Reply
 
Thread Tools Search this Thread Display Modes
 
Old 12-04-2008, 06:26 PM   #15
Rivet Master
 
Wingeezer's Avatar
 
2005 30' Classic
Burlington , Ontario
Join Date: Sep 2008
Posts: 2,708
Quote:
Originally Posted by SafariSS View Post
Cant say about the rest, but the jack is wired totally directly to the battery bank with its own inline fuse. I have noticed that my stereo (factory a/v) package power light stays on even with the switch off, so I remove the face of the stereo.

Probably some other stuff staying on as well...
Interesting comments. If some things that consume power remain connected, I wonder what the purpose of the store / isolation switch is? I thought its purpose was to disconnect everything to prevent any drain on the batteries.
__________________

__________________
Brian & Connie Mitchell

2005 Classic 30'
Hensley Arrow / Centramatics
2008 GMC Sierra SLT 2500HD,4x4,Crew Cab, Diesel, Leer cap.
Wingeezer is offline   Reply With Quote
Old 12-04-2008, 06:38 PM   #16
3 Rivet Member
 
2003 25' Safari
spokane , Washington
Join Date: Sep 2005
Posts: 114
Images: 6
good question Winger

That isolation switch will still allow the propane monitor to suck juice from your batteries, only way to really kill it is either remove the batteries or disconnect them....fwiw I just ran out and metered mine again, 12.7 and holding for 6 weeks now (AGM's with ground disconnected) and it's been butt ugly cold here to boot.
__________________

__________________
wasafari is offline   Reply With Quote
Old 12-04-2008, 09:09 PM   #17
Rivet Master
Commercial Member
 
New Borockton , Alabama
Join Date: Sep 2002
Posts: 1,288
Images: 21
Something caught my attention on the OP post. Equalize. Not sure why that was done and its possible it was needed. My point and recommendation is to avoid equalization until necessary. Its hard on batteries and for lack of a better way of putting it, it does revive batteries that have sulfated but causes some scar tissue so to speak so wait until the surgery is necessary. I know that sounds corny but equalization for the sake of it will shorten their life. Sometimes it is definitely necessary and a great way to revive your batteries. These were 2008 new batteries so that is what caught my attention.
__________________
Randy...Converters, Inverters, Trimetric, Surge Protectors, Zamp Solar, AGM Batteries
www.bestconverter.com
68 Overlander is offline   Reply With Quote
Old 12-05-2008, 09:47 AM   #18
Rivet Master
 
boondockdad's Avatar
 
2008 30' Classic S/O
Dearborn , Michigan
Join Date: Aug 2006
Posts: 1,295
Images: 21
Thanks all…
I'm in the middle of tracking down electrical system gremlins, and I wanted to first be sure my batteries were good/holding charge...
I had the trailer in storage for about four weeks, with the 'kill switch' engaged (that is, set for storage), and I found dead batteries...
So-
Lets say the batts were at 12.5v when I stored… how would I derive the SOC from a 2% drop in voltage, and a .08 amp parasitic draw?

My thinking could be way off here… but that draw over four weeks, would amount to about -50Ah drain on a bank of 200Ah… so theoretically, the batts should be at 75%.. with the 2% dead load- that would amount to about 25% off the SOC… is it logical to assume we’re at 50% SOC on the batteries (dead)?
__________________
boondockdad is offline   Reply With Quote
Old 12-05-2008, 10:02 AM   #19
Rivet Master
 
boondockdad's Avatar
 
2008 30' Classic S/O
Dearborn , Michigan
Join Date: Aug 2006
Posts: 1,295
Images: 21
Quote:
Originally Posted by SafariSS View Post
Cant say about the rest, but the jack is wired totally directly to the battery bank with its own inline fuse. I have noticed that my stereo (factory a/v) package power light stays on even with the switch off, so I remove the face of the stereo.

Probably some other stuff staying on as well...
the CD disc changer stays on as well... unless you open the door... and IIRC it would cycle every so often, and draw as much as an amp...

