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E-mobility

Your chargers want a megawatt. Your grid connection doesn't.

Ultra-fast charging demands a lot of power for a few minutes, and upgrading the grid connection is costly and slow. With a BK battery as a buffer, the grid supplies moderate, steady power and the battery covers the DC chargers' peaks.

Design my charging pointHow it works
E-mobility
DC charging power
40–600 kW
Buffer battery in Rivas
2,731 kWh
Management protocol
OCPP 1.6J

The problem

A lot of power for a few minutes.

Ultra-fast charging uses less energy than power: huge, short peaks at hours you don't choose.

  • A high-power DC charger draws hundreds of kW for a few minutes; several at once, more than a megawatt.
  • Contracting that much power means paying a very high capacity charge for something used only a few hours a day.
  • Upgrading the grid connection or building a new transformer substation means civil works, permitting and months of waiting.
  • Without control, charging sessions coincide with the consumption peaks of the rest of the site.
of simultaneous charging in our Rivas-Vaciamadrid project: 1,080 kW at peak.
3 × 360kW
of buffer battery in that same project, with 1,375 kW of power.
2,731kWh
maximum power of the DC chargers in our range (Dual Satellite Flow).
600kW
efficiency of the charger + battery system.
> 91%

60 kW dual charging point with a 100 kWh battery, per datasheet.

How a BK BESS solves it

The grid supplies the average. The battery, the peaks.

The battery recharges slowly from the grid, or from a solar carport, and discharges at full power when vehicles arrive. BK EMS keeps the site from exceeding the grid connection limit.

  1. 01

    Fixed grid limit

    BK EMS keeps the power drawn from the grid below the setpoint, whether one or three vehicles are charging.

  2. 02

    Peaks from the battery

    The difference between what the chargers demand and what the grid supplies comes from the battery, in real time.

  3. 03

    Recharging between sessions

    In the gaps, the battery recharges within the same limit, in cheap hours or from solar.

  4. 04

    Payment and management

    Chargers with OCPP 1.6J, upgradable to 2.0.1, and RFID cards, connectable to the payment platform of your choice, for fleets or public use.

GridLimited grid connectionPV carportOptionalBUFFER BATTERYBK batterySoC68 %DC chargerPoint 1DC chargerPoint 2DC chargerPoint 3Power drawn by the chargers over a daygrid connection limit00h06h12h18h24h
  • Grid contribution (limited)
  • Battery contribution
  • Battery recharging

Illustrative diagram. When several vehicles charge at once, the battery supplies the difference; in the gaps between sessions it recharges without exceeding the grid connection limit.

Configurations

From the company car park to the charging hub.

42.5 kWh battery built in

Storage Flow 80 kW

Fast charger with the battery inside: 80 kW from a small grid connection. For car parks, businesses and light fleets.

Power Pro battery 241–522 kWh

Dual charging point up to 240 kW

A Dual Flow alongside a liquid-cooled Power Pro. For transit stations and fleets.

Bespoke battery

High-power hub

Several chargers of up to 360 kW with a battery in a cabinet or container. As in Rivas-Vaciamadrid.

Recommended products

What we solve it with.

The full range
DUAL FLOW

EV chargers

AC 3.7–22 · DC 40–600 kW

From Home and City Flow in AC to Dual, Power, Hyper and Satellite Flow in DC, plus Storage Flow with a battery. OCPP 1.6J and RFID.

View product

Power Pro

112–522 kWh

The buffer battery for one or two charging points, in a single outdoor unit.

View product

Powerbolt

up to 5 MWh

For multi-megawatt charging hubs or high-traffic EV charging stations.

View product
EMS · ONLINE72%

BK EMS

Core · Pro

Limits grid power, shares the load and manages battery recharging.

View product

References

We have already done it.

All projects

EV chargers + BESS

Rivas-Vaciamadrid (Madrid)

2,731kWh

1,375 kW · charging 3 × 360 kW

Your installation

We tell you which system you need and how it performs in your case.

Project data: type, location, battery energy and power, and charging power.

Frequently asked questions

What people ask us before deciding.

What grid power do I need?
Less than the chargers add up to. We calculate it from the expected number of sessions, their duration and the average energy per vehicle: the battery covers the difference.
What happens if lots of vehicles arrive back to back?
If the battery runs out, the chargers share the available grid power and keep charging, more slowly. We size it so that this is the exception.
Is it suitable for fleets?
Yes. We schedule fleet charging in the cheap hours and reserve power for fast top-ups during the day.
Which protocols and payment methods do the chargers support?
OCPP 1.6J (upgradable to 2.0.1) and RFID card identification; payment integrates with the management platform of your choice. For fast charging, CCS2 across the range; Triple and Quad Flow add CCS1 and GB/T, with optional CHAdeMO on Quad Flow.
What if I put solar panels on the carport?
PV recharges the battery during the day and reduces the energy you buy from the grid. BK EMS integrates it into the same strategy.

How many vehicles do you want to charge?

Tell us how many points, what power and what grid connection you have. We'll propose chargers, battery and works.

Talk to our engineersView products