Which type fuse for inverter?

[NatureMama]

I have 300Ah lead carbon batteries @12V and a 2000w inverter. I see a lot of folk are using the Victron lynx and mega fuses, but then have read that the inverter should have a fast acting fuse such as ANL, MRBF or T class. So which is the best option? Also should it be a slow or fast fuse between the battery and the MPPT controller? Mine requires a 50A fuse.