Hello from Northern California, South Bay Area

Hedges

I See Electromagnetic Fields!
Joined
Mar 28, 2020
Messages
9,138
3/0 is 0.06 ohms per 1000', 2/0 is 0.08
1/(1/0.06 + 1/0.08) = 0.034 ohms per 1000' for both in parallel.
100' round trip, 0.0034 ohms.
125A x 0.0034 ohms = 0.43V drop, < 1% of 48V
Even for 5x current surge you're fine.
 

Maintenance guy

Solar Enthusiast
Joined
Nov 30, 2021
Messages
33
It seems to be the 3/0 will have a .4 voltage drop and the 2/0 cable a .5 voltage drop but that is calculated separately @ 45 feet.
 
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