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07-26-2015, 05:32 PM
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#1
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Member
RV Trip Wizard Grand Design Owners Club
Join Date: Sep 2014
Posts: 46
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15 to 50 amp cable
Hi all. I need to build a 50 amp female to 15 amp conversion cable so I can plug my trailer in to keep the fridge cold and the batteries charged. Any suggestions would be appreciated.
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07-26-2015, 05:46 PM
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#2
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Senior Member
Join Date: Nov 2008
Location: Cosby, Tn
Posts: 6,587
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Steve Ownby
Full time since 2007
2003 Monaco Signature
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07-26-2015, 05:54 PM
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#3
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Senior Member
Winnebago Owners Club
Join Date: Jun 2013
Location: Full-timer/volunteer w/SOWERS
Posts: 3,958
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Quote:
Originally Posted by NavyDiver198
Hi all. I need to build a 50 amp female to 15 amp conversion cable so I can plug my trailer in to keep the fridge cold and the batteries charged. Any suggestions would be appreciated.
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Even Walmart has them if your store carries RV stuff. I strongly suggest that you run these things from a 20A circuit. The 14 AWG wire in a 15A circuit has too much loss and may cause problems for your rig.
The conversion cam be done in steps. You can "dog bone" from 50 to 30 and then use the 30 to 20A adapter.
Happy trails,
Rick Y
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Rick & Melissa Young, 2011 Itasca Meridian 40U, Frtliner XCL, Cummins ISL 380HP/DEF, Allison 3000 MH, 2014 Honda CR-V, SMI AF1, Blue Ox, EEZ TPMS, TruCenter steering control
Servants On Wheels Ever Ready. Best job we ever paid to do  . (full time volunteers)
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07-26-2015, 06:24 PM
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#4
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Senior Member
Join Date: May 2010
Posts: 1,048
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I use this.
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2008 Tundra DC, 5.7L, Airlift 5000 Airbags
2013 Rockwood 8282WS
Signature Untralight Diamond Package
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07-26-2015, 06:53 PM
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#5
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Senior Member
Join Date: Jun 2010
Location: Upstate New York
Posts: 3,722
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I bought a 'Brand X' via eBay -- and it turned out to be a Marinco product. Not to say all will be a name brand item, but I was very happy plus it was a lot less money then AMAZON 
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Dave W
2011 Ford F250 6.7 Lariat CCLB, Gone but not forgotten
2014 Montana High Country 343RL (sold it!)
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07-26-2015, 11:04 PM
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#6
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Member
Join Date: Feb 2013
Location: Calgary, Canada
Posts: 57
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I have the one davendeb mentioned above and am very happy with it. Saves me bringing out the heavy 50 amp cord.
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PointyWombat
2013 Heartland Bighorn 3010RE
2012 Silverado 3500 SRW 6.6 TD
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07-27-2015, 11:04 AM
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#7
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Senior Member
Join Date: Apr 2015
Posts: 412
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The 50 amp cord is more trouble but has much less power loss than a small extension cord.
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2022 Entegra Vision XL 36C
2015 Gateway 3650BH (sold)
2005 F250 CC 4x4
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07-27-2015, 11:27 AM
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#8
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Senior Member
Join Date: Jun 2010
Location: Upstate New York
Posts: 3,722
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Quote:
Originally Posted by justafordguy
The 50 amp cord is more trouble but has much less power loss than a small extension cord.
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100% correct but where at home do you plug it in to just run the reefer as the OP said? I use an awg 12 from a 20 amp circuit for the lead to the 5er and the adapter and can run everything but the a/c with no noticeable power loss
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Dave W
2011 Ford F250 6.7 Lariat CCLB, Gone but not forgotten
2014 Montana High Country 343RL (sold it!)
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07-28-2015, 12:31 AM
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#9
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Member
Join Date: Feb 2013
Location: Calgary, Canada
Posts: 57
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I use a 100' heavy 10 gauge extension cord from a 15 Amp exterior house outlet to run the fridge and charger when needed. I wouldn't run the AC with it, but it's certainly more than enough to charge my battery bank at more than 100 amps for hours on end (about 1500 watts). I see minimal voltage drop with the 100' extension cord run using 10 gauge.
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PointyWombat
2013 Heartland Bighorn 3010RE
2012 Silverado 3500 SRW 6.6 TD
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07-28-2015, 10:36 AM
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#10
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Senior Member
Join Date: Apr 2015
Posts: 412
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The trick is to run the largest ga cord you can and then adapt it to a 15/20amp plug right at the house outlet. A 10ga cord is good for about 30amps so would be perfect, even for a long run.
I have a dedicated 50amp RV outlet at my house but to just keep the batterys charged and run a few small things the 15/20amp adapter plugged into a standard house outlet will be fine.
__________________
2022 Entegra Vision XL 36C
2015 Gateway 3650BH (sold)
2005 F250 CC 4x4
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