We remained unwavering in our dedication to Our installer training programs continued to expand in 2023. We oered more enhancing customer experience, fortied our training than 45 dierent certication and qualication courses on our products, and they are available in 18 native languages across the United States, initiatives globally, and broadened the reach of our Latin America, Europe, South Africa, Australia, and Brazil. We expanded our installer network installer training programs for our batteries in 2023 and have certied more than 4,700 installers worldwide for our IQ Batteries. We have more than Our worldwide customer service Net Promoter Score (NPS) surged to 77 in 12 regional training centers spread across the United States, and use vans 2023, compared to 69 in 2022. We worked on root cause xes to eliminate equipped with our products to bring training to installers in remote locations problems, trained our customer service personnel, expanded our eld service across the United States and Puerto Rico. We also have dedicated training teams globally, and improved our business processes. In addition, we made events in the United Kingdom, the Netherlands, Belgium, France, Spain, Italy, good progress on solving customer problems by using the data streaming Austria, Germany, Poland, Sweden, Denmark, South Africa, Australia, the from our systems to the cloud, identifying problem patterns and rolling out Philippines, Thailand, India, and Brazil, with more planned in 2024. Training is software xes to the eet. Our data science team works proactively to identify also available on demand via our YouTube channels spanning the globe, where eet problems and x them before customers call us. we currently have more than 6,000 subscribers. “Quality is at the forefront in Quality and reliability remained integral to Enphase in 2023. Our goal is “We expanded our installer training In addition, by the end of 2023, we expanded our Enphase Installer Network every step of our design and to provide the most reliable and resilient energy systems. Quality is at the programs for our batteries in 2023 (EIN) in the United States, Australia, the Netherlands, Belgium, France, the manufacturing process, and we forefront in every step of our design and manufacturing process, and we and have certied more than 4,700 United Kingdom, Mexico, Puerto Rico, and India. Our EIN has been a highly have established some of the have established some of the industry’s most rigorous quality standards. For installers worldwide for our successful initiative as we continue to add trusted installers who act as our industry’s most rigorous quality microinverters, our target is less than 500 defective parts per million (DPPM), IQ Batteries.” product evangelists and are expected to provide exceptional experiences to standards.” which translates to a failure rate of less than 0.05%, shipped on an annualized homeowners across the globe. By the end of 2023, we had approximately 1,750 basis. In practice, we operate close to the target. Our target is similar for installers in our EIN worldwide through a highly selective process focused on IQ Batteries. installation quality and homeowner experience. Manufacturing line at our Flex contract manufacturing facility in Columbia, South Carolina Installer training in the Sacramento, California regional training center 16 ENPHASE CEO LETTER TO SHAREHOLDERS 2023 17