Solar Letters launches with mission to automate PE stamps for residential installers

Solar Letters

There are currently many costly inefficiencies within the solar letter and PE stamp process in the residential solar industry, with most firms still performing calculations manually or using Word or Excel documents. All of these methods have been tested and proven to be highly error prone, particularly with non-degreed engineers manually completing forty to fifty letters per day.

Castillo Engineering, an engineering firm with over 25 years of experience, hopes to change all of that with a new venture, Castillo says Solar Letters will fully automate structural letters, professional engineer (PE) stamps, and post-installation letters for residential solar installation companies in all 50 U.S. states as well as overseas design firms.

“The Solar Letters platform is a game-changer for LGCY,” said Ben Ogden, Manager, Design and Engineering, LGCY Power. “It has simplified the structural and electrical engineering process and increased our turn times on stamped projects.”

As a result of investing in advanced automation and its database of over 40,000 authorities having jurisdiction (AHJs), and associated codes that have been continuously updated since 1998, Castillo says that Solar Letters has been able to guarantee its 99 percent AHJ approval rate. In terms of volume, Solar Letters will be able to “generate over 100,000 solar letters per month.”

Solar Letters is also putting money where its math is, guaranteeing “the fastest turnaround time in the industry – or a full credit will be issued, as well as the lowest price, which includes price matching,” according to the press release.

The company also offers volume discounts through its Permit Partner Program, in addition to a full credit if a letter receives an AHJ rejection.

“We are very excited to launch in response to the high demand for residential solar letters and PE stamps we are seeing globally,” said Christopher Castillo, CEO of Solar Letters. “We look forward to providing the same elite customer service experience for clients as we do through Castillo Engineering. Helping solar installers drastically cut soft costs and mitigate project risks are necessary to ultimately enable solar energy to proliferate across the globe.”

The company is currently preparing for a round of investments to both further improve its automation and AI integration to provide additional quality control through its platform. Solar Letters is expected to incorporate AI into its platform this year as well as throughout next year.

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