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30-09-2013, 08:39
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#1
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Registered User
Join Date: Jun 2010
Location: Lying La Paz, BCS
Boat: 1991 Californian 52CPMY
Posts: 401
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Solar PV Cables Through Deck
Hi all,
I have 3 24v 175w solar panels on my arch. They will feed a Morningstar 60 controller. I am going to run separate wires for each panel and need to go through the deck. Can I bunch the wires into one large bundle and only use one deck fitting gland? How about two sets of three wires? Even at just two wires, they will not be perfectly round, will normal wire glands work for this?
What do all of you do for solar panel wires?
Thanks, Bill
__________________
M/V Ansedonia
'91 Californian 52 CPMY
Lying La Paz, BCS, Mexico
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30-09-2013, 08:43
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#2
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Registered User
Join Date: Oct 2005
Posts: 6,185
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Re: Solar PV Cables Through Deck
Can you put them through the arch tube, and then drill a hole through the deck at the arch tube base?
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30-09-2013, 09:09
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#3
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Registered User
Join Date: Jan 2005
Location: On board
Boat: Van de Stadt 50'
Posts: 1,413
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Re: Solar PV Cables Through Deck
What is the max voltage of the regulator? Our panels are wired in series, only 2 wires come into the boat. On 3 24v Panels you must work on the max voltage, ie 90something. Alternatively wire them in Parl, but choose a pair big enough to bring them all to the reg on 2 wires.
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30-09-2013, 17:42
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#4
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Moderator Emeritus

Join Date: Sep 2006
Posts: 4,663
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Re: Solar PV Cables Through Deck
I have run irregular cables / wires through the Blue Sea deck gland, and if you cut the hole to match the wires it seals up pretty tight:

A bit of lanocote or caulking wouldn't hurt though.
__________________
Paul Elliott, S/V VALIS - Pacific Seacraft 44 #16 - Friday Harbor, WA
www.sailvalis.com
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30-09-2013, 17:55
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#5
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Registered User
Join Date: Feb 2007
Location: Southwestern Yacht Club, San Diego, CA
Boat: Searunner 40 trimaran, WILDERNESS
Posts: 3,175
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Re: Solar PV Cables Through Deck
You can also use flexible conduit and watertight glands in the deck. Remember, water isn't the only problem. Ultraviolet light is constantly attacking the insulation of the conductors. Having a sacrificial barrier means that the conduit eventually bubbles and "burns", not the more expensive wire cable. The grey color is pretty neutral and industrial, and you can utilize weather-tight boxes for junctions.
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30-09-2013, 18:00
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#6
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Registered User
Join Date: May 2007
Location: On the hard due to wife's medical condition.
Boat: Sold, alas, because life happens.
Posts: 1,829
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Re: Solar PV Cables Through Deck
Deck fitting, sealed with 3M 4000 (the UV resistant stuff). That's if you absolutely need to have the wires on the outside of the arch.
We ran our leads (4 sets of 2 wires, AWG 12 each) through an arch leg into the lazarette, thence soldered to AWG 6 duplex for the long run to the controller.
__________________
"Being offended is not the same thing as being right." Dave Barry.
Laughter is the salve that keeps reality from scaring.
¯\_(ツ)_/¯
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01-10-2013, 02:14
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#7
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Registered User
Join Date: Mar 2009
Location: Australia, Hervey Bay QLD
Boat: Boden 36 Triple chine long keel steel, named Nekeyah
Posts: 909
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Re: Solar PV Cables Through Deck
Instead of using special purpose glands, I use a standard plastic thru hull that has a hose tail. Mount it upside down so the tail is sticking up. Use a short length of hose bent in a gooseneck after you have threaded the cables through and you have waterproof thru deck. If you want to be doubly sure, squeeze a little sealant into the very end of the hose.
Very cheap and effective.
Regards,
Richard.
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01-10-2013, 07:22
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#8
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Registered User
Join Date: Aug 2009
Location: between the devil and the deep blue sea
Boat: a sailing boat
Posts: 21,188
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Re: Solar PV Cables Through Deck
I went thru the cockpit coaming - this is somewhat above the deck and so no rain water and no green water there. I bundled the negs together (2x) and positive wires went thru another hole. Just in case.
Metal/rubber squeeze glands work fine and if any gap left you can fill it with a sealant.
b.
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