Reply
 
Thread Tools Search this Thread Display Modes
 
Old 01-07-2009, 06:15 PM   #1
2 Rivet Member
 
scotta's Avatar
 
1995 33' Land Yacht
Lubbock , Texas
Join Date: Mar 2002
Posts: 46
Replacing DC TV with AC TV

I have disconnected the dc jack connected those wires to a 400 w 2 socket inverter in the bedroom. The inverter reads 12 volts in , o power out and 115 volts power. When I plug in the TV the inverter shuts off. What do think Ithe problem is? ANy help is much appreciated.
__________________

__________________
Scotta - 1995 Land Yacht 33' , Chevy 454, Banks Power System, Bilstein Shocks, Safe Steer Stabilizer, 2004 Land Rover Discovery.
scotta is offline   Reply With Quote
Old 01-07-2009, 08:04 PM   #2
Rivet Master
 
jdalrymple's Avatar
 
2009 27' FB Flying Cloud
1991 35' Airstream 350
Jay , Oklahoma
Join Date: Oct 2006
Posts: 1,602
Several ideas..

Does the TV draw more than 400 watts?

Wiring in the wall from the removed 12 volt receptacle may be insufficient to supply the inverter.

I would research the TVís power requirements and it is rated under 400 watts, I would connect the inverter directly to a the battery and see what happens.

Best of luck,
__________________

__________________
Jeff & Cindy
'09 27FB Flying Cloud
'91 350 LE MH
jdalrymple is offline   Reply With Quote
Old 01-07-2009, 08:54 PM   #3
Rivet Master
 
Jim Foster's Avatar
 
1965 17' Caravel
1983 27' Excella
Walnut Grove/Laguna Woods , California
Join Date: Jun 2004
Posts: 1,615
Send a message via Yahoo to Jim Foster
It sounds like your inverter is overloaded. Either the TV draws more than the inverter can supply, or the 12v wiring to the inverter is not sufficient, or both. The wiring to a 12v cigarette plug is usually 12 or 14 guage, 10 gauge at the most. None of this is heavy enough for a 12v DC to 120v AC inverter.

When I wired my inverter, I went to a parts house and got a cheap set of jumper cables, cut off the clips, added good connectors and went straight from the batteries to the inverter. It loves it.
__________________
Jim Foster is offline   Reply With Quote
Old 01-07-2009, 10:10 PM   #4
4 Rivet Member
 
bibbs's Avatar
 
1977 Argosy Minuet 6.0 Metre
1973 21' Globetrotter
1975 26' Argosy 26
Vista , California
Join Date: Sep 2006
Posts: 265
your 12 volt feed wires are too small 400 watts at 12 volts needs at least

#8 wire. I found out the same thing when I hooked up my 1000w espresso

maker,I had a 2000 watt inverter I needed to run 1/0.

12 volts @400 watts=33.3 amps round up to 40amps=#8wire size For a short

distance to the battery

bibbs
__________________
bibbs is offline   Reply With Quote
Old 01-07-2009, 10:40 PM   #5
2 Rivet Member
 
scotta's Avatar
 
1995 33' Land Yacht
Lubbock , Texas
Join Date: Mar 2002
Posts: 46
Quote:
Originally Posted by jdalrymple View Post
Several ideas..

Does the TV draw more than 400 watts?

Wiring in the wall from the removed 12 volt receptacle may be insufficient to supply the inverter.

I would research the TVís power requirements and it is rated under 400 watts, I would connect the inverter directly to a the battery and see what happens.

Best of luck,
TV draws 80 watts. How do run a heavier wire all the way to the battery as others have suggested?
__________________
Scotta - 1995 Land Yacht 33' , Chevy 454, Banks Power System, Bilstein Shocks, Safe Steer Stabilizer, 2004 Land Rover Discovery.
scotta is offline   Reply With Quote
Old 01-07-2009, 10:48 PM   #6
2 Rivet Member
 
scotta's Avatar
 
1995 33' Land Yacht
Lubbock , Texas
Join Date: Mar 2002
Posts: 46
Quote:
Originally Posted by bibbs View Post
your 12 volt feed wires are too small 400 watts at 12 volts needs at least

#8 wire. I found out the same thing when I hooked up my 1000w espresso

maker,I had a 2000 watt inverter I needed to run 1/0.

