SunWell Energy Installs a 1,254 kWh Liquid-Cooled Battery Storage System at a Polish Logistics Park
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Three 418 kWh battery cabinets work with rooftop solar to manage peak electricity demand.
SunWell Energy installed a 1,254 kWh (1.254 MWh) commercial battery energy storage system at an existing warehouse and logistics park in Poland. The project combines three 418 kWh liquid-cooled lithium iron phosphate (LFP) battery cabinets with a commercial power conversion system and an energy management system. Housed in a repurposed shipping container, the batteries are designed to store surplus rooftop solar generation and discharge when the site approaches its grid import limit.
Why the logistics park paired rooftop solar with battery storage
The park's existing electrical infrastructure had limited spare capacity. When loading equipment, refrigeration, lighting, and packing lines run at the same time, grid demand can rise sharply. The site had roof space for solar panels, but the timing of solar generation and warehouse activity did not always align.
During periods of strong sunlight, the rooftop array can generate more electricity than the warehouse needs. Later in the day, loading and packing operations can still be busy as solar output falls. Battery storage gives the site a way to carry some of that midday generation into the hours when it needs more power.
How the 1.254 MWh BESS system manages grid demand
The energy management system (EMS) uses readings from the grid meter, rooftop PV system, and site loads to schedule charging and discharging. Solar generation first serves the warehouse. When generation exceeds on-site demand, the surplus can charge the batteries. When grid import approaches the site's configured threshold, the EMS instructs the SunWell power conversion system (PCS) to discharge the batteries and supply part of the load.
The duration of a demand peak matters as much as its size. A brief overlap between several loads may call for a short burst of battery power. A longer period of simultaneous refrigeration and warehouse activity requires more stored energy. The 1,254 kWh figure describes the batteries' combined nominal capacity. The available PCS output and battery state of charge determine how much of a given peak the system can cover.
Where the site's electricity contract and connection terms allow it, the EMS can also schedule grid charging during lower-priced hours.
Why the batteries were installed in an outdoor container
Finding space inside an operating warehouse was a practical constraint. The project team installed the three battery cabinets in a repurposed shipping container on an existing paved area. The enclosure includes a service aisle, fire protection, ventilation and dehumidification provisions, and earthing. This layout keeps battery equipment and routine maintenance access outside the warehouse's loading and storage areas.
Project specifications
| Item | Project configuration |
|---|---|
| Location | Poland |
| Site | Existing warehouse and logistics park |
| Nominal storage capacity | 1,254 kWh (1.254 MWh) |
| Battery configuration | 3 × 418 kWh liquid-cooled LFP cabinets |
| Power conversion | SunWell commercial PCS |
| System architecture | Grid-connected battery storage with rooftop PV and EMS control |
| Installation | Outdoor container enclosure on a paved site |
| Primary applications | Solar self-consumption, peak shaving and maximum demand management |
How the park can measure the result
Two readings matter most for this installation: how much rooftop solar the site uses and how much power it draws from the grid during its busiest periods. Comparing solar self-consumption and maximum grid import across periods with similar operating conditions can show whether the batteries are shifting energy to the hours when the warehouse needs it. The financial impact can then be assessed against the site's actual electricity tariff and billing terms.