EV chargers can place a significant and continuous load on a home or commercial electrical system. When charging takes place alongside other high-power equipment, or when several EV chargers operate at the same site, the total demand may approach the available electrical capacity.
Load balancing helps manage this demand by controlling how much power is allocated to EV charging.
The two most common approaches are static load balancing and dynamic load balancing. Static load balancing uses a predefined charging limit, while dynamic load balancing adjusts EV charging power according to real-time electricity demand at the site.
Both methods aim to keep charging within safe electrical limits, but they differ in flexibility, monitoring requirements, installation complexity, and how efficiently they use available capacity.
In this guide, we explain how static and dynamic load balancing work, where each approach is most suitable, and what installers, site operators, and EV charger buyers should consider when choosing between them.
What Is Load Balancing in EV Charging?
Load balancing in EV charging is a method of controlling charging power so that EV chargers operate within the available electrical capacity of a home, building, or charging site.
Every electrical installation has a limit on how much power it can supply at a given time. 1 EV chargers share that capacity with other electrical loads such as lighting, heating systems, air conditioning, machinery, or household appliances.
If total demand becomes too high, the electrical system may exceed its designed capacity. Depending on the installation, this can lead to protective devices tripping or create the need for a higher-capacity electrical connection.
Load balancing 2 helps avoid this by limiting or adjusting the power available to EV charging.
For a single charger, this may simply mean keeping charging below a defined power limit. For sites with several chargers or changing building loads, more advanced load management can adjust charging power as site demand changes.
The goal is not to reduce the amount of energy an EV eventually receives. Instead, load balancing manages when and how much power is available for charging at a given moment.
Why Is Load Balancing Important for EV Chargers?
EV charging can represent one of the largest electrical loads in a home or commercial property. A single AC charger may operate for several hours, while a site with multiple chargers can create a much larger combined demand.
The challenge is that EV charging is rarely the only electrical load operating at the same time.
A residential property may also be using:
- Heat pumps
- Electric ovens
- Water heaters
- Air conditioning
- Other household appliances
A commercial site may have:
- HVAC systems
- Lighting
- Office equipment
- Machinery
- Multiple EV chargers
- Other high-power electrical systems
Because these loads change throughout the day, the amount of electrical capacity available for EV charging can also change.
Without load balancing, an installer may need to reserve a fixed amount of capacity for EV charging or consider upgrading the electrical supply.
A suitable load balancing strategy can help a site use its existing electrical capacity more effectively 3 while keeping EV charging within defined power limits.
This becomes particularly relevant when:
- The electrical supply has limited spare capacity
- Several high-power loads operate at the same site
- Multiple EV chargers are installed
- Charging demand varies throughout the day
- Future expansion of EV charging is expected
What Is Static Load Balancing?
Static load balancing uses a predefined power limit for EV charging that does not automatically change according to real-time site electricity demand.
The installer determines how much electrical capacity can be allocated to EV charging and configures the charging system to remain within that limit.
For example, if a site reserves 22 kW for EV charging, the charging system will operate within that 22 kW allocation regardless of whether other electrical loads at the site are currently high or low.
This makes static load balancing relatively simple to understand and configure.
However, because the charging limit is fixed, the system cannot automatically take advantage of additional electrical capacity when other site loads are low.
Conversely, the predefined limit must be selected carefully enough to remain suitable when other loads are operating.
How Does Static Load Balancing Work?
Static load balancing follows a fixed allocation model.
A simplified process looks like this:
- The available electrical capacity of the site is assessed.
- A defined amount of power is allocated to EV charging.
- The EV charger or charging system operates within that predefined limit.
- The charging limit remains unchanged unless it is manually reconfigured.
For a site with multiple chargers, the allocated EV charging capacity may also be distributed between several charging points.
For example, if 44 kW is allocated to four chargers, the charging system may distribute that available power across the active chargers according to the system configuration.
The key point is that the total EV charging allocation remains fixed.
When Does Static Load Balancing Make Sense?
Static load balancing can be suitable where electrical demand is predictable and enough capacity can be reserved for EV charging.
Typical situations may include:
- Sites with stable electrical demand
- Installations with one or a small number of chargers
- Properties with sufficient spare electrical capacity
- Projects where charging demand is predictable
- Installations where simpler system architecture is preferred
Its main advantage is simplicity.
Because static load balancing does not require continuous monitoring of total site demand, the system architecture is generally less complex.
However, that simplicity also means less flexibility.
If actual building demand changes significantly throughout the day, a fixed EV charging allocation may leave some available electrical capacity unused.
What Is Dynamic Load Balancing?
Instead of reserving a fixed amount of power for charging, the system monitors how much electrical capacity is currently being used by the building or property.
