UL 3741: Photovoltaic Hazard Control and the 1000V System This is part 2 of Sean White’s explanation of UL 3741, also known as photovoltaic hazard control and otherwise known as rapid shutdown. The UL 3741 listing came out in 2020 and it takes time for manufacturers to come up… Continue reading “UL 3741: Photovoltaic Hazard Control and the 1000V System”
Changing Standards for the PV Industry: UL 61730 for PV Modules and UL 3741 for PV Hazard Control (Rapid Shutdown UL Listing) Codes and standards are regularly updated for the constantly evolving solar and storage industries. Sean White and Bill Brooks recently updated their advanced codes courses on HeatSpring to include information on UL 61730 and UL 3741. Here’s some information on… Continue reading “Changing Standards for the PV Industry: UL 61730 for PV Modules and UL 3741 for PV Hazard Control (Rapid Shutdown UL Listing)”
The Whys of String Sizing Let’s go over the whys of string sizing. What is it and why do we do it? String Sizing Basics String sizing is critical when you’re putting modules in series. Remember that when you put modules in series, the voltage… Continue reading “The Whys of String Sizing”
Sean White Explains AC-Coupling, DC-Coupling, and Types of Inverters With demand increasing for energy storage, more solar customers have questions about how batteries can work with their solar systems. Let’s talk about how to couple PV and batteries as well as the various types of inverters on the market. … Continue reading “Sean White Explains AC-Coupling, DC-Coupling, and Types of Inverters”
Energy Storage Basics: Sean White’s New Book Instructor Sean White just published his latest book, “Energy Storage Basics” on Amazon. Sean has written other books, but it’s still a big deal and we want to congratulate him on this latest release. We asked Sean why he wrote… Continue reading “Energy Storage Basics: Sean White’s New Book”
How do I Understand Optimal Voltage Drop Percentage? Q+A from NABCEP Advanced PV Installer Training I have question about voltage drop. In my area, some sources say if Voltage drop is less than 3% it is ok, some sources say it must be not more than 2%. How do I understand optimal Voltage Drop %?… Continue reading “How do I Understand Optimal Voltage Drop Percentage? Q+A from NABCEP Advanced PV Installer Training”