Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
 


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-09-2017, 12:13 PM   #1
1 Rivet Member
 
1983 27' International
Brooklyn , Wisconsin
Join Date: Jun 2017
Posts: 14
please explain.. AC run on 12V only?

I'm trying to figure out why my new to me (1977 International) the new RV battery goes dead within hours when running Air conditioner (lights run it down too)- even when trailer is plugged into AC outlet? Is their a switch I need to do something with to run the AC off house current rather than 12v or is it 12v only? When trailer is plugged into 110 house current shouldn't the battery stay up when AC is being run.. via a charger? my old coleman pop-up had a converter that converted ac to 12v to run things... thank you for any help!
silvertime is offline   Reply With Quote
Old 07-09-2017, 12:23 PM   #2
Ready-to-Travel
 
pmclemore's Avatar

 
2012 30' International
Walkerton , Virginia
Join Date: Dec 2003
Posts: 3,165
Silver, a couple of things:

Your AC runs only on 120 volts. That your battery seems to run down at the same time would indicate to me that either your converter is not charging your battery, or, more likely, your battery is shot (not capable of holding a charge).

Pat
__________________
--------------------------------------
Somebody, please, point me to the road.

AIR 3987
TAC VA-2
WBCCI 4596
pmclemore is offline   Reply With Quote
Old 07-09-2017, 12:30 PM   #3
Rivet Master
 
Al and Missy's Avatar
 
2002 30' Classic S/O
Fleming Island , Florida
Join Date: Nov 2013
Posts: 4,667
If somehow you are running the air conditioner off of the inverter, the converter may not be able to keep up. I didn't know that was possible, it may have been wired so that the inverter can run anything in the trailer, and you will have to use discipline to make sure you don't have too much load. The air conditioner draws around 15 amps. Multiplying that by the voltage ratios 120/12 is 10 times, or about 150 amps from your 12V system. I doubt that your converter has that much capacity. If you have an inverter/charger, it may have that much capacity, but I doubt it. The Magnum Hybrid 3000 watt unit only has 125A charge capacity.

I'm guessing here since I have no idea how your trailer is wired but I suspect that, when on shore power, you should turn the inverter off and this will operate all 120V loads from shore power, not the inverter.

You may have damaged your batteries by too much deep discharge, as well.

Al
__________________
“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
Al and Missy is offline   Reply With Quote
Old 07-09-2017, 12:58 PM   #4
Half a Rivet Short
 
2017 30' Classic
2022 Interstate 24X
Carlisle , Pennsylvania
Join Date: May 2017
Posts: 15,674
Hi

On an AS that is around 35 years old, lots of odd things may have been done over the years. Guessing based on the stock configuration may not be the right thing to do. You may have some sort of re-wire that cuts out a bunch of stuff when the AC is turned on. If so, some "quality time" with a multimeter is called for. Even if that's not the case, there is still poking around to do.

1) Is the converter getting 120V?
2) Is the converter putting out 12V (or 13.5 or 14.2)?
3) Is the converter output the same as the battery voltage?
(if not is what is the use/store switch set to?)
4) Are any fuses blown?
5) Is the inverter on when you are on shore power?
(if so why?)
6) How old are the batteries? If > 6 years, that's likely a problem.

Yes this list keeps going on and on. A lot of where it goes depends on what you find to this point.

Bob
uncle_bob is offline   Reply With Quote
Old 07-09-2017, 01:19 PM   #5
Rivet Master
 
Currently Looking...
Mantua , Ohio
Join Date: Jul 2005
Posts: 7,062
Blog Entries: 2
Let's not confuse inverter with converter. I doubt that vintage trailer has an inverter.
xrvr is offline   Reply With Quote
Old 07-09-2017, 01:51 PM   #6
Retired.
 
Currently Looking...
. , At Large
Join Date: Jun 2003
Posts: 21,276
Is the converter turned on? Many Airstreams have a dedicated switch to turn the converter off and on.
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
overlander63 is offline   Reply With Quote
Old 07-09-2017, 02:11 PM   #7
Rivet Master
 
Al and Missy's Avatar
 
2002 30' Classic S/O
Fleming Island , Florida
Join Date: Nov 2013
Posts: 4,667
Quote:
Originally Posted by avionstream View Post
Let's not confuse inverter with converter. I doubt that vintage trailer has an inverter.
OP's comments sound like the AC will run without shore power. If that is the case, then someone has added an inverter, but wired it to supply the whole trailer, not just specific outlets as is done in more modern trailers that are supplied with inverters.

Maybe OP just assumed that the AC was running down the battery, and says the battery is new. Lights shouldn't run the battery down in a a few hours.

Bob's questions are a good start. I'd suggest a couple first questions to clarify the problem:

1. Does the air conditioner run when shore power is not connected?
2. Do you have an inverter, and is it just an inverter, or an inverter charger. If just an inverter you should have a converter somewhere.

