Features: Solar Panel 12V/24V 10A/20A/30A Build-in industrial micro controller. One-key setting, auto memory function. digital display, 4-stage PWM charge management. There are Build-in short-circuit protections, open-circuit protections, reverse protections, over-load protections reverse current protections, low heat productions. With double USB ports charge The Regulator is only suitable for lead acid batteries:OPEN, AGM, GEL Max. PV Input Power: 10A: 130W (12V) 260W (24V) Safety Instructions: 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 regulator is only suitable for lead acid batteries: OPEN,AGM, GEL make Sure it is not suited for nickel metal hydride, lithium ions or other batteries. The charge regulator is only suitable for regulating solar modules. Never connect another charging source to the charge regulator. System Connection: Connect the battery to the charge regulator - plus and minus. it will show 1, if it detects 12V 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. Specification: Rated Voltage: 12V 24V Auto Application: Solar System Controller Current: 10A Size: 148*78*35mm Package: 1x Solar Panels Battery Charge Controller 1x User Manual