Applications
What a battery storage system is for on a site
Six uses, the same equipment. Sizing is based on the power drawn at peak and on how long that peak lasts.
A typical site
The battery covers the peak instead of the grid
When the site's consumption exceeds a threshold, the battery discharges to cover the excess. The meter sees only smoothed consumption.
Peak billing rules vary by country and by supplier.
The midday surplus serves the evening
The electricity generated by the solar installation in the middle of the day is stored, then released at the moment the site consumes.
The Mercury 261 accepts photovoltaic oversizing of 2 to 1, with an integrated transfer switch. CESC manufacturer data.
Charger bas, restituer haut
The on-board control system decides on prices and on the site's load curve. It charges when electricity is cheap and discharges when it is expensive, with no intervention.
The Mercury 418 carries predictive management compatible with aggregation. CESC manufacturer data. Market access depends on the country, the supplier and the aggregator.
The site runs without the grid
In the event of an outage, the site switches over and runs on the battery. The changeover and the back-up power are defined at configuration.
Grid-connected and off-grid operation. CESC manufacturer data.
The charger draws its power from the battery
A DC charger demands instantaneous power that the grid connection cannot always supply. The battery absorbs the demand, and the grid sees only smoothed consumption.
This is what links the two ranges Stellabox sells.
Schematic illustration over one day. It represents no customer site, carries no figures and is not a promise of results.
Schematic illustration of peak shaving. It represents no customer site and is not a promise of results.
Shave power peaks
An industrial site is billed on the highest peak measured during the month. Starting machines or a chiller is enough to push it up. The battery covers the excess instead of the grid.
Peak billing rules vary by country and supplier: the calculation is done case by case, at quotation stage.
Consume your own generation
Electricity generated in the middle of the day by a photovoltaic system is used in the evening, instead of being exported to the grid.
The Mercury 261 accepts photovoltaic oversizing of 2 to 1, with an integrated transfer switch. CESC manufacturer data.
Arbitrage the price of electricity
Charge when electricity is cheap, discharge when it is expensive. The on-board control system decides, based on prices and on your load curve, with no intervention.
The Mercury 418 carries predictive management compatible with aggregation. CESC manufacturer data. Access to markets and flexibility mechanisms depends on the country, the supplier and the aggregator: it is verified at quotation stage.
Run without the grid
The Mercury units operate grid-connected or off-grid. Changeover and back-up power are defined at configuration.
Grid-connected and off-grid operation. CESC manufacturer data.
Charge fast without upgrading the connection
A fast charger draws power that a site’s grid connection cannot always supply. The battery acts as a buffer between the grid and the charger.
This is what links the two ranges Stellabox sells.
Support a solar farm
On a new or an existing plant, storage smooths generation, shifts export and holds the power committed to the grid operator.
The Mercury 261 and 418 combine up to 5.22 MWh and 8.36 MWh across twenty units. CESC manufacturer data.
The control system is inside the cabinet
Each Mercury is an all-in-one system: cells, conversion, cooling and control in the same cabinet. It is this control system that arbitrages, shaves and switches over, and it is what makes dispatch by an aggregator possible.
The Mercury 418 carries predictive management compatible with aggregation. CESC manufacturer data. Available functions and their implementation are specified in the quote.
The EMS, the markets and what conditions every euroDo you recognise your site?
Eight situations that lead to storage
These are not references. They are the situations in which a battery becomes the cheapest answer, before equipment is even discussed.
Production workshop
Machines that start together at the beginning of a shift, and a contracted power set on those few minutes rather than on the day.
Peak shaving
Warehouse and logistics
A large roof, consumption that follows the docks, and forklifts to recharge at night when the site is empty.
Self-consumption and time shifting
Refrigeration and food processing
Chillers that never stop, and a grid outage that costs the stock before it costs the production.
Back-up and peak shaving
Vehicle fleet
Chargers to install, and a grid connection that cannot follow the power they draw together.
Supporting fast charging
Offices and shopping centres
Air conditioning that makes the summer peak, a car park to equip, and a bill where the capacity share weighs as much as the energy.
Peak shaving and charging
Hotels and multi-occupancy housing
Consumption peaks morning and evening, a reputation to uphold on continuity of service, and residents charging their vehicles.
Time shifting and back-up
Off-grid or temporary site
A grid connection that is absent, insufficient or temporary, and a generator running to cover rare peaks.
Off-grid operation
Farming operation
Solar generation that arrives at midday, consumption that happens early and late, and buildings far from the substation.
Self-consumption
Sizing is based on two figures: the power drawn at peak and how long that peak lasts.
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