Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 10-11-2014, 15:07   #1
Registered User
Dod42's Avatar

Join Date: Nov 2012
Location: Brisbane Australia
Boat: Fountaine Lipari 41 Evolution
Posts: 306
Multiple V Single Controller

I'm about to fit some new solar panels and a Wind generator to my existing system and I'm confused on the bast way to go.

I currently have 4 x 110 watt panels into a 30amp MPPT controller.

I'm intending to fit a D400 which has it's own controller and dump resistors.

I also have 2 x 275 watt panels I intend to add as well.

My initial thoughts are
Leave the existing panels and controller alone.

Install the D400 on it's own controller

Get 2 x 20 amp controllers and put each new panel on its own controller as 20 amp controllers are cheap, it gives me redundancy, if one panel is shaded the
then the other is still ok.

So here is where I get confused. Can multiple controllers co-exist? Would one controller sense the higher charge voltage being put in by one controller and then think that the battery is charged to a higher level than it is, and then effectively either switch off or go float?

How do I set it up so all controllers put in the maximum they can without getting confused by the other controllers, or do I have to go to one big mother of a controller? Is there some sort of sense diode I have to put in between the controllers?

Dod42 is offline   Reply With Quote
Old 10-11-2014, 15:32   #2
Registered User
Dsanduril's Avatar

Join Date: Aug 2011
Location: Oakland
Boat: Cross 40
Posts: 1,393
Re: Multiple V Single Controller

Multiple controllers are better (IMO) for just the reasons you state, if one panel is shaded it won't affect the control function of the other controllers.

Multiple controllers will work fine together. Properly installed they are sensing the voltage at the battery terminals and will control to that voltage. Doesn't really matter how many you have, they'll all control to their set voltage. One caveat, you do want them set to the same voltage, or have a specific plan for how they are staged. If you have one or more controllers set to lower voltages then the equipment on those controllers will stop charging sooner. Maybe that's OK, maybe not, depends on how you have things configured, how close to full your batteries are when the first controller drops out, and whether you are then losing any valuable charging.
Dsanduril is offline   Reply With Quote


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
Wiring Single Pole Single Throw (SPST) Rocker Switch with Light Patrick_DeepPlaya Marine Electronics 17 14-05-2011 19:42
Multiple Batteries, Multiple Banks, Single Charger dakno Electrical: Batteries, Generators & Solar 3 06-06-2010 10:45
Multiple Trips to the Bahamas within Twelve Months freedbill Rules of the Road, Regulations & Red Tape 15 28-07-2006 09:01
Multiple GPS readers Strygaldwir Marine Electronics 5 25-10-2005 05:57

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 20:54.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.