Jayco RV Owners Forum
 


Reply
 
Thread Tools Display Modes
 
Old 10-23-2013, 07:54 PM   #1
Senior Member
 
Join Date: Apr 2011
Location: Southwest Florida
Posts: 748
My Power Converter is Magic

I put 30 amps in and get 60 amps out. I did a search for the difference between a DC and AC amp, but I don't understand the answers.
__________________

OnTheGo is offline   Reply With Quote
Old 10-23-2013, 08:55 PM   #2
Moderator Emeritus
 
Doug's Avatar
 
Join Date: Oct 2012
Location: Cincinnati, Ohio
Posts: 4,762
That is magic. Maybe you have a transformer :-)

Not sure what to say about that. Our resident electron managers will chime in.

Interested in learning what the explanation is for this magic.

Doug
__________________

__________________

Southwest, Ohio
2016 Toyota Tundra SR5, 5.7 V8
2017 Jayco 24RBS
Doug is offline   Reply With Quote
Old 10-23-2013, 09:04 PM   #3
Senior Member
 
Threebutchers's Avatar
 
Join Date: Mar 2013
Location: Planet Earth
Posts: 6,818
Quote:
Originally Posted by Doug View Post
Maybe you have a transformer :-)
BINGO!...through a transformer, voltage is dropped while amperage is increased (at least that's how I remember it)
Threebutchers is offline   Reply With Quote
Old 10-23-2013, 09:06 PM   #4
Senior Member
 
RVhiker's Avatar
 
Join Date: Dec 2010
Posts: 1,253
What makes the magic possible is the voltage that drives each amp. Watts is a measurement of work done and equals Amps times Volts.

30 Amps at 120 volts = 3600 Watts.
60 Amps at 12 volts = 720 Watts.

So a converter that makes 60 Amps DC at 12 volts will consume about 720 Watts (excluding conversion losses) or about 6 Amps at 120 volts (6 x 12 = 720). So you're only using 6 of the available 30 Amps at 120 volts to make 60 Amps of DC power at 12 volts.
__________________
There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.

2011 Jayco 28.5RLS; 2008 Chevy Duramax; Pullrite Superglide Hitch

RVhiker is offline   Reply With Quote
Old 10-23-2013, 09:14 PM   #5
Senior Member
 
VicS1950's Avatar
 
Join Date: Apr 2013
Posts: 517
Quote:
Originally Posted by OnTheGo View Post
I put 30 amps in and get 60 amps out. I did a search for the difference between a DC and AC amp, but I don't understand the answers.
I presume that you mean that it is rated for 30 amps on the 120 volt AC input (seems a bit high) and 60 amps DC (at 12 volts) on the output?

The simple answer is that Power (VA) = Volts x amps.

12 volts DC x 60 amps = 720 volt amps or 720 watts of power.

To get 720 watts of power from a 120 volt AC power source it works out to 6 amps or 120 volts x 6 amps = 720 volt amps.

The higher voltage on the input of your converter needs less amps to do the same work.

That is ignoring many losses and other factors which apply in the real world.

AC power is transmitted over lines on the big transmission towers at voltages like 115 KV (115,000 volts), 230 KV, 345 KV and 750 KV for the very reason that by getting the voltages that high the amps, or current, reduce significantly. To transmit power at the 120 volt AC which you need for use in your home would take very large wire and have significant losses. Just my 2 cents. vic

Edit: I'm a slow typist. What RVHiker said.
VicS1950 is offline   Reply With Quote
Old 10-23-2013, 09:32 PM   #6
Moderator Emeritus
 
Doug's Avatar
 
Join Date: Oct 2012
Location: Cincinnati, Ohio
Posts: 4,762
Quote:
Originally Posted by RVhiker View Post
What makes the magic possible is the voltage that drives each amp. Watts is a measurement of work done and equals Amps times Volts.

30 Amps at 120 volts = 3600 Watts.
60 Amps at 12 volts = 720 Watts.

So a converter that makes 60 Amps DC at 12 volts will consume about 720 Watts (excluding conversion losses) or about 6 Amps at 120 volts (6 x 12 = 720). So you're only using 6 of the available 30 Amps at 120 volts to make 60 Amps of DC power at 12 volts.
Thanks for the explanation.

I learned something new tonight :-)

Best regards,
Doug
__________________

Southwest, Ohio
2016 Toyota Tundra SR5, 5.7 V8
2017 Jayco 24RBS
Doug is offline   Reply With Quote
Old 10-24-2013, 05:40 AM   #7
Senior Member
 
Join Date: Apr 2011
Location: Southwest Florida
Posts: 748
Thank you RVhiker and VicS1950 for your explanations. An internet search informed me an AC and DC amp were the same because they each moved one electron ... . Which is probably true, but to me that was like saying 30 lbs is the same as 60 lbs, and I know better than that.

After the internet search, I told DW I was going to have to count electrons, which is hard to do because they are so small and really quick. She gave me a strange look.
OnTheGo is offline   Reply With Quote
Old 10-24-2013, 07:38 AM   #8
Senior Member
 
VicS1950's Avatar
 
Join Date: Apr 2013
Posts: 517
Quote:
Originally Posted by OnTheGo View Post
... which is hard to do because they are so small and really quick. ...
Yes they are. And they are extremely reliable too.

In my over 40 years of of work as an electrical professional I have never seen an electrical failure. I've dealt with many mechanical failures which prevent the electricity from getting to where needed, or that let it go where it wasn't wanted, but electricity itself will never let you down. It is one of the few constants you can depend upon in life.

vic
VicS1950 is offline   Reply With Quote
Old 10-24-2013, 07:49 AM   #9
Senior Member
 
lx22f/c's Avatar
 
Join Date: Feb 2012
Location: Friendswood
Posts: 917
My Power Converter is Magic

Okay you lost me at Magic..... Lol
Sure is nice of everyone to explain this cause i know just enough about electricity to get my rv plugged in.
lx22f/c is offline   Reply With Quote
Old 10-24-2013, 07:50 AM   #10
Site Team
 
norty1's Avatar
 
Join Date: Jan 2011
Location: Charleston, SC
Posts: 12,056
Yes, if you pay the bill on time!
__________________

__________________
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
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 05:46 PM.


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