Day
By day, charging runs at reduced power
The building consumes more → charging power falls.
Dynamic load management for car parks
More charging points. Without increasing the building's power.
BMA distributes the building's free power between charging stations in real time — without exceeding the site limit.
Illustrative example. Values are notional.
Where the limit appears
The problem begins with scale
- 10 there is still headroom
- 50 the power runs out
- 100+ a different control principle is needed
Illustrative example. A specific site is calculated from actual loads and supply parameters.
Counted by nameplate
100 × 7 kW = 700 kW
But cars stand for 8–12 hours and never need 700 kW all at once. What is needed is not a sum of nameplates but management of the available power.
The limit is not created by the charging station but by the free power of the specific building. While there is spare capacity, connection is routine; the refusal goes to whoever asks once the margin is used up.
Solution
Not a fixed limit, but a live energy balance of the building
Every building has a permitted capacity granted at grid connection. In practice the building almost never uses all of it, and at night it consumes noticeably less. That difference is already connected to the grid — BMA hands it to the charging stations to exactly the extent it is free at that moment.
Time—
Building load—
Available for charging—
Per car—
Cars connected: 40
Evening peak
At the peak, the total stays within the site limit
BMA automatically limits the charging load.
Night
At night, the cars get the maximum
The building unloads → charging power rises.
Without load management
- Each point counts at nameplate and is added to the building's design load
- Only a few stations can be connected — while the input has spare capacity
- Further growth requires more connected capacity: a substation, approvals, months
With BMA Dynamic Load Management
- The power budget is recalculated at every change of the building load
- Power is distributed between cars automatically, via each station's current limit
- The number of points grows with demand — within the site's energy window
Available charging power = permitted capacity of the site − current building load − technical reserve
Illustrative example. Notional site: permitted capacity 600 kW, technical reserve 40 kW, 40 cars connected, stations up to 7 kW; in “No management” mode a notional fixed cap of 60 kW is shown. Algorithms, measurement frequency and the size of the reserve are defined by the supply architecture of the specific site. This is not a calculation of a real building and not a promise of a specific number of stations or charging speed.
How BMA works
Five actions the system performs continuously
One continuous cycle: it never stops while at least one car is plugged in.
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Measures
The current building load at the main input — all consumption, per phase, in real time.
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Calculates
The actually free power, taking the technical reserve into account.
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Distributes
The available power between the connected cars — each station gets its own current limit.
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Recalculates
The limits at every change of the building load.
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Protects
The site from exceeding its permitted capacity: stations can only reduce the load, never raise it.
Control is by current: each station is given its own current limit. The station passes that limit to the car over the signalling line in the charging cable and holds it, so the total stays within the budget.
Algorithms, measurement frequency and the size of the reserve are defined by the supply architecture of the specific site.
Architecture
Control runs on site, not on the internet
The power balance is calculated locally, in the load controller. The cloud handles metering and monitoring but is not part of the control loop.
Grid
Building switchboard
Measurement
BMA Dynamic Load Controller
BMA Cloud
- Data
- Monitoring
- Statistics
- Per-point metering
- User accounts
- Dispatching
BMA charging stations
Cars
- 1Energy flows through the power circuit: grid → switchboard → controller → stations → cars
- 2Measurement at the switchboard sends the current building load to the controller
- 3The BMA Controller calculates the free power
- 4The controller sets the permitted current for the stations
- 5Power is redistributed between the cars
What happens when the cloud connection is lost
The balance and the station setpoints are produced in the cabinet on site. If the cloud link drops, power distribution continues unchanged — only data transfer pauses: session history and accounts update once the link is back.
- Cloud unavailable: metering and accounts update once the connection is restored
If a station loses contact with the controller, it falls back to a preset minimum or switches off. So the permitted capacity of the site cannot be exceeded under any scenario. The site limit can also be set externally — from the grid operator's account.
Illustrative example. Values are notional.
One BMA system
One manufacturer is responsible for the station, the algorithm and the control
The station, the algorithm and the control channel are the responsibility of one BMA system. That is why the guarantee of staying within the limit rests on the architecture, not on settings.
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BMA Charging Station
Charging point that holds the permitted current.
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BMA Dynamic Load Controller
Local measurement and calculation of the available power.
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BMA Cloud
Monitoring, metering and digital services.
Scaling
From a few points to a large car park — without replacing equipment
The same system grows with the car park.
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1 cabinet · 9 or 15 points
Two versions of the load controller.
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Several cabinets
One master module, the rest slaves.
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New station groups
Transition by cabinet firmware; the stations at the spaces stay in place.
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Large car park
The number of points grows with demand within the available power.
The equipment set, the measurement scheme and the distribution of points across phases are defined by the project after a technical site survey.
Applications
Where cars park for long and spaces are assigned
The effect is greatest when a car stays in place for 8–12 hours while the building load is at its lowest.
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Business centres
Daytime parking for staff and tenants within the building's power.
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Corporate car parks
Company and staff vehicles; priorities and limits set by configuration, not by hardware.
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Mixed-use buildings
Housing, offices and services on one main input: one energy balance for the whole site.
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Hotels
Overnight guest parking. Suitable where spaces are assigned to rooms or the hotel controls access to the point; otherwise the access scenario is designed separately.
Who gets what
Four parties — one circuit
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Owner, developer
More charging points without automatically increasing the site's capacity.
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Management company
Sees the load and the state of every point.
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User
Charges at their own space with individual metering.
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Grid operator
Gets an observable and manageable charging load.
Company
Behind the solution is a working production facility
BMA GreenPower is the charging-infrastructure division of the Terra-Tok engineering group: in-house production of electrical equipment and busbar systems.
- 2013 engineering group founded
- 5,000 m² of own production space
- 100+ engineers, designers and developers
- 700+ busbar-system projects
- Engineering centre
- Test laboratory
- Own production lines
- KEMA certification of the group's products
We develop and manufacture the whole chain ourselves — the charging station, the load controller and the cloud software. It is not an assembly of third-party components and not an add-on to someone else's equipment.
Certificates, technical documentation and a reference list are provided on request.
First step
Let us assess your site
We will give a preliminary estimate of how many charging points can be placed with dynamic load management and what source data the calculation needs.
What the calculation needs
- Supply diagram and permitted capacity of the site
- Number of parking spaces and desired number of charging points
- Actual load profile — if there is no data, it is recorded during the site survey
Email: sales@bma-gp.com Phone: +7 (343) 226-77-40