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© 2026 EcoVoltec

Engineering Design Consultancy

Engineeringthe Futureof Energy.

Solar, BESS, substations and datacentre power — designed to NEC 2023, NFPA, UL, IEEE and IEC, and built to pass inspection the first time.

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PV array

Solar PV Design

DC/AC layouts, string sizing, yield and grid connection for utility-scale PV.

Solar PV design

Inverter

Electrical Primary Design

Inverter and PCS integration, equipment sizing, cable schedules and earthing.

Primary design

Battery energy storage

BESS Design

Cell-to-container design, PCS, protection, controls and NFPA 855 / UL 9540 layouts.

BESS design

MV/HV transformer

Substation & MV Infrastructure

Step-up transformers, MV switchgear and collector systems — designed as one package.

Substation design

Substation busbar

Substation Design

Primary and secondary substation design up to 275kV, protection & control included.

Substation design

Grid connection

Power System Studies

Load flow, short circuit, protection coordination and grid-code compliance studies.

Power system studies

Datacentre load

Datacentre Power

Utility intake, MV distribution and on-site generation for high-availability loads.

MV / HV infrastructure
Indicative single-line diagram · illustrative values · select a node
300MW+
Generation & Storage Delivered
220kV
Top Design Voltage
20+
Projects Delivered Worldwide
100%
Client Retention Rate
Designed to
  • NEC 2023
  • NFPA 855
  • UL 9540
  • IEEE
  • IEC

Reference Designs

One package. Every system that carries power.

Grid-scale storage and datacentre power are the hardest versions of the problem we solve every day — utility intake, MV switchgear, standby generation, cooling plant and on-site renewables, all coordinated into a single buildable package.

Isometric reference design of a grid-scale battery energy storage facility: rows of BESS containers with inverter and transformer skids, MV cable routes running to an adjacent air-insulated substation with power transformers and transmission takeoff, plus a control building and secured site access.
Grid-Scale BESS — Containers, PCS & SubstationIndicative scheme · not a specific client site

Marker 1

Battery containers

Battery enclosures arranged in blocks, with separation for fire spread and maintenance access.

What we design

  • DC block layout and spacing
  • DC cabling and combiners
  • Auxiliary supplies
  • Fire detection interfaces
  • NFPA 855
  • UL 9540 / 9540A
  • NEC 706
  • IEC 62933

Marker 2

PCS / inverter skids

Power conversion systems turning battery DC into grid-synchronised AC.

What we design

  • PCS sizing and DC/AC interface
  • Protection settings
  • Control and comms wiring
  • UL 1741
  • IEEE 1547
  • NEC 705
  • IEC 62477

Marker 3

MV skid transformers

Step-up transformers and ring main units feeding the MV collector system.

What we design

  • Transformer sizing
  • MV switchgear
  • Earthing and terminations
  • IEEE C57
  • IEC 60076
  • NEC 450

Marker 4

MV cable routes

Buried collector circuits linking the skids to the substation.

What we design

  • Cable sizing and ampacity
  • Routing and crossings
  • Sheath bonding
  • Pulling calculations
  • NEC 311
  • IEC 60287
  • IEEE 575

Marker 5

HV substation

Air-insulated switchyard connecting the plant to the transmission network.

What we design

  • Primary and secondary design
  • Protection and control
  • SCADA
  • Earth grid and lightning protection
  • IEEE 80
  • IEEE 998
  • IEC 61850
  • IEC 61936

Marker 6

Grid transformer

Main power transformer stepping the collector voltage up to transmission level.

What we design

  • Rating and impedance
  • Transformer protection
  • Oil containment and clearances
  • IEEE C57.12
  • IEC 60076

Marker 7

Control building

Protection panels, SCADA, communications and auxiliary AC/DC supplies.

What we design

  • Panel layouts
  • LVAC and DC systems
  • SCADA / RTU architecture
  • Cable schedules
  • IEC 61850
  • NFPA 70
  • IEEE 1613
01Battery containers

Battery enclosures arranged in blocks, with separation for fire spread and maintenance access.

