Electrical and Solar Contractors trust SepiSolar


SepiSolar supports solar professionals with design and engineering services ranging from complete plan sets for overflow work to rush requests to meet critical deadlines.

Our clients look to us for:



  • Design & Engineering support for overflow work
  • Complex project support
  • Project management support
  • Rush work to meet critical deadlines

With over 11.5 GW and 23,500 engineered solar designs since 2009 SepiSolar’s process is engineered to succeed by providing predictable, reliable work on a contracted schedule so that you can rest assured that the project is on time and on budget.

Request a free estimate for your solar project(s) today.



Are you an Electrical Contractor or Professional Solar Organization?

If yes, please complete this form to get your free solar project quote.


Using SepiSolar for designing and engineering Swell Energy’s solar-plus-storage systems was a no-brainer. Storage is complicated, so we wanted to work with a team of U.S.-based quality engineers who could speak ‘fluent storage’ and get out accurate plan sets quickly and with minimal AHJ revisions.”

Andrew Meyer,
Co-Founder, Swell Energy


The price of failure with defects on a finished project is severe, and it’s simply not worth trying to save a few dollars upfront only to be bitten down the road with failures. That’s why we partner with SepiSolar for all of our engineering and design needs for solar and storage.”

Ben Lochtenberg,
CEO of Xero Solar


Using SepiSolar for designing and engineering Swell Energy’s solar-plus-storage systems was a no-brainer. Storage is complicated, so we wanted to work with a team of U.S.-based quality engineers who could speak ‘fluent storage’ and get out accurate plan sets quickly and with minimal AHJ revisions.”

Andrew Meyer,
Co-Founder, Swell Energy


Sunlight Electric has been working with SepiSolar since 2012, and they’re our trusted partner for quality solar engineering work. Their engineering team is current on code, best practices, and their work product is well-received by AHJs.”

Rob Erlichman,
Founder of Sunlight Electric


SepiSolar has been providing us with commercial solar engineering services for the last three years, producing our construction drawings and providing us with useful insight to difficult questions that we run into. We are more than happy with the results, as well as with the relationship that we have with them and will not only continue to use them, but would recommend them to anyone.”

Eric Virkler, P.E.,
Director of Commercial Solar, Earthlight Technologies


We submitted our RFP proposal to the utility today, and I wanted to thank SepiSolar for the excellent service you provided. Your ability to provide a detailed engineering design on a tight turnaround time was impressive. Your input helped us secure an updated solar design that met all of the RFP’s requirements. We look forward to working with SepiSolar again on future projects.”

Travis Stowers,
Power System Application Engineer, Doosan GridTech


Using SepiSolar for designing and engineering Swell Energy’s solar-plus-storage systems was a no-brainer. Storage is complicated, so we wanted to work with a team of U.S.-based quality engineers who could speak ‘fluent storage’ and get out accurate plan sets quickly and with minimal AHJ revisions.”

Andrew Meyer,
Co-Founder, Swell Energy


The price of failure with defects on a finished project is severe, and it’s simply not worth trying to save a few dollars upfront only to be bitten down the road with failures. That’s why we partner with SepiSolar for all of our engineering and design needs for solar and storage.”

Ben Lochtenberg,
CEO of Xero Solar


Using SepiSolar for designing and engineering Swell Energy’s solar-plus-storage systems was a no-brainer. Storage is complicated, so we wanted to work with a team of U.S.-based quality engineers who could speak ‘fluent storage’ and get out accurate plan sets quickly and with minimal AHJ revisions.”

Andrew Meyer,
Co-Founder, Swell Energy


Sunlight Electric has been working with SepiSolar since 2012, and they’re our trusted partner for quality solar engineering work. Their engineering team is current on code, best practices, and their work product is well-received by AHJs.”

Rob Erlichman,
Founder of Sunlight Electric


SepiSolar has been providing us with commercial solar engineering services for the last three years, producing our construction drawings and providing us with useful insight to difficult questions that we run into. We are more than happy with the results, as well as with the relationship that we have with them and will not only continue to use them, but would recommend them to anyone.”

Eric Virkler, P.E.,
Director of Commercial Solar, Earthlight Technologies


We submitted our RFP proposal to the utility today, and I wanted to thank SepiSolar for the excellent service you provided. Your ability to provide a detailed engineering design on a tight turnaround time was impressive. Your input helped us secure an updated solar design that met all of the RFP’s requirements. We look forward to working with SepiSolar again on future projects.”

