SepiSolar

Expanding Engineering Capabilities

Website

About the firm

SepiSolar is a Menlo Park-based renewable energy engineering practice specializing in solar PV, energy storage, and solar microgrid design for residential, commercial, industrial, and utility-scale projects across all 50 states. It provides end-to-end project lifecycle support from feasibility and development through engineering design, permitting, and asset management, and also offers expert witness services in solar construction disputes. With more than 23,500 projects completed across 47 states and 11.5 GW of installed capacity, SepiSolar is a highly experienced third-party solar engineering group.

Team
Small
Firm type
Electrical Engineering · Forensic Engineering · Power & Utility Engineering

People

Josh WeinerFounder & CEO

Capabilities

Solar Engineering Design

Service website

Full engineering design and permitting packages for solar PV systems across residential, commercial, industrial, and utility-scale markets. This includes electrical single-line and three-line diagrams, structural calculations, and PE-stamped plan sets.

  • Residential Solar Design
  • Commercial & Industrial Solar Design
  • Utility-Scale Solar Design
  • Electrical single-line and three-line diagrams
  • Electrical and structural PE stamps (all 50 states)
  • Utility and AHJ permit processing

Energy Storage Engineering

Service website

Design, sizing, modeling, and permitting for battery storage systems. Support includes stand-alone energy storage, solar-plus-storage, DC- and AC-coupled configurations, and financial modeling for incentive programs.

  • Battery storage system sizing and performance modeling
  • Solar PV-plus-storage system sizing optimization
  • Stand-alone energy storage design (peak shaving, backup, UPS, emergency)
  • DC- and AC-coupled energy storage system design
  • Storage O&M and battery augmentation schedules
  • Energy Storage Financial Modeling
  • California SGIP and SOMAH application processing
  • Load analysis and degradation analysis

Solar Microgrid Design

Service website

Design and engineering of grid-tied or off-grid solar microgrids, integrating solar PV, energy storage, and supplemental generation sources such as wind, diesel, natural gas, and propane.

  • Grid-tied microgrid design
  • Off-grid microgrid design
  • Multi-supporting detail generation integration (solar, wind, diesel, gas)

Project Development Services

Service website

Third-party development management covering revenue analysis, site evaluation, feasibility studies, and utility interconnection to evaluate and advance energy infrastructure opportunities.

  • Revenue analysis and financial feasibility
  • Site evaluation
  • Utility interconnection support
  • Regulatory approvals and permitting strategy

Solar Product Services

Service website

Product development support for solar and storage hardware manufacturers, covering market research, sales and distribution studies, system design, prototyping, and pilot builds.

  • Market Research & Analysis
  • Component research and selection
  • Supplier due diligence
  • System design and manufacturing support
  • Sales & Distribution Study

Asset Management

Service website

Ongoing engineering support for operating solar and energy storage assets, including operations and maintenance guidance and performance monitoring support.

Solar Expert Witness Services

Service website

Expert witness testimony, case review, and technical analysis for solar construction litigation and arbitration, covering array design, engineering standards, and delay analysis.

  • Case review and technical analysis
  • Expert report preparation
  • Arbitration and litigation testimony
  • Delay analysis

Industries

Commercial · Residential · Industrial · Power Generation · Government · Education · Healthcare · Defense · Hospitality · Mining · Oil & Gas · Agriculture · Solar · Energy Storage · Renewable Energy · Data Centers

Projects

No projects listed yet.