The exam is four hours long. It covers electrical theory, photovoltaic system design, roof load calculations, the National Electrical Code, battery storage integration, and half a dozen other domains most people would need years to feel confident navigating. Yehuda Gittelson sat for the NABCEP PV Installation Professional exam the same week he wrapped up a commercial rooftop job in Scarborough, still working through calluses on his palms. He passed.
NABCEP, the North American Board of Certified Energy Practitioners, administers what the solar industry widely considers its most credible professional credential. The PV Installation Professional (PVIP) certification requires documented field experience, accredited training hours, and a passing score on a rigorous exam administered through computer-based testing centers or live remote proctoring. Nearly 18,000 solar employees have received one of NABCEP’s many certifications, from PV Associate to PV Installation Professional, as well as specialty credentials covering sales, design, service, inspection, and energy storage. For Gittelson, pursuing the credential wasn’t a career calculation so much as a professional obligation.
“The work itself taught me most of what I know,” he said. “The certification forced me to prove I actually understood why I was doing things, not just how.”
From Wind to Panels
Gittelson grew up in Bangor and studied mechanical engineering at the University of Maine at Orono before taking a job with a wind farm development company in Aroostook County. Two years of wind work gave him a practical education in energy infrastructure that most solar installers never get: load forecasting, grid interconnection, the gap between construction timelines and permitting realities. When he relocated to Portland and took a position with Solaris Energy Solutions, he brought a systems-level framework to a job that often attracts workers trained only in rooftop mechanics.
That background shaped how Gittelson approached NABCEP preparation. Rather than drilling practice exams, he reviewed the certification handbook’s job task analysis alongside field notes from his own installs. The PVIP credential requires candidates to document project experience by system size, with larger systems carrying more weight in the eligibility calculation. For installers who spend most of their time on small residential arrays, satisfying the experience requirements can take years. Gittelson’s commercial work in Aroostook and early projects at Solaris accelerated that process.
What the Credential Actually Signals
The solar industry’s hiring patterns have shifted. Engineering, procurement, and construction firms now consider NABCEP board certifications “essential” or “very important” when evaluating candidates. That carries real weight in a state where the clean energy workforce has expanded faster than in any other New England state over the past four years. Maine’s clean energy sector employed nearly 16,200 workers in 2024, growing 4% year over year and outpacing overall job growth statewide, according to the state Department of Energy Resources.
For homeowners, the certification functions differently. A NABCEP-certified installer on a job site provides something beyond technical competence: accountability. The certification is tied to a code of ethics, continuing education requirements, and a public directory that lets consumers verify credentials before signing a contract. Nearly 90% of American homeowners who have installed solar panels are satisfied with their decision, but the remaining 10% frequently cite installer competency and project quality as their primary complaints. Gittelson is frank about what that gap means for the trade.
“There are a lot of people putting panels on roofs right now who’ve had two weeks of training,” he said. “That’s fine for some jobs. It’s not fine for a system that’s supposed to run for 25 years.”
The Recertification Cycle
NABCEP certification doesn’t end with passing the exam. Gittelson is already tracking continuing education hours toward recertification, which requires documented professional development every three years. The annual NABCEP continuing education conference offers up to 20 CEUs for board-certified professionals, and Gittelson has attended once, mostly for sessions covering battery storage integration. The rapid growth of solar-plus-storage systems has pushed even experienced installers to update their technical knowledge, and the new Energy Storage Installation Professional credential launched by NABCEP reflects that pressure.
Maine’s own policy environment has added urgency. The EPA awarded Maine’s Governor’s Energy Office $62 million through the federal Solar for All program in 2024, including funding to support workforce training for more than 700 Maine residents in electrical work, construction, maintenance, and related building trades. That training pipeline will eventually produce more competition for the jobs Gittelson holds. He doesn’t seem bothered by it.
“If more people come up through real training programs and get certified, the whole industry improves,” he said. “Right now, too much of the workforce is self-taught, and clients can’t tell the difference until something goes wrong.”
The View from the Roof
Gittelson spends most of his working days in southern Maine, driving a sticker-covered Subaru Outback between job sites across Cumberland and York counties. The work is physical, weather-dependent, and uneven in pace. Some weeks, he logs six installs. Other weeks, inspections and permitting delays chew through the schedule.
What the PVIP credential changed most, he says, is how he handles conversations on the ground, usually between himself and a homeowner watching a crew work on their roof for the first time. Those conversations require more than wiring knowledge. They require the ability to explain system sizing, net energy billing under Maine’s current policy structure, long-term maintenance expectations, and what happens if something fails outside a warranty window.
Certification didn’t make Gittelson a better installer in the mechanical sense. He was already competent at that. What it did was structure and validate knowledge he’d accumulated informally over the years, and give him a professional vocabulary precise enough to be useful when the stakes are high.