Reply
 
Thread Tools Search this Thread Display Modes
 
Old 12-19-2014, 09:16 PM   #15
4 Rivet Member
 
Currently Looking...
ottawa (greely) , Ontario
Join Date: Feb 2012
Posts: 390
Blog Entries: 1
Quote:
Originally Posted by dznf0g View Post
Sounds like the 80W Go Pro comes with a large enough capacity controller for 240 watts. You can add as many as you want, with proper wiring and a larger capacity controller....within reason.

Go power. 80 watt and 120 watt portable folding panels have a 10 amp charge controller .so the maximum wattage would be somewere around 135 watts of solar panel.

Don
__________________

__________________
2012 silverado ext cab 4x4 ,5.3 L , 6 speed trans,3:42 final drive,tow package standard box 6 1/2 foot . 2014 honda forza 300 scooter, #2 2015 honda crf 250 L (Dual sport)
scamp is offline   Reply With Quote
Old 12-20-2014, 08:26 AM   #16
Rivet Master
 
dznf0g's Avatar

 
2007 30' Classic
Oswego , Illinois
Join Date: Jul 2010
Posts: 9,410
Images: 5
Quote:
Originally Posted by scamp View Post
Go power. 80 watt and 120 watt portable folding panels have a 10 amp charge controller .so the maximum wattage would be somewere around 135 watts of solar panel.

Don
So when they say up to two more can be added, they must require a different controller?
__________________

__________________
-Rich-

"If the women don't find you handsome, they should at least find you handy." - Red Green
dznf0g is offline   Reply With Quote
Old 12-20-2014, 02:18 PM   #17
2 Rivet Member
 
2005 22' International CCD
Cambria , California
Join Date: Dec 2014
Posts: 38
This will sound weird but if you have more than one panel, you should keep the wires at the exact same length. I don't know why but I was told this by several good sources when I put solar on my 22ft CCD. My suggestion to you is that you permanently install the panels and controller and increase the size of the batteries. I have four 80 watt panels attached to the roof, an excellent charge controller and made bigger battery boxes using two Trojan 6 volt high capacity deep cycle batteries in series. We camp for two weeks at a time running the furnace, watching movies and never run out of power unless we are in dense shade. Even then, we just have to conserve a little.
__________________
Ziggy2 is offline   Reply With Quote
Old 12-20-2014, 02:44 PM   #18
Rivet Master
 
mefly2's Avatar
 
2015 25' FB Eddie Bauer
Western , ** Big Sky Country ** Montana
Join Date: Feb 2010
Posts: 2,283
We use a briefcase Goal Zero and a folding Zamp (for sale) together and they seem to charge fine ... maybe I missed something...connect one to the AS batts and one to the TV batts and it appears to charge the AS batts through the umbilical ...
For us and our electrical usage, the two units seem to be overkill in all but the late fall - when we need more batt power for the furnace fan and there is less available sunlight.
__________________
mefly2 is offline   Reply With Quote
Old 12-20-2014, 07:09 PM   #19
Rivet Master
Commercial Member
 
lewster's Avatar
 
Vintage Kin Owner
Naples, FL , Hood River, OR
Join Date: Dec 2005
Posts: 7,282
Quote:
Originally Posted by Ziggy2 View Post
This will sound weird but if you have more than one panel, you should keep the wires at the exact same length. I don't know why but I was told this by several good sources when I put solar on my 22ft CCD. My suggestion to you is that you permanently install the panels and controller and increase the size of the batteries. I have four 80 watt panels attached to the roof, an excellent charge controller and made bigger battery boxes using two Trojan 6 volt high capacity deep cycle batteries in series. We camp for two weeks at a time running the furnace, watching movies and never run out of power unless we are in dense shade. Even then, we just have to conserve a little.
I don't know who your 'good sources' are, but if you are using proper sized cables (we use 10AWG from each cable to a combiner box) and then a sufficiently large cable to carry the voltage to the controller and then the charging current to the batteries, there is no need to use cables of the same size. this is because there is extremely small to no voltage drop measurable in our systems.

I just finished a 12 panel system with 160 watt panels and 3 paralleled charge controllers, and the cable lengths ranged from 15' to 4'. There was no appreciable voltage drop (it was measured in the first set of 4 panels to be virtually identical)....so no reason to use identical sized cables. The system has a 120 amp total charge capacity to the batteries of the motor home.

