Plug & Charge - Ratio Start is the entry level EV Charger from Ratio. Based on 12+ years of development in the EV market, the Ratio Start is developed as the easiest to use and install EV charger without making any concessions with regards to quality or safety. To start a charging session you don’t need a charging app or a payment card. All you need to do is simply plug in the connector in the car to start charging.