What we design

  • DC block layout and spacing
  • DC cabling and combiners
  • Auxiliary supplies
  • Fire detection interfaces
  • NFPA 855
  • UL 9540 / 9540A
  • NEC 706
  • IEC 62933
02PCS / inverter skids

Power conversion systems turning battery DC into grid-synchronised AC.

What we design

  • PCS sizing and DC/AC interface
  • Protection settings
  • Control and comms wiring
  • UL 1741
  • IEEE 1547
  • NEC 705
  • IEC 62477
03MV skid transformers

Step-up transformers and ring main units feeding the MV collector system.

What we design

  • Transformer sizing
  • MV switchgear
  • Earthing and terminations
  • IEEE C57
  • IEC 60076
  • NEC 450
04MV cable routes

Buried collector circuits linking the skids to the substation.

What we design

  • Cable sizing and ampacity
  • Routing and crossings
  • Sheath bonding
  • Pulling calculations
  • NEC 311
  • IEC 60287
  • IEEE 575
05HV substation

Air-insulated switchyard connecting the plant to the transmission network.

What we design

  • Primary and secondary design
  • Protection and control
  • SCADA
  • Earth grid and lightning protection
  • IEEE 80
  • IEEE 998
  • IEC 61850
  • IEC 61936
06Grid transformer

Main power transformer stepping the collector voltage up to transmission level.

What we design

  • Rating and impedance
  • Transformer protection
  • Oil containment and clearances
  • IEEE C57.12
  • IEC 60076
07Control building

Protection panels, SCADA, communications and auxiliary AC/DC supplies.

What we design

  • Panel layouts
  • LVAC and DC systems
  • SCADA / RTU architecture
  • Cable schedules
  • IEC 61850
  • NFPA 70
  • IEEE 1613
Power Supply
MV intake, substation, transformers
Distribution
LV switchboards, busway, UPS, PDU
Cooling
Chilled water and facility water plant
Data / Network
Containment, pathways, hall layout
Fire Protection
Detection, suppression, interlocks
On-site Supply
Solar PV and BESS integration
How We WorkDiscuss a Datacentre Project

Markets We Serve

Deep expertise across the energy sector.

BESS Design

Battery Energy Storage System design from grid-scale to utility projects — protection, controls, and integration.

Datacentre Projects

Electrical infrastructure design for high-availability datacentre facilities, from MV supply to LV distribution.

Solar Design

Small and large-scale solar PV system design, including utility-scale DC/AC design and grid connection studies.

Substation Design

Primary and secondary substation design up to 275kV, including protection & control, civil, and structural elements.

Electrical Infrastructure

Medium and high-voltage electrical infrastructure design for developers, EPCs, and system integrators.

Wind Energy

Electrical design services for onshore and offshore wind projects — collector systems, substations, and controls.

All ServicesView Portfolio

What We Do

Engineering services built for the energy transition.

End-to-end engineering design across the full spectrum of modern energy infrastructure — from the first line on a schematic to commissioning support on-site.

View All Services
  • Electrical Primary Design
  • Protection and Control Design
  • Substation Design (up to 275kV)
  • SCADA and Control Systems Design
  • Power Systems Engineering
  • Battery Energy Storage System Design
  • Solar PV System Design
  • Earthing and Grounding Design
  • Civils and Structural Design
  • Automation and Integration Services

Follow the Power

From first study to energisation.

One team carries the design from feasibility to commissioning — so the assumptions made on day one are still true on the day the plant is energised.

  1. Stage 01

    Feasibility

    Is the site worth the capital?

    Constraint mapping, layout options, an early single-line and an honest capacity or yield number — before anyone commits.

    • Layout options
    • Early SLD
    • Yield

  2. Stage 02

    Power system studies

    Set the design basis before drawing it.

    Load flow, short circuit, protection coordination and grid-code studies fix the ratings, settings and connection the utility will accept.

    • Load flow
    • Short circuit
    • Grid code

  3. Stage 03

    Primary design

    Every cable has a number.

    Single-line diagrams, equipment sizing, layouts, cable schedules, containment and earthing — coordinated across every discipline.

