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Open Roads Forum  >  Tech Issues

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

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crcr

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Posted: 01/07/20 04:54pm Link  |  Quote  |  Print  |  Notify Moderator

I bought 5 solar panels recently, the pigtails on the two HQST solar panels are marked as to positive and negative, but the pigtails on the three Renogy 100w panels are not marked. On the HQST panels, the pigtail with the red band is positive. Would it be the same on these Renogy panels?

Two pics of the pigtails on the Renogy solar panels. Which is positive and which is negative?


[image]


[image]

GKAbbott

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Posted: 01/07/20 05:05pm Link  |  Quote  |  Print  |  Notify Moderator

Use a VOM to determine polarity.

naturist

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Posted: 01/07/20 05:46pm Link  |  Quote  |  Print  |  Notify Moderator

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.





BFL13

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Posted: 01/07/20 05:46pm Link  |  Quote  |  Print  |  Notify Moderator

This says the male clip goes to the female clip on the negative pigtail

http://www.wegosolar.com/products.php?pr........=MC%252dMALE-MC%252d4-Male-Clip-with-Pin

BUT--I would definitely use my voltmeter on the panel pigtails with the panel in the sunlight to be sure. If meter pos is on panel pos, the voltage shows pos, if reversed the voltage has a minus sign ( - )in front of it on the meter's readout.

This is the female clip that connects to the panel's pos male clip it says.

http://www.wegosolar.com/products.php?pr........252dFEMALE-MC%252d4-Female-Clip-with-Pin

Your panel's male clip is marked red, so that all checks out.

* This post was edited 01/07/20 05:53pm by BFL13 *


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pianotuna

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Posted: 01/07/20 05:52pm Link  |  Quote  |  Print  |  Notify Moderator

Use a multi meter to check the polarity. Note the voltage on all panels.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

Mike134

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Posted: 01/07/20 05:54pm Link  |  Quote  |  Print  |  Notify Moderator

use volt meter if it reads + then the red probe is touching the + wire. If it reads - then the red probe is touching the neg. wire

Boon Docker

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Posted: 01/07/20 06:00pm Link  |  Quote  |  Print  |  Notify Moderator

By looking at the direction of those diodes the pigtail with the red ring is positive.

BFL13

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Posted: 01/07/20 06:03pm Link  |  Quote  |  Print  |  Notify Moderator

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!

JesLookin

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Posted: 01/07/20 06:22pm Link  |  Quote  |  Print  |  Notify Moderator

Boon Docker wrote:

By looking at the direction of those diodes the pigtail with the red ring is positive.

Yes, red ring is positive, because of connection to the diodes.


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Lwiddis

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Posted: 01/07/20 06:27pm Link  |  Quote  |  Print  |  Notify Moderator

So much for Renogy making it simple, clear for the solar newbie.


Winnebago 2101DS TT & 2020 Chevy Silverado 1500 LTZ Z71, 300 watts solar-parallel & MPPT, Trojan T-125s. TALL pole for flags. Prefer USFS, COE, BLM, NPS, TVA, USF&WS, state & county camps. Bicyclist! 14 year Army vet - 11B40 then 11A - (MOS 1542 & 1560)


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