EV Charging Strategies

An EV charging strategy is the logic used for distributing the available charging capacity among electric vehicles (EVs) charging at a given site. EV charging strategies are applied to deal with scarce capacity. This is essential as charging infrastructure quickly exceeds the capacity of local grid connection points. Thus, uncontrolled charging can lead to overloads, higher costs and carbon emissions, and the inability to fulfil mobility needs.

Goals

An electric vehicle (EV) charging strategy may aim at one or more goals, for example:

• Minimizing costs
• Minimizing charging time
• Maximizing fairness
• Minimizing emissions

In practice, these goals often conflict (e.g. faster charging speeds usually increase costs), making it crucial for a charging site operator to select a particular EV charging strategy that suits their specific requirements.

An EV charging strategy for each use case

Each of the following strategies is designed specifically for electric vehicle charging infrastructure (EVCI). Depending on the site type, operator requirements and driver needs, the right strategy – or combination of strategies – can make the difference between a charging park that struggles under load and one that runs reliably and cost-efficiently.

Priority charging

Goal: Meeting mobility needs

Logic‍

As the name suggests, priority charging allows one or more charging points to be given preference. Specific charge points are prioritized in the distribution of available power. This means that vehicles at prioritized charging points receive maximum charging power, while the remaining capacity is distributed among the other charge points in the charging park. Prioritized charge points are also the last to be restricted in the event of bottlenecks – i.e. their charging power will only be affected after all non-prioritized charge points have been completely shut off. With gridX’s energy management, priority charging can easily be switched on or off, according to users’ needs.

In practice‍

Priority charging is particularly suitable for locations where some EV drivers should have priority. For example, this charging strategy is used in parking garages of office buildings for people with specific mobility needs – for example, employees, who work in the field probably have less time to charge than others. Priority charging is also useful for delivery vehicles that need to make trips at short notice.

Balanced charging

Goal: Maximizing fairness

Logic: In balanced charging, the energy management system distributes the available power evenly to all the connected charge points. It also guarantees balance at the level of each individual electrical phase. If no charging stations are prioritized, the power is distributed evenly among all charge points. If individual charge points are prioritized, the remaining power is evenly distributed among the other charge points. The maximum limits per phase, as well as the total load limits, are always respected. Due to slightly different power modulation at each charging station, small differences between vehicles may occur.

In practice: Balanced charging is a widely used EV charging strategy that can be applied to most types of charging locations. It is particularly suitable when the mobility needs of EV drivers are unknown or when all EVs should have the same priority. Therefore, balanced charging is often used in office buildings, residential complexes or public charging parks.

User-based prioritization

Goal: Meeting mobility needs based on driver priority levels

Logic

‍User-based prioritization takes the concept of priority charging a step further by tying charging power allocation directly to the priority level of the EV driver rather than the charge point itself. Priority levels are sourced from a third-party system and can reflect a range of classification models: for example, membership tiers (Basic, Standard, Premium) in a commercial charging context, or organizational hierarchy in a workplace setting (e.g. C-level executives receiving the highest priority, followed by employees, then guests). When a driver plugs in, the system identifies their priority level and allocates charging power accordingly, higher-priority users receive preferential capacity, while remaining power is distributed among lower-priority sessions.

In practice

‍User-based prioritization is well suited to office charging parks where role-based access is already managed through an existing human resources (HR) or access control system, as well as to charge point operators-managed public or semi-public sites where membership plans determine service tiers. It brings fairness and business logic together, ensuring that those with the greatest mobility needs – as defined by the operator – are always served first.

Time-of-use (ToU) optimization

Goal: Minimizing charging costs

Logic

‍Time-of-use optimization introduces a rule-based cost-reduction objective to EV charging. The energy management system optimizes charging across all connected EVs at the grid connection point (GCP) level, using 24-hour day-ahead electricity prices to shift charging load toward the cheapest available time windows. Rather than charging all vehicles immediately upon connection, the EMS intelligently schedules and distributes power to minimize total energy costs over the course of the day. Since departure times and target states of charge are not provided directly by users in this initial implementation, the system works from a configured average EV parking duration for the site.

In practice

‍ToU optimization is particularly valuable for charge point operators (CPOs) who want to reduce energy expenditure without compromising on vehicle readiness. Sites with longer average dwell times such as workplace charging parks or overnight fleet depots – offer the greatest optimization potential, as the system has more flexibility to shift load away from peak-price periods.

Home energy management system (HEMS) use cases

While the strategies above apply specifically to electric vehicle charging infrastructure (EVCI), the following variations are HEMS use cases‍. They involve EV charging as part of a broader residential energy setup, where the vehicle interacts with local power generation like photovoltaic (PV) and other household loads.

PV surplus charging

Goal: Minimizing emissions

Logic‍

PV surplus charging uses surplus PV electricity to charge EVs. This charging strategy ensures that locally generated PV power is maximally utilized by only charging electric vehicles when PV surplus is available, thereby lowering costs and emissions. However, to ensure that mobility needs are also met, additional power can be drawn from the grid to ensure that all cars receive their minimum desired state of charge. 

In practice‍

PV surplus charging can be activated or scheduled during periods of high PV generation that is sufficient to charge connected EVs. This strategy is suitable for locations that prioritize sustainability, such as homes or office buildings.. 

Scheduled charging

Goal: Minimizing emissions while meeting mobility needs

Logic‍

Scheduled charging is a suitable strategy for charging EVs at locations, where the charging power must be limited to a fixed kilowatt output. This could be due to dynamic tariffs that create value by charging at night time, the coordination of EV charging with local PV production, or to align with signals from grid operators. Avoiding charging during peak periods to minimize grid fees can also be a motivation for scheduled charging. 

In practice‍

Scheduled charging is suited to locations where the parking duration of EVs are usually significantly longer, and if the mobility needs, such as departure time, required range (in km) or the required state of charge (in percent), are known. Scheduled charging can also be combined with local PV production, as was successfully implemented in a pilot project with MAINGAU Energie GmbH.

Expert insight and outlook

The next phase of EV charging will be defined not by whether infrastructure exists, but by how intelligently it is managed. Charging parks are already being deployed at scale across offices, residential complexes, logistics hubs and public locations. The question operators now face is how to allocate limited grid capacity fairly, efficiently and cost-effectively across an increasingly diverse mix of drivers, vehicles and energy market conditions.

As Philip Grant, Product Manager of EVCI at gridX, puts it: "A well-designed EV charging strategy is one of the clearest wins available to a CPO today. It doesn't require more hardware or a bigger grid connection. It means making smarter use of what's already there. Operators who get this right reduce costs, avoid overloads and keep every driver satisfied. That's a compelling return on a software decision."

This reality is already reshaping how operators think about charging. Rather than treating all vehicles and drivers as equal loads, modern strategies account for who is charging, when they need to leave, and what the electricity market looks like at any given hour. User-based prioritization brings driver identity and business logic into the distribution of power. Time-of-use optimization connects charging behavior to real-time price signals, reducing costs without compromising on vehicle readiness.

What unites all of these strategies is the role of the energy management system in executing them reliably. No single strategy fits every site or every operator. But with the right EMS in place, charging sites can move from reactive load management to proactive, intelligent coordination, turning a potential grid bottleneck into a competitive advantage.

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