    • SLDs
    • Cable schedules
    • Earthing

  4. Stage 04

    Protection & control

    Clear faults. Keep the plant online.

    Protection philosophy and settings, schematics, SCADA and communications architecture for the whole site.

    • Relay settings
    • SCADA
    • IEC 61850

  5. Stage 05

    IFC drawings

    Issued for construction.

    A complete, revision-controlled package the AHJ, the utility and the contractor can all build from.

    • IFC package
    • RFI close-out

  6. Stage 06

    Commissioning support

    Still reachable on site.

    Construction RFIs, test and energisation support, and as-built updates once the plant is running.

    • Site RFIs
    • Energisation
    • As-builts

Key Projects

Proven at scale, globally.

From utility-scale storage in the US and Europe to island microgrids in the Caribbean. Select a location to see what we designed there.

Full Portfolio
Solar PVBESSSolar + BESSEV chargingWindStudies & R&D Head officeCity-level positions · numbers = projects in an area

South Carolina · Northeast US · 2 projects

  • Utility BESS site layout

    Greer, South Carolina · 136 MW

    BESS

    Preliminary site plan and KMZ layout for a utility-scale standalone battery, including the substation and transmission-line interface.

  • Commercial PV + BESS sizing study

    Northeast US · Commercial-scale

    Solar + BESS

Louisiana · 1 project

  • Standalone BESS site layout

    Louisiana · 135 MW

    BESS

    Site layout through three revisions for a utility-scale standalone battery.

Pennsylvania · New Jersey · New York · 4 projects

  • Manufacturer HQ rooftop solar (two buildings)

    Malvern, Pennsylvania · 203 kWdc + 28 kWdc

    Solar PV

  • Truck repair shop rooftop solar

    Birdsboro, Pennsylvania · 79.6 kWdc

    Solar PV

  • Carport and rooftop solar

    Ventnor City, New Jersey · 166 kWp

    Solar PV

  • Solar energization study

    Glen Spey, New York · Commercial PV

    Studies & R&D

California · 5 projects

  • Residential solar permit pack

    Glendora, California · 9.84 kWdc

    Solar PV

  • Residential solar permit plan

    Burbank, California · 4.1 kWp

    Solar PV

  • Residential solar permit pack

    Los Angeles County, California · 6.56 kW

    Solar PV

  • Residential solar + battery backup

    Los Angeles, California · Residential

    Solar + BESS

  • Container-roof solar permit pack (+ 6.4 kW residential design)

    Woodside, California · 2.4 kWp

    Solar PV

USA · 1 project

  • 3D solar module R&D (simulation + field validation)

    USA · 30% yield gain

    Studies & R&D

Alberta · 1 project

  • City solar + wind feasibility report

    Calgary, Alberta · Feasibility study

    Studies & R&D

The Bahamas · Turks & Caicos · Cayman Islands · 7 projects

  • Solar + BESS + generators microgrid

    The Bahamas · 20MW · 33kV

    Solar + BESSCase study
    Case study

  • Solar farm — complex terrain

    The Bahamas · 22MW · 33kV

    Solar PVCase study
    Case study

  • Utility solar + BESS

    New Providence, The Bahamas · 20 MW AC / 27 MW DC + BESS

    Solar + BESSDetail design

  • Six island sites

    The Bahamas · 7 MW PV · 4 MW / 8 MWh

    Solar + BESS60% design

  • Island microgrid

    The Bahamas · 1 MW PV · 2 MW / 4 MWh · 6 MW DG

    Solar + BESS90% design

  • BESS integration

    Turks & Caicos · 1.25 MW / 4 MWh

    BESSIFC / as-built

  • Protection coordination study

    Cayman Islands · Existing network

    Studies & R&DStudy

Saba · St. Lucia · 2 projects

  • Microgrid — tender design

    Saba, Dutch Caribbean · 2 MW PV · 2 MW / 4 MWh

    Solar + BESSTender design

  • Solar + BESS + substation

    St. Lucia · 13 MW PV · 18 MW / 31 MWh · 66kV

    Solar + BESSEPC bid

South America · 1 project

  • Grid-connected BESS

    South America · 12MW / 30MWh · 132kV

    BESSCase study
    Case study

Germany · Denmark · Europe · 9 projects

  • Utility BESS

    Germany · 110 MW / 220 MWh

    BESS

    Single-line diagram and layout at 20 kV with MV skid PCS, plus substation design (33 kV GIS, E-house). Also six standard portfolio design variants: 5.5, 11, 16.5, 22, 44 and 99 MW.

