Jayco RV Owners Forum
 


View Poll Results: Autotransformer use: Good or Bad?
Good 8 80.00%
Bad 2 20.00%
Voters: 10. You may not vote on this poll

Reply
 
Thread Tools Display Modes
 
Old 11-11-2015, 08:09 PM   #1
Senior Member
 
hoppers4's Avatar
 
Join Date: Mar 2015
Location: Port Orchard
Posts: 1,167
Autotransformers: Good or Bad?

I'm considering getting an autotransformer to protect my A/C in campgrounds with inadequate wiring/low voltage at the post. This is a good thing for my A/C but not such a good thing for my neighbors on the same circuit. So, what's your opinion of autotransformer use?

Here's a link to one opinion Autotransformer Use: "Stealing Power?"
__________________

__________________
Don
hoppers4 is offline   Reply With Quote
Old 11-11-2015, 08:37 PM   #2
Site Team
 
norty1's Avatar
 
Join Date: Jan 2011
Location: Charleston, SC
Posts: 12,047
Autotransformers: Good or Bad?

I have been in CG's that had posted signs prohibiting them.
I have never been in a CG where I needed one and my EMS would shut off the supply of the voltage got to low.
Un necessary expense IMO.
__________________

__________________
Moderator
2011 351RLTS Eagle, Mor/Ryde suspension & pin box
06 F350 Lariat PSD, SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS

Can't find what you're looking on JOF? Try:Jayco Owners Forum Custom Google Search
"It's easier to fool people than to convince them that they have been fooled." - Mark Twain
norty1 is offline   Reply With Quote
Old 11-11-2015, 08:49 PM   #3
Senior Member
 
Join Date: Feb 2014
Location: MD
Posts: 3,087
Yep a Progressive Industries EMS would shut the power off in a low voltage situation and protect your AC.
__________________
2017 JayFlight 28BHBE
2014 JayFlight Swift 264BH (Sold)
2007 GMC 2500 Sierra Classic Crew Cab LBZ Duramax / 6spd Allison
SouthCo is offline   Reply With Quote
Old 11-11-2015, 08:56 PM   #4
Senior Member
 
hoppers4's Avatar
 
Join Date: Mar 2015
Location: Port Orchard
Posts: 1,167
Actually what I'm interested in is not an EMS but an autotransformer. An autotransformer will kick your voltage up by 10% when the post voltage drops below 117VAC. However, because it steps your voltage up and you draw more current, the other posts on the same circuit will lose a small amount of voltage due to line loss from the campground feed for that circuit.

An autotransformer would allow me to keep using my A/C in a low voltage situation whereas an EMS would not. I've been in campgrounds where I've seen the voltage drop to 106VAC and I was really concerned about my A/C.
__________________
Don
hoppers4 is offline   Reply With Quote
Old 11-11-2015, 09:21 PM   #5
Senior Member
 
BigJohnD's Avatar
 
Join Date: Nov 2014
Location: Florien, LA
Posts: 1,709
I have one. Frank's autoformer for 50 amp. I pretty much never use it. Hadn't in a few years. BUT, you bet I would if I needed to. Lost an AC In our first rig due to low voltage, so never again. Auoformer is cheaper than AC. I have the EMS also, but your dead in the water if low voltage, unless you have an autoformer.
__________________
John and Rebecca Dickson
Emma-9 / Little John-6 / Iva-2
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)
BigJohnD is offline   Reply With Quote
Old 11-11-2015, 09:46 PM   #6
Senior Member
 
hoppers4's Avatar
 
Join Date: Mar 2015
Location: Port Orchard
Posts: 1,167
BigJohn, that's interesting that you haven't had to use it for years. I was in several this June (cross country trip using quite a few KOAs) and also a couple the year before that had low voltage. Perhaps I just need to use better campgrounds.
__________________
Don
hoppers4 is offline   Reply With Quote
Old 11-11-2015, 10:04 PM   #7
Senior Member
 
BigJohnD's Avatar
 
Join Date: Nov 2014
Location: Florien, LA
Posts: 1,709
hoppers4, not sure. Oddly enough, both the parks we experienced low voltage in were in the same area. Lost the AC in one of them. We've used it a few times here and there, but in the last few years all has been well between voltage monitors and ems. Run of luck I guess.
__________________
John and Rebecca Dickson
Emma-9 / Little John-6 / Iva-2
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)
BigJohnD is offline   Reply With Quote
Old 11-12-2015, 03:53 AM   #8
Senior Member
 
tnchuck100's Avatar
 
Join Date: Jun 2012
Location: Sparta, TN
Posts: 1,174
They are GOOD!

I have one. I have used it once. I am glad I have it and will use it whenever necessary.

Stealing power? That is a statement made by people who do not understand electricity. The electric distribution system has regulators at the substations and throughout the system. They ARE, in fact, auto-formers. Big ones!

Yes, you will draw slightly more power from the pedestal after including your auto-former but at the same time your air conditioner is running more efficiently on the increased voltage. Almost a wash. But you are NOT "stealing power". Read the last paragraph in the OP's article link.
__________________
Chuck - Sparta, TN
2012 Jay Flight 22FB, 2 x Honda EU2000i
2013 GMC Yukon XL Denali AWD

EDUCATION is what you get when you read the fine print.....
EXPERIENCE is what you get when you don't.
tnchuck100 is offline   Reply With Quote
Old 11-12-2015, 09:37 AM   #9
Senior Member
 
hoppers4's Avatar
 
Join Date: Mar 2015
Location: Port Orchard
Posts: 1,167
That's kinda the way I was thinking Chuck. I have a pretty good grip on the I/V/P relationship and have a hard time viewing it as stealing. I have an even harder time shutting off my A/C when it's really hot out or worse yet burning it up because of inadequate infrastructure.
__________________
Don
hoppers4 is offline   Reply With Quote
Old 11-13-2015, 09:14 AM   #10
Senior Member
 
VicS1950's Avatar
 
Join Date: Apr 2013
Posts: 517
Curious.

I'm familiar with autotransformers and step transformers in power distribution. I'm not at all familiar with autotransformers intended for RV use. Are most units a fixed 10% or is it common to have non-load tap changing to closer trim in the voltage? I suspect multiple taps would add cost to the manufacturer so they aren't common.

An aside. The article cited above declared that most RV loads are resisitve. I disagree in that the large percentage of power used is for air conditioning, fans, refrigeration compressors, inverter/chargers, etc. I wouldn't consider those loads resistive. Even though the traditional 12 volt interior lamps are resisitve, when connected to shore power they are powered by the inverter/charger.

FWIW. vic
__________________

VicS1950 is offline   Reply With Quote
Reply

Thread Tools
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


» Virginia State Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -6. The time now is 04:21 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2002-2016 Social Knowledge, LLC All Rights Reserved.