How do you get more power without a grid upgrade?

If a new pump, motor or machine needs more power than your connection gives, you have four routes. The grid operator can give you a heavier connection or a medium-voltage cabin. A soft starter or frequency drive tames the motor start. A generator or a battery with inverters supplies the extra amps on top of your connection. When only the start is the problem, a frequency drive may be enough. When the running power itself is too high, a semi-off-grid system keeps the connection you have and avoids the cabin.

You bought a new irrigation pump, a bigger compressor or an extra machine. The first time it starts, the main breaker trips. Or it runs on a quiet morning but trips when the rest of the site is busy. So you start switching one machine off before you start the other. Then the grid operator's answer comes back: a heavier connection with a long wait, or medium voltage with a cabin of your own.

There are ways to get more power without a grid upgrade, but first you need to know which problem you have. There may be two, with two different fixes. A motor that starts straight on the supply draws 6 to 8 times its normal (rated) current for a moment. That can happen even when the running power would fit. And the obvious fix is expensive. A medium-voltage cabin costs €40,000 to €75,000 on average (Inagro), and a heavier connection can come with a long wait. Meanwhile the new machine stands idle, or you plan your work around it.

A plant nursery in Jabbeke was in exactly that spot. Its 3x400 V connection of 32 A was fine until a new irrigation pump arrived. The proposal that came back was medium voltage, at a high price. YouPower installed a semi-off-grid system of 45 kVA with 92.4 kWh of batteries instead. The street connection stayed as it was and now only charges the batteries. The system delivers 63 A for the pumps, and frequency drives on the heaviest pumps make them run smoothly.

Why does a new pump or machine trip your connection?

Your connection is limited by the main fuse or breaker at the meter. A 3x400 V connection of 32 A delivers about 22 kVA (400 V x 32 A x 1.73). Everything that runs at the same time shares that limit: the pumps you already have, lighting, cooling, the workshop, the office. Add a new machine and two different things can go wrong.

The running power is too high

Say the new machine draws 15 kW and the rest of the site already uses 15 kW. That total is well above what a 22 kVA connection can carry. The fuse or breaker does its job and cuts the supply. No trick with the motor start changes that: you need more power, from the grid or from somewhere else. The same applies when a gas boiler makes way for a heat pump: see whether your business connection can handle a heat pump.

The start-up peak is too high (inrush current)

An electric motor that is switched straight onto the supply (a direct-on-line start) draws a peak current while it gets up to speed. For the common three-phase induction motor, this starting current (inrush current) is typically 6 to 7 times the rated current. It can reach 8 times, and efficient IE3 motors can go higher. A pump rated at 30 A can therefore ask for well over 150 A for a moment.

Fuses and breakers tolerate a short overload. That is why a pump sometimes starts fine on a quiet morning and trips the connection when the rest of the site is busy. The voltage also dips during the start, which other machines and electronics on the site notice.

Why farms and SMEs run into this more often now

Farms and SMEs grow one machine at a time. Think of an irrigation pump, a bigger manure pump, a milking robot, extra barn ventilation or a processing line. Each step looks small, but the connection was sized for the old site. When the jump is large enough, the answer is a heavier connection or a switch to medium voltage. Moving to another building? Then check the grid connection of the business building before you sign.

Even that answer is no longer certain. In March 2026 fruit growers in Bierbeek asked Fluvius to upgrade their power cabin from 250 to 400 kVA. Fluvius replied that their file was in a zone sensitive to congestion and gave no offer yet (VILT). By April 2026, 760 companies in Flanders were on the waiting list for grid capacity (PAL). Is grid congestion your main problem? Then our article on what to do when a heavier connection is refused or delayed walks through the Fluvius procedure and flexible connections.

What are your options when your connection is too small for a new machine?

The grid operator's route splits in two (a heavier low-voltage connection or a cabin), which gives five options side by side. They combine well: many sites put a frequency drive on the heaviest motor and add one of the other routes for the running power.

An honest note: a battery is not the answer for a machine that runs flat out 24 hours a day. Every kWh the battery delivers has to come back in from the connection, solar panels or a generator. If the load above your connection lasts all day, every day, a heavier connection or a cabin is the right call.

Also count the running cost. In Flanders the capacity tariff charges the average of your monthly quarter-hour peaks, at about €53.39 per kW per year excluding VAT in 2026. A heavier connection that you really use raises that bill too. A battery that covers the peak keeps the peak at the meter where it is. See how the capacity tariff is calculated for businesses.

What does a frequency drive on a pump do, and what not?

A frequency drive (variable frequency drive, VFD, or in Flemish "frequentiesturing") feeds the motor with a voltage and frequency it can vary. At start-up it ramps the motor up gently, so the current stays close to the rated current instead of jumping to several times it. A soft starter does something similar, for the start only. For pumps a drive has a second benefit: the pump can run at the speed the irrigation needs instead of always at full speed.

What a drive cannot do is make a pump that needs 15 kW at full flow draw much less than 15 kW. If the running total is above your connection, you still need more power. That is why YouPower combined both in Jabbeke: frequency drives on the heaviest pumps, and a battery system for the extra amps.

How can a battery add amps on top of a 32 A connection?

Think of the battery system as a second supply next to the grid. The grid connection keeps doing what it can, up to 32 A. It charges the batteries whenever the site uses less than that, for example at night. When the pump runs, the inverters take energy from the batteries and deliver the current the connection cannot. In Jabbeke the result is a 63 A supply from a 32 A connection.

