Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 08-05-2013, 11:48   #46
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: Sailboat Solar Panel Sizing

Increasing temperature will reduce solar panel output, but usually increased insolation in the summer periods will more than make up for this. The average output is generally highest in summer. There are exceptions in tropical areas, but this is more due to cloud build up in summer, rather than a temperature increase.

If you are looking for the highest instantaneous output this is not usually in summer. Cooler temperatures where the sun peaks out from a cloud in the "shoulder season" will generally produce the highest peak output (sometimes exceeding the STC output), but it is short lived and has little practical impact on the total output, which is more important to most cruisers.
__________________

__________________
noelex 77 is offline   Reply With Quote
Old 08-05-2013, 12:15   #47
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
Quote:
Originally Posted by noelex 77 View Post
Increasing temperature will reduce solar panel output, but usually increased insolation in the summer periods will more than make up for this. The average output is generally highest in summer. There are exceptions in tropical areas.

If you are looking for the highest instantaneous output this is not usually in summer. Cooler temperatures where the sun peaks out from a cloud in the "shoulder season" will generally produce the highest peak output (sometimes exceeding the STC output), but it is short lived and has little practical impact on the total output, which is more important to most cruisers.
Thank you Noelex: this is the first old fashioned correct post I read today. Summer, more output; winter, surprisingly good because of cooler climate which is positive for panel efficiency and decreased fridge and freezer consumption. So, even though winter solar production is lower, effect aboard is minimal because consumption is also lower. I have never seen figures of higher avg production for the winter but guess there will always be exceptions.
__________________

__________________
s/v Jedi is offline   Reply With Quote
Old 08-05-2013, 16:51   #48
Moderator
 
sailorchic34's Avatar

Cruisers Forum Supporter

Join Date: Feb 2011
Location: SF Bay Area
Boat: Islander 34
Posts: 4,815
Re: Sailboat Solar Panel Sizing

Quote:
Originally Posted by s/v Jedi View Post
Thank you Noelex: this is the first old fashioned correct post I read today. Summer, more output; winter, surprisingly good because of cooler climate which is positive for panel efficiency and decreased fridge and freezer consumption. So, even though winter solar production is lower, effect aboard is minimal because consumption is also lower. I have never seen figures of higher avg production for the winter but guess there will always be exceptions.
Oh agree completely with Noelex as he said basically the same thing I said. But I'm thinking we can all agree that panel output in volts is higher in lower temps and somewhat lower with higher temps. On the order of ~1V per 20 degrees f rise above 68 degrees F. So a cool summer day panel output will be higher then on a hot summer day. Its just science after all...
__________________

__________________
sailorchic34 is offline   Reply With Quote
Reply

Tags
sailboat, 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




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 16:25.


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.