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Open Roads Forum  >  Tech Issues

 > Solar Panel, Unmarked Pigtails, which is Positive, Negative?

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drsteve

Michigan

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Joined: 06/09/2006

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Posted: 01/09/20 11:08am Link  |  Quote  |  Print  |  Notify Moderator

crcr wrote:

I have another related question and since it is about the mounting of solar panels on an RV roof, I will ask it in this thread rather than start a new thread.

I have stainless steel hardware to fasten the solar panels to my RV roof. Since stainless steel is known to sometimes gall, would it be wise to use a little bit of Anti-Seize on the SS nuts and bolts when assembling them? The pic below is of some copper-based anti-seize that I happen to have.

[image]


On an RV, I'd be more concerned about fasteners coming loose.


2006 Silverado 1500HD Crew Cab 2WD 6.0L 3.73 8600 GVWR
2018 Coachmen Catalina Legacy Edition 223RBS
1991 Palomino Filly PUP

crcr

US

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Posted: 01/09/20 03:36pm Link  |  Quote  |  Print  |  Notify Moderator

crcr wrote:

BFL13 wrote:

crcr wrote:

Thanks to Everyone for your prompt responses! Much appreciated. I will take the panels into the sun today and use a volt meter to verify that the MC4 connector with the red ring is positive.


The OP must have got sun-stroke and zapped himself as well, or we would have heard back by now how that went. [emoticon]


LOL, no sun stroke. I got a chance to test one of my three Renogy panels, and as expected by my many helpful friends on this forum, the pigtail with the red band is in fact, the positive lead. As is wont to happen, life then intervened and I didn't get a chance to test the other two panels. Most likely the polarity is the same on those as the first panel, but just to be thorough, I will test the other two panels tomorrow and report back.


Follow-up: I did test the 2nd and 3rd panels of the same brand (Renogy) today, and the MC4 connector with the red ring is the positive pigtail on all three solar panels.

Thanks again, everyone, for your helpful responses. Much appreciated!

naturist

Lynchburg, VA

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Posted: 01/12/20 04:05pm Link  |  Quote  |  Print  |  Notify Moderator

BFL13 wrote:

naturist wrote:

You will note that they have MC4 connectors on them. Those connectors are one male, the other female. It is impossible to connect them wrong because of the MC4 connectors. That is why they are there in the first place. But also, a VOM will confirm they are wired correctly.


If you use the clips as I linked above, and put them on the wrong wires going to the controller, you can end up with them reversed. Those little monsters take a bit of figuring out. [emoticon]

Once they are on you can't get them off either. The pin grabbers mean once in, they stay in. It is an IQ test. If you fail the IQ test you buy more clips!


Funny, I've had no trouble distinguishing the male from the female MC4 connectors, nor for that matter, taking them apart after once putting them together. All you have to do is squeeze at the right spot, and they come right apart.

As for at the controller, when you make your own connectors, you certainly can put the wrong MC4 gender plug on there. One must certainly pay attention. But I defy you to plug two males or two females together. Homosexuality just isn't a thing with MC4 connectors.





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