EV charging stationsA BESS battery storage application for business
How it works
Two 150 kW fast chargers demand a connection capacity most locations do not have. The battery absorbs the peak while the grid is drawn evenly all day — avoiding an expensive capacity upgrade and the wait for a permit.
Even charging
The battery fills slowly from the grid during the hours without customers.
Peak while charging
When a car arrives, the power comes from the battery, not from the connection capacity.
Operating through outages
The site keeps charging through a grid outage — proven in the Ukraine project.
The problem: fast charging needs a lot of power for a short time
A single fast-charging station draws 150 kW or more, but only while a vehicle is plugged in. The rest of the time the grid connection sits unused. Even so, the grid connection capacity has to cover the worst case — all chargers running at once.
Many locations do not have that much power. Increasing it means a new transformer, cables and months of waiting, and sometimes it is simply not possible.
How the battery helps
The battery sits between the grid and the chargers. It fills slowly and evenly throughout the day at a power the existing connection allows. When a vehicle arrives, the gap up to the power required comes from the battery.
This lets a location with a small grid connection offer fast charging. The peak load on the grid also falls, and with it the charges that depend on it.
Sizing and additional benefits
Capacity is chosen according to the number of charging sessions a day and how close together they come. Power is chosen according to the gap between what the chargers demand and what the grid provides.
The battery can also be charged from PV on the canopy or the roof. If the grid fails, the station keeps working — this has been proven in one of our projects in Ukraine, with a 261 kWh, 100 kW battery.
Questions and answers
What battery is needed for a charging station?
It depends on the number and power of the chargers and on the grid connection capacity of the location. For a station with several fast chargers, a cabinet of 233 to 418 kWh is usually enough.
Does the battery avoid the need to increase the grid connection capacity?
In many cases yes, because the peak is covered by the battery while the draw from the grid stays even. Whether that is enough is shown by the calculation for the specific location.
Does the station work in a power cut?
Yes, for as long as there is charge in the battery. With an island-mode system, charging continues without the grid.
Want the same for your site?
Send your load profile and tariff — we return a configuration, a diagram and an indicative price.