Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 03-01-2012, 17:40   #1
Registered User

Join Date: Nov 2011
Location: Bellingham Washington
Boat: Fraser 41
Posts: 4
Solar Panel Wiring

Hi,
I was wondering if someone out there might be able to help me with a question regarding parallel wiring of solar panels. I have 2 Siemens 75 watt panels on my boat now wired in parallel going to a 25 amp charge controller. I recently acquired a Siemens 50 watt panel and would like to wire this in parralel with the 2 75 watt panels. Can this be done or do I need to wire the 50 watt panel in seperate from the other two? I would prefer not to install another set of wires if I do not need to. Thanks for your help.
Kevin
__________________

__________________
Kist is offline   Reply With Quote
Old 03-01-2012, 18:19   #2
Registered User
 
mikefossl's Avatar

Join Date: Aug 2008
Location: Hawaii
Boat: CS 40
Posts: 171
Re: Solar Panel Wiring

It would depend on the voltage of the panels involved. 12v panels have different actual open circuit voltages which should be close to be used in parallel. Personally I like the idea of using identical panel sets, each going to their own charge controller but I'm no expert.
__________________

__________________
Michael Fössl
S/V Second Jump
British Columbia
mikefossl is offline   Reply With Quote
Old 03-01-2012, 18:21   #3
cruiser

Join Date: Sep 2007
Location: Tampa to New York
Boat: Morgan 33 OutIsland, Magic and 33' offshore scott design "Cutting Edge"
Posts: 1,594
Re: Solar Panel Wiring

I have 2 180 watt panels wired in parallel with four 75 watt panels. just have a diode on each. dont see a problem
__________________
forsailbyowner is offline   Reply With Quote
Old 03-01-2012, 18:26   #4
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 5,834
Re: Solar Panel Wiring

As previously stated, as long as the open circuit voltage ratings are reasonably similar, no problem wiring them in parallel.
__________________
Memento,homo, quia pulvis es, et in pulverem reverteris.
senormechanico is offline   Reply With Quote
Old 03-01-2012, 18:43   #5
CF Adviser
 
Bash's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: sausalito
Boat: 14 meter sloop
Posts: 7,260
Re: Solar Panel Wiring

I've done it without problems. While you can get by with it when the voltages are similar, identical panels are more idea.
__________________
cruising is entirely about showing up--in boat shoes.
Bash is offline   Reply With Quote
Old 03-01-2012, 18:55   #6
Do… or do not
 
s/v Jedi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 9,198
Re: Solar Panel Wiring

I would assume that the wiring in place now is too small to add the extra amps from the new panel. So you probably need to either replace it with larger diameter wire, or add separate wiring for the new panel.

cheers,
Nick.
__________________
s/v Jedi is offline   Reply With Quote
Old 04-01-2012, 07:25   #7
Registered User

Join Date: Nov 2011
Location: Bellingham Washington
Boat: Fraser 41
Posts: 4
Re: Solar Panel Wiring

Thanks for the information everybody. It sounds like wiring them all in parallel is not the most effecient way of doing it but it will work and that is what I was wondering. I think the 10 gauge wiring I installed for the 2 75 watt panels will be big enough to handle the amperage from all three panels. The output of the 50 watt panel is only 3 amps. Again thanks for all the help.
Kevin
__________________

__________________
Kist is offline   Reply With Quote
Reply

Tags
solar, wiring

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
Solar Panels - Series or Parallel ? noelex 77 Electrical: Batteries, Generators & Solar 180 13-08-2016 02:48
Solar Panel: Too Big ? Velocir Electrical: Batteries, Generators & Solar 58 02-01-2012 09:18
Solar Panel GRID Connection Help cat man do Electrical: Batteries, Generators & Solar 11 28-11-2011 15:32



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 11:47.


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.