IMHO, the wiring in this a/s is for sh*t
__________________
boondockdad is offline   Reply With Quote
Old 12-05-2008, 06:26 PM   #20
Rivet Master
 
boondockdad's Avatar
 
2008 30' Classic S/O
Dearborn , Michigan
Join Date: Aug 2006
Posts: 1,295
Images: 21
Quote:
Originally Posted by mistermcfrug View Post
I just happened to stumble across finalcutjoe's topic of batteries here. I've no important comment on his battery situation but I must say I recognize his photo on his comment of General Jack Ripper from the movie "Dr. Strangelove."

Maybe finalcutjoe wants Mandrake to protect the "precious bodily fluids" of those batteries!
hilarious movie... Peter Sellers at his finest (next to Pink Panther Strikes Again... and Shot in the Dark!)... Lionel Mandrake, President Muffey, Dr. Strangelove...

"Fluoridation is the most monstrously conceived and dangerous communist plot we have ever had to face."

-General Jack D. Ripper
__________________
boondockdad is offline   Reply With Quote
Old 12-05-2008, 10:25 PM   #21
moderator
Commercial Member
 
Airslide's Avatar

 
2014 23' FB International
Currently Looking...
Wilton , California
Join Date: Aug 2008
Posts: 1,705
Images: 50
Send a message via Yahoo to Airslide
My stereo stayed on too.. but when i held the off button down for like 5 seconds it totally shut off..
__________________
"Old fashioned service on your late model Airstream"

https://www.facebook.com/VinniesNort...ir?ref=tn_tnmn
Airslide is offline   Reply With Quote
Old 12-06-2008, 10:18 AM   #22
Rivet Master
 
Gene's Avatar
 
2008 25' Safari FB SE
Grand Junction , Colorado
Join Date: Sep 2007
Posts: 10,840
Holding down the "off" button until all the lights go off on our stereo is the way to really shut it off. Otherwise it shuts off the radio or whatever, but messages keep going on the front so something's going on in there. Took me a while to figure out you have to hold down the button to actually turn it off.

The battery disconnect switch and light are mystifying since the light stays on when the switch is off in certain combinations of things (I can't remember what combinations, sorry, I'm old). My light never went off and there was a short somewhere which was fixed on warranty.

I checked my batteries with a new specific gravity tester and all the cells read perfect. So I unplugged shore power and only the solar panel will charge it. I'll see what the readings are after several days. I know I am hoping the batteries are no good so I can get better ones, but then I realize that will cost me money. It's so hard to be conflicted.

The electrical things on my trailer are even more confusing than on a car. I can usually figure it out after a while (which often includes a lot of bad words), but never really feel comfortable. The instructions for various things usually are written to be understood only by the electrical engineer who invented the thing and no mere mortal.

Gene
__________________
Gene is offline   Reply With Quote
Old 12-06-2008, 11:06 AM   #23
3 Rivet Member
 
hshovic's Avatar
 
2007 25' Safari FB SE
Bozeman , Montana
Join Date: Apr 2007
Posts: 222
Images: 20
Battery charge, volts, capacity by temperature

I also have the chart for voltage and charge as given above.
However, it is at 70 deg F. Battery voltage at full capacity lowers with temperature. And so does capacity (about 30% at 30 deg F).

So when monitoring battery voltage to determine how much capacity I have, the temp must be factored in. The web has a bunch of charts on how to do that. At 70 deg, 100% capacity is 12.6 or 12.7. At 70 deg, 50% capacity is 12.06 volts.

But at 40 deg, 100% capacity is 12.3 volts. At 40 deg, 50% capacity is 11.76 volts, and the total capacity is down 25%.

Sounds unfair , but it seems true. Batteries work better when warmer.

The AS battery monitor does not recognize this subtlety, nor do most inverters, so sometimes my inverter will not work, even though capacity is still up there, and the AS battery monitor goes orange, even though I have capacity left.
__________________
Hank
WBCCI 1489 AIR 20708
2015 Chevy 3/4 ton 4 x 4 gas; 2007 Safari FB SE
"Its better to light just one candle than to curse the darkness,
Unless you're blinded by the light..."
hshovic is offline   Reply With Quote
Old 12-06-2008, 12:41 PM   #24
Rivet Master
 
1975 29' Ambassador
Reno , Nevada
Join Date: May 2003
Posts: 1,351
IMHO Rvers don't need to use hydrometers with their attendant hazards on modern batteries. Touchy topic for some, though. I don't know why.

