AI overview
Most commercial sites do not need a supply upgrade to install EV charging. They need the chargers to share the capacity that already exists. Load management balances demand across the bays and against the building, keeping the site inside its limit while vehicles still leave full, because vehicles are parked far longer than they need to charge.
Key highlights
- A supply upgrade is the most expensive answer and rarely the necessary one
- Chargers that share capacity keep the site inside its existing limit
- Vehicles sit far longer than they need to charge, so slower is not slower
- Building load takes priority; charging is the load that can wait
- Brand agnostic control avoids locking the site to one manufacturer
- Test for control before you pay for capacity
The assumption worth testing
The reasoning behind most upgrade quotes goes like this: ten chargers at 22kW is 220kW, the site has 150kW, therefore the site needs more power.
It is arithmetic, and it is wrong, because it assumes every charger draws its maximum at the same moment for the whole time it is connected. That is not how a carpark behaves.
What load management actually does
It gives the chargers awareness. Of each other, and of the building they are attached to.
When six vehicles plug in at once, the available capacity is shared between them. When the building's own demand rises at midday, the charging backs off and gives way. When the office empties in the evening, the vehicles take what is left.
- Shares capacity dynamically across every connected bay
- Gives the building's own load priority over charging
- Keeps total site draw inside the existing supply limit
- Catches up overnight when nothing else is drawing
But will the cars actually be charged
This is the fair question, and the answer is in the parking, not the charging.
A vehicle that arrives at eight and leaves at five is connected for nine hours. Most of them need two or three. Even sharing capacity between six bays, every one of them is full long before anybody comes back for it.
Where the window is genuinely tight, a depot with a two hour turnaround for instance, the answer changes and DC enters the conversation. That is a design decision, and it is why the run sheet matters more than the brochure.
When an upgrade is the right answer
Sometimes it is. A site running DC fast charging for public use, or a depot turning vehicles around inside a short window, can genuinely exceed what the service can deliver.
The point is not that upgrades are never needed. It is that the upgrade should be the conclusion of an assessment, not the opening assumption of a quote.
