get to know the charge controller

if you change the 3rd "to the battery, to the output" setting to 9volts you can then use the two usb outputs, charging at 4.5volts each

does charge 12volt batteries

does output to grid tie inverter

only battery charge with one button click

hint, make sure the 3rd settings read 9volts. does a good job

https://www.banggood.com/custlink/vD3YADriza