Go Back   iRV2 Forums > TRAVEL TRAILER, 5th WHEEL & TRUCK CAMPER FORUMS > Travel Trailer Discussion
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 07-05-2015, 08:55 PM   #1
Senior Member
 
Sammie's Avatar
 
Tiffin Owners Club
Join Date: Jun 2006
Location: Southern California
Posts: 1,779
Airstream Battery Charger?

My brother in law just bought a 2012 Airstream 23 ft trailer and was wondering what the battery charging capacity is? When plugged into 30 amps, how many amps 12 volt are the batteries being charged at?

Thanks, Sammie
__________________

__________________
2015 Tiffin Bus 37AP
2016 Ford Explorer
"A Job Begun is Half Done"
Sammie is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 07-09-2015, 09:34 AM   #2
Senior Member
 
Join Date: Dec 2013
Posts: 164
Sammie-

We have to know the make and model of the 120v to 12v converter/charger in order to answer your question. And, charging volts is just as important as amps in deep cycle battery charging.

Here is some generic info:

Last updated
__________________

__________________
1998 Kit 23' TT, 210 AH, PM4B-45, RV-30S PWM, 280w solar, Trimetric, Wave 3, Samlex PST-150w
2004 Nissan Titan 4x4 with Tow, Hellwig helper springs, Banks Catback
BendOR is offline   Reply With Quote
Old 07-09-2015, 02:03 PM   #3
Senior Member
 
wa8yxm's Avatar
 
Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 22,799
Note also that the relationship between amps sucked by the converter and amps put into the battery is around 1:9 (Ideally 1:10)

That is ideally if the converter is uptting out 20 amps, only 2 amps are taken in, (in practice closer to 2.5)
__________________
Home is where I park it!
wa8yxm is offline   Reply With Quote
Old 07-11-2015, 08:29 AM   #4
Member
 
Texas SteveH's Avatar
 
Freightliner Owners Club
Join Date: Jan 2014
Posts: 31
The converter in that sized Airstream is probably around 45 amps., however if original it is a dumb converter, not a three stage smart charger, and will put out a nominal 14 vdc., which means the batteries will accept the amount of charge current they need by the state of charge condition they are in, up to close to 45 amps.


They are known for boiling the water out of the batteries if left on continuously. Many people change them out for better quality three stage smart chargers.


They do have a sticker on them that states the capacity.
__________________
Texas SteveH is offline   Reply With Quote
Old 07-11-2015, 08:37 AM   #5
Senior Member
 
Sammie's Avatar
 
Tiffin Owners Club
Join Date: Jun 2006
Location: Southern California
Posts: 1,779
Quote:
Originally Posted by Texas SteveH View Post
The converter in that sized Airstream is probably around 45 amps., however if original it is a dumb converter, not a three stage smart charger, and will put out a nominal 14 vdc.


They are known for boiling the water out of the batteries if left on continuously. Many people change them out for better quality three stage smart chargers.


They do have a sticker on them that states the capacity.

TexasSteve,

My brother will be dry camping in Yellowstone this summer and was wondering if he will be able to recharge his batteries using a little 800 watt Honda generator. He will plug the trailer shore power cord into the generator for charging maybe twice a day.

Thanks, Sammie
__________________
2015 Tiffin Bus 37AP
2016 Ford Explorer
"A Job Begun is Half Done"
Sammie is offline   Reply With Quote
Old 07-11-2015, 12:13 PM   #6
Member
 
Texas SteveH's Avatar
 
Freightliner Owners Club
Join Date: Jan 2014
Posts: 31
Quote:
Originally Posted by Sammie View Post
TexasSteve,

My brother will be dry camping in Yellowstone this summer and was wondering if he will be able to recharge his batteries using a little 800 watt Honda generator. He will plug the trailer shore power cord into the generator for charging maybe twice a day.

Thanks, Sammie
Should work fine.
__________________
Texas SteveH is offline   Reply With Quote
Old 07-15-2015, 11:16 PM   #7
Member
 
Join Date: Apr 2015
Posts: 31
Not a problem. I have a 40 amp converter and use an 800 watt generator with no issues. Even has a little bit of room to spare for a laptop and projector.
__________________
shepd is offline   Reply With Quote
Old 12-09-2015, 07:11 AM   #8
Member
 
nvestysly's Avatar
 
Thor Owners Club
Join Date: Apr 2010
Posts: 93
Have you found answers to all your questions? I realize this is an old thread but felt I could add to the discussion so here goes...