12 volts @400 watts=33.3 amps round up to 40amps=#8wire size For a short

distance to the battery

bibbs
If the TV only draws 80 watts; would I be better off with a smaller inverter, say 150 watts? Would the existing wiring operate the inverter or would I still need to run larger gauge wire all the way to the battery? I could order another TV that is AC/DC but they cost much more than the straight AC TV I bought on sale over the holidays. I have no idea on how to run wire to the battery.
__________________
Scotta - 1995 Land Yacht 33' , Chevy 454, Banks Power System, Bilstein Shocks, Safe Steer Stabilizer, 2004 Land Rover Discovery.
scotta is offline   Reply With Quote
Old 01-08-2009, 12:09 AM   #7
Rivet Master
 
1975 29' Ambassador
Reno , Nevada
Join Date: May 2003
Posts: 1,351
The 400 watt inverter should do just fine and might be more efficient at 80 watts than a smaller one.

If voltage drop to the inverter is the problem, you can check by temporarily connecting the inverter directly to the battery and then plug in the TV or a similar load. If that works then you should connect a 12v load of about 7 amps to your 12v source in the bedroom and see what kind of voltage drop you have. 7 amps is like a couple of lighting fixtures using the 1183 incandescent 12v bulbs or an auto headlight.

If you can get 7 or 8 amps out of the bedroom 12v source without dropping below 11.5 v you should be OK - check the inverter manual for its low battery cutoff voltage. That is usually 10.5v or so.

If you are suffering voltage drops on the 12v line in the bedroom and AC/DC tv isn't really going to help. That drop represents a power loss that will happen either way. A 1v drop on an 80 watt load is going to represent almost 7 watts power loss. This is why it is always better to have the inverter close to the battery and run 110v lines to the load as that 80 watt load will then represent only 3/4 of an amp rather than 7 amps and the power loss is related to the square of the current.

It is also worth noting that a DVD movie is an easy way to run a battery down. Most TV's, even LCD's, will use more than 100 watts and a solid 10 amp drain on a battery runs them down in a hurry.
__________________
bryanl is offline   Reply With Quote
Old 01-08-2009, 12:00 PM   #8
2 Rivet Member
 
scotta's Avatar
 
1995 33' Land Yacht
Lubbock , Texas
Join Date: Mar 2002
Posts: 46
Quote:
Originally Posted by Leipper View Post
The 400 watt inverter should do just fine and might be more efficient at 80 watts than a smaller one.

If voltage drop to the inverter is the problem, you can check by temporarily connecting the inverter directly to the battery and then plug in the TV or a similar load. If that works then you should connect a 12v load of about 7 amps to your 12v source in the bedroom and see what kind of voltage drop you have. 7 amps is like a couple of lighting fixtures using the 1183 incandescent 12v bulbs or an auto headlight.

If you can get 7 or 8 amps out of the bedroom 12v source without dropping below 11.5 v you should be OK - check the inverter manual for its low battery cutoff voltage. That is usually 10.5v or so.

If you are suffering voltage drops on the 12v line in the bedroom and AC/DC tv isn't really going to help. That drop represents a power loss that will happen either way. A 1v drop on an 80 watt load is going to represent almost 7 watts power loss. This is why it is always better to have the inverter close to the battery and run 110v lines to the load as that 80 watt load will then represent only 3/4 of an amp rather than 7 amps and the power loss is related to the square of the current.

It is also worth noting that a DVD movie is an easy way to run a battery down. Most TV's, even LCD's, will use more than 100 watts and a solid 10 amp drain on a battery runs them down in a hurry.

The lights in the bedroom are connected to the same switch as the power to the TV. So I am trying to power the TV and the overhead fluorescent light as well as the two reading lights on either side of the headboard. In reading your post it makes me think this may be the problem. I am really ignorant when it comes to electricity or any mechanical stuff. I admire people like you who have those skills. I do know contract Law if I can ever help you though :-)
__________________

__________________
Scotta - 1995 Land Yacht 33' , Chevy 454, Banks Power System, Bilstein Shocks, Safe Steer Stabilizer, 2004 Land Rover Discovery.
scotta 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
Replacing antenna ckeysor 1984 - 1989 Sovereign 5 07-14-2008 07:22 PM
Replacing the NT22a with an SF-20 Anyone done this Thealt Furnaces, Heaters, Fireplaces & Air Conditioning 5 02-04-2008 12:18 AM
Help with replacing Fridge danesh Refrigerators 1 06-22-2007 05:53 PM
Replacing Tambour davespann Cabinets, Counter Tops & Furnishings 7 09-09-2003 09:38 PM
? On Replacing Cabinets tiniree Cabinets, Counter Tops & Furnishings 2 04-21-2003 01:16 PM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 07:00 AM.


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.