Sizing cable from solar controller to bank, what size breaker?

[WithAlligators]

Hey folks,
I'll have 3 327w PV mods on the roof of my sprinter. Each will have a 20A inline fuse and a go to a Victron 150/85 MC4. Should I plan on the max amps of ~82 at 12V and get an 80A breaker? Can I size slightly higher incase I upgrade the panels to 360w/370w if I can ever source them, and put a 90A breaker in there? Or am I doing something wrong?
Cheers!

 

[dwh]

327w x 3 = 981w
981w ÷ 10.5v (dead battery) = 93.4a

You need wire sized to handle 100a and a 100a breaker or fuse to protect the wire.

Or maybe a bit bigger. Solar panels can put out more than their STC rating when very cold.

 

[dwh]

You can oversize the wire for a later upgrade. If you do just use a fuse or breaker sized to protect whatever size wire you use.