Large-Scale Residential Solar Design & Engineering

SepiSolar is your reliable solar design and engineering partner. Whether you’re a high volume residential operation or just starting in the solar business, SepiSolar provides fast, accurate solar-plus-storage designs that get quickly approved.


SepiSolar’s experienced U.S team of electrical and structural engineers speed up permitting and interconnection approvals by knowing the specific codes and requirements of your jurisdiction and utility. As a result, your permits get approved quickly, eliminating costly delays and increasing your client’s trust and satisfaction.

Solar Design Package Icon

Complete Permit-Ready Solar Design Package

SepiSolar’s complete solar design packages include any customization needed for approvals from your specific local authority having jurisdiction (AHJs) and utility. Our permit-ready plan sets typically include:

  • Project Description
  • Governing Codes
  • Site Plan
  • PV Layout
  • Mounting & Racking Methods
  • Three-Line Electrical Diagram
  • Electrical Calculations
  • Parts List
  • Required Safety Placards
  • Elevation views
  • Other requirements as specified by your AHJ

SepiSolar designs systems for all types of residential applications and equipment, including:

  • Composite shingle, tile, Spanish tile, metal roofs, and various other roofing materials
  • Ground mounts
  • Solar canopies
  • Residential solar trackers
  • Batteries (on-grid self-consumption, off-grid back-up, or bi-modal/micro-grid with generator)
  • Direct-burial, cable tray, wire harnesses
  • DC-DC converters, optimizers, micro-inverters


Solar Energy Proposal

Solar Design & Energy Storage Proposals

Outsource your residential sales proposals. Using Aurora, HelioScope, PVsyst, PVWatts, among many others, SepiSolar quickly generates branded sales proposals and returns them to your sales team in minutes.

Sales proposals typically include:

  • Roof panel layout
  • Utility information
  • Shading analysis
  • Performance estimates
  • Estimated bill of materials (BOM)
  • Savings, ROI, payback, and cash flow


Solar Permit with PE Stamp

P.E. Stamps for all 50 States

SepiSolar provides electrical and structural Professional Engineering (P.E.) stamps for all 50 states. Some states require P.E. stamps for solar projects and some contractors add P.E. stamps as an extra level of quality. Construction plans with P.E. stamps give customers added assurance that their solar and storage projects have been safely designed and engineered to the codes and standards of your state and jurisdiction.

  • Electrical P.E. Stamps (wet or digital)
  • Structural P.E. Stamps (wet or digital)


SepiSolar has been a trusted and reliable solar design partner for the last 5 years. We rely on their industry knowledge, professionalism, quality of deliverables, and competitive pricing. They are more than a design/engineering provider; they are an industry resource in PV and energy storage.”

Michael V. Garcia,
V.P. of Product Development & Procurement,
PetersenDean Roofing and Solar

Solar Energy Storage Design

Residential Solar Design PDF

Request your large-scale residential solar design quote today.


Prefer to discuss your residential solar project with a specialist first?


CA Small Business Enterprise

Certification ID:

Bidder/Supplier ID:

NAICS Codes:
541330 – Engineering services
541340 – Drafting services
541490 – Other specialized design services
541618 – Other management consulting services
541690 – Other scientific and technical consulting services
541990 – All other professional, scientific, and technical services

D-U-N-S number:

811024, 81101701, 81101516, 81101604, 43232614, 81101505

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