JimboJambo

I would use 80 amp dc fuses as the battery would be the limiting factor your inverter would be able to deliver 3300 watts and your battery current would be 75 amps, maximum for your battery. 160 amp fuses are too high get them changed.

Thanks for the heads up. The battery has a peak discharge of 100A for 15s so the 80A fuses should be ok then with the additional settings on the inverter set to 70A like you've said.
Have to request an RMA from the people I bought this kit from now 😑

That battery has a maximum charge/discharge of 75A. The normal levels are 50A.
Thus you would rather blow a fuse than exceed 75A.
If your inverter has settings for these maximums I would use the 80A only but set the inverter on say 70A.
If the inverter does not cater for these settings rather use a 63A fuse to stay save.