Batteries may have more capacity when warmer but they don't live as long. Heat will kill batteries.

Quote:
The AS battery monitor does not recognize this subtlety, nor do most inverters
This can be a big deal in storage as it makes a proper float voltage rather tricky. It is one reason why I think the PD+CW or WFCO approach works. That is to keep the float a tad low to avoid boiling off electrolyte but to bump it every few hours top up the charge and circulate the electrolyte.
__________________
bryanl is offline   Reply With Quote
Old 12-06-2008, 01:40 PM   #25
Rivet Master
 
Gene's Avatar
 
2008 25' Safari FB SE
Grand Junction , Colorado
Join Date: Sep 2007
Posts: 10,840
Hank, those unfair batteries send me contradictory readings when it's in the 20's. The solar monitor has lower readings than the Airstream monitor. This is my second monitor as the first one worked for a while, then went crazy. As a result, I don't particularly believe it. Anyway, the solar monitor reads battery voltage (among other things) and can easily go to 50% or lower late at night with the furnace fan on while, the Airstream monitor is telling me the batteries are at a higher charge—maybe 3/4.

So, the unsophisticated Airstream monitor gives readings that are higher when it's cold and that's why I'm getting 3/4 when the solar monitor is reading much lower. If I understand what you're saying, the Airstream monitor reads higher than actual voltage when it's cold. Or have I got it backwards? If I've got it right the solar monitor is right on and that tells me why I'm not getting the charge when it's cold from the solar panels that I expect—maybe. It seems to discharge quickly the colder it is, or maybe quicker than I remember from a year ago.

Certainly the info about voltages at 40˚ vs. 70˚ is good to know and thanks for that.

Gene
__________________
Gene is offline   Reply With Quote
Old 12-06-2008, 01:44 PM   #26
Rivet Master
 
1975 29' Ambassador
Reno , Nevada
Join Date: May 2003
Posts: 1,351
also keep in mind that voltage (or specific gravity for that matter) readings are easiest to interpret on a quiet resting battery.

I find that a good half hour or more of no significant loads (e.g. furnace, water pump) or charging is good enough for a rough idea about my battery state of charge.
__________________
bryanl is offline   Reply With Quote
Old 12-08-2008, 07:43 PM   #27
3 Rivet Member
 
hshovic's Avatar
 
2007 25' Safari FB SE
Bozeman , Montana
Join Date: Apr 2007
Posts: 222
Images: 20
Temps and monitor

Gene,
That's just the opposite of mine. Lower temperatures mean lower AS monitor voltage than measured on my solar. I know the solar may read high in the sun, so I generally check it when it is dark.

Or I could just quit going out so late in the year....
__________________
Hank
WBCCI 1489 AIR 20708
2015 Chevy 3/4 ton 4 x 4 gas; 2007 Safari FB SE
"Its better to light just one candle than to curse the darkness,
Unless you're blinded by the light..."
hshovic is offline   Reply With Quote
Old 01-31-2009, 11:12 PM   #28
New Member
 
2008 27' International CCD FB
Gilbert , Arizona
Join Date: Jan 2009
Posts: 2
Just put two new T105 Trojan 6 volt batteries in my 08 International to replace the Interstate series 24 batteries. Had a local welder cut the bottom off the battery box and weld in a 3" strip of metal all around. He did a great job ($112) and I painted the new bottom with touchup paint from airstream. Looks and works great. Went from 160 amp hours to 225.
__________________

__________________
agbliss9615 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
Drop Receiver, Yes or No? RBolton Hitches, Couplers & Balls 6 12-11-2007 09:34 PM
Jack Drop WestMichCamp Jacks, Stabilizers, Lifting and Leveling 6 08-26-2007 10:33 PM
GM to Drop Quadrasteer RoadKingMoe Tow Vehicles 20 03-09-2005 09:38 PM
How to drop the tranny? (If I even need to) Impala SS Guy Mechanics Corner - Engines, Transmission & More... 13 10-06-2003 08:03 AM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 08:44 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.