How do you design an EV charging system for compatibility with various fast charging networks?

Multi-network charging compatibility requires: Supporting multiple physical connectors (CCS, CHAdeMO in some markets) or adapters, implementing communication protocols (ISO 15118, CHAdeMO CAN), handling various power levels and voltage ranges (400V and 800V DC), authentication methods (RFID, Plug&Charge, app-based), voltage matching and bank switching for 800V vehicles on 400V chargers, and graceful degradation for incompatible stations. Testing with multiple EVSE manufacturers is essential due to protocol implementation variations. OTA updates address compatibility issues discovered post-launch. Clear driver communication about charging capability and status is critical.