It might be an issue if you use minimal sized cables where the resistance and voltage drop in the cable runs are appreciable, but we never see this problem.
__________________
Lew Farber...ABYC Certified Master Marine Electrician...RVIA Certified Master Tech ...AM Solar Authorized Installation Center...AIRSTREAM Solar & Electrical Specialist...Micro Air 'Easy Start' Sales and Installations
lewster is offline   Reply With Quote
Old 12-20-2014, 07:25 PM   #20
2 Rivet Member
 
2005 22' International CCD
Cambria , California
Join Date: Dec 2014
Posts: 38
2 Portable Solar Systems

Yes, sounds weird but I talked with either the charge controller people or the Sanyo people and some others and they all concurred that it was optimal for performance to have the cables the same size. I have no idea why and it may make a minimal difference but I thought, it can't hurt.


Sent from my iPhone using Airstream Forums
__________________
Ziggy2 is offline   Reply With Quote
Old 12-20-2014, 07:27 PM   #21
Don't forget your cat nap
 
Ag&Au's Avatar
 
Port Orchard , Washington
Join Date: May 2009
Posts: 4,464
Images: 1
I think the wires need to be the same length, because if they are of unequal length, there is a small but definite chance that the solar karma of the panels could become 180 degrees out of phase. This would cause them to start disliking each other and refuse to work together. At least that's what MY sources said.

Ken
__________________
Ag&Au is offline   Reply With Quote
Old 12-20-2014, 07:32 PM   #22
Don't forget your cat nap
 
Ag&Au's Avatar
 
Port Orchard , Washington
Join Date: May 2009
Posts: 4,464
Images: 1
Quote:
Originally Posted by Ziggy2 View Post
Yes, sounds weird but I talked with either the charge controller people or the Sanyo people and some others and they all concurred that it was optimal for performance to have the cables the same size. I have no idea why and it may make a minimal difference but I thought, it can't hurt.
Sent from my iPhone using Airstream Forums
The key factor here is what does optimal mean. As Lew stated, if the cable is of sufficient diameter, then any deviation from optimal will be infinitesimal. However if it makes you feel better, knock yourself out getting them exact. Just make sure the wires are at the exact same temperature when you measure and cut them.
Ken
__________________
Ag&Au is offline   Reply With Quote
Old 12-20-2014, 07:36 PM   #23
2 Rivet Member
 
2005 22' International CCD
Cambria , California
Join Date: Dec 2014
Posts: 38
Hey, I didn't come up with this. Sites like cleangreenenergyzone.com say things like this " Q: Is the length of the cable important when connecting the solar cells?
A: The cables should be short enough and have the same length." It can't hurt


Sent from my iPhone using Airstream Forums
__________________
Ziggy2 is offline   Reply With Quote
Old 12-20-2014, 07:38 PM   #24
4 Rivet Member
 
Currently Looking...
ottawa (greely) , Ontario
Join Date: Feb 2012
Posts: 390
Blog Entries: 1
Quote:
Originally Posted by dznf0g View Post
So when they say up to two more can be added, they must require a different controller?
If you look at the go power web site under accessories or expansion kits you have to read between the lines because what there saying for expansion is the portable 40,80 or120 watt is the expansion to your already permanent solar panels on your trailer. And all three kits have the same 10 amp charge controller( not the greatest PWM) a much better charge controller would be a mppt charge controller but this would drive the price up, the mppt charge controller would harvest up to 30 % more power out of the same solar panels.

Don
__________________
2012 silverado ext cab 4x4 ,5.3 L , 6 speed trans,3:42 final drive,tow package standard box 6 1/2 foot . 2014 honda forza 300 scooter, #2 2015 honda crf 250 L (Dual sport)
scamp is offline   Reply With Quote
Old 12-20-2014, 07:48 PM   #25
Don't forget your cat nap
 
Ag&Au's Avatar
 
Port Orchard , Washington
Join Date: May 2009
Posts: 4,464
Images: 1
Quote:
Originally Posted by Ziggy2 View Post
Hey, I didn't come up with this. Sites like cleangreenenergyzone.com say things like this " Q: Is the length of the cable important when connecting the solar cells?
A: The cables should be short enough and have the same length." It can't hurt

Sent from my iPhone using Airstream Forums

I'm a sorry, but even after extensive rehab, I am still an incurable smart-ass. I just find it annoying when authorities, such as you quote, give a blanket -one size fits all- answer without explaining what other variables can effect the real answer to a question. For instance, using their apparent emphasis, if the cables were of different diameter then they should be of particular unequal lengths. In your case making the leads the same length may be no big deal. However in a different situation the possible mounting options might make it a PITA to make one wire unnecessarily long just to satisfy their made up equal rule.

