Wire from SCC to Breaker/Disconnect and on to busbar and battery

DIDDLYV

Solar Enthusiast
Joined
Mar 1, 2021
Messages
91
I have 4 210 watt solar panels that will be connected 2s each to its own EPever 40 Amp SCC.
Panel specs
  • Power: 210 Watt
  • 6 Busbar
  • Monocrystaline
  • Vmp: 22.42V
  • Voc: 24.9V
  • Imp: 9.37A
  • Isc: 9.85A
  • Maximum System Voltage: 600V
  • J-Box is IP67 Rated with Diodes
  • Cables: 12AWG, approximately 3 feet
  • Wire size (leads on the back of panel)
  • Height: 58.8125 in.
I have 10 Guage Solar Cables running down to the SCC thru a 20 amp breaker/cutoff which should be carrying approx 9-10 amps at 50 volts more or less this should convert to approx 38 Amps from the SCC to the batteries at 12 volts. Will I be able to run just the 10 guage wire to the 50 AMP breaker and busbars on to the batteries a distance of no more than 2 to 3 feet or should I plan on doubling up the 10 guage wire or bite the bullet and get a few feet of 8 or 6 guage wire. I might have some 6 left over from the AC runs to and from the MultiplusII.
Inquiring minds want to know!
 

HRTKD

Boondocker
Joined
Apr 24, 2020
Messages
6,476
Location
Somewhere South of Denver
10 gauge should give you a 2.08% voltage drop. 6 gauge is .85% voltage drop.

I chose to run 6 gauge between the solar charge controller and the common bus bars. My solar charge controller produces 50 amps, at most.

I assumed the following:
Amps: 40
Length: 6' (round trip, worst case)
Voltage: 12
 

DIDDLYV

Solar Enthusiast
Joined
Mar 1, 2021
Messages
91
Thanks got some 6 Guage wire prolly 2 x feet more than what I need but better to have and not need than need and not have.
 
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