I did a bit more digging on this. The link below says to keep power losses at 3% or below.
https://www.engineeringtoolbox.com/a...uge-d_730.html
Quote:
Conductors in electrical systems should not be sized with voltage drops exceeding 3%.
For a 12V system the maximum voltage drop should be less than (12 V) x 3% = 0.36 V.
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So, I used this link to calculate the power loss.
Voltage Drop Calculator
It looks like 12 gauge wire gives me 2.5% power loss. 10 gauge gives a 1.6% power loss. So I think that 12ga should be a good fit.
Thoughts?