What size wire and size fuse I need?

[Coopdevil123]

I have 6 140ah agm 12v batteries that I want to wire in parallel for my off grid solar set up for my van life. I was thinking using 4 gauge wire with a 150a fuse switch to a bus bar to an 80a fuse switch to the MPPT. I have 4 255w that will be wired in series to a 10 gauge wire to a 150a fuse switch to the MPPT.
and from the bus bar will be a 6 gauge wire to 2 fuse boxes to a few usb ports and 12v car sockets

 

[DIYrich]

4 awg wire is rated for 135 amps chassis wiring, so you would want a 100 Amp fuse.

6 awg wire is 100 amps, so 80 Amp fuse.

10 awg wire is 55 amps, so 40 Amp fuse.

If wire is in conduit, then even lower.