Why can't they put alternators on electric cars?
Mia Lopez
Updated on March 11, 2026
Electric cars don't have alternators for two good reasons:
EVs don't have engines, so an alternator would be lacking its power source. It would be possible to use an electric car's rechargeable battery to spin the alternator, but this would be self-defeating, using up more electricity than it generates.Do alternators work on electric cars?
Electric vehicles and hybrids don't have an alternator. Instead, they have a DC-to-DC converter that recharges the 12-volt battery using power from the high-voltage battery pack (the “traction battery”) that powers the vehicle.Can you put a alternator on a Tesla?
Electric cars like Tesla don't have alternators. Instead, they have DC to DC converters that power the 12v battery. Thus electric cars don't need to have an alternator. Understanding why electric cars don't have an alternator can be confusing.How many alternators would it take to charge a Tesla?
The tesla uses 96 series blocks (16 modules of 6 series cells) or 402V peak for the 85kWh model. Each series string is made of many parallel 3.1Ah cells modified by Tesla. If the car can use a peak 320kW, then you would need 320 / 2.5 = 128 alternators and considerably more engine power to turn them.Why don't they put alternators on Tesla's?
Electric cars don't have alternators for two good reasons:Alternators don't generate electricity from thin air. In gas cars they get it from mechanical power, which is supplied by running the engine and burning fuel. EVs don't have engines, so an alternator would be lacking its power source.