Travis Stowers,
Power System Application Engineer, Doosan GridTech
















Why Solar Professionals Use SepiSolar

Our Process. Your Success: Our process is engineered to succeed by providing predictable, reliable work on a contracted schedule so that you can rest assured that the project is on time and on budget.

Support for Solar Organizations: We provide critical expertise in areas where most solar organizations have limited experience, resources, and time.

Project Expertise: Each of our departments are organized based on the project life cycle. You have a specialist whether you need development, planning, execution, or asset management support.



Growth Made Possible


We fill the gaps that most solar organizations have within their internal teams, allowing them to take on more work while building out those business units.


Specialized Expertise


We provide the expertise to keep your organization focused on what it does best, day in and day out.


We Emphasize the Process


We bring predictable results to our clients through tightly managed operations that keep their projects on schedule and on budget.

Pricing and Turnaround Time


  • How much are your commercial, utility, and microgrid design packages?
How much are your commercial, utility, and microgrid design packages?

Commercial and Industrial (C&I), utility, and  microgrid designs are more complex than residential systems, especially when energy storage is added. For the most accurate estimate of your large-scale solar design costs, request a free quote through our SepiPortal. 


  • What’s “Not-To-Exceed” pricing?
What’s “Not-To-Exceed” pricing?

When SepiSolar gives you a solar or storage design estimate, we base our quote on a “Not-to-Exceed” (NTE) pricing structure. That means that we charge you for the hours we estimate to complete the original scope of work multiplied by hourly rate of our engineer or the actual hours spent, whichever is less. The NTE amount will only be exceeded if the original scope of work and project details change.


  • What’s your turnaround time?
What’s your turnaround time?

SepiSolar’s delivers most residential designs in 3-5 business days, and commercial plans in 7-10 business days, depending on design complexity. For high-volume clients, SepiSolar assigns a dedicated engineer that can generate multiple designs in less than a day. A one-time expedite fee can also be applied to any project if turnaround is needed by a certain deadline.

Register to the SepiPortal for a fast, free estimate for one project or for high volume monthly pricing.


  • How much are your (qualified) residential design packages?
How much are your (qualified) residential design packages?

As with solar installation costs, our price for residential design and engineering services depends on the size, complexity, and volume of work. “Complexity” can include additional battery designs, EV-charging, elevation views, wind turbines, diesel generator-set integration and transfer switch controls, and structural and electrical professional engineer (PE) stamps.

For the most accurate estimate of your solar design costs, request a free design quote through our SepiPortal. 


Types of Projects


  • What size projects can you design?
What size projects can you design?

SepiSolar is your one-stop shop for all solar and energy storage design and engineering; we specialize in commercial/industrial, utility scale or large-scale residential.



  • Do you design solar+energy storage?
Do you design solar+energy storage?

Yes. SepiSolar has a wide range of energy storage design services for residential, commercial, and utility-scale projects. In addition to our design work, we also offer technical and financial energy storage modeling.


  • Can SepiSolar design solar and battery systems for any state?
Can SepiSolar design solar and battery systems for any state?

Yes. SepiSolar designs from California, but our NABCEP-certified engineers design solar-plus-storage systems for all 50 states and jurisdictions, as well as international projects and opportunities.


  • Are your permit plans customized for each jurisdiction?
Are your permit plans customized for each jurisdiction?

We continuously update our proprietary database of permitting requirements, allowing us to design solar and storage permit plans for each jurisdiction and utility across the U.S.


  • How many designs has SepiSolar completed?
How many designs has SepiSolar completed?

Since 2009, SepiSolar has designed over 6.5 GW of solar projects. That includes over 4,000 residential, more than 2,000 C&I, and agriculture projects, over 50 commercial and utility storage projects, and above the 200 mark for residential solar+storage projects. Obviously, these numbers grow every day.


About SepiSolar, Inc.


SepiSolar is a solar design & engineering firm and consulting company committed to creating abundant energy that is accessible to all, supplied by nature, and enabled by design. Since 2009, our licensed professional solar engineers and designers have advanced the development of commercial and industrial energy infrastructure. We provide complete plans sets, and all related engineering designs and drawings required to pass permitting with your local AHJs. Contact our solar design & engineering company today for your solar design and engineering service needs.



CA Small Business Enterprise

Certification ID:
2015743

Bidder/Supplier ID:
BID0068933

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:
065817064
CAGE:
8F5K7

UNSPSC Code:
811024, 81101701, 81101516, 81101604, 43232614, 81101505




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