This is a piece of f****** bullshit, all settings in web interface are ignored, explicitly says to use it in client mode as AP mode is unstable -- but the firmware on this device doesn't allow it. Unfortunately you need an additional device to setup the voltage regulation on your mppt controller. . However, if you bought this for this purpose, disable it after setup, otherwise anyone within range of this device could start a fire in your house by setting the charging voltage on your system to an arbitrarily high setting - there is NO safety on this device. .Really needs a firmware update!