What is an Inverter?
Converts the battery's DC power into the AC power the motor actually uses.
Simplified animation — not to scale.
In plain English
The inverter is one of the most important EV components most people have never heard of. It sits between the high-voltage battery and the motor, and its job is to convert the battery's direct current (DC) into the alternating current (AC) the motor needs — and to control exactly how much, how fast, and in which direction.
"Think of it like a translator and a throttle in one box. The battery only speaks "DC", the motor only speaks "AC", and the inverter translates between them while deciding how loudly to talk."
How it works
When you press the accelerator, the car's computer tells the inverter how much torque you want. The inverter then chops the DC from the battery into a precisely shaped three-phase AC waveform using fast power transistors (IGBTs or silicon-carbide MOSFETs). When you lift off, the process runs in reverse — AC from the motor is rectified back to DC and pushed into the battery as regen.
Signs of trouble
- ⚠Sudden loss of power
- ⚠"Drive system fault" warning
- ⚠Burning electrical smell
- ⚠Reduced regenerative braking
- ⚠Coolant warning (inverters are liquid-cooled)
£1,500 – £5,400
Always get a written quote. Prices vary by car, region, and parts brand.