Two numbers decide whether it works:

• Power (kVA): how much the inverters can deliver at once, including the start of the heaviest motor. Jabbeke: a system rated at 45 kVA. For comparison, 63 A three-phase at 400 V is about 44 kVA.
• Energy (kWh): how long the batteries keep it up before the grid has to refill them. Jabbeke: 92.4 kWh.

In YouPower's semi-off-grid setup, an automatic transfer switch changes between the public grid and the off-grid system at high speed. The site also keeps working during a grid outage. The system is built for SMEs and farms with a standard 3x400 V + N connection. For SMEs and farms that produce their own solar power, consumption from the grid falls by 75% on average. A weak connection can also cause the opposite problem: your solar inverter switches off because the grid voltage runs too high. Our article on why a solar inverter trips on high grid voltage shows how a semi-off-grid system solves that too.

Where did a battery avoid a heavier connection in Belgium?

Jabbeke plant nursery: the irrigation pump

Starting point: 3x400 V, 32 A. Trigger: a new irrigation pump that needed a heavier connection. Proposal on the table: medium voltage, at a high price. Solution: a semi-off-grid system of 45 kVA with 92.4 kWh of batteries. The street connection is kept and only used as a charger for a heavier 63 A supply that can drive the pumps. Frequency drives on the heaviest pumps make them run smoothly. See the Jabbeke plant nursery reference.

With a YouPower semi-off-grid system we were able to keep the street connection.

Wielsbeke flax processing: one heavy machine

Running this company on the public grid would have needed a large medium-voltage cabin. Instead, a generator starts the flax processing machine and keeps running while it works, as is also common at a concrete plant. The generator is loaded a little extra to charge a battery system of 3 x 8 kVA and 30.8 kWh. That battery covers the electricity for the rest of the day. See the Wielsbeke flax processing reference.

Farms and other sites: growth without medium voltage

• Londerzeel: at this dairy farm, not building a medium-voltage cabin saved at least €60,000 on day one, with no heavy cables across the property. Solar panels, a wind turbine and batteries grow along with the farm.
• Lokeren: the dairy farm grew fast and Fluvius could not supply that growth without a switch to medium voltage. The solar, wind and battery system pays back within 4 years because no medium voltage was needed.
• Tielt: 45 kVA and 123.2 kWh. The battery system provides the higher power, so no reinforcement was needed. The farm expects to take only 5% of its annual consumption from the grid.
• Wingene: 3x400 V 63 A from the battery alone. With solar panels or a wind turbine on top, no medium voltage is required.

Want to see what such an installation looks like? Watch the YouPower semi-off-grid installation video.

How do you size a battery for a new pump or machine?

You do not need to be an engineer to prepare the sizing. Four questions decide it:

• How much does the new machine draw when it runs, and how does it start? Look at the nameplate (kW and A) and whether it starts directly or through a drive.
• What does the rest of the site draw at the same time? The quarter-hour data from your digital meter show it.
• How long does the load stay above your connection? A few minutes, a few hours in the morning, or all day?
• When can the batteries refill? At night, at weekends, or at sunny middays if you have solar panels.

The example below is illustrative, not a customer case. The figures are chosen to show the method.

The result: inverters sized for the full pump load plus margin, and a battery with more than 30 kWh of usable capacity. Keep a reserve for dry spells when the pump runs longer, for outages and for battery ageing. Without the frequency drive, the inverters would also have to cover a start peak of several times the pump's rated current.

Sizing on the nameplate total tends to oversize the system; sizing on measured data does not. That is why a pre-study comes first. For larger sites the same logic scales up to commercial battery systems of up to 1 MW.

What does more power cost, and how long does it take?

Only confirmed figures here. The rest depends on your site, and we will not guess it for you.

• Medium-voltage cabin: €40,000 to €75,000 on average, depending on transformer power and cable length (Inagro). A cabin of your own also brings inspections and maintenance; our article on a high-voltage cabin or a battery covers what that involves.
• What avoiding it saves in practice: at the Londerzeel dairy farm, not building a cabin saved at least €60,000 immediately.
• Heavier low-voltage connection: priced by the grid operator after a study. Fluvius mentions long waiting times and extra costs for grid extension in saturated low-voltage areas.
• Battery system: sized on your profile, so we price it after the measurement. Ask us for a calculation.
• Payback: at the Lokeren dairy farm the system paid back within 4 years because no medium voltage was needed. Where no cabin is avoided, an off-grid system usually pays back within 6 to 8 years.

The comparison that matters: cabin money buys a bigger connection, and you still pay for every kWh and every kW of peak. Battery money buys power, storage and back-up during outages, and with solar panels it lowers the energy bill every day.

What steps do you take before adding a pump or machine?

1. Step 1: Collect the data of the new machine: rated power (kW), rated current (A), start method, and running hours per day and per season.
2. Step 2: Download a year of quarter-hour data from your digital meter (in Flanders via Mijn Fluvius), or have the site measured.
3. Step 3: Ask the grid operator in parallel what a heavier connection costs and how long it takes, so you compare real numbers. The procedure is explained in our article on connection upgrades under grid congestion.
4. Step 4: Check whether a frequency drive or soft starter alone keeps the start under the limit of your connection.
5. Step 5: If the running power is the problem, have a semi-off-grid system sized: inverter power, battery energy and recharge window.
6. Step 6: Compare the options over ten years: investment, waiting time, capacity tariff, outages, and what happens when the site grows again.

What happens when you contact YouPower?

You send the nameplate of the new machine, your connection size and, if you have it, a year of quarter-hour data. In the pre-study we work out the battery capacity you need. We also check whether frequency drives on the heaviest motors are part of the answer. We do not oversize: the system follows your profile, and the battery capacity can be extended later if the site grows again. Put that next to the grid operator's offer from step 3, and you compare real numbers.