Turnkey BESS EPC Contractor & Balance of System
Single-point engineering, procurement, construction, and grid synchronization for utility-scale and industrial containerized battery energy storage systems across India and the GCC.
- Cell Technology: 314Ah+ LFP Prismatic
- Thermal Loop: Direct Liquid Cooling (±2°C)
- PCS Technology: Grid-Forming (GFM) / GFL
- Round-Trip Efficiency: ≥ 86.5% System RTE
- Switchyard Scope: 33kV up to 400kV AIS/GIS
Eliminating Multi-Vendor Package Friction
Why multi-contracting energy storage projects creates severe commissioning delays, and how Ultrathon's turnkey EPC model provides total accountability.
DC Block & Inverter Interface Harmony
Mismatches between DC battery rack operating voltages (1000V–1500V DC) and PCS MPPT inverter tracking windows degrade energy throughput. Ultrathon tightly couples cell rack impedance with bi-directional 4-quadrant inverters, preventing DC clipping and harmonic generation.
Single-Point Performance & RTE Wrap
When battery OEM, PCS supplier, and BoP switchyard contractors are hired separately, performance finger-pointing is inevitable during capacity shortfall tests. Ultrathon assumes complete single-point liability for system round-trip efficiency, availability, and auxiliary consumption.
Turnkey Substation & Transmission Interconnect
Unlike pure-play battery packagers, Ultrathon possesses in-house high-voltage electrical BoP capabilities, constructing 33kV, 66kV, 132kV, 220kV, and 400kV pooling switchyards, step-up transformers, and overhead transmission lines with complete CEIG charging sign-offs.
The Six Pillars of Ultrathon’s Turnkey BESS EPC Delivery
Engineered and executed as a unified, bankable power infrastructure asset.
DC Battery Block & Containerized Enclosures
High-density 20ft and 40ft ISO containerized enclosures utilizing Tier-1 314Ah+ LFP prismatic cells. Enclosures feature IP55/NEMA 4X ingress rating, C5-M anti-corrosion marine coating, and integrated direct-to-plate liquid cooling circuits holding cell delta-T within ±2°C.
Power Conversion System (PCS) & MV Skid
Bi-directional central and string PCS inverters with sub-20ms full-power step response. Fully equipped with Grid-Forming (GFM) virtual synchronous generator algorithms, black-start capability, dynamic reactive power support (Q at night), and integrated 0.69kV/33kV oil-immersed step-up transformers.
Three-Tier BMS & Energy Management System (EMS)
Real-time cell monitoring (BMU), rack-level control (BCU), and container-level master aggregation (BAU). Coupled with industrial EMS and SCADA running automated market dispatch algorithms, TOD tariff optimization, state of charge (SoC) rebalancing, and IEC 60870-5-104 grid telemetry.
Multi-Tier Fire Suppression & NFPA 855 Safety
Early off-gas detection (CO, H2, VOCs) before smoke manifestation, calculated explosion deflagration relief panels, certified fire-rated barrier walls, and automated clean-agent aerosol plus dry-pipe water deluge systems tested to UL 9540A large-scale fire propagation standards.
High-Voltage Substation & Grid Interconnection
Turnkey 33kV pooling switchboards, 66kV/132kV/220kV/400kV AIS or GIS step-up substations, numerical protection relay panels, RTU telemetry to State Load Despatch Centres (SLDC), and full statutory Chief Electrical Inspector (CEIG) safety certifications.
Civil Infrastructure, Foundations & HVAC Balance
Geotechnical soil testing, reinforced concrete equipment plinths engineered for seismic and wind load criteria, transformer oil containment pits, perimeter security fencing, lightning protection grids, and auxiliary power distribution with backup diesel generators.
Ultrathon's 5-Stage BESS EPC Execution Methodology
Precision project management ensuring on-time commercial operation (COD) with zero safety incidents.
Plan & Survey
Geotechnical soil borings, grid interconnection feasibility, load flow and short-circuit studies in ETAP, and preliminary single-line architecture.
Detailed Engineering
3D BIM container layouts, cable routing schedules, relay coordination curves, liquid cooling pipework CFD analysis, and statutory CEIG submission drawings.
Procure & FAT Audit
Procurement of Tier-1 cells, containers, and PCS. Rigorous Factory Acceptance Testing (FAT) witnessing at manufacturing plants before shipment.
Construction & BoP
Civil plinth casting, container crane placement, MV cable laying, termination, step-up transformer installation, and switchyard bay construction.
Commission & COD
Site Acceptance Testing (SAT), round-trip efficiency test, sub-20ms frequency response validation, CEIG charging, and commercial COD handover.
Performance Guarantees & Compliance Standards
Backing turnkey execution with bankable contractual performance metrics and global safety certifications.
Contractually guaranteed AC-to-AC round-trip efficiency measured at the high-voltage point of interconnection, factoring in all auxiliary cooling losses.
High-availability architecture with redundant liquid cooling chillers, modular PCS power stacks, and hot-swappable communication modules.
Certified container enclosures designed to prevent cell-to-cell and container-to-container thermal runaway propagation under worst-case testing conditions.
Full compliance with Central Electricity Authority grid connectivity regulations, IEEE 2800 inverter-based resource standards, and SEC transmission codes.
Need Independent PMC Instead?
Already have an EPC contractor selected and require independent Owner’s Engineer advisory to review design submittals and audit FAT/SAT milestones? Explore our BESS PMC services.
Frequently Asked EPC Questions
What is included in Ultrathon’s turnkey BESS EPC scope? ↓
What performance guarantees does Ultrathon provide as a BESS EPC contractor? ↓
How does Ultrathon handle high-ambient cooling for utility BESS in 45°C+ summer heat? ↓
Can Ultrathon provide EPC services for integrated Solar + BESS hybrid plants? ↓
Execute Your BESS Project with Ultrathon
Contact our turnkey EPC practice group for technical evaluation, Single Line Diagrams, and bankable project delivery.