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Old 12-09-2017, 07:59 PM   #1
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Portable solar panel and wire length to trailer

Is there a loss of charging amps related to the length of the wire from a portable panel to the trailer? I currently have a 15' wire from panel to zamp port. Today I got an extension piece of 15' in the event the sun is further out than 15' from the trailer. Just curious about loss of charging related to length of wire.
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Old 12-09-2017, 08:26 PM   #2
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Negligible in the scheme of things.
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Old 12-09-2017, 08:32 PM   #3
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What gauge is the wire?
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Old 12-09-2017, 08:45 PM   #4
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I agree - if the sun is hiding from the roof panel than any charging juice from a portable panel is welcomed.


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Negligible in the scheme of things.
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Old 12-09-2017, 08:46 PM   #5
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14 guage

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What gauge is the wire?
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Old 12-09-2017, 09:11 PM   #6
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Getting your panel into the sun will gain more than what is lost in your 14g wire.
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Old 12-09-2017, 09:13 PM   #7
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Thanks!
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Old 12-09-2017, 09:29 PM   #8
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Quote:
Originally Posted by parfsten View Post
Is there a loss of charging amps related to the length of the wire from a portable panel to the trailer? I currently have a 15' wire from panel to zamp port. Today I got an extension piece of 15' in the event the sun is further out than 15' from the trailer. Just curious about loss of charging related to length of wire.
Hi Parfsten,
You may want to consider performing a simple field test. @ noon measure your amp coming into your solar controller from your roof mounted solar panel. Then plug in your portable panel with 15' cable and write it down (try and aim portable panel directly at the sun). Then do the same with the additional 15' cable. Pretty simple and should give you a ball park idea. If I were to guess hum ? 4.5 amps.
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Old 12-09-2017, 10:11 PM   #9
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Originally Posted by parfsten View Post
14 guage
Read the blog "The Battery Charging Puzzle" by Handyman Bob before you think 14 gauge is good enough. I run a 40 foot 6 gauge duplex silicone wire and have minnimum voltage drop. There are plenty of voltage drop calculators available to use. Voltage drop is your enemy in a solar system. Renogy a popular solar retailer has a calculator at https://www.renogy.com/calculators/
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Old 12-10-2017, 11:58 AM   #10
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My solution: I carry a 50’ 10 gauge extension cord from Harbor Freight with pigtails to connect to the portable solar panel on one end and my Zamp Solar plug on the Escape.

Oh, and it is also an extension cord.


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