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Discussion Starter · #1 ·
I just put 4x Renogy 100W panels on my roof. I used various VanTech components to mount them. I’ll post complete photos when it is all going. I have four 8ga wires from solar panels going into a combiner box on my roof. The 4 wires together have a squarish cross section (see photo). The round gasket in the fitting that will go into the box won’t seal. How do I keep water out?
 

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One option is to combine all the wires on the roof and then run a (heavier) wire set inside.
Which is what we did. However, we avoided those clumsy-looking combining connectors. Instead, we cut the various wires to their required lengths, stripped, soldered and taped.
 

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I went for those clumsy
MC4 connectors engineered to be waterproof and easily disconnected. I also used solar cable pass-through boxes that worked really slick. I felt the DIY cost difference was minimal, especially when it involved the potential for roof leaks.
[ame]https://www.amazon.ca/POWER-GPCEP-Cable-Entry-Plate/dp/B0136USGHY/ref=sr_1_sc_1?ie=UTF8&qid=1519661016&sr=8-1-spell&keywords=gopower+wire[/ame]
 

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I made four smallish holes for my panel wires and used grommets and then a dollop of RV roof sealant atop each. Also hid the holes under the panels so the wires could never be exposed to the sun. I know what damage UV does over time.
 

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Discussion Starter · #8 ·
Thank you everyone. Dicor is what I expected to hear.

I used the MC4 combiners to connect 2 sets of 2 panels which gave me 4 wires. I'm connecting everything in parallel and I want to be able to add more panels if I ever need them. I also want as few holes in the roof as possible so I'm using the rooftop combiner box. As I'm married to the combiner box for various reasons, I will use Dicor. My todo list for today already included buying it so I guess I'll be set. I have to be done by Thursday so I have 2.5 days for wiring, which should be fine.

I will post photos when I have solar electricity.


Most of us use grommets made to seal one wire and would buy 4.
https://www.amazon.com/uxcell-Water...TF8&qid=1519648162&sr=1-9&keywords=wire+gland
If you are committed to doing what you have started then silicone, or better Dicor, good luck.
https://www.amazon.com/Dicor-Non-Le...rd_wg=Ns36N&psc=1&refRID=JSTKDAW7ZD94KXKN7QMY
 

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Most of us use grommets made to seal one wire and would buy 4.
https://www.amazon.com/uxcell-Water...TF8&qid=1519648162&sr=1-9&keywords=wire+gland
If you are committed to doing what you have started then silicone, or better Dicor, good luck.
https://www.amazon.com/Dicor-Non-Le...rd_wg=Ns36N&psc=1&refRID=JSTKDAW7ZD94KXKN7QMY
Just a heads up to anyone using a waterproof adjustable weathertight wire fitting: you must use a circular wire to get a weathertight fitting (not standard duplex wire). For example, AM solar sells 10/2 round roof wire that has a synthetic filler that results in a round outer sheath. This allows the use of a weathertight fitting to get fully weathertight. RD, I'm sure you know this, I just thought I'd post it for others to see.
 
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