Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 01-04-2010, 21:33   #1
Registered User

Join Date: May 2006
Posts: 463
How to Set Up 3 x 130w 12vdc Solar Panels for 24vdc with the Most Amps ?

How would I best use 3 12v 130w solar panels to get 24v.
I guess that a mppt controller is a must.
Do I set them up in series for maximum volts and let the regulator bring it back to 24v?
Do I set 2 in parallel and the other in series to have less volts but more amps?
Do I set them all in parallel for even less volts but even more amps? (which then raises a question... can an mppt regulator step up the voltage from 12 to 24?)
Or is there an even better way?
Thanks John
__________________

__________________
Fuss is online now   Reply With Quote
Old 01-04-2010, 22:52   #2
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 5,830
Add the panel open circuit voltages to see if the controller can handle the open circuit voltage of the three panels. If so, put them in series.
A series parallel connection will not work unless you have four identical panels.
__________________

__________________
Memento,homo, quia pulvis es, et in pulverem reverteris.
senormechanico is offline   Reply With Quote
Old 02-04-2010, 12:32   #3
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
Yes John, connect in series and match the MPPT controller to handle the 36V nominal input and 24V output.

In addition, you will have to check the "max. open voltage" of the panels, multiply that by 3 (for three panels in series) and check if that is within the spec of the controller. It should, but check it anyway.

ciao!
Nick.
__________________
s/v Jedi is offline   Reply With Quote
Old 06-04-2010, 01:25   #4
Registered User

Join Date: May 2006
Posts: 463
a great link on this subject

Thanks very much Steve and Nick,
The forum is a great place for answers.... and to contribute something myself.... take a look at this from Morningstar.

Here's is a company that understands what questions people have.
A solar panel/ regulator calculator

Morningstar String Calculator
__________________
Fuss is online now   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
24vdc Solar to 12vdc Battery Bank hummingway Electrical: Batteries, Generators & Solar 56 13-09-2011 10:43
Solar Yacht set to go RTW Target9000 Cruising News & Events 7 22-02-2010 13:34
30+ amps from solar panels! schoonerdog Electrical: Batteries, Generators & Solar 34 18-07-2008 00:21
No amps from solar controller Jumbyway Electrical: Batteries, Generators & Solar 5 16-06-2008 07:23
Do You Need Solar Panels? StoutWench Electrical: Batteries, Generators & Solar 3 15-12-2005 21:33



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 22:56.


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.