How can a business add EV chargers without a grid upgrade?

You want EV chargers for your business, but the connection is too small? A heavier connection is not always needed. First work out how much power the chargers really ask, taking into account simultaneity and your measured quarter-hour consumption. If your fleet mainly charges at night, dynamic load management is often enough: the chargers share the power that is left. If you want fast charging during the day, a business battery absorbs the peaks and your connection stays as it is. Only when the extra demand stays above your limit for hours a day is an upgrade or a medium-voltage cabin the right choice.

The vans are going electric, the company cars too, and a visitor asks where to plug in. The installer adds up ten chargers of 11 kW and a fast charger, arrives at 160 kW and says the connection must be upgraded. The grid operator then talks about a study, a cabin and a waiting time nobody can pin down.

What that sum hides: ten chargers almost never draw full power at the same time, and the real shortfall is often a short daily peak that a battery can cover. A farm in Tielt faced the same wall: its connection was too small to grow, and the next step would have been medium voltage. A battery system now gives the site more power, so a heavier connection was not needed.

How much power do EV chargers for a business really need?

If you plan a charging point for your business, you start with three numbers: the power per charging point, the number of charging points and the simultaneity. The power of an AC charger follows from the physics of your three-phase connection (3 x 400 V):

Ten chargers of 11 kW are 110 kW on paper. In practice they rarely all charge at full power at the same time. Cars arrive at different moments with a different state of charge, and some only need a few hours. So the real extra power depends on your driving profiles, not on the sum. Do you also charge forklifts? Read how to charge forklifts from your own solar power without a heavier connection.

Put that number next to your measured quarter-hour values at the connection. Only then do you see whether there is room, at which hours, and how much.

Why does your grid connection become too small?

Charging infrastructure for a business comes on top of consumption that is already there. If charging falls at the same time as your production peak, the peak at the meter shoots up. Asking your grid operator for more power is the classic reflex, but it has consequences:

• In Flanders, according to the Fluvius customer requests tariff sheet 2026, you are always connected to medium voltage above 250 kVA, with your own customer cabin. Between 25 and 250 kVA the grid operator decides. From 25 kVA Fluvius first carries out a paid detailed study, which you pay even if you do not accept the quote. In zones with expected grid congestion, Fluvius can offer a flexible connection such as Fall-Back Flex.
• In Wallonia, according to ORES, several zones already carry a high congestion risk. Access to power there is an issue for business customers asking for a new connection or an increase above 56 kVA. Above 250 kVA, a connection with flexible power can be offered. ORES itself advises to match the requested power to your real needs and to look at internal flexibility, including storage batteries.

What you can do when your request is refused or delayed is explained in our article on a heavier connection that is refused. A business battery is often the faster answer there, especially when the grid operator says no or asks for a cabin.

What does dynamic load management do?

Dynamic load management measures the consumption at the connection and gives the chargers only the power that is left under a set limit. When production runs at full speed, the cars charge more slowly. When consumption drops, they charge faster.

That works well when:

• the cars stand still for a long time (a night or a full working day);
• the energy needed per car is limited compared with the parking time;
• there are quiet hours when your building asks little.

It does not work when a car needs a lot of energy in a short time while your building also asks a lot. Load management can only lower the power, not add to it. That is exactly where a battery comes in.

When do you need a battery for EV chargers?

A battery for EV chargers supplies the difference between what the charging points ask and what your connection can deliver. It charges when there is room (in quiet hours or with solar power) and discharges during the peaks. Typical situations:

• a DC fast charger for visitors or vans that top up during the day;
• a fleet that arrives at the same time and has to leave again quickly;
• chargers on a site where the upgrade takes a long time.

The control sits in the system controller. In a Victron installation, the GX controller with the peak shaving function of Victron ESS watches the current at the energy meter. According to Victron, those limits apply to the whole system, so also to chargers connected in parallel. The battery steps in as long as its state of charge allows. With our monitoring you follow the system in real time.

