Duramax generator to big propane tank

[nokiasixteth]

I have the duramax 5500 generator dual fuel and only have ran it on propane small bottles . I use it when grid goes down and there is no sun for the solar panels to be on.
I have a big 150 gallon or so propane tank i want to use instead of the small gas grill tanks. Question is has any one done that before on here that can shoot pointers to me.