Author Topic: What size wire from controller to battery  (Read 632 times)


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What size wire from controller to battery
« on: May 08, 2021, 06:42:28 PM »
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.



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Re: What size wire from controller to battery
« Reply #1 on: May 08, 2021, 09:55:56 PM »
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 - Two systems -- 4 SW+ 5548s, Surrette 4KS25 1280 AH X2@48V, 11.1 KW STC PV, 3X MidNite Classic 150 w/ WBjrs, Beta KID on S-530s, MX-60s, MN Bkrs/Boxes.  Thanks MN for Great Products/Service/Support!


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Re: What size wire from controller to battery
« Reply #2 on: May 08, 2021, 10:12:56 PM »
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 .

« Last Edit: May 08, 2021, 10:16:10 PM by ClassicCrazy »
system one
Classic 150 , 5s4p  Kyocera 135watt , 12s Soneil 2v 540amp lead crystal for 24v pack , Outback 3524 inverter
system two
Classic 150 ,5s 135 watt Kyocero , Jakiper 48v LiFePO4 , Outback VFX 3648 inverter
system three
Midnite KID MPPT 24 DC in to  12 volt AGM batteries