What amp fuse for house battery?

[Mobilesport]

What amp of fuse do I use for the house battery 4 guage cable
Thanks

 

[ccbreder]

http://www.genuinedealz.com/voltage-drop-calculator

Fuse to protect the wire. Fuse as close to battery as possible. I use blue sea battery terminal fuses. If I used 4 awg, I would use no more than 150 amp fuse.