Al
__________________
“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
Al and Missy is offline   Reply With Quote
Old 07-09-2017, 02:47 PM   #8
1 Rivet Member
 
1983 27' International
Brooklyn , Wisconsin
Join Date: Jun 2017
Posts: 14
thanks.. everyone- guess I need to dig deeper

I don't know how to switch the inverter/converter or whichever it is off? I do know that it is in a sealed area inside a box under the front couch. only thing I can reach is the cord plugged into a outlet way down under there (bit warm too when camper is plugged in for awhile)- I don't see where you can switch it on/off? I only have one RV battery- it slides out the front of the camper when door is open. As far as I can tell as of now without any other checking the only thing that works when the camper is plugged in is the wall outlets- nothing else (AC or lights do not when battery goes dead). I just put the battery in 2 weeks ago. I also noticed when I got it the big 50A fuse was blown in panel but that was replaced. If anybody that has a 31ft 77 Int.and knows where the on/off is for inv/conv please let me know- but I still need to see why battery isn't charging on shore line- I'm at this time thinking inverter is toast? does all ac power go through it before going to it's designated location? I imagine outlets not as they still work on ac.
silvertime is offline   Reply With Quote
Old 07-09-2017, 07:50 PM   #9
1 Rivet Member
 
1983 27' International
Brooklyn , Wisconsin
Join Date: Jun 2017
Posts: 14
*update* on please explain..

upon further checking- and my neglect in remembering- The Air Conditioner does run when shoreline power is used and no 12v. It did knocked out a breaker in garage first time I used it after few minutes but hasn't since (it sat 6 years not used) It is the lights that run the battery dead I think. whether AC is able to run on 12v or not I don't know.. I'll try it next time battery is charged and shoreline power is unhooked. I'd never camp anywhere where no shoreline power was available anyway and if I did just not use AC. It appears the issue is the converter/charger isn't charging battery when plugged into shoreline power. Haven't checked the condition of battery yet as brand new- but guess could still be bad. I'm only getting 12.72 on tester at battery when fully charged and the shoreline power is plugged in. The Air Stream has not gone nowhere yet as only owned few weeks. sorry if terminology is wrong.. new to AS.
silvertime is offline   Reply With Quote
Old 07-10-2017, 11:30 AM   #10
Half a Rivet Short
 
2017 30' Classic
2022 Interstate 24X
Carlisle , Pennsylvania
Join Date: May 2017
Posts: 15,674
Hi

If you have the original converter/charger from back in 1977, it may be past it's "use by" date. That's not a terribly uncommon issue on any 40 year old electronic item. If indeed it's putting out a max of 12.7V that's a good indication it has issues. There are a lot of replacement units on the market for not a lot of money.

To re-emphasize some points made earlier:

Converter/ charger takes 120V shore power to 12VDC. That gizmo came with your trailer when new. It also charges your batteries.

Inverter takes 12V DC to 120V AC. If you have one, it was added at a later date. The trailer did not come with one when new.

With a converter, you get 12V when on shore power and it charges the batteries.

With no inverter, you have no 120V when you unplug from shore power (unless you have a generator).

Bob
uncle_bob is offline   Reply With Quote
Old 07-10-2017, 11:40 AM   #11
3 Rivet Member
 
2017 25' International
Framingham , Massachusetts
Join Date: Oct 2015
Posts: 142
Quote:
Originally Posted by uncle_bob View Post
Hi

If you have the original converter/charger from back in 1977, it may be past it's "use by" date. That's not a terribly uncommon issue on any 40 year old electronic item. If indeed it's putting out a max of 12.7V that's a good indication it has issues. There are a lot of replacement units on the market for not a lot of money.

To re-emphasize some points made earlier:

Converter/ charger takes 120V shore power to 12VDC. That gizmo came with your trailer when new. It also charges your batteries.

Inverter takes 12V DC to 120V AC. If you have one, it was added at a later date. The trailer did not come with one when new.

With a converter, you get 12V when on shore power and it charges the batteries.

With no inverter, you have no 120V when you unplug from shore power (unless you have a generator).

Bob
Important terms to know and understand when describing electrical issues!
quietguy is offline   Reply With Quote
Old 07-10-2017, 12:40 PM   #12
Rivet Master
 
1988 25' Excella
1987 32' Excella
Knoxville , Tennessee
Join Date: Oct 2010
Posts: 5,095
Blog Entries: 1
There is sometimes a switch in front of the gauche on the left side that cuts the converter off. My first guess is you need to look for this switch. If that is not it the breaker that the inverter is on could be blown. And it could be a blown inverter. Another thing it could be is that the use/store switch is in the store position.
Bill M. is offline   Reply With Quote
Old 07-10-2017, 05:06 PM   #13
3 Rivet Member
 
harryk's Avatar
 
2005 31' Classic
Venice , Florida
Join Date: Dec 2013
Posts: 187
Look for a switch on the street side behind the curtains...
harryk is offline   Reply With Quote
Old 05-16-2021, 10:44 AM   #14
2 Rivet Member
 
Clovis , California
Join Date: Aug 2013
Posts: 25
Your Couch should lift up, look underneath on each side if you see metal bars and sometimes 1 large spring the couch will lift up. Replace that Converter! get a multi-stage replacement!
nhaas is offline   Reply With Quote
Reply

Tags
12v


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
Please explain how water pressure works tysonhyatt Plumbing - Systems & Fixtures 14 06-21-2014 06:44 PM
Run fridge on 12v only? KYAirstream Refrigerators 7 07-27-2011 07:09 PM
PO rewired my 12V to run only 110V AirSpleen Electrical - Systems, Generators, Batteries & Solar 3 04-06-2007 01:26 PM
Please explain the Jacobs and MSD ignition systems guy99 Mechanics Corner - Engines, Transmission & More... 9 02-09-2006 07:00 PM
please explain Weight Distribution pinkflamingoes Hitches, Couplers & Balls 13 05-30-2004 01:55 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.



All times are GMT -6. The time now is 11:20 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.