It then determines how much capacity remains available for EV charging.
When other electrical loads increase, the charging system can reduce EV charging power.
When other loads decrease, more power may become available for charging.
This allows EV charging to respond to changing site conditions rather than operating within a permanently fixed allocation.
How Does Dynamic Load Balancing Work?
A dynamic load balancing system typically follows four basic steps:
- Measure Site Electricity Demand: A meter, current transformer, or similar monitoring device measures the electrical demand of the site.
- Calculate Available Capacity: The system compares current site demand with the configured electrical limit. The remaining capacity can then be made available for EV charging.
- Adjust EV Charging Power: If other electrical loads increase, EV charging power can be reduced. If electrical demand falls, more power may be allocated to EV charging.
- Repeat Continuously: The process is repeated as site demand changes. This allows the charging system to respond dynamically throughout the charging session.
What Equipment Is Needed for Dynamic Load Balancing?
Dynamic load balancing generally requires three functions:
- Energy Measurement: The system needs a way to measure real-time electrical demand. Depending on the installation, this may involve an energy meter, current transformer, or another compatible monitoring device.
- Communication and Control: Measured data must be communicated to a controller, charging system, or charger that can determine the available charging capacity.
- Compatible EV Charging Equipment: The EV charger must be able to adjust charging power according to the control signal or configured energy management logic. The exact system architecture varies depending on the charger, electrical installation, communication method, and energy management solution. For this reason, installers should verify device compatibility and installation requirements before deploying dynamic load balancing. For example, the BS20 is available with compatible dynamic load balancing and solar charging configurations.
Static vs. Dynamic Load Balancing: Key Differences
The main difference between static and dynamic load balancing is how EV charging power is controlled.
Static load balancing works within a fixed charging allocation. Dynamic load balancing adjusts charging power according to real-time site demand.
| Factor | Static Load Balancing | Dynamic Load Balancing |
|---|---|---|
| Power allocation | Fixed or predefined | Adjusts in real time |
| Site monitoring | Usually not required | Required |
| Response to changing building load | Does not automatically adapt | Adjusts as demand changes |
| Use of available electrical capacity | More conservative | More flexible |
| System complexity | Lower | Higher |
| Additional equipment | Usually limited | May require meter, CT, controller, or compatible communication |
| Multiple charger support | Possible, depending on system design | Well suited to changing multi-charger demand |
| Scalability | More limited | Better for sites with variable or growing demand |
| Typical application | Stable, predictable loads | Variable residential or commercial loads |
| Potential impact on electrical upgrades | May require more reserved capacity | May reduce the need for immediate capacity upgrades in some projects |
The best choice depends on the electrical system, charging demand, number of chargers, and how much the site load changes over time.
Static load balancing is usually easier to deploy, while dynamic load balancing provides more flexibility when available capacity changes throughout the day.
Example: How Dynamic Load Balancing Responds to Changing Demand
A simplified example can show the difference more clearly.
Assume a property has a maximum electrical limit of 63 A.
At one point in the day, other electrical loads are using 20 A. This leaves approximately 43 A available before the site reaches its configured limit.
A dynamic load balancing system can allow the EV charger to use more of this available capacity.
Later, if household or building demand increases to 40 A, the available capacity for EV charging becomes lower.
The system can then reduce charging current accordingly.
When the other loads decrease again, more charging capacity can become available.
The logic can be summarized as:
Configured Site Limit
↓
Current Site Demand
↓
Remaining Available Capacity
↓
EV Charging Power
This example is simplified. Actual system behavior depends on the electrical design, charger configuration, monitoring method, control logic, and applicable installation requirements.
Static or Dynamic Load Balancing: Which Should You Choose?
There is no single load balancing method that is best for every EV charging project.
The right choice depends on how predictable the electrical demand is, how much spare capacity is available, and whether the charging system needs to adapt as site conditions change.
Static Load Balancing May Be Suitable When:
Static load balancing may be a practical choice if:
- Site electricity demand is relatively stable
- Enough electrical capacity can be reserved for EV charging
- Charging demand is predictable
- Only one or a small number of chargers are installed
- Simpler installation and control architecture are preferred
- Future expansion is limited
In these situations, a fixed charging allocation may provide sufficient control without continuous site monitoring.
Dynamic Load Balancing May Be More Suitable When:
Dynamic load balancing may be more appropriate if:
- Building electricity demand changes significantly throughout the day
- EV charging shares capacity with other high-power equipment
- The site has limited spare electrical capacity
- Several EV chargers operate at the same location
- The charging system needs to respond automatically to changing demand
- Future expansion is expected
- The project aims to use existing electrical capacity more efficiently
Dynamic load balancing can be particularly useful where reserving a large fixed charging capacity would be impractical or unnecessarily restrictive.
