Smart grids have big challenges for incorporation of new technologies, in the last years, many faults have been detected in inverters, station chargers, photovoltaic (PV) generation and distribution transformers; because, the medium voltage grids have been designed for radial installation. Nevertheless, for smart grids, it requires connections between high voltage substations with medium voltage grids, high penetration of photovoltaic generation and station chargers, required for new emerging countries. One of the most important aspects are electrical mobility (E-mobility) in urban cities, ultra-grid penetration, the medium voltage grids have to consider new improvements. In this research, a new methodology is proposed with seven steps. For electrical mobility in Peru, the electrical networks with photovoltaic Solar panels and fast charging stations for emerging countries have new effects as overload in transformers, inverter control and modelling for station chargers and distribution transformers should be review, due to loads transfer, voltage sag and losses, the impact is high in a short term. These results provide challenges for government, industry and prosumers. Results have demonstrated voltage sag are from 5.68% to 3.81%, losses from 1, 120kW to 860kW, voltage transformer from 1.21% to 1.09% and transformers rotations with a detailed load density analysis with 20% penetration with fast charging stations and 40% of ultra grid penetration with photovoltaic generators.