B230 and B300 specs using expansion cable P090A

Isn’t the expansion port an input and an output? Seems like it should be listed as an input, with specs. Before buying an expansion battery I’d like to know what input the expansion batteries can handle when connected to my AC200MAX. Is it 200W, 500W, 700W, 900W? For example, I have 800W coming in to my AC200MAX. If I attach a B230 will the input get divided evenly as 400W/400W? If the main battery is full, will the B230 use all 800W?

I think the above thread answers your question.