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Old 02-20-2019, 04:16 PM   #21
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Quote:
Originally Posted by cedonly View Post
Check out the power over Ethernet (cat5) specs:
https://en.m.wikipedia.org/wiki/Powe...ds_development
Thanks.

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Originally Posted by Magnet18 View Post
I'd use it with a 1A fuse without a single worry

Usb 5v 2.1 amp isn't the same current you'll see at the 12V feed, a cheap 70% efficiency converter would pull .76A , so stick a 1A fuse on the cat5 cable and move on
I discovered the wire is actually 24ga. I will try a 1A fuse and maybe go to a 2A tops.

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Originally Posted by gcarter View Post
I see no problem. In fact you could run only +12 thru the cable and tie ground to the chassis.
I thought about that too. My usb outlet comes in tomorrow from Amazon.
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Old 02-21-2019, 11:28 AM   #22
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I used the old cat 5 wires for the sun explorer to power the Victron BMV.
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Old 02-21-2019, 01:20 PM   #23
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Originally Posted by mythbuster88 View Post
I used the old cat 5 wires for the sun explorer to power the Victron BMV.

That's one thing I wanted to do. But their monitors are pricey and with bluetooth built into the Victron controllers now, I decided to re-purpose the wire for a an additional USB since in '2012 Airstream did not install them in their Avenue class "b's".
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Old 02-21-2019, 01:56 PM   #24
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I suppose by now the decision has already been made to do it or not do it. We called this stuff "JK" or "Jake" which stood for "Jacketed wire" plus 4 conductor or 2 pair depending on what the color coding and if it was twisted or not... red-green-yellow-black or white and blue pairs. Most of what we used was 24 gauge. What its doing or used for determines the RJ designation. 2 pair could be CAT3... 4 conductor isn't CAT anything. Bottom line, doubling up conductors so you can have 2 conductors + and then 2 (-) would result in about a 4% voltage drop for 12vdc at 1 amp with a single run of 12 feet. You could cut that VD to 2% if you could find a ground near the "plug" and use all 4 conductors for +. I would fuse it for 2 amps and go for it.

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Old 03-13-2019, 10:44 PM   #25
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Followup on my original post:

It turned out the CAT5 was 24ga and not 26ga as I originally thought. Therefore, I proceeded with using 4 wires for the positive and 4 for the negative with a 1A in-line fuse from the Victron Solar Controller "Load".

I love the Victron for program-ability and monitoring.

It turns out the USB outlet from Amazon is a 2.1A not a 1A. I was worried it might stress the wiring, but as someone pointed out, at 5 volts, the amps would not be that much and they were right. I just plugged in my phone and the Victron shows only a .4A load. I'm happy with result.

Thanks to all who took the time to offer advice. That's why I love this forum.
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