Blog & News
February 25, 2018

AC, DC and EV charging capacities

Electric cars & charging

You don’t have to be an electrician to be an EV driver. However, knowing some basic things about electricity will help you with charging and evaluating ranges.


For the most EV drivers, charging possibility at home is the most efficient way to fill in the battery. Most home chargers currently have a maximum power of 22 kW. However, two things can limit this maximum charging power.

Electricity capacity of a building

22 kW charging power requires a building to have the main fuse with rating of 32 A. Many residential buildings currently have slightly smaller main fuses than this. For this reason, the maximum power of charging devices can be restricted at Virta’s admin panel.

AC and DC

Basic charging devices give AC power to your car. All electric cars have a built-in, on-board charger that turns this AC into DC power and transmits it to the car battery. On-board charger has a maximum capacity depending on the car, meaning they can transfer electricity to the battery with a limited power. Some on-board charger capacities of most popular EVs are collected on the table below.



Fast chargers are another thing: They feed DC power to the car, so the on-board charger is bypassed and the charging power can be much higher.

Future cars will be able to charge with higher power and have bigger batteries. Charging points installed today should serve all users and be future-proof. Smart charging stations can adjust the power between different vehicles. These features ensure safe and fast charging for everybody: cars with bigger batteries can charge a little faster.


Virta Bundle is a charging service package including charging devices, smart charging service and admin panel. Read more and contact us.

Customer stories

Check our latest customer stories

Case Rokkiparkki – Residential parking gets an EV charging facelift

“Virta had no problem shaping their operating model to fit our needs. That was something really important to us because other providers had a ‘take ...
View customer story

Case Ísorka: Building an open EV charging network in Iceland

Ísorka is an Icelandic charging point network operator on a mission to bring EV charging where people need it the most: homes, workplaces, and places ...
View customer story

Case ELBUL: Virta white-label services in practice

Virta's platform solution is provided to our customers as a white-label service. Our customers are currently offering electric vehicle charging ...
View customer story
Contact us

Leave us your contact details and we’ll be back to you in no time!

Subscribe to blog notifications

Tailored to fit your brand

All Virta charging services can be fully rebranded for your existing brand - contact us to learn more.
Contact us