At an AC charging station, AC power from your grid is supplied to this onboard charger, which converts it into DC power to recharge the battery. DC chargers offer higher power charging (which needs much larger AC-to-DC converters) by developing the converter to the charging station instead of the vehicle https://edgaryhrrv.livebloggs.com/39536286/the-basic-principles-of-ecoflow-wave-2-car-charger