Check the listing for details. ESMART MPPT SOLAR CHARGE CONTROLLER RS232 PORT. Condition: New. Listed at 299.99 USD. ESMART MPPT SOLAR CHARGE CONTROLLER RS232 PORT.1.High conversion efficiency maximum 99%;2.12v/24v/48v system auto recognition; 3.Support all kinds of battery; 4.Fast charge/Constant charge/Floating charge 3stage charge the batteries;5.With DC output;6.RS232 Communication port.1. MPPT charging mode, peak efficiency up to 99%, saving 30%~60% solar panel than traditional PWM controller.2. DC12V/24V/48V battery system automatic recognition, users would like to use in different system conveniently.3. DC12V/24V/48V system, maximum PV input voltage up to DC100V.4. Charge type: three stages charge fast charge(MPPT), constant voltage,floating charge, protected our battery, lead to a long use age.5. Discharge type owns always on pattern and always off pattern, it also has PV voltage solar controlling switch pattern.6. Clients can auto choose any one in the 4 kinds of commonly used batteries, Sealed lead acid, vented, Gel, NiCd and custom other batteries.7. Digital tube display controller battery voltage and charging current,upper computer display various parameters, such as model, PV input voltage, battery types, battery voltage, charging current, charging power, working condition etc.8. RS232 communication, and that providing communication protocol, it’s convenient for customer’s integration management.9. This controller could be paralleled infinitely..