How long can a battery installation charge a bank of EVs?

1. Fast chargers

With 22 public fast chargers on site, each 7kW, this equates to total power demands of 154kW if they were all in use at the same time. In ideal conditions, E-STOR could power all these fast chargers continuously for around 2 hours before the batteries needed to be recharged.

2. Rapid and ultra-rapid chargers

There are two 50kW rapid chargers on site, equating to total power demands of 100kW. Our E-STOR system could power both chargers, continuously, for over three hours. The same figures apply if E-STOR was running the 100kW charge point on its own, or it could run all three continuously for almost two hours.

3. Mixed use

A more likely scenario is demand spread across the different available chargers, for example running seven of the 7kW charge points and one of the 50kW chargers concurrently. In this scenario, E-STOR could power all eight charge points continuously for almost four hours.

Of course, the demands on the charging hub will peak and trough depending on how many vehicles are plugged in at once and what type of charger they use. Taking the example of a Tesla, you can fully recharge it in about two hours on a 50kW rapid, but it is more likely to be there for a top-up charge, meaning a much shorter charging time. E-STOR can recharge its batteries from the grid and the solar array, meaning it can replenish the stored energy when not in use.

Example: Allego

Allego is a leading provider of EV charging infrastructure. The Dutch company is building an international charging network with more than 28,000 charge points operational throughout Europe.

Allego installed 50kW rapid chargers on the motorway near the German town of Kirchheim. However, the local grid connection could only support 40kW. Allego had to either invest in an expensive grid capacity upgrade, or a much more cost-effective energy storage system.

We supplied Allego with our E-STOR 60/90 system, which provides 60kW of power. Thanks to our active load management technology, the chargers can only provide 50kW when there is sufficient power available from the grid and E-STOR combined.

The system we installed is designed to provide the additional 10kW that the site needs each time a car is plugged in. It has the capacity to provide this extra buffer for a continuous charge of six hours.

Systems the size of Allego’s are therefore designed for occasional use by EV drivers – plus, the grid can refill the batteries whenever there are no EVs plugged in for a charge. Read more about our work for Allego.

Ask the experts

Connected Energy is one of only a handful of companies in the world so far to have successfully deployed second life batteries in real-world applications. We have proven products for EV charging hubs that are designed to meet the needs of fleet, workplace and charging hubs. Download our recent EV charging guide to discover more about how battery energy storage can support EV charging.