Senior Microgrid Field Commissioning Engineer

This is a senior; hands-on field engineering role focused on the electrical power hardware side of microgrid deployment. You will lead commissioning of paralleling switch gear, protection relays, metering, battery systems, power supplies, and control panels across a variety of sites and system configurations. You will work closely with the Principal Controls Engineer (who owns controls software architecture and integration) and the Senior Applications Engineer (who owns design and electrical studies), but your focus is the site/plant: cable/hardware/configuration/integrated testing.

You may need to pull/terminate cables, verify terminating cables, verifying protection schemes, energizing equipment, and troubleshooting systems holistically when things don't work as designed.

The ideal candidate has a strong technician and field engineering foundation, understands electrical power systems from first principles, and is comfortable working on energized 480

VAC, 125

VDC, and 1500

VDC equipment. You think in terms of whole systems - not just the component in front of you - and you bring the discipline and safety culture needed for hot work, LOTO, and substation operations.

Box Power's engineering culture integrates AI tools throughout our workflow for documentation, troubleshooting reference, and analysis. You should be comfortable using AI tools to accelerate field documentation and reporting work.

Key Responsibilities

Commissioning and Startup

• Lead commissioning of microgrid systems including paralleling switch gear, automatic transfer switches, generator controls, inverters, DERs, BESS, and solar PV.
• Serve as the on-site technical lead during commissioning, coordinating with remote controls engineers, EPC contractors, and utility interconnection personnel.
• Perform pre-energization checks, insulation resistance testing, point-to-point wiring verification, relay functional testing, and protective device trip testing.
• Energize 480
  
  VAC, 125
  
  VDC, and 1500
  
  VDC systems, including station battery banks, DC distribution panels, battery chargers, solar PV string combiner boxes, and BESS DC circuits.
• Execute hot work, live switching, and breaker racking operations following strict safety protocols.
• Perform LOTO procedures and maintain arc flash safety compliance across all field activities.
• Commission medium-voltage (MV) equipment when project scope requires.

Hardware Integration and Installation

• Integrate protection relays (SEL-751, SEL-700G, SEL-735, or equivalent), power meters, cts/pts, and control devices into switch gear and control panel assemblies.
• Review design, test, and modify control panels including layout of power supplies, terminal blocks, DIN-rail components, relays, and wire management.
• Specify and integrate DC power supply systems, battery chargers, and 125
  
  VDC station battery configurations.
• Design and review paralleling switch gear configurations, including bus protection, synchrocheck, and generator paralleling schemes.
• Install and terminate fiber optic cabling (single-mode and multi-mode), Cat5e/6a Ethernet cabling, and serial shielded twisted pair (RS-232/RS-485) for Modbus RTU, CAN, and relay communications.
• Configure managed Ethernet switches for substation and microgrid networks.

Documentation and Engineering Feedback

• Develop and redline as-built wiring diagrams, single-lines, three-lines, and interconnection drawings.
• Document all field findings, punch list items, commissioning results, and lessons learned.
• Provide hardware design input to the engineering team based on field experience.
• Support the development of standardized commissioning procedures, test scripts, and factory acceptance test (FAT) protocols.

Troubleshooting and Diagnostics

• Troubleshoot complex system-level issues that span electrical, mechanical, controls, and communications domains.
• Diagnose protection relay misoperations, communications failures, power quality issues, and control system integration problems in the field.

Team and Cross-Functional

• Mentor junior field technicians and commissioning support staff as the team grows.
• Support estimating and proposals with hardware-specific technical input, BOMs, and labor estimates.
• Coordinate with the…