Ken
__________________
Ag&Au is offline   Reply With Quote
Old 03-15-2015, 12:42 AM   #26
4 Rivet Member
 
MaineStreamer's Avatar
 
2007 20' Safari
Saco , Maine
Join Date: Sep 2014
Posts: 348
I have been pondering portable solar panels for a few months, reading discussions like those above. At my introductory stage, I just want a suitcase kit that I can connect in the sun in a few minutes. It sounds like several members of this forum have been happy with 80 watts, but it might be most efficient to buy a kit that provides 100, 120 or 160 watts. Assuming that each kit is truly complete, perhaps except for addition of a longer extension cable to allow more flexibility to position the panels in the sunlight, the top choices seem to be:

RenogyⓇ Foldable Solar Suitcase Battery Charger 100W
Buy new: $269.99
3Used & newfrom $269.99

Go Power! GP-PSK-120 120W Portable Folding Solar Kit with 10 Amp Sola…
Buy new: $623.95
13Used & newfrom $543.99


Zamp Solar 160 Watt Portable Ch...Zamp Solar 160 Watt Portable...Zamp Solar 160 Watt Port...
$755.00
Solar DealzSolar

Zamp Solar 160 Watt Portable Charging System $755.00
Solar Dealz
Great for dual-battery banks / moderate users

or
Zamp Solar 120 Watt Portable Ch...Zamp Solar 120 Watt Portable...Zamp Solar 120 Watt Port...
$627.00
Solar DealzSolar

Granted that shopping more websites of additional vendors might shave a few dollars off any particular kit, it seems like a huge jump in price from the Renogy 100W kit at about $270 to 120W kits at approx. $625 or 160W kits at approx. $755. To increase from the Renogy 100W kit to the others more than doubles the price. The kit prices seem to increase exponentially with increased wattage, rather than linearly. Perhaps that is appropriate; I don't know.

Please comment on the "value" and "cost effectiveness" of these comparative solar panel kits. I am a newbie so I don't really know what demands for power I will have, but I just want to get a good value for battery charging capability with easy, non-technical set-up that I can easily carry in the Airstream while driving. It seems like purchase of a Honda EU2000 generator may be a good idea sometime too, but I would prefer to start with solar, so will wait until I have some Airstreaming history before adding a generator, if I ever do.

I welcome any advice and comments.
__________________
Marty Womer
Saco, Maine
MaineStreamer is offline   Reply With Quote
Old 03-15-2015, 10:31 AM   #27
Rivet Master
 
AWCHIEF's Avatar
 
2006 23' Safari SE
Biloxi , Mississippi
Join Date: Nov 2011
Posts: 8,138
Images: 33
The Renogy system listed seems to be one of the better portable set ups on the market. Reviews are overall very good and it has a very competitive price.
__________________
MICHAEL

Do you know what a learning experience is? A learning experience is one of those things that says "You know that thing that you just did? Don't do that."
AWCHIEF is offline   Reply With Quote
Old 03-15-2015, 11:17 AM   #28
Rivet Master
 
gandttimes's Avatar
 
2014 25' FB International
2007 20' Safari SE
2005 19' Safari
Qualicum Beach , British Columbia
Join Date: Jul 2010
Posts: 804
If it has any bearing, I got 3 100W flex panels from Renogy.
The folks there were great to deal with and the panels are working as advertised.
I would have no hesitation in buying there again.


George
__________________

__________________
gandttimes is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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
Portable GPS systems JakBluMule On The Road... 100 05-26-2008 07:58 PM
Cleaning the portable water systems after use Silvertwinkie Fresh Water Systems 4 07-01-2003 04:46 PM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 09:36 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.