Example:
- My Panels are located 150ft from my inverter, 3450W array connected in 2s5p
- Vmp = 75.86V, Impp = 45.45A,
- Im thinking 8 AWG would be fine, lets see what the loss will be
- Wire Material – Copper
- Wire Size – 8AWG
- Voltage – 75.86V
- Phase – DC
- Number of conductors – single set of conductors
- Distance – 150 ft
- Load current – 45.45 Amps
- click “Calculate”
- Gives me a ridiculous 11.29% volt drop
- I try “2 conductors per phase in parallel”
- Result -> 5.65%
- I try 6 AWG , “single set of conductors”
- Result -> 7.10%
- I try 6 AWG , “2 conductors per phase in parallel”
- Result -> 3.55%
I determine that’s close enough for me, I go online to HomeDepot.com order myself a 500 ft. 6/1 Red & Black Stranded THHN Wire
I run two red wires and two black wires in my conduit for EACH solar array of 3450W from the panel combiner box to my inverter in my basement.
I do the same for each of my solar arrays, I may use a different color combination for the next array.
Remember to ground your Solar Panel array frames right where they stand (long ground rod)
And you’re done.