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Is a Three-Phase 22kW EV Charger at Home Worth the Investment? (Is 7KW enough?)


Home EV charger 22KW

Thinking about installing a 22kW EV charger at home? Here’s what you need to know. While 22kW charging offers super-fast speeds, it’s not feasible for most UK residential properties. Let’s break it down.


What is a 22kW EV Charger?


22kW charging is the fastest home charging speed available, using a three-phase power supply. It’s three times faster than the standard 7kW home chargers, delivering up to 90 miles of range per hour compared to 30 miles with a 7kW charger.


Charging Speeds Explained

  • Three-pin plug (2.3kW): Very slow

  • Home charge point (3.6kW): Slow

  • Home charge point (7.4kW): Fast (recommended)

  • Home charge point (22kW): Very fast



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Can You Install a 22kW EV Charger at Home?


Not everyone can install a 22kW charger. Here’s why:

  1. Power Supply: Most UK homes have a single-phase supply, which only supports up to 7kW charging. You need a three-phase supply for 22kW.

  2. Cost: Upgrading to a three-phase supply can cost between £3,000 and £15,000. You can apply for an upgrade through your Distribution Network Operator (DNO).

  3. EV Capability: Most of the EVs in the market can’t charge faster than 7kW at home. Even if you have a 22kW charger, your car may not benefit if it’s not designed for it.


Can Your EV Charge at 22kW?


Check your EV’s specifications. Some cars can handle higher AC charging rates (like 11kW or 22kW), but many are limited to 7kW or less. For example, a Tesla Model 3 can charge at 11kW AC, but if you have a single-phase supply, it will only charge at 7kW.


Is a 22kW Electrical Vehical Charger Worth It?


In most cases, no. Here’s why:

  • Cost and Complexity: Installing a 22kW charger is expensive and complex due to the need for a three-phase supply.

  • Charging Needs: Most EVs charge overnight on a 7kW charger, which is sufficient for daily use.

  • EV Capability: Many EVs can’t take full advantage of 22kW charging.


Comparison 7KW and 22KW EV Charger

When is a 22kW Charger Useful?


  • Businesses: If you have multiple EVs needing frequent charging.

  • Multiple EVs at Home: If you regularly drive long distances and need to charge multiple EVs quickly.

  • Future-Proofing: If you expect your charging needs to increase in the future.



Summary of 22kW EV Charger

For most homeowners, a 7kW charger is the best option. It’s affordable, easy to install, and meets the daily charging needs of most EV drivers. While a 22kW charger sounds appealing, the costs and limitations often outweigh the benefits. Save yourself the trouble and stick with a reliable 7kW charger – it’s more than enough for regular use.

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