Case study 02 · EV charging infrastructure · Truck fleet
Trucks that get paid to charge
An installer delivered a future-proof site at a transport company in West Flanders, with eleven electric trucks. The Voltmasters EMS plays negative energy prices to perfection: charging at the right moment brings in money.
The situation
Negative prices are not a problem, they're an opportunity
On sunny days with lots of renewable production, day-ahead prices dip below zero more and more often. Whoever takes power from the grid at that moment gets paid for it. But the window is short, and steering by hand is hopeless: batteries, solar panels and chargers all have to be controlled at once, to the second.
The EMS reads the market prices automatically and plans the whole site ahead, quarter-hour by quarter-hour.
Day-ahead energy prices
One day, price per MWh
13:45 −€200.83/MWh
In the highlighted window the price is negative: taking power from the grid brings in money.
How does it work?
The EMS flips the logic, in four steps
Batteries sell first
The BESS discharges in advance, freeing up room for cheap or negative power.
Charge from the grid at full power
During the negative price window the whole site, trucks and batteries, charges at full capacity.
PV temporarily limited
The solar panels are briefly capped: at that moment grid power pays better than own production.
One efficient ecosystem
The EMS steers all assets together and guards the 2,000 kVA grid connection.
Two snapshots from the platform
The full grid power goes to the batteries first, then to the chargers. The site's remaining consumption always stays covered.
13:40 · Batteries first
Main meter 439 kW
- Batteries
- 406.6 kW · charging
- Chargers
- 0 kW
- Solar panels
- 0 kW · limited
- Remaining consumption
- 32.4 kW
14:05 · Trucks at full power
Main meter 440 kW
- Batteries
- 0 kW
- Chargers
- 410.6 kW · charging
- Solar panels
- 0 kW · limited
- Remaining consumption
- 29.4 kW
Site specifications
A future-proof site, fully coordinated
Electric trucks
11× Mercedes-Benz eActros
Battery storage (BESS)
8× Poweroad BESS 105 kW / 215 kWh
Chargers
2× Siemens Sicharge D 400 kW (8 connectors)
PV installation
420 kWp of solar panels
Connection capacity
2,000 kVA · Telecontrol v5 Fluvius
EMS
Voltmasters, optimal steering of all assets
Voltmasters result
The trucks don't just get charged, they even get paid for it.
Smart steering, storage and charging infrastructure brought together in one efficient ecosystem.
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