How does dynamic load management work for EV charging?

Dynamic load management adjusts electric vehicle charging as other electricity demand on your site changes. Welsh Government guidance distinguishes this from a static charging limit [S1]. If an illustrative 40 kW site limit leaves 20 kW after building demand, that remainder is shared between vehicles. It can improve use of existing capacity, but cannot create extra energy. Checked October 2026.

Last checked 16 October 2026

What is dynamic load management for EV chargers?

Dynamic load management (DLM) changes electric vehicle (EV) charging power as electricity demand elsewhere on your site changes. It accounts for other building loads, rather than treating the whole connection as available for cars. Welsh Government procurement guidance describes the difference from static control [S1].

A kilowatt (kW) measures power. A kilowatt-hour (kWh) measures energy delivered over time: constant power of a kilowatt for an hour supplies a kilowatt-hour [S4]. DLM mainly controls the power available now. Your operational question remains how much energy vehicles receive before they leave.

Imagine your kitchen switches on while guests are charging. The charging allowance may need to fall. When building demand drops, more of the available supply can go to vehicles. Real-time site monitoring enables that adjustment [S1], [S2].

Start with how much power your site has. Ask your installer to establish the usable charging allowance before selecting the number or rating of chargers.

What is the difference between static and dynamic load balancing?

A static system works within a predetermined allocation for charging. It can share that allocation between vehicles, but does not respond to changing building use in the way a dynamic system does. Dynamic control updates the allocation using changing site conditions [S1].

This comparison follows Welsh Government and Energy Saving Trust explanations [S1], [S2]. Product labels vary, so ask for a diagram and a written operating description. A system that shares power only between chargers may not also measure what the rest of your building is using.

For a pub with variable kitchen demand, request an evening-service scenario. For a depot, request the period when vehicles return and the workshop is still operating. For an office, include heating and other planned electrical equipment in the survey brief.

How is limited power shared between charging vehicles?

This is an illustration, not a quote or an electrical design. Assume a designer has established a 40 kW operating limit for the simplified site. There are four compatible chargers and four vehicles, each able to accept 7 kW. Assume equal sharing, balanced loads and no losses. The chosen numbers are not recommended settings for your premises.

The arithmetic is site limit minus other demand, capped by what the chargers and vehicles can use. In the last row, four vehicles accepting 7 kW use 4 × 7 = 28 kW. The spare 4 kW cannot make those vehicles accept more. This illustrates the sharing principle described in the procurement guidance [S1].

If the middle row lasts for an assumed two hours, each vehicle receives 5 × 2 = 10 kWh before losses [S4]. A vehicle needing an assumed 20 kWh would still have 10 kWh to receive. Equal sharing therefore does not, by itself, establish that every departure requirement will be met.

Ask whether your proposed system divides power equally, prioritises departures or uses another policy. Have the installer demonstrate that policy with your arrival times and energy requirements. Include a scenario where an urgent vehicle joins late rather than assuming every vehicle arrives together.

Can load management avoid a grid upgrade?

It can help use spare capacity, particularly when building demand drops outside working hours. Energy Saving Trust explains that dynamic management can allow more vehicles to charge within existing capacity [S2]. That is an option to assess, not a conclusion that every site can avoid connection work.

Check both power and energy. In a further illustration, suppose charging has only 20 kW available for four hours. The energy ceiling is 20 × 4 = 80 kWh before losses [S4]. If the vehicles need an assumed 100 kWh, no allocation policy can make the missing energy appear in that window.

Your choices might include a longer charging window, a different service requirement or more supply. Compare these in load management versus a grid upgrade. A distribution network operator (DNO) runs the local electricity network; involve it through the connection assessment rather than relying on the charger count alone [S3].

What should a site owner ask before signing?

Request the intended site limit, the charging allocation and the measurement locations. Ask your installer to explain any limits on individual electrical phases and how future building loads change the design. The simple table above is not a substitute for that electrical assessment.

Ask for commissioning evidence showing demand increasing and charging reducing. Also request the specified response to a monitoring or communications fault, the route for support and the cost of maintaining the control system. Record these as requirements in your purchase or operating agreement.

Compare proposals using the same required energy by departure, rather than the same number of sockets. Use the charging-time guide and fleet sector guide to prepare the schedule. Then review commercial charger costs and funding options. For fully funded, part funded or self funded arrangements, ask who pays for monitoring, controls and ongoing support.

What should you do next?

Collect your building demand records, future electrical loads and vehicle schedules. Use those when you get matched with an installer that covers your area for a capacity assessment.

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