Our Founders

Powering autonomy with resilience and reliability.

The Solarunion Founders

The California Solar Experts

Our commitment to quality is something that has been engrained in our company’s practices since the beginning. We are a full-service solar company who strives to make clean, renewable energy the norm throughout all of California.

If you are interested in learning more about our services, give our team of skilled specialists a call today at (888) 815-6633.

Renzo Castillo, Executive Director

Prior to founding FirstPV, Renzo worked in the real estate/project finance and investment banking industries for over five years as both a sell-side advisor and buy-side investor. While at Centerline Capital Group, a leading tax credits equity investor and syndicator, Renzo directed critical projects including the acquisition, structuring and asset management of $500mm developments in the affordable housing space. At Citigroup Alternative Assets, Renzo advised on transactions and provided leveraged financing to the largest private equity funds in the world. Renzo was also part of the mergers and acquisitions team at Credit Suisse, based in New York, where he managed the financial due diligence for and executed $1.7bn cross-border transactions.

Renzo graduated with honors from the University of California at Berkeley with a BS in Economics and received his MBA from The Wharton School at the University of Pennsylvania, where he was a Robert Toigo Fellow. Renzo holds dual nationality in Peru and the U.S. He lives in San Francisco, CA.

Ivan La Frinere-Sandoval, CEO

Ivan La Frinere-Sandoval has worked in the solar PV industry for over seven years in all segments of the value chain. While at Trina Solar, a leading vertically integrated solar module manufacturer, he led the $150mm project investment team, $400mm capital raise, $700mm procurement restructuring, $800mm Changzhou supplier co-location PV industry park, $4.4bn manufacturing capacity expansion, and $500mm polysilicon refining plant. At SolarCity, a leading residential and commercial solar developer, Ivan developed an internal project finance model in conjunction with an analysis of the commercial portfolio, including a comprehensive audit of a 1.1MW system and various residential systems. At Credit Suisse, Ivan completed capital raising and M&A transactions worth $8bn.

Ivan graduated from Caltech with a BS in Mechanical Engineering and Finance and received his MBA from Stanford University’s Graduate School of Business.

Why Choose SolarUnion?

  • We Treat Customers Like Family

    You can hold us accountable for decades. We will stand behind our work and do whatever it takes to remedy any issues you have.

  • Our Guarantee to You

    We offer a comprehensive Trifecta guarantee that covers for parts, labor and production for 25 years.

  • The Most Reliable Home Energy Provider

    We value delivering certainty when it comes to installing and maintaining clean, reliable solar energy.

  • We're Committed to Educating

    Solar is complicated and SolarUnion is here to educate homeowners not to push sales. We hire solar advocates, not sales reps.

  • We Respect the Roof

    We treat our customers' roofs like they are our own. An install will not be rushed if it means jeopardizing the integrity of the roof.

  • Making Solar Accessible to All

    Our goal is to help foster the adoption of renewable energy. No matter the type of roof or your credit, you can go solar.

  • Diamond Certified
  • Trina Solar
  • Panasonic Solar
  • LG
  • SunPower
  • Tigo Energy
  • SMA
  • Quick Mount
  • PACE

Our Customer Testimonials

    I have told all my friends and neighbors about the benefits of our solar installation!

    - Larry

    Unbelievable. Went from site inspection to system being fully operational in 5 weeks.

    They were very quick to follow thru at every step, and extremely responsive to every question.

    I had never been invited by a salesperson to stop the conversation right there, go out and compare.

    The optimized solar system is delivering incredible power and more than enough to zero out the electric bill and sell some to the grid.

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Turn to Our Team of Professionals

Schedule Your Consultation

Call (888) 815-6633 or fill out the form below.

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