Current, voltage drop and protection for the DC side.
Cable sizing for current and voltage drop
Size for the surge current and check the voltage drop over the actual run — the two criteria often disagree.
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Fuses, breakers and protection
Fuse at the battery terminal, closest to the source of energy.
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Questions
Short answers to the ones that come up most.
What size cable do I need?
Big enough that the voltage drop over the run stays under about 3%.
Where does the fuse go?
At the battery terminal, within 30cm of the positive post.
Do I need a disconnect switch?
Yes for anything above 24V — it makes service work safe.
