The Installer’s Guide to Single vs Three-Phase EV Chargers

If you’ve installed EV chargers before, you know they’re not one-size-fits-all. A big point of confusion can be deciding between single-phase and three-phase chargers. Understanding the difference will save you time, hassle, and ensure your customers get the right setup.

Here’s a simple way to think about it: single-phase chargers run on the standard domestic electrical supply, delivering about 7.4kW. They’re perfect for homes with a typical 230V supply. Installation tends to be straightforward and doesn’t require complex wiring.

On the other hand, three-phase chargers use a 400V supply and can provide much higher power—up to 22kW or even more. These are commonly installed in commercial settings or large homes with three-phase supplies. Installing these requires more careful planning because the wiring and distribution boards are more complex.

Why choose three-phase? Because it charges faster, great for busy workplaces or apartment blocks. But remember, they need a suitable three-phase distribution board, and PME protection is mandatory on both types.

Eco Harmony offers a great selection of reasonably priced three-phase distribution boards that make your job easier: 3-Phase Distribution Boards.

To sum it up:

  • Use single-phase chargers for most homes.

  • Go three-phase for faster charging or bigger sites.

  • Always check the site’s supply type before ordering.

Questions about which charger fits best? Just ask!