Could you please check my electric diagram?

[sat_be]

Better use a real fuse, the ones on your picture usually trip at around 60A.
MidiOto Fuse and Reichelt fuse holder:

How to choose a fuse to protect the battery

80A is probably too small. I had a 150A fuse but it burnt several times when I tried to get on the board in choppy water (peak current was around 70-90A but this was enough to heat up the fuse and it finally burnt through). I‘m going to change it to 200A. https://www.reichelt.com/ch/de/car-fuse-midioto-200-a-58-v-purple-imaxx-mdp200-p290809.html Fuse holder: https://www.reichelt.com/ch/de/fuse-holder-midioto-imaxx-hmd1-p229126.html It is quite compact, there are other fuses but they are larg…