What size wire from controller to battery

Started by Regeaux, May 08, 2021, 06:42:28 PM

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Regeaux

I'm setting up my solar system with a used Midnite Solar Kid. What size wire do you run from your controller to the battery? I have tried 4 AWG and 6 AWG and both of those were too big.

Thanks,

Vic

Hi Regeaux,  welcome to the Forum,

The largest cable that can connect to the terminal block,  inside for the KID PV  and battery connections is #10 AWG THHN building wire (NOT Fine Strand cable).

It is possible,  that the chassis that the KID can mount into  might have the capability  of accepting larger cable.  If not,  you could use #10 AWG from the KID terminal block,  to your battery circuit breaker,  and a larger cable from the battery side of that breaker,  to the battery.   Larger cable is usually better,  especially on 12 V systems.

FWIW,   Vic
Off Grid - Sys 1: 2ea SW+ 5548, Surrette 4KS25 1280 AH, 5.25 KW PV, Classic 150,WB, Beta Barcelona, Beta KID
Sys 2: SW+ 5548s, 4KS25s, 5.88 KW PV, 2 ea. Classic 150, WB, HB CC-needs remote Monitoring/Control, site=remote.
 MN Bkrs/Bxs/Combiners. Thanks MN for Great Products/Svc/Support&This Forum!!

ClassicCrazy

#2
Here is a wiring diagram for Kid that shows  using some external breakers and terminal blocks  which lets you transition to larger wire sizes from 10 gauge if needed .
https://www.midnitesolar.com/pdfs/KID_PAR_Wiring_REV_B.pdf

Larry
system 1
Classic 150 , 5s3p  Kyocera 135watt , 12s Soneil 2v 540amp lead crystal for 24v pack , Outback 3524 inverter
system 2
 5s 135w Kyocero , 3s3p 270w Kyocera  to Classic 150 ,   8s Kyocera 225w to Hawkes Bay Jakiper 48v 15kwh LiFePO4 , Outback VFX 3648 inverter
system 3
KID / Brat portable