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Why Detra Solar    Our Process   Case study

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Bridging the gap between design depth and owner-side technical oversight.

Detra Solar delivers integrated Battery Energy Storage System (BESS) Design and Owner’s Engineering services for utility-scale projects. We ensure your assets are technically robust, economically optimized, and independently verified from early development through construction.

Why choose Detra Solar as your partner

  • Proven utility-scale PV & BESS experience
  • Engineering-driven design approach
  • End-to-end project continuity
  • ISO 9001:2015 certified delivery
  • Global engineering expertise

The Problems We Solve

Many BESS projects stall, underperform, or face avoidable cost escalation for predictable reasons:

Wide Compact Problem Cards

Problem: Late optimisation

Layouts and BoP are optimised too late, locking in unnecessary losses and CAPEX overruns.

Problem: OEM-Driven Designs

OEM-driven designs prioritize vendor convenience, not project economics or long-term performance.

Problem: Disconnected Design

Owner’s Engineering is disconnected from detailed design, creating caps, rework, and unmanaged risk.

What is our Process

How We Support BESS Projects

Core Detra Solar Services

  • BESS site layout optimization
  • Electrical BoP design (MV and LV cable routing, trenching, trench sections)
  • Cable sizing and calculations
  • Single Line Diagrams
  • Civil layout coordination (earthworks design, foundation design and calculations, access, drainage)
  • Design documentations

Extended OE Services

  • Technology selection & vendor due diligence (BESS, PCS, EMS)
  • Review and challenge of OEM designs and guarantees
  • Technical inputs to RFPs and EPC contracts
  • Construction-phase technical supervision
  • FAT/SAT support and commissioning oversight
  • Independent performance and compliance verification
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Deliverables

Feasibility & Development Design & Procurement Contracting & Financial Close Construction Oversight & Commissioning & Handover Operations Support
Design
Service
  • CAD Engineering & Drafting Services
  • Concept / Preliminary Design Package
  • 3D Visualisations
  • Preliminary Electrical Design Engineering (SLDs) & Preliminary Calculations
  • Preliminary Bill of Quantities (BoQ / BoM)
  • Dedicated Design Engineering Support for Developers / IPPs / EPCs
  • Design Package for Permitting
  • Design Optimisations
  • 3D Visualisations for Public Consultation
  • Electrical Design Engineering (SLDs) & Calculations
  • Equipment Details Design Package
  • Bill of Quantities (BoQ / BoM)
  • Dedicated Design Engineering Support for Developers / IPPs / EPCs
  • Design Package for RFQ for Suppliers and Contractors
  • Full Turn-Key Detailed Design (Mechanical, Electrical, Civil, SCADA)
  • Electrical Design Engineering (SLDs) & Calculations
  • Detailed Equipment Details Design Package
  • Bill of Quantities (BoQ / BoM)
  • Technical Design Support to Project Management
  • Dedicated Design Engineering Support for Developers / IPPs / EPCs
  • Construction-Ready Drawings (Mechanical, Electrical, Civil, SCADA)
  • Electrical Design Engineering (SLDs) & Calculations
  • Detailed Equipment Details Design Package
  • Bill of Quantities (BoQ / BoM)
  • Technical Specifications & Descriptions / Reports
  • Final As-Built Drawings
  • Project Design Engineering Support during Construction
  • Dedicated Design Engineering Support for Developers / IPPs / EPCs
  • Review of Existing Designs
  • Technology Replacement Analysis
  • System Re-Design
  • Re-issue of As-Built Documentation
Technical Advisory
(Owner’s Engineering)
  • Feasibility & Site Assessment Reports
  • Design Review & Compliance Reports
  • CapEx & OpEx Validation
  • Project Management and Oversight
  • Value Engineering Recommendations
  • Technical Requirements & Specification Creation / Review
  • Procurement Evaluation Reports
  • Risk Register & Mitigation Plans
  • Project Management and Oversight
  • Technical Due Diligence
  • Technical Advisory Memos
  • Risk Register & Mitigation Plans
  • Project Management and Oversight
  • Progress & Oversight Reports
  • On-site Quality Control
  • Commissioning & Performance Test Reports
  • Quality Inspection Reports & NCR Register
  • Final Handover & As-Built Verification Package
  • O&M Plan Review & Validation
  • Spare Parts & Warranty Review
  • Early Operation Performance Review
  • Post-construction Risk Closure Report

How a 100 MWp Solar Park was built on Design Excellence

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Detra Solar is a solar engineering company that offers a comprehensive range of services in Solar & Storage, specializing in design and engineering.


Detra Solar, UAB

Company no: 304451669

VAT no: LT100010810319

Legal Address: Lvivo g. 21-101, LT-09309 Vilnius

Contacts

Email: sales@detrasolar.com