Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 05-05-2014, 11:05   #1
Registered User
 
Atraxia's Avatar

Join Date: Nov 2008
Location: Going to spend a few seasons in the Med, now in the Canary's
Boat: Mikelson 51, a Becker 27 for summers in Sweden and a Dutch Tjalk from 1909 we call home
Posts: 141
Send a message via Yahoo to Atraxia
Solar puzzled

After connecting my new 250w (x2) solar panels through their MPPT controllers to the batteries (as usually instructed) I get everything but charge.
The controllers show that the batteries are being charged and even go through the 3 stage sequence of Bulk, Accept and Float. My Xantrex 2000 panel shows the voltage is there but not the Amps. The battery hours continue to drop.
The batteries are actually continuing to discharge while being charged by the solar panels. This does not happen when running the motor. The Xantrex panel shows the Amps are coming in and battery hours increasing.
Another issue is the solar controllers heat up extensively when the sun is up and beating.

Any thoughts, recommendations, solutions will be most appreciated.
Thanks
Ron
__________________

__________________
To live your dream, you must first wake up.
Our blog: sailatraxia.com (English)
atraxia.se (Swedish)
Atraxia is offline   Reply With Quote
Old 05-05-2014, 12:22   #2
Senior Cruiser
 
Lancerbye's Avatar

Cruisers Forum Supporter

Join Date: Mar 2007
Location: Ladysmith,BC, Vancouver Island , Canada
Boat: Lancer 44 Motorsailer
Posts: 1,758
Images: 32
Re: Solar puzzled

I suspect that you do not have the charging information from your solar panels and controller going to the Xantrex 2000, so the Xantrex only reads the normal output current which is fed back to it via a shunt. Do you have the controller output going directly to the battery?
__________________

__________________
The basis of accomplishment is in never quitting
Mengzi Meng-tse
Lancerbye is online now   Reply With Quote
Old 05-05-2014, 12:50   #3
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: Living on dirt waiting for our new yacht to be built.
Boat: Half built Bestevaer.
Posts: 10,619
Re: Solar puzzled

Quote:
Originally Posted by Lancerbye View Post
I suspect that you do not have the charging information from your solar panels and controller going to the Xantrex 2000, so the Xantrex only reads the normal output current which is fed back to it via a shunt.
+1
If the volts are rising when the solar is outputting then the solar output is likely to fine.
Moving the solar controllers output from the battery to the shunt side of the batter monitor should solve the problem.
__________________
noelex 77 is offline   Reply With Quote
Old 05-05-2014, 15:56   #4
Registered User

Join Date: Oct 2010
Location: Blue Mountain Ont
Boat: Beneteau Oceanis 400 40 ft "Camp David
Posts: 402
Re: Solar puzzled

It does not matter where the + connection is located, be it the battery or at the panel, it is all about where the - negative is connected to the system.

It must connected above the shunt so that the current passes thru the shunt and then to the battery. The shunt is on the negative side of the battery circuit, there should no wires connected between the shunt and the battery other than the cable. all curcuits should be above the shunt.

Fletch
__________________
CampDavid is offline   Reply With Quote
Old 05-05-2014, 17:33   #5
Registered User

Join Date: Jun 2013
Location: canada
Posts: 1,700
Re: Solar puzzled

if you have lots of stuff on (lights, etc) you might still be neg with the panels. but I would check the shunt. make sure everything is turned off to confirm you have charging amps.
__________________
smac999 is offline   Reply With Quote
Old 07-05-2014, 12:38   #6
Registered User
 
Atraxia's Avatar

Join Date: Nov 2008
Location: Going to spend a few seasons in the Med, now in the Canary's
Boat: Mikelson 51, a Becker 27 for summers in Sweden and a Dutch Tjalk from 1909 we call home
Posts: 141
Send a message via Yahoo to Atraxia
Re: Solar puzzled

Thank you all for your replies!

I just changed the connection from directly to the battery to the main bus and it reads fine.
Now just remains the question why do the controllers heat up so much?
I have never encountered hot controllers before.
__________________
To live your dream, you must first wake up.
Our blog: sailatraxia.com (English)
atraxia.se (Swedish)
Atraxia is offline   Reply With Quote
Old 07-05-2014, 13:37   #7
Registered User

Join Date: Dec 2008
Location: Oriental, NC
Boat: Mainship Pilot 34
Posts: 1,429
Re: Solar puzzled

MPPT controllers have about 5% power losses in their circuitry. With as much as 250 watts going to them, 12.5 watts will be converted to heat. That is the same or more than a typical incandescent dome light. Feel how hot one of these gets and compare.

David
__________________

__________________
djmarchand is offline   Reply With Quote
Reply

Tags
solar

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
Puzzled? sailmaker-china Meets & Greets 7 26-04-2010 21:38
Emergency crews puzzled by yacht find Yacht Lead sneuman Health, Safety & Related Gear 76 08-10-2008 10:02
Lost steerage way, puzzled rsn48 Seamanship & Boat Handling 5 04-09-2007 21:30



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:00.


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.