Field HV Technician – Mobile Battery Storage (Equity)

Critical Loop, Inc.; City of Long Beach (NY); On-site; USD 60,000 - 90,000; Full time

Benefits offered by this job

Stock options

Health coverage (HRA)

Retirement plan

Unlimited PTO

Job summary

Critical Loop, Inc. is seeking a Site Operations Technician to oversee the deployed battery fleet at customer sites. You will perform preventive maintenance, handle high-voltage safety, and ensure equipment stays in spec for the life of the contract.

You will collaborate with engineers, service technicians, and HQ staff to keep assets safe, reliable, and ready for commissioning, testing, and handover, with a focus on documentation and field reliability.

Qualifications

• 5+ years hands-on as a technician working with high voltage electrical systems.
• Competence on energized and de-energized high-voltage DC systems, including isolation, LOTO, and zero-energy verification.
• Practical understanding of Li-ion packs: BMS behavior, cell balancing, thermal management, safe handling of damaged or faulted modules.
• Reads from electrical schematics, wiring diagrams, and manufacturer service procedures without hand-holding.
• Documentation discipline; service records must stand up to warranty, customer, and safety audits.
• Valid driver's license with clean record; able to tow and position trailer-mounted equipment, lift 50 lb, and work outdoors in all weather.

Responsibilities

• Perform preventive maintenance on mobile BESS units: battery racks and modules, PCS/inverters, HVAC and thermal loops, DC and AC switchgear, auxiliary power, enclosures, and trailer systems.
• Execute corrective repairs from engineer-issued work orders and your own field diagnosis: module and component swaps, connector and busbar inspection, contactor and fuse replacement, coolant service, harness repair.
• Perform high-voltage isolation, lockout/tagout, and zero-energy verification on battery and PCS systems per NFPA 70E and company HV procedures, with stop-work authority on any safety concern.
• Set up, connect, and demobilize mobile units at customer sites, including interconnection to customer or utility switchgear under engineer or utility direction.
• Support commissioning and site acceptance testing: wiring verification, insulation resistance and continuity testing, torque verification, functional checks, and data capture.
• Isolate faults with diagnostic tools (multimeters, insulation testers, thermal cameras, CAN/Modbus interfaces, manufacturer service software) and capture the evidence engineering needs for root cause.
• Keep complete service records in the CMMS, manage depot spares and tooling, and train junior and contract technicians as the team grows.

Skills

High voltage systems

Lockout/Tagout

Li-ion packs

Electrical schematics

Documentation

Tools

CMMS

Insulation testers

Thermal cameras

Job description

Critical Loop, Inc. is seeking a Site Operations Technician to oversee the deployed battery fleet at customer sites. You will perform preventive maintenance, handle high-voltage safety, and ensure equipment stays in spec for the life of the contract.

You will collaborate with engineers, service technicians, and HQ staff to keep assets safe, reliable, and ready for commissioning, testing, and handover, with a focus on documentation and field reliability.