Hi,
I run the same Xantrex Inverter/Charger and have a 400amp T-fuse.
A 250amp is traveling with us as backup.
The BlueSea devices looked and worked the best for me.
The Fuse shall be as close as possible to your batteries.
Only the + line needs to be fused.
My learning curve during install was how important it is to make you own cables.
Here are a few good links to wiring diagrams which helped my 1 cell brain a lot.
You see that there a different methods wiring from the catastrophic fuse possible.
https://static1.squarespace.com/stat.../99-TRLSLV.pdf
https://www.mortonsonthemove.com/upl...system__2_.pdf
Blog:
https://www.mortonsonthemove.com/tom...rstream-argosy
Mike