haze5736
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1970 Fan Lee Liner 16'
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Post by haze5736 on Apr 6, 2020 7:36:19 GMT -8
I'm looking for some help with selecting the proper size 12 v wire for my application.
I am using a Progressive Dynamics PD4000 power center. The DC side is capable of supplying 60 amps. There are 2 30 amp fuses feeding the power wires.
My 12 v positive wire from the battery to the power center will be at most 12 feet. My 12 v ground wire from the battery to the chassis will be about 2 feet. My 12 v ground wire from the ground bus bar to the chassis will be about 2 feet.
I'm assuming I should size the wire based on the 60 amp capability of the power center even though my load will probably be a lot smaller.
When all is said and done my loads will be:
8 LED lights 1 cigar lighter outlet for charging devices. I think our cell phone charger uses between 2 and 3 amps. Refrigerator Water pump
Thank you.
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Post by vikx on Apr 6, 2020 11:50:17 GMT -8
The PD converter manual should have instructions on wire gauge to the battery. The 45 amp PD I installed required #6 hot wire and the run was about 6 feet. For a longer run, you may need to go larger. (#4?) #6 ground was also required. There is also a required separate ground from the converter body to the frame.
The converter will only supply the amperage needed/drawn; it won't "push" 60 amps down the line.
For each 12 volt circuit, 14ga automotive wiring is sufficient. I usually have 3 circuits, upper kitchen cabinet and vent fan, pump + cigar plug and an extra circuit for lighting. 14ga is rated at 15 amps or below.
The main 12 volt frame ground should be at least 10ga. For your combo converter, you will need the required 110 frame ground as well. I would say #6 bare copper but check your manual.
If you are running a 12 volt refrigerator, you will need heavier wire as the manual dictates and it would be on a dedicated circuit. My guess is 10 or 12 guage. Note: if the fridge will not be using 12 volts to cool, you will not need heavy gauge wires.
Hope this helps.
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haze5736
Member
Posts: 35
Likes: 2
1970 Fan Lee Liner 16'
Currently Offline
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Post by haze5736 on Apr 6, 2020 14:34:16 GMT -8
What type of wire can be used for DC? Only the automotive type or can the stranded THHN be used?
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Post by vikx on Apr 6, 2020 20:07:07 GMT -8
I use automotive wire because it is flexible and made to "travel" without damage. I don't like using THHN as it's harder to work with. (too stiff)
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