1x solar panels battery charge controller(30a) 1x user manual specification:model: pwmstep-down charging: 28.8vfloating charge: 27.4vusb output: 5v / 3aself-consumption: less than 10madischarge stop: 21.4vvoltage: dc 12v / 24vmaximum solar input: less than 50vcurrent: 30arated working current: less than or equal to 20areconnect after discharge: 25.2vworking temperature: -35°c~60°coutput voltage: 12v / 24v automatic identification voltage -with timer and light sensor, it could work for solar light system(only for off-grid pv solar system): -for 10a 12v pv system: 120w solar panel, 12v lead-acid battery, 21v for max input voltage. -for 10a 24v pv system: 240w solar panel, 24v lead-acid battery, 42v for max input voltage.