  • Utility BESS

    Berlin, Germany · 60 MW

    BESS

    Single-line diagram and site layout for an urban grid-connected battery.

  • 132 kV battery storage

    Germany · 10 MW / 25 MWh

    BESSCase study
    Case study

  • Battery storage plant

    Zeven, Lower Saxony, Germany · 2 MW / 4 MWh

    BESS

    Full design pack: SLD, layout, power and auxiliary cabling, earthing.

  • Containerised BESS

    Germany · 1 MW

    BESS

  • BESS MV network connection (20 kV)

    Germany · Commercial-scale

    BESS

  • Solar + BESS commercial analysis

    Bornholm, Denmark · Commercial-scale

    Solar + BESS

  • Utility solar farm yield study

    Europe · Utility-scale

    Solar PV

  • BESS substation tender design

    Europe · Utility-scale

    BESS

Sweden · 1 project

  • Wind farm electrical design

    Sweden · Utility-scale

    Wind

    Electrical design to Swedish standards (Elsäk-FS / EBR) and IEC.

Ireland · 5 projects

  • Hotel ground-mount solar

    Tralee, Co. Kerry, Ireland · 218.5 kWp

    Solar PV

  • Solar carport

    Killarney, Co. Kerry, Ireland · 44 kW

    Solar PV

  • Forecourt solar carport

    Ireland · Commercial carport

    Solar PV

  • EV charging station (design + proposal)

    Co. Kerry, Ireland · 50 kW

    EV charging

  • EV charger feasibility (ROI)

    Ireland · 50 kW

    EV charging

Sierra Leone · 1 project

  • Utility solar plant: yield, ROI and BOQ

    Sierra Leone · 50 MW

    Solar PV

    Yield simulation, ROI model and bill of quantities.

New South Wales · 3 projects

  • Retail store rooftop solar (tender design)

    Inverell, New South Wales · Commercial rooftop

    Solar PV

  • Shopping centre rooftop solar (tender design)

    Cooranbong, New South Wales · Commercial rooftop

    Solar PV

  • Residential battery storage

    New South Wales · Residential

    BESS

Thailand · 1 project

  • Solar + BESS system design

    Thailand · 22.2 kW

    Solar + BESS

UAE · 1 project

  • Off-grid solar + storage (early stage)

    United Arab Emirates · Off-grid

    Solar + BESS
USA
Greer, SC (136 MW BESS)
Louisiana (135 MW BESS)
Malvern, PA (rooftop solar, 203 kWdc + 28 kWdc)
Ventnor City, NJ (166 kWp solar carport)
Canada
Calgary, AB (solar + wind feasibility)
Caribbean
The Bahamas (20 MW solar + BESS microgrid)
St. Lucia (13 MW PV · 18 MW / 31 MWh)
South America
Grid-connected BESS (12 MW / 30 MWh, 132 kV)
Europe
Germany (BESS up to 110 MW / 220 MWh)
Ireland (solar carports, ground-mount, EV charging)
Africa
Sierra Leone (50 MW solar)
Australia
Inverell & Cooranbong, NSW (commercial rooftop solar)
Asia & Middle East
Thailand (solar + BESS)
UAE (off-grid solar + storage)
South Carolina · Northeast US2 projects

  • Utility BESS site layout

    Greer, South Carolina · 136 MW

    BESS

    Preliminary site plan and KMZ layout for a utility-scale standalone battery, including the substation and transmission-line interface.

  • Commercial PV + BESS sizing study

    Northeast US · Commercial-scale

    Solar + BESS
Louisiana1 project

  • Standalone BESS site layout

    Louisiana · 135 MW

    BESS

    Site layout through three revisions for a utility-scale standalone battery.

