Dynamic load balancing (DLB) adjusts EV charging to the electrical capacity available at that moment. A home or building uses electricity for more than charging: heating, cooking, lifts, lighting and other equipment may share the same supply. Instead of assuming that the full connection capacity is always free, a suitable energy meter and control system monitor demand and reduce charging current when other loads rise.
Europe's energy crisis has made electricity cost and flexibility harder to ignore. This does not mean that every country or building faces a continuous electricity shortage: for EV charging, the practical constraint is often how much capacity a particular connection has at peak times. The IEA's Electricity 2026 analysis describes grid capacity as a growing constraint and points to better use of capacity outside peak periods. Eurostat's 2026 energy overview also shows that household electricity prices differ substantially across EU countries. These pressures make it useful to understand how charging interacts with the local electrical supply.
Static limits and dynamic control are different
A static limit reserves a fixed maximum for charging. It is straightforward, but cannot automatically make more capacity available when the rest of the building is quiet.
A dynamic limit responds to measured demand. When other electrical loads rise, the charging system can lower the current allowed to EVs. When those loads fall, it can make more of the available capacity accessible for charging, within the limits set by the installer. The safe limit has to be considered per phase, especially where single-phase and three-phase chargers share a supply.
DLB manages power at a particular moment; it does not by itself reduce the energy a car needs, guarantee a lower bill, or schedule charging for the cheapest tariff. Time-of-use scheduling or solar-surplus charging are separate capabilities that must be checked for the specific system.
One home charger: measure the house, then adjust the charger
In a typical home arrangement, an electrician places a compatible meter or current transformers at the appropriate supply point. The charger or its controller receives measurements of household demand and adjusts the EV's permitted charging current according to a configured connection limit.
The meter location matters. If the sensor sees only the charger circuit, it cannot account for other household loads. The electrician must also confirm the supply arrangement, protection, phase configuration, meter direction and communication path. A charger advertised with “DLB support” may still require a compatible external meter or accessory.
Apartment garages: a different level of coordination
A shared garage may have several chargers on one electrical panel. That panel may also serve lifts, corridor lights, pumps or other common equipment. In this setting, measuring the main supply is only the first step. A multi-charger controller or energy management system must decide how to distribute the available charging capacity among active vehicles while respecting the building's overall and per-phase limits.
Consider a condominium where one installer plans to begin with a few wallboxes and add more later. A single meter can report what the building is drawing, but it does not automatically tell ten or forty chargers how much each may use. The proposed chargers, meter and controller must support a tested multi-charger topology, and the design must specify what happens if the meter or network connection fails. Four independent groups of ten chargers do not automatically form one coordinated forty-charger installation.
If residents pay separately for their EV charging, load balancing and energy accounting are two separate design tasks. The main building meter helps protect the supply; individual charger or circuit metering and an appropriate management process are needed to attribute consumption to each user. The metering and billing requirements must be checked for the country and use case.
Does a Wi-Fi or Modbus meter work with every wallbox?
No. A meter's ability to measure three-phase power, broadcast data over Wi-Fi, or communicate via Modbus does not prove that a particular EV charger can read it or coordinate other chargers. Check the exact meter variant, protocol, register map or API, charger hardware and firmware, controller, supported number of chargers and installation manual as a complete system.
The same applies to OCPP. OCPP connects a charger to a charging-management system, and smart-charging functions can be used to set charging limits. But “OCPP supported” alone does not confirm that the charger, backend and site meter have been integrated for building-wide DLB.
What should an installer confirm before ordering?
- Supply and loads: connection rating, panel and circuit limits, phase allocation, and other loads sharing the supply.
- Charging plan: initial and future charger count, single-phase or three-phase models, expected simultaneous use and any priority rules.
- Measurement: where the meter or CTs will be installed, what they measure, and whether the exact meter version is compatible with the chosen controller.
- Control and resilience: the tested charger–controller communication method, per-phase allocation, and safe behaviour during meter or network loss.
- Access and accounting: who may charge, how each user's energy will be recorded, and which local billing requirements apply.
A qualified electrician or system designer should approve the final electrical design and commissioning plan. For a multi-charger project, request a verified topology and equipment list for the exact charger, meter, controller and software versions before purchasing components.
Frequently asked questions
Can one meter control ten EV chargers?
A meter can provide measurements, but the control system must explicitly support distributing charging limits to ten compatible chargers. The supported number and topology are product- and version-specific; they cannot be inferred from the meter alone.
Is DLB the same as cheaper off-peak charging?
No. DLB responds to available electrical capacity. Charging at cheaper times requires a compatible scheduler, tariff information and the right electricity contract.
Can a home DLB setup be repeated four times for a forty-charger garage?
Not without a coordinated site design. Each group's limits, the shared incoming supply, other building loads, phase balance and failure behaviour must be assessed together.
Is OCPP required?
Not for every installation. Some systems manage load locally. OCPP can support a managed multi-charger solution when the exact charger, backend and site-meter integration are confirmed.
Planning an EV charging installation? Send WityPower your electrical single-line diagram, supply rating, charger count, phase arrangement and metering needs. We can then review which product configuration and accessories require engineering confirmation before you order.