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Old 10-30-2017, 09:18 PM   #1
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Solar Wire Type

Does anyone know if 8 AWG THHN Building Wire can be utilized as negative lead within a RV Solar wiring setup from Charge controller to Battery?
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Old 10-30-2017, 09:29 PM   #2
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If you use stranded wire, you should be ok, assuming your charge controller is 30 amp or less.
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Old 10-30-2017, 09:30 PM   #3
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There's not really enough information to give a good answer. To recommend a wire size we should know how many panels of what size, whether they're connected in series or parallel, and distance from charge controller to battery at the very least. In general though THHN wire is not the best choice for this type of wiring regardless of gauge.

For reference, my coach has four 160 watt 12v panels wired parallel with 10 gauge going to the combiner box (a fairly common arrangement). From the combiner to the charge controller and from the charge controller to the batteries I have 2 awg and the run between the controller and battery is about 4 feet.
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Old 10-30-2017, 10:23 PM   #4
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THHN is fine. Can't answer on the gauge without more info.

I have ~3' of #4 THHN from my Midnight Classic 150 controller and 1500w of panels.
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Old 10-31-2017, 03:33 AM   #5
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Thanks for quick response(s)....as requested more info...

-30 AMP PWM Zamp Charge Controller
-8 awg (type unknown) pre-installed by trailer mfg Outdoors RV to battery box..
-160 W Zamp roof mounted panel, and 4-6v Interstate batteries (225ah ea,
series/parallel) and associated bank wiring installed by Portland dealer.
-Bought short extension 8 awg THHN stranded cable;

I want to extend existing factory installed 8 awg solar negative termination in battery box to far side of battery bank as it's about a foot short of reaching that cross bank negative terminal. Plan on attaching both 8 awg negative cables via 5/16th Junction post. Plus adding a Docooler Battery Terminal Switch Quick Cut-off Disconnect to same negative terminal.

Wasn't sure about the short section of 8 awg THHN wire I bought after looking on-line and finding it identified as Building wire. Better choices?
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Old 10-31-2017, 09:01 AM   #6
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measure the length and get the wires from big red or blue box. it'll be fine.
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Old 10-31-2017, 10:18 AM   #7
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

Can't answer your question but wanted to say hello! Keep her between the ditches!

Good luck, happy trails, and God bless!
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Old 10-31-2017, 10:46 AM   #8
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Quote:
Originally Posted by jfriedhoff View Post
Thanks for quick response(s)....as requested more info...

-30 AMP PWM Zamp Charge Controller
-8 awg (type unknown) pre-installed by trailer mfg Outdoors RV to battery box..
-160 W Zamp roof mounted panel, and 4-6v Interstate batteries (225ah ea,
series/parallel) and associated bank wiring installed by Portland dealer.
-Bought short extension 8 awg THHN stranded cable;

I want to extend existing factory installed 8 awg solar negative termination in battery box to far side of battery bank as it's about a foot short of reaching that cross bank negative terminal. Plan on attaching both 8 awg negative cables via 5/16th Junction post. Plus adding a Docooler Battery Terminal Switch Quick Cut-off Disconnect to same negative terminal.

Wasn't sure about the short section of 8 awg THHN wire I bought after looking on-line and finding it identified as Building wire. Better choices?
#8 THHN will be fine. It's what I would use in same/similar system.
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Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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