The GR300 is Gridless Revolution's new standard charge controller for all solar generators. When purchased separately it can be mounted flush in an RV, van, on a wall, or in your own unique application. Automatic battery recognition for 12/24V Flooded, AGM and GEL batteries. Lithium batteries can be manually set. Modern and Efficient 3-stage PWM charging: equalize, boost and float (for Flooded, AGM and GEL). 2-Stage user friendly settings for lithium batteries. Simple menus with a Large Back-lit LCD display. The display shows system status, solar input current, solar input voltage, battery voltage, and battery state of charge (%). The menu rotates through these parameters automatically, so a wireless camera can be used to remotely monitor them. Temperature compensation for better battery charging in cold or hot ambient temperatures. Features Automatic battery recognition for 12/24V Flooded, AGM and GEL batteries. Lithium batteries can be manually set. Modern and Efficient 3-stage PWM charging: equalize, boost and float (for Flooded, AGM and GEL). 2-Stage user friendly settings for lithium batteries. Simple menus with a Large Back-lit LCD display. The display shows system status, solar input current, solar input voltage, battery voltage, and battery state of charge (%). The menu rotates through these parameters automatically, so a wireless camera can be used to remotely monitor them. Temperature compensation for better battery charging in cold or hot ambient temperatures. Specifications Part Number GR300 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 0.10 W Max Solar Panel Input VOC 55V DC Max Solar Panel Input Power 450W/12V; 900W/24V Rated Charging Current 30A Max Ambient Operating Temperature -35C to +45C Weight 1.0 lb Dimensions 5-5/8" x 4-1/4" x 1-5/8" Country of Origin Made in China to Gridless Revolution's Specifications PDF Manual GR300 Manual