Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 16-08-2011, 11:54   #1
Registered User
 
SV Demeter's Avatar

Join Date: Dec 2009
Location: Cruising Eastern Caribbean
Boat: Wauquiez Amphitrite 43- Demeter
Posts: 1,164
Are All MC-4 Connectors 12 Gauge ?

With my solar install I am going to use MC-4 cables and will likely buy an extension set to get from the panels to the controller. Im concerned about voltage drop. All the MC-4 cable extensions I have been looking at seem to be 12 gauge wire. I will have (4) 100 watt panels. (2) on each side of the boat. The run from the strbd side panels to the controller im estimating at 18', one way so 36' round trip. Im thinking I would be better off with 10 or even 8 gauge wire? So should I just use the MC-4 cables to get me through the deck and then step up the wire to 8 gauge or are there heavier gauge MC-4 cables available? The run on the port side to the controller should not be more than 10' round trip so I guess 12 gauge would be fine there?
__________________

__________________
SV Demeter is offline   Reply With Quote
Old 17-08-2011, 10:11   #2
Registered User
 
Islander's Avatar

Join Date: Jan 2008
Posts: 166
Re: Are All MC-4 Connectors 12 Gauge ?

I just cut a 50' MC-4 extension cable in 2 to run from the panel to the controller. I'm seeing anywhere from 27 to 34 volts at the controller. I run 6 gauge from the controller to the 12 volt batteries 4' away with no voltage drop - this is where you need the bigger wire. I'm using MPPT, if you're using PWM you might need to do something different?

Cheers
__________________

__________________
Islander is offline   Reply With Quote
Old 17-08-2011, 10:30   #3
Senior Cruiser

Cruisers Forum Supporter

Join Date: Jul 2006
Location: Chesapeake Region and Maine
Boat: 42' Bob Perry sloop
Posts: 4,038
Images: 4
Re: Are All MC-4 Connectors 12 Gauge ?

If you run the panels in series instead of parallel, and you have a good MPPT controller, then for a given wire size there will be less voltage drop and more efficient charging under most conditions.

Bill
__________________
btrayfors is offline   Reply With Quote
Old 17-08-2011, 11:12   #4
Registered User
 
SV Demeter's Avatar

Join Date: Dec 2009
Location: Cruising Eastern Caribbean
Boat: Wauquiez Amphitrite 43- Demeter
Posts: 1,164
Re: Are All MC-4 Connectors 12 Gauge ?

So it sounds like all MC-4 cables are in fact only 12 gauge then. I will likely be running a series parrallel configuration so the voltage on the pair should be something like 36-40 volts. I will be using an Outback Flexmax 60 charge controller which is MPPT so perhaps there is no need for me to be concerned with voltage drop here?
__________________
SV Demeter is offline   Reply With Quote
Old 17-08-2011, 11:20   #5
Registered User
 
Cotemar's Avatar

Join Date: Dec 2007
Boat: FP, Helia 44 Evo
Posts: 5,717
Re: Are All MC-4 Connectors 12 Gauge ?

SV Demeter,

You can buy the MC4 connectors in either 10 or 12 gauge.

MC4 Connector

Solar Panels and Associated Systems

Solar Panels and Associated Systems

Mark
__________________
Cotemar is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
VDO Water Gauge - Help Captain Bill Electrical: Batteries, Generators & Solar 13 14-07-2011 07:37
Testing instruments tom4754 Construction, Maintenance & Refit 3 07-07-2011 16:13



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 19:17.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.