Load Management & Smart Charging Rules
Load management is what makes fleet electrification fit inside the electrical supply you already have — and UK regulation now assumes charging is smart. Here is the engineering and the rulebook, in usable form.
The problem load management solves
Charger nameplate ratings terrify supply calculations. Ten 22kW sockets nominally demand 220kW — more than many sites' entire agreed capacity — and a naïve design either curtails the project or buys a six-figure supply upgrade. The reality is gentler: vehicles dwell for hours, need only a fraction of that energy, and tolerate any charging shape that finishes by departure. Static limits cap each charger crudely. Dynamic load management does it properly: real-time measurement of total site demand, with charger output adjusted continuously so the site rides just under its capacity ceiling. Sites routinely run three to five times more sockets than a nameplate calculation would permit, on the supply they already have.
Solar-following: the profitable configuration
The same control loop that protects the supply ceiling can chase the generation curve. With solar on site, the controller reads surplus generation and steers charging power into it — vans absorb the midday peak the building can't use, export collapses, and the solar share of vehicle energy climbs into the 30–60% band on daytime-dwell fleets. Configured against departure schedules, none of this costs a single incomplete charge. It is the connective tissue between the array and the combined business case, and it is software configuration, not extra hardware — provided the chargers were specified OCPP-compliant in the first place (see the hardware guide).
The regulatory layer: what is actually required
The Electric Vehicles (Smart Charge Points) Regulations 2021 made smart functionality a point-of-sale requirement for chargepoints intended for domestic and workplace use in Great Britain: charging must be capable of responding to signals, default scheduling and randomised delay provisions apply, and units must meter and communicate. A second phase added device-level security requirements. For a commercial buyer the consequence is simple: compliant hardware is the market norm, and the procurement question is evidencing compliance, not achieving it.
Electrical installation rules run alongside: BS 7671 (including its EV charging section) governs the installation itself, and new chargepoint circuits interact with the DNO through load notification or assessment procedures — bundled into one engagement on combined solar-and-charging projects. What is not required, despite persistent sales folklore: there is no obligation on a workplace to operate chargers publicly, no mandatory tariff structure, and no requirement to install a battery. The rules shape the hardware; your operation stays yours.
Specifying it right the first time
Four lines belong in every tender. OCPP-compliant chargers (vendor-portable forever). A dynamic load controller with CT metering at the supply intake (the measurement that makes everything work). Solar-following mode configured against real generation metering, not estimates. And commissioning evidence: a witnessed test demonstrating the site holds under its capacity ceiling with all sockets active. Skipping the fourth line is how "load managed" sites end up tripping main breakers in February. The depot guide applies all of this at fleet scale, where the stakes are a depot that either runs or doesn't.
Load management questions
What is dynamic load management in plain terms?
A controller measures total site demand in real time and adjusts charger output so the site never exceeds its supply capacity. When the bakery ovens fire up, the vans charge slower; when the building quietens, they speed up. Vehicles still leave full because they are parked far longer than they need to charge. It is the difference between needing a £100,000 supply upgrade and not.
Do the Smart Charge Points Regulations apply to workplace chargers?
The Electric Vehicles (Smart Charge Points) Regulations 2021 primarily target chargepoints sold for domestic and workplace use, imposing smart functionality, default off-peak scheduling and randomised delay at the point of sale. Commercial fleet-depot equipment and public chargepoints sit partly outside the strictest provisions. The practical position for buyers: every reputable workplace unit sold in 2026 ships compliant, and your installer should evidence it rather than ask you to take it on trust.
Will load management make vehicles leave under-charged?
Not on a competently configured site. The controller works against departure schedules: every vehicle's required energy and plug-out time are known, and power is allocated to guarantee completion with margin. Constraint only bites when the arithmetic was impossible anyway — at which point you have a sockets or supply problem, which the design phase exists to catch.
Can load management prioritise solar power for charging?
Yes — solar-following is a standard mode in serious platforms. The controller reads generation surplus from the metering and biases charging power into it, lifting both the solar share of vehicle energy and the array's self-consumption. On sites with daytime vehicle dwell it is the single highest-value configuration choice in the whole system.