I would need to read the directions, but maybe what they meant was that the wire supplying the power to the panel should be big enough to handle at least 150 amps and fused between the battery and the panel with a 150 amp fuse?
I count 12 fuse blocks on that panel. If they all had 10 amp circuits that ran at the same time, that's 120 amps. (unlikely that would ever happen, but you need to plan for the worst)
1983 Fraser 41
La Conner, WA
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Boating for over 25 years, some of them successfully.