Features: 1. Automatically identify system voltage, 12/24V automatic identification. The positive poles of solar panels, batteries, and solar charge controllers are all connected together, and negative MOSFETs are used to control the circuit in series. 2. Using the optimized control chip, it truly realizes three-stage PWM charging, and the charging efficiency is 15% higher than that of products of the same level. 3. The shell is made of high-quality flame-retardant PC material, which is firm and durable. The back cover is made of aluminum alloy heat sink cover, which greatly improves the heat dissipation performance, and improves the conversion efficiency and service life of the product. 4. Easy to install and operate: Large LED display, can clearly display working status and data, 2 function power buttons, switch mode and parameter configuration. 5. Multi-purpose application: Load control mode can be selected, night street lamp timer function can be reset; discharge capacity control; ampere-hour discharge counter. Accurate temperature compensation, automatic correction of charge and discharge voltage, improve battery life. 6. Good heat dissipation performance: Double reverse current protection, low heat generation. All electronic components generate heat when they are in operation, and it is best to shield them to better dissipate heat and avoid direct sunlight or damp places. 7. Reliable protection: Reliable overvoltage protection, short circuit protection, overload protection, overcharge protection, overdischarge protection, reverse connection protection, overheating temperature protection. Specifications: Name: Solar controller Voltage: DC 12V / 24V automatic identification 30A Maximum PV input voltage: 50V 30A Applicable battery type: lead-acid battery 12/24V Self-consumption: ;10mA Charging method: PWM Overcharge protection: 14.4V / 28.8V Overcharge and floating charge: 13.8V / 27.6V Charging recovery voltage: 12.6V/25.2V Over discharge protection: 10.8V / 21.6V Over discharge recovery: 12.6V/25.2V Dual USB output: 5V/2.1A (charging mobile phones, for iPads, etc.) Operating temperature: -20°C to 55°C Temperature compensation: -24mv/℃ FOR 12V system Product size: as shown in the picture Load control mode: Working all day, pure light control, light time control. Product weight: 420g Notice: Install the solar charge controller as close to the battery as possible to avoid voltage drop caused by too long wires and affect normal voltage judgment. Notes: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Please allow 1-3mm measuring deviation due to manual measurement. Thank you for your understanding! Packing List: 1 X Solar Panel Controller 1 X User Manual