Reply
 
Thread Tools Search this Thread Display Modes
 
Old 12-09-2019, 07:42 PM   #1
1 Rivet Member
 
2019 22' Sport
Brunswick , Georgia
Join Date: Feb 2019
Posts: 9
AGM battery dead with Solar panel

I have a 22' Airstream Bambi Sport. It has the factory installed 40w solar panel and an AGM battery. It has been sitting in a storage lot for 35 days in the full sun. It has been cloudy here about 7 days. I went and checked it and my battery was discharged with no signs of life on my solar panel display. I was able to charge the battery to 12.8v with an AGM battery charger and get it working again but shouldn't my solar panel keep it charged? I'm confused. There is nothing on in the RV except the carbon monoxide detector. The On/Off switch to the battery is in the On position. Any help would be greatly appreciated.

Thanks!
__________________

Gypsymimi is offline   Reply With Quote
Old 12-09-2019, 07:49 PM   #2
Rivet Master
 
wulfraat's Avatar
 
2017 30' International
Broomfield , Colorado
Join Date: Apr 2009
Posts: 2,068
Images: 1
If the battery switch was “on” then your fridge, stereo and other 12v items were drawing power in stand by mode. Need to keep that switch in the off position when in storage.

40w is marginal to keep the battery charged.
__________________

wulfraat is offline   Reply With Quote
Old 12-09-2019, 07:49 PM   #3
Overkill Specialist
 
GMFL's Avatar

 
2014 23' International
Dadeville , Alabama
Join Date: Oct 2015
Posts: 3,511
Images: 4
Blog Entries: 52
You have 1 AGM battery? And 40 watts of solar?
GMFL is offline   Reply With Quote
Old 12-09-2019, 08:00 PM   #4
Overkill Specialist
 
GMFL's Avatar

 
2014 23' International
Dadeville , Alabama
Join Date: Oct 2015
Posts: 3,511
Images: 4
Blog Entries: 52
Here’s the basic math.
Your trailer pulls about 0.5 amp parasitic
That’s 12 amps per day
7 days without much power from your 40 watts of solar due to clouds and winter sun angle.
Could equal approx 70Ah pulled from your (1) 100Ah AGM battery = 70% of battery used = dead battery
GMFL is offline   Reply With Quote
Old 12-09-2019, 08:00 PM   #5
Rivet Master
 
wulfraat's Avatar
 
2017 30' International
Broomfield , Colorado
Join Date: Apr 2009
Posts: 2,068
Images: 1
If the battery switch was “on” then your fridge, stereo and other 12v items were drawing power in stand by mode. Need to keep that switch in the off position when in storage.

40w is marginal to keep the battery charged.
wulfraat is offline   Reply With Quote
Old 12-09-2019, 08:03 PM   #6
3 Rivet Member
 
2018 25' International
Slidell , Louisiana
Join Date: Sep 2017
Posts: 182
Yeah, something is seriously wrong. /start with the solar charger. What does the display tell you?
__________________
Brian
BayouBiker is offline   Reply With Quote
Old 12-09-2019, 09:41 PM   #7
1 Rivet Member
 
2019 22' Sport
Brunswick , Georgia
Join Date: Feb 2019
Posts: 9
Quote:
Originally Posted by GMFL View Post
You have 1 AGM battery? And 40 watts of solar?
Yes, I have one AGM battery and 40 watts of solar
Gypsymimi is offline   Reply With Quote
Old 12-09-2019, 09:43 PM   #8
1 Rivet Member
 
2019 22' Sport
Brunswick , Georgia
Join Date: Feb 2019
Posts: 9
Quote:
Originally Posted by BayouBiker View Post
Yeah, something is seriously wrong. /start with the solar charger. What does the display tell you?
The display was completely blank. It usually tells me that the battery is charging and it has 12.9 volts
Gypsymimi is offline   Reply With Quote
Old 12-09-2019, 09:46 PM   #9
1 Rivet Member
 
2019 22' Sport
Brunswick , Georgia
Join Date: Feb 2019
Posts: 9
Quote:
Originally Posted by wulfraat View Post
If the battery switch was “on” then your fridge, stereo and other 12v items were drawing power in stand by mode. Need to keep that switch in the off position when in storage.

