Dynamic Load Management for EV Charging: How It Works

Dynamic load management (DLM) adjusts EV charging power based on a property’s electricity use and configured capacity limits. When demand from other loads rises, it can reduce or temporarily pause charging. As capacity becomes available, it can increase charging again, within the limits of the vehicle and installation. This guide focuses on AC charging at homes and commercial sites.

For homes and commercial sites, this helps make better use of the existing electricity supply. The equipment, settings and control method determine what a system can actually do. This guide explains how DLM works, how multiple chargers share power, and what to check before choosing a system.

What Is Dynamic Load Management in EV Charging?

Dynamic load management is a control function that uses live electrical measurements to set charging limits for one or more EV chargers. Those limits change as other loads use more or less of the available capacity.

At home, DLM can adjust a single charger to account for appliances like a heat pump or electric oven. At a workplace, it can adjust the total charging budget as building demand changes, then distribute that budget among several chargers.

You may encounter several related terms:

Term	What It Describes
Load Management	The broader coordination of charging to meet electrical limits and operating needs.
Load Balancing or Load Sharing	Often describes distributing available capacity among chargers. Some suppliers also use “load balancing” for control based on building demand.
Dynamic Load Management or Dynamic Load Balancing	Adjusts charging limits using live measurements of electrical demand.

Names vary between suppliers. Check what the system measures and controls: a charger group, a garage supply or the property’s main connection. These boundaries determine which capacity limits the system manages.

How Does Dynamic Load Management Work?

DLM follows a repeating process: measure demand, calculate the available charging capacity, set charger limits and adjust them as conditions change.

1. Measure Electrical Demand: A compatible meter or sensor measures current or power at the chosen point in the installation. This might be the property’s main connection or a supply serving a garage.
2. Calculate the Charging Budget: The controller uses those readings and the configured electrical limits to determine how much capacity is available for charging. The calculation must account for whether the measurement includes EV charging or only other loads. Otherwise, the controller could count existing EV demand twice. On three-phase supplies, individual phase limits also matter.
3. Apply Charging Limits: The controller sets a limit for one charger or distributes the budget among several. For AC charging, the charger communicates the allowed current to the vehicle. The vehicle may draw less because of its own charging limits or settings.
4. Repeat and Adjust: As other loads increase, the system can lower charging limits. When demand falls, it can raise them again. Charging may pause when the available capacity cannot support the minimum charging current, then resume according to the system’s settings and the vehicle’s response.

The system repeats this process automatically. Its response time depends on the measurement, communication and control equipment.

What Equipment Does a DLM System Need?

A DLM system needs compatible load measurement, control logic, adjustable charging equipment and communication between them. These functions may be combined in fewer devices, depending on the design.

System Component	What It Does
Meter or Current Sensors	Measures electrical demand at the chosen point. Current transformers, or CT clamps, are one way to measure current.
Control Logic	Calculates the charging budget and sets limits. It may run inside a charger, on a separate controller or through a management platform.
Compatible EV Chargers	Receive and apply charging limits. The required control functions must be supported by the selected model and firmware.
Communication Links	Carry measurements and control instructions through the system’s supported wired or wireless connections.

The measurement equipment, controller and chargers need compatible communication interfaces to exchange readings and charging limits. Check the supported connections and control functions for the selected devices.

For a product example, selected Type 2 configurations in the QIAO Q6 home EV charger and Q7 home EV charger series combine DLB with solar charging. Q6 E610–E613 and Q7 E705–E708 offer wired-CT or wireless-DLB configurations, with 7 kW single-phase and 11/22 kW three-phase versions available.

These configurations are sold as sets with the corresponding CT equipment. Wireless-DLB sets also include the matching wireless communication equipment. Installation still requires suitable wiring, electrical protection and configuration for the site.

How Does Dynamic Load Management Differ From Static Load Management?

The main difference between static and dynamic load management is how the total charging budget is set. Energy Saving Trust explains that static systems distribute a fixed amount of available power, while dynamic systems adjust the allocation as site demand changes.

