Background
On April 28, 2025, a big power cut hit Spain and the Iberian Peninsula. It showed that the local energy storage system has major weaknesses, especially when using a lot of renewable energy. We saw the transportation stopped working—traffic lights went off, subways stopped running, and even the Madrid Open tennis tournament had to pause. This made it clear that strong energy storage system is important to make the grid more stable.
Two months later, Spain made a new law: Royal Decree Law 7/2025. This law is meant to speed up energy storage development. It makes it easier to get approval for energy storage projects, simpler to connect to the grid, and encourage renewable energy projects to bulid energy storage system. It also says energy storage system is a "public utility," which makes it easier to get land reourse and permission to bulid. Plus, energy storage system can join power markets and offer extra services. All these changes create good conditions for implementation of reliable, scalable storage solutions—and UE, a leading BESS manufacturer with 15 years production experience, has a wide range of products to meet these needs.
1. Low Voltage Lithium Batteries from United Energy
For residential, commercial, and small-scale scenarios: homes, offices, restaurants, shops, farms, etc.
Low-voltage BESS systems are engineered for decentralized energy independence, ideal for mitigating disruptions like the 2025 outage and reducing reliance on unstable grid supply.
Roller Lithium Battery
- Models: Ro3-LV-16.07
- Key Specs: 16.07kWh (51.2V, 314Ah); 8,000 cycles @80% DOD (0.5C); max charge 150A, discharge 200A; IP65 protection.
Advantage: Rugged design suits outdoor installations (e.g., farm sheds), while high discharge current ensures reliable backup for critical loads like refrigeration in restaurants
Wall-Mounted Lithium Battery
- Model: R4-LV-5.12; R4-LV-10.24
- Key Specs: 5.12kWh (51.2V, 100Ah), 10.24kWh (51.2V, 200Ah); 6,000 cycles @80% DOD (0.5C); max charge/discharge 100/100A, 200/200A.
- Advantage: Space-saving design fits seamlessly in houses or offices, providing instant backup during outages for lighting, computers, and communication devices.
Rack Lithium Battery
- Models: R1-LV-10.24 ; R1-LV-14.33
- Key Specs: 10.24kWh (51.2V, 200Ah), 14.33kWh (51.2V, 280Ah); 6,000 cycles @80% DOD (0.5C); max charge/discharge up to 200A.
- Advantage: Modular rack design allows easy expansion—ideal for shops or farms needing scalable storage to pair with rooftop solar, reducing reliance on the national grid.
2. High Voltage Lithium Batteries from United Energy
For medium-scale scenarios: small/medium factories, schools, tourist attractions, etc.
These systems address higher energy demands, aligning with Spain’s law to simplify grid access for storage, enabling seamless integration with on-site renewable generation.
Rack Lithium Battery (R5-HV-57.34~200.7)
- Capacity Range: 57kWh–200kWh (configurable via 14.4kWh modules: 4–14 modules, 204.8V–716.8V, 280Ah).
- Key Specs: 6,000 cycles @80% DOD (0.5C); max charge/discharge 200A.
- Advantage: Scalable to meet varying loads—e.g., powering a school’s classrooms and labs during peak hours or stabilizing energy for tourist attractions with fluctuating visitor numbers.
All-In-One Battery Cabinet (UESS-CAB 50-100F)
- Configuration: 50kW inverter (Deye/Solis/other) + 100kWh HV battery (358.4V, 280Ah); air-cooled; IP55.
- Advantage: Plug-and-play design accelerates deployment, complying with Spain’s simplified approval process. Perfect for small factories needing quick integration with solar panels.
All-In-One Battery Cabinet (UESS-CAB 50/100-200F)
- Configuration: 50kW/100kW inverter + 200kWh HV battery (716.8V, 280Ah); air-cooled; IP55.
- Advantage: Higher power output suits facilities with heavy machinery, such as food processing units, ensuring uninterrupted operation during grid fluctuations.
3. Pure BESS (Battery Energy Storage Systems) from United Energy
For large-scale scenarios: industrial complexes, hospitals, sports stadiums, etc.
These containerized systems deliver bulk storage capacity, directly addressing Spain’s need for grid stability amid high renewable penetration, while leveraging the law’s provisions for market participation and auxiliary services.
20GP BESS Container
- Core Components: 12×200kW PCS; 2500kVA transformer; high-voltage cabinet; power distribution room; local communication cabinet (data acquisition, UPS); 20GP prefabricated cabin with fire protection.
- Battery Compartment: 12×418kWh clusters (1331.2V, 314Ah); liquid cooling (40kW); fire suppression; lighting/ventilation.
- Total Capacity: 5,016kWh.
- Advantage: Compact footprint fits urban settings (e.g., hospital campuses), providing rapid frequency regulation and backup power during outages—critical for life-saving equipment.
40HQ BESS Container
- Core Components: 2×1250kW PCS (900–1350Vdc); 2500kVA transformer; high-voltage cabinet; power distribution room; local communication cabinet; 40HQ prefabricated cabin with fire protection.
- Battery Compartment: 14×358.4kWh clusters (1280V, 280Ah); 2×DC combiner cabinets (8-in-1-out); 2×40kW air conditioners; fire suppression; lighting/ventilation.
- Total Capacity: 5,017.6kWh.
- Advantage: Larger battery bank and optimized cooling suit high-demand facilities like football clubs (e.g., powering stadium lights, scoreboards, and broadcast systems) while participating in Spain’s energy market for revenue generation.
Conclusion:
UE’s various energy storage products are made to fit Spain’s priorities after power outages and Royal Decree Law 7/2025. From home backup power to stabilizing the big power grid, each product is long-lasting through many uses, easy to expand as needed, and follows local rules. This makes approvals easier, lets them connect to the grid, and creates ways to make money by joining the market.
By using these solutions together, Spanish businesses, communities, and industries can get better at dealing with power outages, lower energy costs, and help the country move to a stable power grid that mainly uses