I went down this road a few years ago and found several aspects of the converter supplied in my Airstream meant the converter was less than optimum. In addition, there are other things that you (and your brother) have not considered.

Several responses to your questions bear repeating and more thorough discussion.

Yes, the 800 watt generator will likely charge the batteries but that's not the entire answer in my mind. Boondocking necessitates more than a simple yes, I can charge the batteries answer.

As mentioned above, the Airstream is likely equipped with a single-stage (aka "dumb") converter. If so, this type of system is not optimum and will not recharge the batteries as quickly as a multi-stage converter. The multi-stage converters have the advantage of charging more quickly and when plugged in for long periods of time will maintain the battery charge in a more efficient manner compared to single-stage converters. If the unit is not multi-stage your brother should consider this upgrade. There are lots of brands on the market - some better than others - I chose a Progressive Dynamics PD9260.

For late model Airstreams like you brother owns, something like the PD4600 shown here is probably the right answer:

4600 Series Upgrade or Replacement Power Converters

Boondocking is not simply about whether the battery(ies) can be recharged. Does your brother have one or two batteries? Some Airstreams only have one battery. Two is obviously better (more capacity) for boondocking. Be sure the batteries are suitable for true deep-cycling. Some batteries are referred to as dual purpose, RV, marine or some other marketing mumbo-jumbo that's not all that useful. Batteries for this application are rated in Amp hours (Ah) not cold cranking amps (CCA). Cold Cranking Amps is for batteries used to start an engine. A typical flooded, lead-acid, deep-cycle battery will be in the range of 80 - 100 Ah. The higher end of the scale is better for more capacity.

Absorbed Glass Mat (AGM) batteries are often touted as superior to flooded, lead-acid batteries. Both are lead-acid so maybe it's more correct to simply refer to the distinction as AGM vs. flooded. Many deep-cycle AGM batteries are on the low end of the scale when it comes to Ah rating. For that reason, I think flooded batteries are better for most RVers but there are caveats to that. Assuming your batteries are in an outside storage compartment (most Airstreams are built this way), flooded is probably the way to go and your brother will likely be able to find batteries that are rated at 100 Ah or even a little more.

I know I'm making a big deal about the Ah rating but it makes a big difference on how often and for how long the batteries will need to be recharged.

Another significant aspect of boondocking is knowing how much power is being used from the batteries. It's surprising to see how much power is drained even if using LED lights. The key is don't use power consuming devices unless necessary. To get a full understanding of how much power is being consumed your brother should consider a battery monitor system. There are a variety of ways to implement a battery monitor ranging from hard-wired to wireless, smart phone monitoring. However, all the systems require a precision shunt to be installed in the system. This is a relatively straightforward modification but it does take some understanding of the battery wiring and a willingness to figure out where/how to install the shunt. It's a do-it-yourself job for some or it can be done by a service technician. Be aware that some service technicians don't understand how to install semi-custom items like a battery monitor system so it's a good idea to find a qualified shop.

Here are two means of battery monitoring - one hard-wired, the other wireless:

TriMetric Battery Monitor

https://teambmpro.com/au/shop/battery-check.html

Hope all is going well for your brother. Even if he has successfully boondocked with his current system it may be worth considering some of the items discussed on this thread.
__________________

__________________
Lucius & Danielle
1992 - 29' Airstream Classic
1996 GMC Suburban 7.4L, C2500; 2005 Chevrolet Suburban 8.1L, K2500
nvestysly is offline   Reply With Quote
Reply

Tags
airstream, battery



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
Battery Charger Question HansHH RV Systems & Appliances 2 05-09-2015 09:33 AM
Battery Tray: Not a Mod, Just a Cleanup JFXG Newmar Owner's Forum 21 12-01-2014 07:33 AM
Chassis Battery Issue TXBart Entegra Owner's Forum 35 11-03-2014 04:48 PM
Trying to wire a TOAD battery charger mmullane Palazzo Motorhomes 7 10-19-2014 10:32 PM
Pump on battery charger WDW Class C Motorhome Discussions 2 10-10-2014 04:04 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 03:17 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.