What is this 20amp 4pin for? - Fiberglass RV


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Old 04-16-2014, 11:40 AM   #1
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What is this 20amp 4pin for?

So I am the proud new owner of a 2007 Casita 17SD. This was purchased from a dealer as a trade in. The prior owner made this modification, and nobody knows what for.

Any ideas what this 20amp 4pin could do? It is wired into the inverter.
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Old 04-16-2014, 11:44 AM   #2
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What does it look like inside that access panel?
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Old 04-16-2014, 11:45 AM   #3
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It's just a wire that runs to the inverter panel on the inside of the trailer.
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Old 04-16-2014, 11:46 AM   #4
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Looks like he converted the trailer to a removable 120vAC cord and stuck that 4 prong plug into the door. Are you sure it's connected to an inverter and not the converter?

The "normal" panel in there is a converter. An inverter would be added on somehow.
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Old 04-16-2014, 11:47 AM   #5
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I would guess, (I stress GUESS) it is 120 VAC from the inverter. PO probably had an extension cord that ended in a regular plug on the far end.
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Old 04-16-2014, 11:49 AM   #6
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Quote:
Originally Posted by David Tilston View Post
I would guess, (I stress GUESS) it is 120 VAC from the inverter. PO probably had an extension cord that ended in a regular plug on the far end.
If you're right, that's kind of a dangerous plug on the trailer. Plug the female end of a normal extension cord in there and you'd have a "hot" male plug at the other end. Or an extension cord with two female ends I suppose.

Kind of makes me wonder, if it's to an inverter, why the previous owner didn't just put an exterior outlet box nearby.
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Old 04-16-2014, 11:54 AM   #7
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I use the exact same connector for my portable solar panels, but it's wired directly to the battery on a 12 inch run. Mine is mounted on my frame.

Perhaps it is tapped into the battery charge line from the convertor? It's not the best way to do it, but it would work.

If you have a voltmeter and know how to use it, I would measure the output of the pins on a dc scale first to see if you get 12v at any combo. If not, plug the rig in and see if there is AC there. If there is..glue the lid shut, or better yet..rip the whole thing out if you have the skills.
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Old 04-16-2014, 11:55 AM   #8
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It looks like the wires run to the fuse panel, with 1 wire running to a 20 amp fuse, and the other running to the battery negative connection.
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Old 04-16-2014, 12:00 PM   #9
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Originally Posted by Gina D. View Post
I use the exact same connector for my portable solar panels, but it's wired directly to the battery on a 12 inch run. Mine is mounted on my frame.

Perhaps it is tapped into the battery charge line from the convertor? It's not the best way to do it, but it would work.
Thanks Gina, I thought it might be solar. What panels are you using? And I am not sure I understand what you mean by mounting on the frame? Are you just referring to a different mounting location for the connection, or is this a bad wiring set up?
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Old 04-16-2014, 12:03 PM   #10
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I would say Solar hookup.
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Old 04-16-2014, 12:10 PM   #11
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Which panels come with a proper connection for that? Or do I still need to run a controller and everything?
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Old 04-16-2014, 12:11 PM   #12
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My portable panels are Sun. I have 2 50 watt ones "on the ground" and 2 Seimens 75 watt ones on the roof. Both setts have their own controllers which are wired directly to the battery.

Yes, you are correct, the connector and pigtail are whats mounted on the frame. It was easy to make a bracket for that connector (I just used a standard L bracket found in any hardware store) The "ears" on that connector with the existing mounting holes are bolted to one flange of the bracket, the other flange is screwed into an existing hole on the tongue. EZ PZ.
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Old 04-16-2014, 12:16 PM   #13
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Originally Posted by Caseyb476 View Post
Which panels come with a proper connection for that? Or do I still need to run a controller and everything?
Yes, you will need a controller for any panel over 15 watts. As far as the connections, "Kit" panels (Like harbor freight) usually come with some cheesy 2 pin auto style connector, others come with none at all..you make your own or your installer does.

Before you jump through those hoops tho, measure the pins on the connector electrically...you need to determine just WHAT it is..tho I am 90% sure it's 12v.

I have come across so many misguided owner mods that I kinda refuse to say for sure. It's running directly to a fuse is odd for solar..maybe it was set up for the output of a generator for battery charging. A fuse would be appropriate for that.
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Old 04-16-2014, 12:17 PM   #14
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I haven’t had much use for solar power so that option never occurred to me. But if forced to think about it, it makes sense to have the live dc current carrying cable from the panels to be safely recessed in a female plug end. You wouldn’t want the cable flopping around shorting out on something before you plug it in. That requires the trailer battery side to be male.

I'm probably stating the obvious...
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