40w is marginal to keep the battery charged.
Will the solar panels still charge the battery if the switch is in the "off" position.
Gypsymimi is offline   Reply With Quote
Old 12-10-2019, 06:32 AM   #10
3 Rivet Member
 
2019 27' International
Western , North Carolina
Join Date: Jun 2019
Posts: 168
Images: 1
Quote:
Originally Posted by Gypsymimi View Post
Will the solar panels still charge the battery if the switch is in the "off" position.


It does on my 27 with factory solar. It’s how I store it.
__________________
2019 International Serenity 27 FBQ “Serenity”

2019 Ford F-350 Platinum
JonDNC is offline   Reply With Quote
Old 12-10-2019, 07:07 AM   #11
Half a Rivet Short
 
2017 30' Classic
Carlisle , Pennsylvania
Join Date: May 2017
Posts: 8,527
Quote:
Originally Posted by Gypsymimi View Post
Will the solar panels still charge the battery if the switch is in the "off" position.
Hi

Yes, that's how it is set up to work.

======

Depending on just what was doing what in the trailer, you could have had quite a bit of current coming off the battery. Unless you have a (aftermarket) shunt based monitor there really isn't any way to be *sure* what is going on.

Bob
uncle_bob is offline   Reply With Quote
Old 12-10-2019, 08:11 AM   #12
Rivet Master
 
AirMiles's Avatar
 
2018 27' Globetrotter
Apollo Beach , Florida
Join Date: Feb 2017
Posts: 1,090
You can determine the amp draw on your Airstream with a Clamp On Digital Amp Meter. This is the one I use: https://www.amazon.com/dp/B01N014USE/ref=emc_b_5_t

I agree you should store your Airstream with the store/use switch in "store" and the solar should charge the battery. If you had it in "use", your amp draw is probably larger than the 40W panel can maintain, so your battery died. A 40W panel would barely be enough maintain the 120W per day of solar my Airstream uses while its stored.
__________________
2018 Globetrotter 27Q, 32 nights 4,935 miles, 600W Solar, PD4655L, 6V Batteries, ProPride, 16" Michelin's, 2019 F250 PSD
Sold: 2017 Flying Cloud 25FB, 316 nights 40,150 miles, 400W Solar
Sold: 2013 Casita SD17 89 nights 16,200 miles
Solar Production: 213 kWh in 248 days of use
AirMiles is offline   Reply With Quote
Old 12-10-2019, 08:17 AM   #13
3 Rivet Member
 
2018 25' International
Slidell , Louisiana
Join Date: Sep 2017
Posts: 182
Quote:
Originally Posted by Gypsymimi View Post
Will the solar panels still charge the battery if the switch is in the "off" position.
If the Solar system was installed correctly it will, On my trailer they installed the primary lead from the solar controller to the load side of the disconnect solenoid rather than the lead side or the battery hot bus so originally mine did not charge in "off" position. Don't rule anything out till you've tested it.
__________________
Brian
BayouBiker is offline   Reply With Quote
Old 12-10-2019, 08:21 AM   #14
3 Rivet Member
 
2018 25' International
Slidell , Louisiana
Join Date: Sep 2017
Posts: 182
Quote:
Originally Posted by Gypsymimi View Post
The display was completely blank. It usually tells me that the battery is charging and it has 12.9 volts
The solar controller needs some power to run so if the battery is dead and the panels have no sun it will be lack. Otherwise there should be something going on on the controller display. If it is still dark, then it is likely broken unless yours happens to have a power switch (mine does not, its always on).
__________________
Brian
BayouBiker is offline   Reply With Quote
Old 12-10-2019, 09:20 AM   #15
1 Rivet Member
 
2019 22' Sport
Brunswick , Georgia
Join Date: Feb 2019
Posts: 9
Quote:
Originally Posted by BayouBiker View Post
If the Solar system was installed correctly it will, On my trailer they installed the primary lead from the solar controller to the load side of the disconnect solenoid rather than the lead side or the battery hot bus so originally mine did not charge in "off" position. Don't rule anything out till you've tested it.
How would I test this? Thanks.

Patti
Gypsymimi is offline   Reply With Quote
Old 12-10-2019, 09:28 AM   #16
Rivet Master
 
AirMiles's Avatar
 
2018 27' Globetrotter
Apollo Beach , Florida
Join Date: Feb 2017
Posts: 1,090
Quote:
Originally Posted by Gypsymimi View Post
How would I test this? Thanks.

