Description: Safety instruction: Make sure your battery has enough voltage for the controller to recognize the battery type before first installation. The battery cable should be as short as possible to minimize loss. The regulatoris only suitable for lead acid batteries: OPEN,AGM, GEL,it is not suitedfor nickel metal hydride, lithium ions or other batteries. The charge regulator is only suitable for regulating solar modules. Never connect anothercharging source to the charge regulator. System connection: Connect the battery to the charge regulator - plus and minus.it will show 1 ,if it detects12V battery, 2 if it detects 24V battery. Connect the photovoltaic module to the regulator - plus and minus. Connect the consumer to the charge regulator - plus and minus. The reverse order applies when deinstalling. An improper sequence order can damage the controller. Specification: This controller can only be used on lead-acid batteries, LED display. PWM battery charging. All necessary protections equipped. Adjustable controlling parameter of the system. Battery Voltage : 12V / 24V. Charge Current : 30A/20A/10. Discharge Current : 30A/20A/10A. Working Temperature : -35 to +60. Application : Home, Industrial, Commercial. Self consume : 10mA. Float Charge : 13V. Discharge stop :10.7V. Discharge reconnect :12.6V. Size : 133 x 70 x 32mm. Weight:160g. 12V battery can only access 18V-20V solar panels. 24V battery can only access 36-40V solar panels. 30A 12V/360WMAX 24V/720WMAX). 10A 12V120W MAX 24V/240WMAX). Notes: There might be a bit color distortions due to different computer resolutions. There might be a slight error due to different hand measure. Package include: 1 * solar charge controller. 1 * user manual.