Specification:- Size: 14 x 7.6 x 4cm- Package weight: 6.3oz/178g- Rated voltage: 12V/24V- Voltage of ending power supply: 10.8V- Recovery voltage of power supply: 10.8V- Voltage of ending charging: 14.7V or 29.4V- Rated charging current: 30A- USB output voltage: 5V- USB output current: 1A- DC output voltage: 12V or 24V- DC output current: 1A- Rated load current: 30AFeatures:- High charging efficiency, tandem PWM charging way, longer battery life- Over-load protection- Short circuit protection and Protect from the lighting strike- Reserve discharging protection and Reserve-polarity protection- Under-voltage protection- Overcharging protection- 12/24V self-adaptive, USB 5.0V mobile phone charging, and dual-way DC12/24V output- NOTE: If the battery is 12V, then the output is DC 12V. If the battery is 24V, then the output is DC24V.Notes:1. The controller should be connected to the battery first2. Please carefully check and confirm the voltage of the components before connecting, and the voltage of the solar panel is 18V, the voltage of battery is 12V, the rated voltage of load is 12V3. The rated current of Solar panel and load must be less the than the rated current of controller4. Either 12V or 24V battery system. Maximum voltage photovoltaic panels can not exceed 47VNote: More detail specification pls. check the picture on the product show!