What Are EV Load Share Devices?

EV load share devices are control components or integrated systems that limit, allocate, or balance charging current so connected EV chargers do not exceed the available capacity of a panel, feeder, or service. In practical terms, they let a site use existing infrastructure more efficiently. Depending on the product, the device may monitor total building demand, communicate between chargers, or apply a fixed group limit across several charging ports. This is especially useful where the owner wants Level 2 charging but the existing electrical system has limited spare ampacity. In some projects the load sharing function is built into the charger ecosystem, while in others it relies on external metering, current transformers, controllers, or software-based energy management.

Where Are EV Load Share Devices Used?

These devices are commonly used in detached homes with smaller services, townhomes, older houses with electric heat, and garages where adding a large dedicated EV circuit may push service capacity too far. They are also widely used in condos, apartment buildings, workplaces, fleet yards, visitor parking, and mixed-use properties where many chargers must share a limited electrical allocation. For commercial and multi-residential work, load sharing can be the difference between installing a few chargers and installing a practical number of charging points. They are also useful in retrofit projects where trenching, transformer upgrades, or utility coordination would otherwise drive the project cost much higher.

How To Choose EV Load Share Devices

Start with the site constraint. If the issue is a single dwelling with limited main service capacity, look for a system designed for whole-home or service-based load management. If the issue is two or more chargers on one branch or feeder, look for charger load sharing within the same platform. If the project is a condo or commercial parking area, check whether the system can manage multiple chargers, user access, and future expansion. Then confirm the electrical details: service voltage, single-phase or three-phase arrangement where applicable, maximum allowable charging current, breaker configuration, and whether the system requires external metering or communications hardware. Also verify whether the charger and load share device must be from the same brand family. Some ecosystems are straightforward when kept within one manufacturer, while cross-brand integration may be limited or unavailable. For property owners, it is also worth checking whether the system can prioritize fairness, first-come charging, scheduled charging, or demand-limited charging windows.

Trade Rules Of Thumb

A practical rule of thumb is that load sharing makes the most sense when the cost of controls is lower than the cost of upgrading the service, transformer, distribution equipment, or civil work. In residential work, it is often worth considering when a 200 A service is already carrying electric heat, air conditioning, hot water, or other large loads. In multi-charger projects, a common planning approach is to assume not every vehicle charges at full output at the same time, which is why managed charging can support more ports than a simple one-breaker-per-charger layout. Another useful rule is to leave room for future expansion in both the electrical design and the control platform. A system that works for two chargers today may need to support six or twenty later. These are planning guidelines only, not code rules, and actual demand calculations and equipment ratings must be verified for the specific installation.

Sizing Guidelines

For sizing, first determine the maximum capacity available to EV charging after considering the existing service or feeder load. Then decide whether the load share system will cap one charger, balance two chargers, or manage a larger charger group. As a typical example, if two chargers share a fixed current limit, each charger may deliver full output when used alone and automatically reduce output when both are active. In a whole-home load management setup, the charger output may ramp down when the house load rises and ramp back up when capacity becomes available. For condo and commercial projects, group limits are often set at the panel, floor, or parking area level. The key buying point is that the control system, charger settings, breaker sizing, conductor sizing, and available ampacity all need to align. Do not size conductors or overcurrent devices based on hoped-for throttling alone unless the equipment listing, control method, and applicable code treatment clearly support that design approach. Final sizing should be confirmed by the engineer of record or qualified designer where required, and accepted by the authority having jurisdiction.

Common Installation Practices

Common practice is to mount monitoring and control components where they are accessible for commissioning and service, usually near the distribution equipment or as specified by the manufacturer. Current transformers, if used, should be installed with correct orientation and on the intended conductors only. Communication wiring or network setup should be planned early, especially in parkades, concrete structures, or outdoor installations where signal reliability can become the real project bottleneck. Installers also typically document charger grouping, current limits, and commissioning settings clearly inside the panel schedule or project closeout package. On retrofit jobs, it is good practice to verify actual site loads before final programming rather than relying only on assumptions from nameplate data. As with any EV charging installation, bonding, overcurrent protection, environmental rating, and disconnecting means must follow the equipment instructions and applicable code requirements.

Common Mistakes

One common mistake is assuming every EV charger can load share with every other charger. Many systems only work within the same manufacturer ecosystem or even within specific product families. Another mistake is confusing energy management with simple current limiting. A charger set to a lower output is not the same as a dynamic system that responds to changing building load. Installers also run into trouble when they overlook communications requirements, firmware setup, metering hardware, or internet dependency. In larger projects, underestimating future charger growth is another frequent issue. A design that fills the panel today but leaves no room for expansion can become expensive later. It is also a mistake to treat load sharing as a substitute for proper demand calculations, feeder review, and coordination with the owner, utility, and authority having jurisdiction.

Brand Comparisons

Charge Point is commonly considered when the project needs a recognized EV charging platform with broader commercial familiarity, network features, and a path for managed multi-port installations. It may be preferred where the owner wants a more established ecosystem, reporting capability, or consistency across multiple sites. Breeze EV may be attractive where the project needs a practical load management solution with a simpler scope or where value and straightforward deployment are priorities. The right choice depends less on brand name alone and more on charger compatibility, commissioning workflow, support expectations, and whether the owner wants a basic local solution or a more connected charging platform. If a site already has installed equipment from one of these brands, staying within that ecosystem may reduce setup issues and simplify support. For new projects, compare not only hardware cost but also software, accessories, metering needs, and long-term expansion options.

Related Products

EV load share devices are often purchased alongside EV chargers, pedestal mounts, wall mounts, current transformers, metering accessories, communication hardware, disconnects, breakers, load centres, surge protection, and signage. Depending on the installation, you may also need conduit, fittings, wire, cable supports, bollards, and weatherproof enclosures. In multi-residential and commercial work, network accessories, access control, and billing-related components may also be part of the package. When quoting a project, it is worth reviewing the full charger bill of material rather than treating the load share device as a stand-alone item.

Frequently Asked Questions

Do EV load share devices eliminate the need for a service upgrade?

Not always, but they can often delay or avoid one when the available capacity is close to adequate and the charging load can be managed. If the existing service is already heavily loaded, a service upgrade may still be required.

Can I use any EV charger with any load share device?

No. Many load sharing functions are brand-specific or product-family-specific. Always confirm compatibility between the charger, controller, metering hardware, and software platform before purchase.

Are EV load share devices mainly for commercial projects?

No. They are useful in homes as well, especially where panel or service capacity is limited. They are also very common in condos, apartments, workplaces, and fleet charging sites.

Will charging become much slower with load sharing?

It depends on how many vehicles are charging at the same time and how the system is configured. A shared system may reduce output during peak use, but it can still be a practical way to add more charging access without major electrical upgrades.

What should I verify before ordering?

Check service voltage, available capacity, charger compatibility, number of chargers, communication requirements, metering needs, enclosure rating, and whether the owner wants local control, network management, or future expansion capability.

Do load share devices affect breaker and conductor sizing?

They can affect the overall design approach, but breaker and conductor sizing must still follow the equipment listing, manufacturer instructions, and applicable code requirements. Do not assume software control alone changes basic installation requirements without confirming the approved design basis.