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07-02-2015, 07:22 PM
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#1
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3 Rivet Member
2018 19' Flying Cloud
Eugene
, Oregon
Join Date: Mar 2015
Posts: 220
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50w Just for charging
I am considering a solar panel setup only to keep my batteries charged when I not using the Airstream (I have two 12v hooked in parallel). It would not be a permanent mounting. Would a 50 w panel be enough to do the job?
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07-02-2015, 08:23 PM
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#2
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Rivet Master
2006 23' Safari SE
Biloxi
, Mississippi
Join Date: Nov 2011
Posts: 8,278
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50 watt panel with perfect all day angle to the sun should give you 4.2 amps. That is in a perfect world, real world will be less than 3 amps average. That might be enough to cover parasite draws but not much else.
__________________
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."
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07-02-2015, 08:28 PM
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#3
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Rivet Master
2002 30' Classic S/O
Fleming Island
, Florida
Join Date: Nov 2013
Posts: 4,673
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Probably....
... depending on the condition of the batteries and shadowing of the panels. If everything in the trailer is turned off ( you may have to make wiring mods to turn off the propane detector if you have one), self discharge would only be a few hundred milliamps per battery. Good batteries would probably be around 100. So 200 mA times 12 volts is only 2.4 watts, or about 58 watt-hours per day. You'll get around 4 hours of effective charging per day best case, so a 50 watt panel could deliver as much as 200 watt-hours per day.
You'll want to be sure your charge controller won't overcharge the batteries. You can't just hook a panel up to the batteries without risking overcharging them when you have good sunlight.
Just my opinion, your mileage may vary.....
Al
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“You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO WBCCI 1322
2002 Classic 30 Slideout -S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
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07-02-2015, 08:40 PM
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#4
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Rivet Master
2007 30' Classic
Oswego
, Illinois
Join Date: Jul 2010
Posts: 13,669
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I have a 15w storage panel that works just fine with disconnect switch off. With parasitic draw of about 150mA, I get 750mA of charge power. It keeps my 2 group 29 LA batteries charged up just fine per the Trimetric monitor.
__________________
-Rich-
"If the women don't find you handsome, they should at least find you handy." - Red Green
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07-18-2015, 03:10 PM
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#5
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2 Rivet Member
2014 27' FB International
Longview
, Texas
Join Date: Aug 2014
Posts: 47
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seeks what size solar charger is needed to maintain 2 twelve volt batteries in series, has generator thus only want to maintain batteries when stored.
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07-18-2015, 03:15 PM
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#6
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2 Rivet Member
2014 27' FB International
Longview
, Texas
Join Date: Aug 2014
Posts: 47
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I am trying to determine what size solar generator is needed to maintain 2-12 volt batteries in series. Not trying to use for anything other than storage maintenance. Have generator for the other part, roughing it does include air conditioning, wife say
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07-18-2015, 04:08 PM
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#7
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Rivet Master
Airstream Dealer
Corona
, California
Join Date: Feb 2002
Posts: 16,497
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Quote:
Originally Posted by Wayne Clamp
I am trying to determine what size solar generator is needed to maintain 2-12 volt batteries in series. Not trying to use for anything other than storage maintenance. Have generator for the other part, roughing it does include air conditioning, wife say
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Are you sure you have the 12 volt batteries in series?
If so, you need a 24 volt solar charger, which basically is not around.
Put the batteries in parallel, and then get a 25 to 30 watt solar 12 volt charger.
That is more than enough to keep your 2 batteries "topped off".
Andy
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07-18-2015, 08:55 PM
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#8
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2 Rivet Member
2014 27' FB International
Longview
, Texas
Join Date: Aug 2014
Posts: 47
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Thanks Andy, I got my series and parallel ass backwards
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07-19-2015, 06:42 AM
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#9
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2 Rivet Member
2014 27' FB International
Longview
, Texas
Join Date: Aug 2014
Posts: 47
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Thanks again Andy, I settled on a 50 watt Renogy
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