KBL401 is a Chinese brand of solar control board manufactured and sold by Yangjie New Energy Technology. The KBL401 is a microcontroller-based solar controller that can be used to control a variety of DC systems and devices, such as a 12 VDC motor,fan, lighting, solar panels, and other devices. The KBL401 features digital LCD display and has built-in protections to avoid overcharging, reverse polarity, and other unnecessary system damage. It also contains several ports for connections to external devices as well as an RS485 communication protocol for access to solar card data. The KBL401 is a versatile, economical and reliable solar control board with a user-friendly interface that provides an easy way to install and operate a solar power system.