Sounds like you will be making a system like this:
406demo
Here's the product page from Tekmar, who makes the (not cheap) control:
Alternative Energy
I usually post up pics and drawings, but your envisioned rig is unique, and I can't find any that are easy to read. The product literature has plenty of schematics and application drawings included, and (especially the flash demo) should spark your imagination enough to figure out how to plumb what you want.
Happy reading! Let us in on what you decide to do.
EDIT: I found another diagram:
Advanced Technology | Energy Environmental