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CrestWatt

Electrical design and studies for solar, storage and connection projects.

Design and study work is scoped and quoted at a fixed price, from single line diagrams and cable schedules to earthing assessment, protection grading and grid compliance studies.

Standards and methods cited

  • BS 7671
  • IEC 60287
  • ENA TS 41-24
  • BS EN 50522
  • ENA EREC G99
  • ENA EREC P28
Electrical design engineer working on single line diagrams and cable schedules.

Scope

  • Electrical design: single line diagrams, cable sizing to BS 7671 and IEC 60287, cable routing, transformer station layout, LV and HV distribution
  • PV electrical design: string configuration, combiner box allocation, DC cable schedules, inverter and transformer station allocation, DC losses
  • Earthing design and assessment to ENA TS 41-24 and BS EN 50522, including brownfield sites with existing buried earthing systems and soil resistivity survey
  • Protection studies, grading and settings
  • Grid studies: load flow, fault level, G99 compliance, harmonic assessment, reactive capability
  • Connection application support and DNO technical liaison
  • Power plant controller specification: G99 and P28 compliance, frequency response modes, aggregator interface requirements
  • Design review and owner’s engineer support
  • Techno-commercial proposals and delivery frameworks for EPC subcontract scopes

Recent scope

  • 480 MW solar development in three phases: PV and electrical design as framework subcontractor to a European EPC
  • 57 MW battery storage site on a former DNO compound: earthing design assessment around a live existing buried earthing system

Engineering and Grid Studies — common questions

What design and study work does CrestWatt take on?

Single line diagrams and cable sizing to BS 7671 and IEC 60287, PV electrical design including string configuration and DC cable schedules, earthing design to ENA TS 41-24 and BS EN 50522, protection studies and settings, and grid studies covering load flow, fault level, G99 compliance, harmonics and reactive capability.

How is design work priced?

Design and study work is scoped and quoted at a fixed price, with a stated delivery date.

Can CrestWatt assess earthing on a brownfield site?

Yes. Earthing design and assessment includes brownfield sites with existing buried earthing systems and soil resistivity survey — for example a 57 MW battery storage site on a former DNO compound, assessed around a live existing buried earthing system.

Terms used on this page

Full glossary →

Next step

Send the scope of the study or design package. A fixed price and a delivery date will follow.

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