Our most durable charge controller, the GR220 is fully potted, IP68 waterproof, and features a heavy duty aluminum casing with heat sink fins for maximum heat dissipation. Extremely capable: Used in our Fortress solar generator, the GR220 has a input voltage of 50V max and can charge SLA, AGM, Deep cycle lead acid, lithium iron phosphate (LiFePO4) and Lithium Nickel Cobalt batteries. The GR220 also features a 20A load output which makes it perfect for lighting applications. Prewired silicone insulated wire leads allow for fast installation. ? Manual Specifications: Part Number GR220 System Voltage 12V DC or 24V DC Charge Method PWM Battery Compatibility Deep Cycle Lead Acid Flooded Lead Acid Sealed Lead Acid (SLA) Gel Lithium Lithium Iron Phosphate (LiFePO4) 3S Lithium Nickel Cobalt No Load Loss 0.12 W Max Solar Panel Input VOC 50V DC Max Solar Panel Input Power 240W/12V; 480W/24V Rated Charging Current 20A Max Ambient Operating Temperature -20C to +50C Weight 0.30 lb Dimensions 3-1/4" x 2-5/16" x 1" Country of Origin Made in China to Gridless Revolution's Specifications