Reply
 
Thread Tools Search this Thread Display Modes
 
Old 10-18-2015, 05:29 PM   #1
3 Rivet Member
 
1972 27' Overlander
Woodburn , Oregon
Join Date: Apr 2015
Posts: 130
Univolt why so heavy ?

I just removed the old univolt in my 1972 overlander and when I went to lift it out it really made me grunt, it must weigh over 60 lbs , I was wondering what's inside one of these old Bruts that make them so heavy ? I'm really curious 🇨🇱
__________________

__________________
shineybullet is offline   Reply With Quote
Old 10-18-2015, 05:32 PM   #2
3 Rivet Member
 
Join Date: Feb 2004
Posts: 247
Images: 3
Because of the transformer that's in it for conversion
__________________

__________________
0557 is offline   Reply With Quote
Old 10-18-2015, 06:31 PM   #3
Rivet Master
 
1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
Join Date: Jul 2009
Posts: 4,591
Prior to switching power supplies about the only way to convert voltage was with a transformer. In this case a big heavy one.

Electronics changed all of that, but transformer systems are still simple, very reliable and easy to understand. But the old Univolt is simply obsolete as a converter/charger system.
__________________
idroba is offline   Reply With Quote
Old 10-18-2015, 07:19 PM   #4
Rivet Master
 
AWCHIEF's Avatar
 
2006 23' Safari SE
Biloxi , Mississippi
Join Date: Nov 2011
Posts: 8,049
Images: 33
Good old solid American made steel and iron. Almost bullet proof and make great boat anchors.
__________________
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."
AWCHIEF is offline   Reply With Quote
Old 10-18-2015, 08:34 PM   #5
4 Rivet Member
 
DryFly's Avatar
 
1972 Argosy 20
Snoqualmie , Washington
Join Date: Sep 2012
Posts: 411
The reason it's so heavy is because it's got A LOT of copper for the windings. Take it apart and you'll see. Most of it can be recycled.
__________________
DryFly is offline   Reply With Quote
Old 10-18-2015, 09:22 PM   #6
Rivet Master
 
Currently Looking...
Mission , Texas
Join Date: Jun 2015
Posts: 836
... wondering outloud why I didn't remove ours when I had the bathroom partially disassembled to replace the shower valve and plumbing ...
__________________
nrgtrakr is offline   Reply With Quote
Old 10-18-2015, 09:24 PM   #7
Maniacal Engineer
 
barts's Avatar
 
1971 25' Tradewind
Menlo Park , California
Join Date: Jan 2010
Posts: 1,220
Images: 1
Blog Entries: 4
The size of a transformer is inversely related to the frequency for which it's designed... so a switching mode power supply that runs at 20+khz will have a much smaller transformer than a 60hz model.

In the end, the ferroresonant Univolts are prob. more reliable than the
switching supplies that have replaced them - but the new units are much cheaper, more efficient and quieter. The new systems also provide for temperature adjusted charging voltages, and the three-stage systems won't cook your batteries, either.

- Bart
__________________
Bart Smaalders
Menlo Park, CA
http://tinpickle.blogspot.com
http://smaalders.net/barts
barts is offline   Reply With Quote
Old 10-18-2015, 09:40 PM   #8
cwf
Rivet Master
 
cwf's Avatar
 
1999 34' Excella
Currently Looking...
Hillsboro , Texas
Join Date: Feb 2013
Posts: 5,905
Images: 2
They are far lighter when you let out the "magic smoke"!
Attached Thumbnails
Click image for larger version

Name:	image.jpeg
Views:	67
Size:	50.2 KB
ID:	250628  
__________________
Peace and Blessings..
Channing
WBCCI# 30676
cwf is offline   Reply With Quote
Old 10-18-2015, 10:28 PM   #9
3 Rivet Member
 
1972 27' Overlander
Woodburn , Oregon
Join Date: Apr 2015
Posts: 130
Quote:
Originally Posted by barts View Post
The size of a transformer is inversely related to the frequency for which it's designed... so a switching mode power supply that runs at 20+khz will have a much smaller transformer than a 60hz model.

In the end, the ferroresonant Univolts are prob. more reliable than the
switching supplies that have replaced them - but the new units are much cheaper, more efficient and quieter. The new systems also provide for temperature adjusted charging voltages, and the three-stage systems won't cook your batteries, either.

- Bart
It looks like mine must have quit working years ago,some pasr owner cut off its power cord to the Uni volt and wired a small battery charger in its place I'm putting in a 45 amp smart converter in its place with 2 huge 12 volt yellow top batteries
__________________
shineybullet is offline   Reply With Quote
Old 10-19-2015, 11:01 AM   #10
3 Rivet Member
 
Currently Looking...
belen , New Mexico
Join Date: Jan 2012
Posts: 163
1st one I replaced was in my 77 ambassador (in1999) and it was suddenly sooo quiet!
__________________
alantbird is offline   Reply With Quote
Old 10-19-2015, 12:13 PM   #11
Rivet Master
 
Royce's Avatar
 
1977 Argosy Minuet 6.0 Metre
Colorado Springs , Colorado
Join Date: Dec 2003
Posts: 713
Images: 9
I gave mine to a local HAM radio operator. He changed it to an oil filled unit and is happy to give it a new home. I was happy to get the 75 or so lbs out and a new quiet converter in.
__________________
Royce (K0RKK) 146.460 simplex
Web page http://spearfishcreek.net/
AIR# 3913
'77' Minuet 6 Metre, behind a 2005 stock Jeep Rubicon with Equa-L-Zer hitch.
Royce is offline   Reply With Quote
Old 10-19-2015, 03:11 PM   #12
2 Rivet Member
 
1974 Argosy 26
Joshua Tree , California
Join Date: Feb 2015
Posts: 35
NRGTRKR: thanks for the confirming word. I still have our bathroom and closet apart for plumbing replacement. Might as well jump into that too!
__________________
StarckMad is offline   Reply With Quote
Old 10-19-2015, 04:32 PM   #13
Rivet Master
 
Currently Looking...
Mission , Texas
Join Date: Jun 2015
Posts: 836
Hahahaa!!!
Anytime ...
I wonder if it will fit through the battery box door if the battery compartment liner is removed?
I like our AS, but wonder about space utilization at times.
__________________
nrgtrakr is offline   Reply With Quote
Old 10-19-2015, 04:51 PM   #14
Wise Elder
 
Jammer's Avatar
 
2010 30' Classic
Vintage Kin Owner
South of the river , Minnesota
Join Date: Dec 2009
Posts: 4,112
I believe that the early univolts were ferroresonant, which added to their weight.

Ferroresonant transformers provide a measure of passive voltage regulation, and were a reasonably common design choice before high power MOS devices were available.
__________________

__________________
To learn to see below the surface, you must adjust your altitude
Jammer 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
Why is my 1979 so heavy? KYAirstream Towing, Tow Vehicles & Hitches 23 08-23-2015 07:32 PM
To Univolt or NOT Univolt? aircooled4 Batteries, Univolts, Converters & Inverters 11 05-13-2012 07:20 PM
why new 34' so heavy- 2007 Classic? boondockdad 2006 - 2010 Classic (all lengths) 6 06-21-2007 03:17 PM
why would the univolt boil the batteries dry silver 67 Electrical - Systems, Generators, Batteries & Solar 11 07-08-2005 03:20 AM
Why, Why, Why aviontt On The Road... 22 11-20-2003 07:41 PM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 04:24 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.