Here is a fragment from the manual. I have a couple of guesses about this, but can't connect power sources together based on a hunch .
Does anyone understand, better yet use this?
Thank you
Grid was down due to storm and the batteries at 7% so I was changing every imaginable menu.
In the end I hooked up the generator to AC input.
That worked. It is unacceptable as a regular practice but addressed the emergency need.
You have to be really really sure you have grid disconnected. And I do have a lockable safety switch. But still don't like it.