What Voltage Does A Car Battery Charge At. The charging voltage has to drive current backwards into the batteryso that it can interact with the chemistry of the battery. This means the car doesnt need the OBC to convert the electricity from AC to DC so it can charge a lot faster than on a home charge point.
From the diagram above - a small single phase AC 230V 16 amps charging station can deliver max 37 kW. If the battery is deeply discharged 15-30 minutes on a 40-amp charger will provide charge and give the alternator a chance to finish charging the battery while driving your car. The FLOAT stage is where the charge voltage is reduced to between 130 VDC and 138 VDC and held constant while the current is reduced to less than 1 of battery capacity.
A higher charging voltage is used however care should be taken to avoid leaving the battery on charge indefinately as this will overcharge and destroy the battery.
If the battery wont hold a charge or the current does not drop after the expected recharge time the battery may have some permanent sulphation. Charge accumulation with 142-148 volts. At 110 volts the chances of the battery actually cranking over the engine are very very low. At 124 volts a car battery is.
