Enphase Energy
Principal Mechanical Engineer
TLDR
Drive the mechanical design and system integration of innovative Battery Energy Storage Systems (BESS) to support a sustainable energy future while leading cross-functional teams in a fast-paced R&D环境
Enphase Energy is a global energy technology company and leading provider of solar, battery, and electric vehicle charging products. Founded in 2006, Enphase transformed the solar industry with our revolutionary microinverter technology, which turns sunlight into a safe, reliable, resilient, and scalable source of energy to power our lives. Today, the Enphase Energy System helps people make, use, save, and sell their own power. Enphase is also one of the fastest growing and innovative clean energy companies in the world, with approximately 80 million products installed across more than 160 countries.
We are building teams that are designing, developing, and manufacturing next-generation energy technologies and our work environment is fast-paced, fun and full of exciting new projects.
If you are passionate about advancing a more sustainable future, this is the perfect time to join Enphase. This role is part of the core Engineering R&D group focused on launching Commercial and Industrial storage products. Our team designs, prototypes, and scales industry‑leading storage systems that integrate Enphase’s core technologies—such as IQ series microinverters, combiners, and more—to deliver best‑in‑class, end‑to‑end energy solutions for our customers.
Must be available to work on-site at our Bangalore office 5 days per week.
About the role
As a Principal Mechanical Engineer, you will be responsible for the end‑to‑end mechanical architecture, detailed design, and system integration of commercial and utility‑scale Battery Energy Storage Systems (BESS). This includes cabinets, racks, and containerized platforms using sheet‑metal and welded structures, cast and machined components, polymers and elastomers for insulation and sealing, and durable coatings and finishes for long‑term outdoor operation.
You will integrate mechanical systems with battery modules, high‑power electrical assemblies (PCBs, contactors, protection devices), busbars, and cable harnesses, ensuring safe electrical clearances, thermal performance, manufacturability, and serviceability. You will also integrate forced‑air, HVAC, and liquid‑cooling solutions, working closely with electrical, compliance, and manufacturing teams. Through structured problem‑solving across new product development and field issues, you will drive improvements in reliability, safety, serviceability, and cost.
What you will do:
Ability to independently lead mechanical design projects or guide small teams, delivering against schedule, cost, quality, and performance targets.
Extensive experience executing 3D and 2D CAD (SolidWorks, EPDM), maintaining release‑ready design documentation, and leading mechanical and cross‑functional design reviews.
Strong understanding of structural and thermal design for heavy‑duty outdoor cabinets and containerized systems, including fans, HVAC, and liquid‑cooling solutions, and effective ECAD/MCAD integration.
Demonstrated experience planning and executing prototype builds, proof‑of‑concepts, and Design Verification Testing (DVT), including rapid design iteration.
Capability to define and execute comprehensive mechanical test plans (in‑house and external labs) covering static/dynamic loads, fatigue, environmental exposure, UL/IEC certification, and reliability requirements.
Who You Are and What You Will Bring:
15+ years (BE/B. Tech) or 12+ years (Master’s) of hands‑on experience in mechanical product design, development, and testing, with mandatory experience designing Commercial and Utility‑scale Battery Energy Storage Systems (BESS).
Bachelor’s degree or higher in Mechanical Engineering.
Proven ability to own end‑to‑end mechanical system design and delivery for BESS cabinets, racks, and containerized platforms, including sheet‑metal and welded structures, cast and machined parts, polymers and elastomers, and durable outdoor coatings.
Strong hands‑on experience designing, integrating, and validating electromechanical systems, including battery modules, high‑power electrical components (PCBs, contactors, fuses, breakers), busbars and cable harnesses, with focus on safety‑critical design, electrical clearances, manufacturability, and long‑term serviceability.
Hands‑on experience performing DFMEA, failure analysis (FA), and root‑cause analysis (RCA) using 8D and why‑why methodologies and driving corrective and preventive design actions.
Strong background in DFA / DFM / DFX for injection molding, sheet‑metal fabrication, stamping, milling, and turning, with continuous focus on cost, quality, and manufacturability.
Experience optimizing battery module and cell layouts within racks and containers for size, weight, installation, transportation, and long‑term serviceability.
Working knowledge of global standards and compliance applicable to commercial and utility BESS, including:
UL 9540, UL 9540A, UL 1741, UL 1973, IEC 62933
NEC 706, NFPA 70, NFPA 855, 68 & 69, and relevant IFC and IEC standards
Enclosure standards: IEC 60529 (IP), NEMA, IEEE 693 / AC 156
Material and Enclosure Safety: UL 94, UL 746C, UL50 / UL 50E
Connector standards: UL 486A‑486B, UL 6703, IEC 61984, IEC 61238‑1, EN 60512, EN 60352
Reliability testing: MIL‑STD‑810 environmental and mechanical methods
Experience supporting battery system certification, regulatory documentation, supplier engagement, and collaboration with AHJs.
Design experience for outdoor BESS enclosures with IP/NEMA ratings, C4/C5 corrosion protection, and durability targets exceeding 15 years.
Clear, concise, and effective written and verbal communication skills for global, cross‑functional collaboration, including manufacturing and suppliers.
Enphase Energy builds advanced solar and battery systems that provide customers with clean and accessible energy solutions. Targeting homeowners and businesses looking to harness renewable energy, Enphase's unique microinverter technology enhances the safety, reliability, and scalability of solar power systems. Their platform empowers users to generate, consume, and even sell their own energy, making a significant impact on the clean energy landscape.
Mechanical Engineer