While the article probably doesn’t use UL listed equipment, I’ve found that equipment exists that does such as eg4. They run 48v which makes it legal in additio

While the article probably doesn’t use UL listed equipment, I’ve found that equipment exists that does such as eg4. They run 48v which makes it legal in addition to being Ul listed. It’s typically the installation between solar panels and power inverter/converter that needs to be up to code.