
AllSpark
Depends what is on the roof and under the bonnet. A solar controller, DC-DC charger, inverter, main distribution and a winch or compressor circuit fills 5 quickly. If you are only running a fridge and lights, a smaller block does the job and leaves the bulkhead tidier.
The total current passing through the shared bar that feeds all 5 holders. Individual holders go to 200A, but the bar is the bottleneck, and so is the cable feeding it. Size that incoming cable for the real combined load and protect it at the battery end.
You mostly do not, until you pull them. Midi fuses are not always obvious when they let go, so label every holder as you wire it and carry spares of each rating. A block of 5 unlabelled fuses at dusk in the rain is a miserable way to learn this.

AllSpark

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AllSpark

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AllSpark

AllSpark
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