I have a homemade 700w portable solar panel. With these tap connectors I can easily create a serial/parallel setup and get the most out of my VE 150/45 controller. They are very well built and easy to set up. It is a key component of my solar system and reduces the amount of wiring. Fewer cables mean fewer losses and more efficiency. I would highly recommend them to anyone who needs proprietary connectors. High quality and value for 5 stars.