Pennsylvania · New Jersey · New York4 projects

  • Manufacturer HQ rooftop solar (two buildings)

    Malvern, Pennsylvania · 203 kWdc + 28 kWdc

    Solar PV

  • Truck repair shop rooftop solar

    Birdsboro, Pennsylvania · 79.6 kWdc

    Solar PV

  • Carport and rooftop solar

    Ventnor City, New Jersey · 166 kWp

    Solar PV

  • Solar energization study

    Glen Spey, New York · Commercial PV

    Studies & R&D
California5 projects

  • Residential solar permit pack

    Glendora, California · 9.84 kWdc

    Solar PV

  • Residential solar permit plan

    Burbank, California · 4.1 kWp

    Solar PV

  • Residential solar permit pack

    Los Angeles County, California · 6.56 kW

    Solar PV

  • Residential solar + battery backup

    Los Angeles, California · Residential

    Solar + BESS

  • Container-roof solar permit pack (+ 6.4 kW residential design)

    Woodside, California · 2.4 kWp

    Solar PV
USA1 project

  • 3D solar module R&D (simulation + field validation)

    USA · 30% yield gain

    Studies & R&D
Alberta1 project

  • City solar + wind feasibility report

    Calgary, Alberta · Feasibility study

    Studies & R&D
The Bahamas · Turks & Caicos · Cayman Islands7 projects

  • Solar + BESS + generators microgrid

    The Bahamas · 20MW · 33kV

    Solar + BESSCase study
    Case study

  • Solar farm — complex terrain

    The Bahamas · 22MW · 33kV

    Solar PVCase study
    Case study

  • Utility solar + BESS

    New Providence, The Bahamas · 20 MW AC / 27 MW DC + BESS

    Solar + BESSDetail design

  • Six island sites

    The Bahamas · 7 MW PV · 4 MW / 8 MWh

    Solar + BESS60% design

  • Island microgrid

    The Bahamas · 1 MW PV · 2 MW / 4 MWh · 6 MW DG

    Solar + BESS90% design

  • BESS integration

    Turks & Caicos · 1.25 MW / 4 MWh

    BESSIFC / as-built

  • Protection coordination study

    Cayman Islands · Existing network

    Studies & R&DStudy
Saba · St. Lucia2 projects

  • Microgrid — tender design

    Saba, Dutch Caribbean · 2 MW PV · 2 MW / 4 MWh

    Solar + BESSTender design

  • Solar + BESS + substation

    St. Lucia · 13 MW PV · 18 MW / 31 MWh · 66kV

    Solar + BESSEPC bid
South America1 project

  • Grid-connected BESS

    South America · 12MW / 30MWh · 132kV

    BESSCase study
    Case study
Germany · Denmark · Europe9 projects

  • Utility BESS

    Germany · 110 MW / 220 MWh

    BESS

    Single-line diagram and layout at 20 kV with MV skid PCS, plus substation design (33 kV GIS, E-house). Also six standard portfolio design variants: 5.5, 11, 16.5, 22, 44 and 99 MW.

  • Utility BESS

    Berlin, Germany · 60 MW

    BESS

    Single-line diagram and site layout for an urban grid-connected battery.

  • 132 kV battery storage

    Germany · 10 MW / 25 MWh

    BESSCase study
    Case study

  • Battery storage plant

    Zeven, Lower Saxony, Germany · 2 MW / 4 MWh

    BESS

    Full design pack: SLD, layout, power and auxiliary cabling, earthing.

  • Containerised BESS

    Germany · 1 MW

    BESS

  • BESS MV network connection (20 kV)

    Germany · Commercial-scale

    BESS

  • Solar + BESS commercial analysis

    Bornholm, Denmark · Commercial-scale

    Solar + BESS

  • Utility solar farm yield study

    Europe · Utility-scale

    Solar PV

  • BESS substation tender design

    Europe · Utility-scale

    BESS
Sweden1 project

  • Wind farm electrical design

    Sweden · Utility-scale

    Wind

    Electrical design to Swedish standards (Elsäk-FS / EBR) and IEC.

