Uses Maximum Power Point Tracking (MPPT) for maximum efficiency and charge rate. Able to charge lead acid (sealed, gel or flooded) or lithium battery banks between 8V to 32V, and supports 12V solar arrays up to 260W or 24VDC arrays up to 520W. It features bulk, constant and float charge stages for rapid, efficient and safe battery charging, with feedback on charge status, current, voltages, etc. shown on the LCD screen. Built into a durable case for permanent installation with heavy duty screw terminals for cabling up to 10AWG. Note: To use the Lithum feature of this Charge Controller you will need to Purchase MP3746 to program this controller with details from your battery's data sheet. Advanced MPPT control technologyHigh tracking and conversion efficiencySupports Sealed, Gel or flooded lead acid and Lithium batteries3-stage intelligent chargingMultiple load work modesExtensive electronic protectionBacklit LCD displayRS485 communicationCommon negative groundingCompatible Battery Bank Voltages 12 / 24VDC Selectable Maximum Input Power 520W (12VDC System) / 260W (24VDC System) Input Voltage 16 - 100VDC Max Load Current 20A Dimensions 221(H) x 155(W) x 52(D)mm, 940g