However, dynamic systems generally require more monitoring, communication, and configuration than static systems.
Dynamic Load Balancing for Homes vs. Commercial Sites
Dynamic load balancing can be used in both residential and commercial charging environments, but the reasons for using it are often different.
Residential EV Charging
In a home, EV charging may operate alongside other high-power loads such as:
- Heat pumps
- Electric ovens
- Water heaters
- Air conditioning
- Electric heating systems
These loads do not operate at full power all the time.
Dynamic load balancing can monitor household demand and adjust EV charging power according to the capacity currently available.
This can be useful in homes where the electrical supply has limited spare capacity or where several high-power appliances may operate at the same time.
For residential users, the main objective is usually to manage charging without exceeding the property’s available electrical capacity.
Commercial EV Charging
Commercial sites often have more complex and variable electrical demand.
Examples include:
- Offices
- Apartment buildings
- Hotels
- Retail sites
- Car parks
- Fleet depots
- Educational facilities
- Industrial sites
At these locations, charging demand may change according to vehicle arrivals, working hours, building operation, and the number of chargers in use.
Dynamic load balancing can help coordinate EV charging with other site loads and make more effective use of the available electrical capacity.
This becomes especially relevant when multiple chargers are installed or when future expansion is planned.
For commercial projects, load balancing is often part of a broader charging infrastructure strategy that may also include access control, energy monitoring, charging schedules, and remote management.
Dynamic Load Balancing vs. Smart Charging
Dynamic load balancing and smart charging are related, but they are not the same thing.
Dynamic load balancing focuses on electrical capacity.
Its main purpose is to adjust EV charging power according to the amount of capacity currently available at the site.
Smart charging is a broader concept. 4
Depending on the charging system, smart charging may include:
- Charging schedules
- Remote control
- Energy monitoring
- Tariff-based charging
- User access management
- Dynamic load balancing
- Solar energy integration
- Other energy management functions
In simple terms: Dynamic load balancing is one type of smart energy management function used in EV charging.
A charger can include smart features without necessarily having dynamic load balancing.
Likewise, a dynamic load balancing system may focus primarily on power management rather than the wider set of smart charging functions.
Related reading: Smart EV Charging Explained
Can Dynamic Load Balancing Work With Solar EV Charging?
Yes. Dynamic load balancing and solar EV charging can be used within the same energy management system, but they solve different problems.
Dynamic load balancing focuses on available electrical capacity.
Solar charging focuses on how available solar energy is used for EV charging.
For example, a charging system may monitor both:
- Current building electricity demand
- Available solar generation
The system can then adjust EV charging according to the configured energy management strategy.
This can allow charging power to respond not only to site demand, but also to changes in solar generation.
However, solar charging and dynamic load balancing should not be treated as the same function.
Their roles can be summarized as follows:
| Function | Main Purpose |
|---|---|
| Dynamic Load Balancing | Manage EV charging within available site electrical capacity |
| Solar Charging | Use available solar energy for EV charging |
| Combined Energy Management | Coordinate charging with both site demand and available solar generation |
For projects that require both functions, the EV charger, monitoring equipment, communication method, and energy management configuration must be compatible.
Explore: BESEN Dynamic Load Balancing & Solar Charging
Does Dynamic Load Balancing Always Make EV Charging Faster?
No.
Dynamic load balancing does not guarantee faster charging at every moment.
Its purpose is to make better use of the electrical capacity that is available.
When site demand is low, the charger may be able to use more power.
When other electrical loads increase, charging power may be reduced.
This means charging speed can vary during a charging session.
The advantage is flexibility: charging power can respond to actual site conditions instead of remaining permanently restricted by a conservative fixed limit.
Can Dynamic Load Balancing Prevent Electrical Overload?
Dynamic load balancing can help reduce the risk of EV charging pushing total site demand above a configured electrical limit.
However, it should not be described as the only protection against electrical overload.
A safe EV charging installation also depends on:
- Correct electrical design
- Appropriate wiring
- Circuit protection
- Charger configuration
- Installation quality
- Applicable electrical codes and local regulations
Dynamic load balancing is therefore an energy management function, not a replacement for electrical protection systems.
Does Dynamic Load Balancing Require a Smart Meter?
Not always.
Dynamic load balancing requires a way to measure electrical demand, but the measurement method depends on the system design.
This may involve:
- An energy meter
- Current transformers
- A compatible monitoring device
- A building energy management system
The purpose is the same: the charging system needs reliable information about current site demand before it can adjust charging power.
A utility smart meter and a load balancing meter should not automatically be treated as the same device.
Can Dynamic Load Balancing Manage Multiple EV Chargers?