Ireland5 projects

  • Hotel ground-mount solar

    Tralee, Co. Kerry, Ireland · 218.5 kWp

    Solar PV

  • Solar carport

    Killarney, Co. Kerry, Ireland · 44 kW

    Solar PV

  • Forecourt solar carport

    Ireland · Commercial carport

    Solar PV

  • EV charging station (design + proposal)

    Co. Kerry, Ireland · 50 kW

    EV charging

  • EV charger feasibility (ROI)

    Ireland · 50 kW

    EV charging
Sierra Leone1 project

  • Utility solar plant: yield, ROI and BOQ

    Sierra Leone · 50 MW

    Solar PV

    Yield simulation, ROI model and bill of quantities.

New South Wales3 projects

  • Retail store rooftop solar (tender design)

    Inverell, New South Wales · Commercial rooftop

    Solar PV

  • Shopping centre rooftop solar (tender design)

    Cooranbong, New South Wales · Commercial rooftop

    Solar PV

  • Residential battery storage

    New South Wales · Residential

    BESS
Thailand1 project

  • Solar + BESS system design

    Thailand · 22.2 kW

    Solar + BESS
UAE1 project

  • Off-grid solar + storage (early stage)

    United Arab Emirates · Off-grid

    Solar + BESS

Featured Projects

Project visual to follow
BESSSite layoutSubstation interface

136 MW Utility BESS

Greer, South Carolina

Preliminary site plan and KMZ layout for a utility-scale standalone battery, including the substation and transmission-line interface.

Project visual to follow
BESSSite layout

135 MW Standalone BESS

Louisiana

Site layout through three revisions for a utility-scale standalone battery.

Project visual to follow
BESS20 kV33 kV GIS

110 MW / 220 MWh Utility BESS

Germany

SLD and layout at 20 kV with MV skid PCS, plus substation design (33 kV GIS, E-house) — and six standard portfolio variants from 5.5 to 99 MW.

Project visual to follow
BESSSLDSite layout

60 MW Utility BESS

Berlin, Germany

Single-line diagram and site layout for an urban grid-connected battery.

Project visual to follow
Solar PVYieldROI

50 MW Utility Solar

Sierra Leone

Yield simulation, ROI model and bill of quantities.

Project visual to follow
Solar PVBESSGrid Studies

27 MW Solar + BESS

New Providence, Bahamas

Utility solar plus storage — 20 MW AC / 27 MW DC — taken through detail design.

Project visual to follow
SolarBESSMicrogridSCADA

20 MW Microgrid

Bahamas — Island Sites

Solar PV, battery storage and diesel generation integrated into one island grid.

Case study
Project visual to follow
Solar PVCommercial

C&I Rooftop Solar

Malvern, Pennsylvania

Manufacturer headquarters rooftop solar across two buildings: 203 kWdc + 28 kWdc.

Engineering Tools

Free tools, built for engineers.

A growing suite of calculation tools covering cable sizing, earthing design, short-circuit analysis and more — all free, no login required.

All Tools

Try it: LV cable sizing

IEC 60364-5-52 · live result

Open full tool — IEC, BS 7671 & NEC

Why EcoVoltec

The difference that delivers results.

Deep Specialist Expertise

Our engineers have delivered over 300 MW of renewable projects worldwide, with unmatched depth in BESS and solar design.

Speed Without Compromise

Across the 20+ projects we have worked on worldwide, a structured design process gets construction-ready packages out quickly — without cutting corners.

Global Project Experience

From the US to the Caribbean and Europe — our team understands the nuances of international grid codes and standards.

Client Testimonials

What Our Clients Say

“It was a complicated project with 132kV substation, and the BESS System Design. EcoVoltec exceeded our expectations. Their work was visually appealing and highly professional, with an incredibly fast delivery time. Great results, and always open for revisions.”

Fabian Eckl

CTO, Flex Power Energy

Let's Work Together

Ready to power your next project?

Whether you have a project in development or need to rescue a delayed design, our team is ready to help you move faster.

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