A system with off-grid capability does more: when the grid fails, critical loads keep running. That sets a real system apart from a storage box that only shaves peaks. Take a look at our off-grid references for worked-out examples.

What do EV chargers do to your network costs?

It depends on your region and your connection. In Flanders the capacity tariff is based on your peak. The Flemish regulator defines the monthly peak as your highest quarter-hour of consumption in a month. A charger that starts uncontrolled during your production peak raises that monthly peak straight away.

How much that costs depends on your grid operator and connection. In the 2026 tariff list of Fluvius Antwerpen, a low-voltage customer with peak metering pays about 49.40 euro per kW of average monthly peak per year, excl. VAT. On the 1-26 kV grid you pay for access power and monthly peak, with an extra rate when you exceed your access power. How to calculate your own capacity tariff is explained in our article on the capacity tariff for businesses.

In Wallonia, the standard ORES tariff on low voltage up to 56 kVA has no capacity term (ORES tariffs 2026): there, the limit of your connection is the real constraint. Sites with ORES peak metering do pay a capacity term per kW, based for two thirds on the 11th highest quarter-hour of the month (ORES), so chargers that start together every morning still count. More on reading and lowering that peak is in our article on business peak demand.

How many chargers can a business with ten vans install without an upgrade?

The figures are illustrative and internally consistent, not a customer case.

A business has a low-voltage connection of 100 kVA. The measured quarter-hour values show a highest peak of 60 kW around 10:00, 40 kW on average during the day and 15 kW at night. It plans ten AC charging points of 11 kW for the vans and one DC fast charger of 50 kW for visitors. Added up on paper: 160 kW extra, so a request towards 250 kVA.

We set the safe limit on the existing connection at 85 kW.

The fleet at night. Each van drives about 80 km a day at 25 kWh per 100 km, so 20 kWh per van and 200 kWh for the fleet.

Dynamic load management is more than enough here. No battery and no upgrade are needed for the fleet.

The fast charger during the day. In the worst case a charging session falls at the same time as the 60 kW peak.

The business stays on its 100 kVA connection and the peak at the meter stays under 85 kW. Without control, the monthly peak could rise by 50 kW from the fast charger alone. At the Fluvius Antwerpen tariff that is about 2,470 euro per year (50 x 49.40 euro, excl. VAT). Because the inverter is above 25 kVA, a grid study for the battery does follow in Flanders. Running electric trucks too? They need far more power: read how to charge electric trucks at your depot on a small grid connection.

Which rules apply to charging points at your business?

In Flanders, according to the Flemish government, these obligations apply:

• Existing non-residential buildings with more than 20 parking spaces must have at least two charging points of normal or high power since 1 January 2025.
• New builds and major renovations with more than 10 parking spaces need at least two charging points and ducting for at least one in four parking spaces. This applies to applications from 11 March 2021.
• A charging point must deliver more than a normal socket (more than 3.7 kW or 16 A) and have a Type 2 plug (AC) or a Combo 2 plug (DC).
• Fines: 2,000 euro per missing charging point and 1,000 euro per parking space without the required ducting.

In Wallonia, the building energy performance rules ask existing non-residential buildings with more than 20 parking spaces to have one charging point and the connection infrastructure for one in five parking spaces from 1 January 2025 (Energie Wallonie). In Brussels, check the current rules with Brussels Environment.

For the battery: every storage system is declared to the grid operator. In Flanders you declare it to Fluvius, and above 25 kVA inverter power (three-phase) a grid study follows. In Wallonia, a battery is one of the installations to declare to ORES, with a more detailed study above 10 kVA. The installation must also be approved under the AREI (the Belgian electrical code) by an approved inspection body.

When is a heavier connection the right choice after all?

A battery cannot supply energy that is not there. If the shortfall lasts for hours every day, an upgrade is the honest answer. Security of supply is an engineering question, not a product purchase: the answer comes from your metering data.