metering rather than the panel’s Non-OCPP path; an OpenDSS bounded sanity check gives an upper-bound slope of 0.26–0.28 V/kW. The one-second data stream supports a non-autoregressive (Non-AR) LSTM residual-detection layer (8-seed RMSE 0.310±0.084 V). A synthetic voltage-drop sensitivity sweep (ROC-AUC 0.81–0.97) characterises sensitivity to injected perturbations, not real-world fault detection. Feasibility is demonstrated only for the tested single-site configuration; multi-site, multi-EVSE, multi-EV generalisation, autonomous demand response, and OCPP session-level features are not demonstrated and are stated as future work.