Explanation
A power module is one of the key components inside a DC fast charger. It takes AC electricity from the grid and converts it to the DC electricity your battery needs. Fast chargers typically contain multiple power modules stacked together, and the total number of modules determines the charger's maximum output.
The modular design is intentional. If one power module fails, the charger can continue operating at reduced power using the remaining modules, rather than going completely offline. This improves reliability. The faulty module can be swapped out by a technician without replacing the entire charger.
Modular architecture also allows flexibility. A CPO might install a charger with 4 modules (150 kW) initially and add 4 more modules later to upgrade it to 300 kW as demand grows. This is more cost-effective than replacing the entire charger. Each module typically provides 25 to 60 kW, depending on the manufacturer.
For official definitions, visit CharIN e.V.
Where you'll see this
- In vehicle specifications
Common confusion
When a charger shows a lower-than-advertised maximum power, it might have a failed power module. The charger still works, just at reduced capacity. This is not necessarily your car limiting the power.
Example
An Alpitronic Hypercharger contains up to 6 power modules of 60 kW each, totaling 360 kW. If one module fails, the charger still delivers up to 300 kW from the remaining five.
Related terms
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From Finn, engineer: Understanding charging terminology helps you troubleshoot faster at the charger. These definitions are based on industry standards and our consulting work with automotive manufacturers.
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