We can set mppt150-70 solar controller for you when you buy it, or you can set it yourself according to the manual. First of all, in the current status display, press and hold setup for 3 seconds to enter the setting menu, press and select the option to be set, then press Select to enter the option, and use up and down keys to change the value of flashing bit, Press until all bits are set, press setup to return to the previous menu. Or you can watch our operation video to better solve your problem.