Comparison	Static Load Management	Dynamic Load Management
Total Charging Budget	Stays within a fixed, configured limit.	Changes as measured demand and available capacity change.
Response to Building Loads	Does not adjust the charging budget as other loads rise or fall.	Uses those changes to adjust the charging budget.
Sharing Between Chargers	Can redistribute the fixed budget as vehicles start or stop charging.	Can redistribute a changing budget among vehicles.
Equipment Requirements	Needs controls suited to the fixed-budget arrangement.	Also needs compatible live measurements and a control path to adjust limits.

Static management can suit an installation with enough capacity permanently allocated to charging. Dynamic management can make better use of capacity shared with changing building loads.

Neither approach determines whether vehicles receive equal shares or priority access. Those rules depend on the system’s supported functions and configuration.

How Is Power Shared at Home and Across Multiple Chargers?

At home, DLM adjusts charging around other household loads. Across several chargers, it also divides the available charging budget according to the system’s allocation rules. The following examples show how those limits can change.

A Single Home Charger

Assume a single-phase installation has an installer-approved control limit of 40 A, and the charger’s maximum current is 32 A.

When other household loads draw 10 A, up to 30 A remains available for charging. If those loads rise to 25 A, the charging limit falls to 15 A. When household demand drops to 5 A, the limit can rise again—but only to the charger’s configured maximum of 32 A.

These are charging limits. The vehicle may draw less because of its own settings or charging capability. The figures illustrate the control process, rather than provide electrical design values.

Several Chargers Sharing a Site Supply

Now assume a site has a configured total limit of 60 kW and two chargers rated at 22 kW each. Both vehicles can accept the allocated power. For simplicity, this example assumes balanced three-phase loads and no solar generation or battery storage.

Operating State	Other Site Loads	Available EV Budget	Charging Limit for A	Charging Limit for B
Only A is charging	20 kW	40 kW	22 kW	0 kW
Both vehicles are charging	20 kW	40 kW	20 kW	20 kW
Building demand rises	40 kW	20 kW	10 kW	10 kW
A finishes but remains plugged in	40 kW	20 kW	0 kW	20 kW

This example assumes equal sharing and a system that reallocates capacity when a vehicle stops drawing power. Priority-based systems may divide the budget differently.

When capacity cannot support both sessions at their minimum charging current, the system may pause a session or alternate between vehicles, if supported. Confirm the allocation and restart behaviour: a connected vehicle is not necessarily an active charging load.

Can DLM Reduce Upgrade Costs—and What Are Its Limits?

DLM can reduce or postpone an electrical supply upgrade when a site has enough spare capacity during the available charging hours. It adjusts charging around other loads, which may allow more charging points to use the existing supply. However, it cannot create extra capacity or guarantee full power to every vehicle.

When Can It Help Avoid an Upgrade?

DLM is useful when building demand changes throughout the day and vehicles can stay connected long enough to charge at varying rates. For example, workplace vehicles may have several hours to charge after a morning peak in building demand.

For home installations, the U.S. Environmental Protection Agency (EPA) recommends asking an electrician about load management or circuit-sharing systems to make better use of the home’s existing electrical capacity. 

Before deciding whether you need load balancing for EV charging, compare the proposed chargers’ maximum demand with the capacity available alongside other site loads. Charger ratings alone do not show how much power the site will need at once.

When Might an Upgrade Still Be Needed?

If vehicles need more energy than the available supply can deliver before departure, DLM cannot close that gap. Charging may need to start earlier, run longer or use additional capacity.

Effective power demand planning for EV charging therefore considers daily energy needs, arrival and departure times, and building demand. It must also account for individual circuit and phase limits; spare capacity elsewhere does not remove those constraints.

Electricity bill savings also depend on the tariff and control settings. Limiting charging demand may reduce demand charges where they apply. Shifting charging to cheaper hours requires scheduling or tariff controls alongside DLM.

Does DLM Need the Internet or OCPP?

DLM does not always need an internet connection or OCPP. The requirements depend on where the control logic runs and how the meter, controller and chargers communicate.