Patti
You can use the same digital amp meter linked above: https://www.amazon.com/dp/B01N014USE/ref=emc_b_5_t

On a sunny day with the store/use switch in the "store" position, check the voltage across the positive and negative battery post. If the voltage is above 13 volts, your solar is charging your battery. You could also check the amps by clamping the meter around the negative battery cable. If amps read over 0.5, your battery is charging.
__________________
2018 Globetrotter 27Q, 32 nights 4,935 miles, 600W Solar, PD4655L, 6V Batteries, ProPride, 16" Michelin's, 2019 F250 PSD
Sold: 2017 Flying Cloud 25FB, 316 nights 40,150 miles, 400W Solar
Sold: 2013 Casita SD17 89 nights 16,200 miles
Solar Production: 213 kWh in 248 days of use
AirMiles is offline   Reply With Quote
Old 12-10-2019, 10:24 AM   #17
1 Rivet Member
 
2019 22' Sport
Brunswick , Georgia
Join Date: Feb 2019
Posts: 9
Quote:
Originally Posted by AirMiles View Post
You can use the same digital amp meter linked above: https://www.amazon.com/dp/B01N014USE/ref=emc_b_5_t

On a sunny day with the store/use switch in the "store" position, check the voltage across the positive and negative battery post. If the voltage is above 13 volts, your solar is charging your battery. You could also check the amps by clamping the meter around the negative battery cable. If amps read over 0.5, your battery is charging.
Thanks so much!
Gypsymimi is offline   Reply With Quote
Old 12-10-2019, 10:37 AM   #18
Rivet Master
 
gator.bigfoot's Avatar
 
2007 30' Classic
KW , Ontario
Join Date: May 2012
Posts: 502
Check the input to the solar charger and make sure you are getting voltage there. If not start there. If you are getting voltage then hopefully it's above 15 volts. If not then you have a faulty panel or not enough sunlight. Once you've determined that, measure the output of the solar charger. It should be at the same voltage as the battery. You could disconnect the charger from the battery and see if you're getting a higher voltage. But some chargers recognize that there is no battery and will shut down as a safety precaution.
gator.bigfoot is online now   Reply With Quote
Old 12-10-2019, 11:39 AM   #19
2 Rivet Member
 
2017 22' Sport
Salisbury , Maryland
Join Date: Dec 2016
Posts: 27
Images: 8
Solar

I have a 22 Bambi Sport with one 12v AGM Lifeline battery. I have 3 80 watt panels... Mine stays fully charged all year round. I will even run the Fridge on 12 volt, in the summer
Thonevan is offline   Reply With Quote
Old 12-10-2019, 12:05 PM   #20
3 Rivet Member
 
1985 31' Excella
st. Paul , mn
Join Date: May 2007
Posts: 132
I would avoid having Airstream do anything with solar - too many lack of engineering / design issues .
Even before solar / older Airstreams , they did not care [ would not bother to look into what there systems would do to a battery ] and then the dealers would not bother to take care of what the manufactures , didn't do , to maintain a battery with just a charger ] many yrs. the charger would kill the battery , and besides leaving the battery in the trailer for how many months , yrs. before the sale --- killing batteries .
This is to the point of - never take possession of a new / or used trailer without new batteries / NEW WHEN YOU PICKUP !

Now have a properly ENGINEERED battery , and or solar system installed .
Like most , you do not want to be the engineer - just turn-key & use - that costs money .
Or if you do chose to learn & maintain - you can get many yrs. out of the batteries etc.
My last FLA - Flooded Lead Acid battery bank , ran even my airconditioner and lasted about 13 yrs.
__________________

__________________
85 Excella , 31' , electric brakes , R. twin [ would like it to be a single ] , future upgrades , composting toilet [ replace black water tank with a 2nd fresh ] , solar power , instant hot water heater .
Tow 94 Dodge Ram , 4x4 , Cummins , AT .
JohnTF 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
Dead 3-year old AGM battery flyingfishy Batteries, Univolts, Converters & Inverters 44 09-20-2018 04:49 PM
Dead Batteries AGM sheinzer 2018 - Current Globetrotter 2 04-21-2018 02:16 PM
house battery seem dead/ shore power dead joe rv guy Sprinter and B-van Forum 29 12-26-2016 01:36 PM
Battery AGM (4) 6V GC2 vs (2) AGM 8D Torpedo Family Land Yacht/Legacy Motorhomes 3 11-15-2012 06:35 PM
Leaving an AGM battery in my Airstream over the winter (solar charger) wacnstac Batteries, Univolts, Converters & Inverters 0 05-25-2009 09:13 PM


Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:50 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.