What are the steps and timeline of a business battery project?

A business battery project follows seven steps: measure, size, offer, paperwork, install, inspect and commission, monitor. Its timeline follows the slowest step: a grid study, a permit or a heavier connection sets the pace, not the battery. Planning a business battery? Start the paperwork with the design.

Maybe the capacity tariff keeps pushing your bill up, or new chargers are coming on a tight connection. You want the battery running before winter, but you hear anything from a day to half a year.

The clock does not start when you sign, and it does not stop when the battery is on the wall. Fluvius answers one thing by phone and another by letter a year later. A first inspection fails on one breaker, and the re-inspection costs time and money.

What are the business battery project steps and timeline?

A business battery project has seven steps, and three of them happen outside your site: the grid operator, the permit desk and the inspection body. The paperwork step is where most projects lose time.

Did you receive two or three quotes that do not compare? Then read our 12 questions for every battery supplier.

How long does it take to install a business battery?

There is no single number, but you can see in advance which steps take longest. On an existing connection with good data and no study or permit, the preparation is short. With a grid study or a permit, the official terms alone can add about five months.

Read the chart as a maximum per step, not as a sum. A battery on an existing connection often needs no permit, and a year of meter data removes the measuring month.

Our own first project shows the full route: a Zele entrepreneur asked the question in early 2018. By the end of 2018 the preliminary study, the execution, the test phase and the handover were done.

Equipment delivery and days on site depend on system size and brand; we publish no standard lead times. Ask for a planning with dates per step in your offer.

What data do you need before a business battery can be sized?

You need your consumption per quarter of an hour, ideally for a full year, plus your solar yield if you have panels. That shows your real peaks, and the peaks decide the battery power.

In Flanders, a digital meter records quarter-hour values that you download in Mijn Fluvius. Then step 1 takes a day, not a month. Without data, or on a changing site, the battery is sized on a guess unless you measure first.

A garden contractor in Zele was still building his house and warehouse, so nobody knew the future use. We measured average and peak consumption for one month, and only then matched the number of solar panels to the real use.

Sizing on real data also stops oversizing. On our off-grid project in Beernem, the battery was not oversized and the capacity can be expanded later. That is often cheaper than buying for a future that may never come. Our article on peak demand in a business explains how to read your peaks.

Do you need to notify Fluvius or ORES of a business battery?

Yes. In Flanders every storage system must be notified to Fluvius, and in Wallonia ORES also asks for a declaration. The size of the battery decides how heavy the procedure is.

In Flanders, a system with an inverter up to 25 kVA (three-phase) is notified in Mijn Fluvius, with the inspection report, so after installation. An approved inspection body must first declare it conform under the AREI (the Belgian electrical safety code).

Larger systems go through a grid study, before commissioning. The Flemish technical regulation gives Fluvius ten working days to check that your file is complete. Fluvius then has thirty working days to send an offer or a motivated refusal.

In Wallonia, ORES requires a paid detailed study for production installations above 10 kVA. Works are planned after payment and the signed connection contract, and a request for commissioning is required before any production starts. Ask ORES or RESA before you start how your battery is treated.

Do you need a permit for a business battery, and how long does it take?

Often not for the battery itself, but check it in the design step. In Flanders, battery systems are not in the VLAREM classification list, so they need no environmental permit of their own. General conditions still apply above 10 kWh.

A container outside, a new technical room or a change to the building may need a planning permit, and the fire service may give advice. In Flanders, the permit authority has up to 30 days to check the file. It then decides within 60 days (simplified procedure) or 105 to 120 days (regular).

In Wallonia a stationary battery above 10 kWh needs a declaration with the municipality, and the fire service must be informed before commissioning. In Brussels, batteries above 10 kWh need an environmental permit. If a permit is needed, file it in parallel with the grid operator step, never after it.

Our guide on whether a business battery is safe covers the fire rules, distances and permits in detail.

What happens at installation, AREI inspection and battery commissioning?

Installation is the visible part: battery, inverters, cabling and control go in and are connected to your installation. The commercial battery installation steps after that follow a strict order.

1. Step 1: Finish and test. The installer completes the installation and tests it.
2. Step 2: Inspection. An approved inspection body checks the installation. For non-household installations the AREI requires this conformity check before use, and again every five years.
3. Step 3: Notification. The battery is notified to the grid operator, or commissioned under the terms of the grid study.
4. Step 4: Go live. Settings are fine-tuned on real data, and alarms and monitoring are switched on.

A battery that has not run through a real day of peaks and solar has not really been tested. That is why our first project had its test phase before the handover. Ask which tests come before handover and whether you get a commissioning report.

That report also matters for your warranty, as our article on business battery warranty and maintenance explains.

What slows a business battery project down, and when is it not the fastest route?

Six things delay most projects, and all six are visible before you sign. Four are covered above: no consumption data, a grid study above 25 kVA, a full local grid and a permit or fire-service advice.

Is the cabin the question for you? Then read our comparison of a high-voltage cabin or a battery.

Need power on a site within weeks, or has your building no connection yet? Then a standard battery project is not the first step.

• A building site waiting for its connection: a mobile site battery bridges the gap. See what to do when your building-site connection comes too late, or look at our site battery.
• A new building without an affordable connection: the question is off-grid or semi off-grid. See off-grid for businesses.
• A site whose use will change a lot soon: measure first and size after the change, as in Zele.