Local Control and Cloud Control

A local system can adjust charging without internet access if the required measurements and control functions remain available on site. It may use wired connections or a local wireless network. Using Wi-Fi does not necessarily mean the system needs internet access.

A cloud-controlled system relies on a connection to a remote platform for some or all charging decisions. Some designs combine local capacity limits with cloud scheduling or remote management.

Check three situations separately:

• Internet outage: Does local load adjustment continue, or does charging use a preset limit?
• Meter or controller communication loss: Does charging reduce to a defined fallback current or pause? How quickly does that happen?
• Platform service ending: Which functions remain available if a subscription expires or the service closes?

Continuing to charge does not necessarily mean live load management is still working. The installer should verify that any fallback charging limit suits the site’s electrical capacity when live measurements are unavailable.

What Role Does OCPP Play?

OCPP allows compatible chargers and management systems to exchange data and commands. Its smart charging functions can deliver charging limits. The Open Charge Alliance lists Smart Charging as an optional function for charging stations in its OCPP 1.6 certification programme. OCPP support alone therefore does not establish a complete DLM system.

The chosen setup still needs live load readings, logic to calculate the available capacity, and chargers that can apply the resulting limits.

Is DLM the Same as Solar or Tariff-Based Charging?

DLM, solar charging and tariff-based charging serve different purposes:

• DLM adjusts charging power to keep demand within configured electrical limits.
• Solar charging uses local solar generation, with modes that may follow surplus output or combine solar and grid power.
• Tariff-based charging schedules or adjusts charging around electricity prices.

These functions can work together in compatible systems. During a cheaper charging period, for example, DLM may still reduce charging power if household demand rises. A solar-only mode may pause charging when surplus generation is too low.

A compatible home energy management system can coordinate these decisions across the charger and other household equipment.

Before combining functions, confirm that the selected model supports simultaneous operation and that electrical limits remain enforced when charging modes or schedules change.

What Should You Confirm Before Choosing a DLM System?

Before choosing a DLM system, ask the charger supplier, installer and management platform provider to confirm what the proposed setup includes and how the installer will test its performance.

What to Confirm	Evidence to Request
Which electrical limits are managed?	A system diagram showing the measurement points, controlled chargers, and limits for the main supply, charging circuits and individual phases, where applicable.
What equipment is included?	An itemized list of chargers, meters or CT sensors, controllers and communication equipment, with optional items and installation work listed separately.
Will the selected devices work together?	Model numbers, firmware requirements and evidence that the proposed combination supports the required functions. A shared protocol name alone is insufficient.
How is power allocated?	Written settings for equal sharing or priority charging, including what happens when capacity is too low to keep every session active.
What happens when communication fails?	Documented fallback limits, response times and recovery behaviour for loss of meter data, controller communication or internet access, as applicable.
Can the system expand?	Supported charger counts, device compatibility and any additional hardware, software or configuration needed when more charging points are added.
What are the ongoing costs and responsibilities?	A quote separating equipment, installation and recurring fees, plus named contacts for commissioning, software support and fault diagnosis.

Before handover, have the installer test the agreed operating conditions. These should include changes in other site loads, vehicles starting or finishing charging, and relevant communication failures.

Record the measured demand, charging limits and recovery behaviour against the agreed settings. This gives the site operator a reference for troubleshooting and future expansion.

Conclusion

Compare your vehicles’ daily energy needs with what the available supply can deliver during their parking time. If that capacity is sufficient, DLM may help you use the existing supply without an upgrade. If it is not, work with your installer to review charging times or assess additional electrical capacity.

About QIAO Charger

QIAO Charger offers home and commercial AC EV chargers, including selected Type 2 Q6 and Q7 configurations with DLB and solar charging.

For model selection and ordering, contact QIAO with your supply type, charging power and wired or wireless DLB requirements. We can provide model-specific specifications and confirm the equipment included in the set.

We also work with distributors, installers and other channel partners sourcing AC charging products for their customers. Share your target market and required configurations to discuss suitable products.