panel wiring

ws9876ws9876 Solar Expert Posts: 399 ✭✭✭
 For 1 panel ,12v charging 300 watt panel ,only putting out about 25-28 volts,,KID controller.... I have a 15 ft run from panel to jct box using 12 ga metal jacket romex,then I want to use available 14 ga romex for 25 ft to KID. Just for 1 panel.
Any reason I cant do that?


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