Yes, depending on the charging system.
In a multi-charger installation, dynamic load balancing can be used to manage the total power available to EV charging and distribute that capacity between active chargers.
The exact allocation method depends on the charging system.
Some systems may distribute power equally, while others may use different priorities or control logic.
For commercial projects, multi-charger load management can help support more charging points without requiring every charger to operate at maximum power at the same time.
Does Dynamic Load Balancing Work With Single-Phase and Three-Phase Charging?
Dynamic load balancing can be used with both single-phase and three-phase EV charging systems, provided the charging equipment and monitoring solution are designed for the relevant electrical configuration.
In three-phase installations, phase loading may also need to be considered.
The exact installation requirements depend on the charger, electrical system, monitoring equipment, and local standards.
Related reading: What Is Three-Phase Power in EV Charging?
Frequently Asked Questions
Is Dynamic Load Balancing Necessary for One EV Charger?
Not always. If a property has sufficient spare electrical capacity and electricity demand is relatively predictable, a fixed charging limit may be enough.
Dynamic load balancing becomes more useful when the charger shares limited electrical capacity with other high-power loads or when site demand changes significantly throughout the day.
Does Dynamic Load Balancing Make EV Charging Faster?
Not necessarily.
Dynamic load balancing does not increase the maximum charging capability of the EV or charger. Instead, it allows charging power to adjust according to the capacity currently available at the site.
When building demand is low, more power may be available for EV charging. When other loads increase, charging power may be reduced.
Can Dynamic Load Balancing Prevent Electrical Overload?
Dynamic load balancing can help keep EV charging within a configured electrical limit by reducing charging power when other site loads increase.
However, it does not replace proper electrical design, circuit protection, wiring, or installation requirements.
Does Dynamic Load Balancing Require a Smart Meter?
Not necessarily.
Dynamic load balancing requires a method of measuring site electricity demand, but this may involve an energy meter, current transformer, compatible monitoring device, or building energy management system.
A utility smart meter and a load balancing meter are not necessarily the same device.
Can Dynamic Load Balancing Manage Multiple EV Chargers?
Yes, depending on the charging system.
In a multi-charger installation, available charging capacity can be managed across several active chargers. The exact distribution method depends on the system configuration and control logic.
Does Dynamic Load Balancing Work With Single-Phase and Three-Phase Charging?
Yes, provided the charger and monitoring system support the relevant electrical configuration.
For three-phase systems, phase loading may also need to be considered as part of the installation design.
Can Dynamic Load Balancing Work With Solar Panels?
Yes.
Dynamic load balancing and solar charging can operate within the same energy management system. Dynamic load balancing manages charging according to available site capacity, while solar charging determines how available solar generation is used for EV charging.
Key Takeaways
- Static load balancing uses a fixed EV charging allocation.
- Dynamic load balancing adjusts charging power according to real-time site demand.
- Static systems are simpler, but dynamic systems use changing electrical capacity more flexibly.
- Dynamic load balancing can be valuable for homes, commercial sites, and multi-charger installations with variable demand.
- Load balancing manages electrical capacity; it does not replace circuit protection or proper electrical design.
- Dynamic load balancing can also work alongside solar charging as part of a broader energy management system.
Conclusion
Static and dynamic load balancing both help manage the electrical capacity available to EV charging, but they use different control strategies.
Static load balancing works with a predefined charging allocation. It is generally simpler and may be sufficient when site demand is predictable and adequate capacity can be reserved for charging.
Dynamic load balancing responds to real-time electrical demand. It is better suited to sites where available capacity changes, multiple high-power loads operate at the same time, or EV charging needs to scale without relying entirely on fixed power allocation.
The choice should therefore be based on the electrical characteristics of the site, expected charging demand, system complexity, future expansion plans, and the level of energy management required.
For projects that also need to coordinate EV charging with solar generation, load balancing can form part of a broader energy management strategy.
Need Dynamic Load Balancing and Solar Charging?
BESEN’s DLB and Solar Charging solution combines real-time load management with solar energy integration for compatible EV charging applications.
Explore DLB & Solar Charging →
- Explains that EV charging infrastructure must have sufficient electrical power available for installed and future chargepoints, which may require supply upgrades, load balancing solutions, or upgrades to the building’s electrical control system.[↩]
- Defines home load balancing as adjusting EV charging to help avoid overloading the home’s electricity supply.[↩]
- Describes smart charge management as the dynamic coordination of EV charging in response to charging demand and building loads, helping address limited electrical capacity and potentially reduce the need for costly infrastructure upgrades.Smart charging is a broader concept.[↩]
- Explains that smart charging can control the timing and rate of EV charging and schedule charging according to user requirements and conditions on the electricity system.[↩]
