Go Back   iRV2 Forums > MOTORHOME FORUMS > MH-General Discussions & Problems
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 01-21-2015, 10:03 AM   #15
Senior Member
 
Join Date: Feb 2010
Posts: 4,493
Look for a filter cap to connect across the dc supply at the amp.

Also look for a torroid coil to loop power wires between cap and power connection.

Since you stated all inputs disconnected then you may not have ground loop unless a speaker wire is touching but instead maybe a poor design in the amp assuming all power supply filtering performed by adaptor and it is amplifying the ripple effect from power source.
__________________

__________________
Tony & Lori
1989 Country Coach Savannah SE
TQ60 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 01-21-2015, 11:19 AM   #16
Senior Member
 
wa8yxm's Avatar
 
Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 22,822
I will ask again, is the inverter a TSW or an MSW type..

What you have is most likely common-mode interference, Since both the inverter and the radio are sucking power from the same source, I'd suspect the power line before I suspecrted the ground pin.

HOWEVER, since it is an inverter.. Safety ground is basically useless, UNLESS... it is a pass through device (Inline type)

Inverters come in two types (Times two times many) for this discussion

Inline, where power comes in when you have it, and charges the batteries, and then when the external source is lost, power comes from the batteries.

And Stand alone (12 volt in, 120 volt out, no other option)

IF it is a stand alone you can safely LIFT the ground pin using one of the 3-wire to 2-wire plug adapters if you wish.

If it is a pass through. DO NOT DO THIS.

I won't go into the reasons for this here, but it has been covered in many other threads on Generators. Same things apply.

But I think what you have is common mode interference.. You can get a brute force filter that will reduce it but at 60/120/180 HZ, well, that's hard to block. Alternator whine is easier to block.
__________________

__________________
Home is where I park it!
wa8yxm is offline   Reply With Quote
Old 01-21-2015, 12:36 PM   #17
Senior Member
 
Join Date: Nov 2014
Location: TEJAS
Posts: 417
I found out the hard way, (blew) a Xantrex msw inverter. If the Tripplite is built like the Xantrex, than the neutral and ground are isolated. This is unlike a normal electrical supply. Somewhere in the mix there is a connection of the neutral and ground. In a house it is in the main panel and in my coach I believe it is the gen. Here is the problem, the msw inverters typically have power on the neutral AND the hot. You can't ground the neutral and if you do it goes BOOM. So, you most likely have noise injected somewhere (loop) because the neutral is active!
__________________
spyderRV is offline   Reply With Quote
Old 01-21-2015, 01:10 PM   #18
Senior Member
 
bruceisla's Avatar
 
Join Date: Oct 2012
Location: St. Lucie West, FL
Posts: 5,129
Quote:
Originally Posted by wa8yxm View Post

What you have is most likely common-mode interference, Since both the inverter and the radio are sucking power from the same source, I'd suspect the power line before I suspecrted the ground pin.
I think what you are suggesting is ripple (noise) on the 12vdc line ... I'm inclined to agree. Tough to see without a scope but the OP might try using a decent meter set on the AC lowest scale across the 12vdc inverter output and then compare to the battery 12vdc output (inverter turned off).

I'm not sure whether the OP has/had a transfer switch for shore power and whether it is still in the mix (for ground).

I'm also not sure whether this RV has a 12vdc dash radio/receiver and how that is working.
__________________
2005 Newmar Essex 4502, 2013 Caddy SRX
1997 HR Endeavor 37, CAT, 1996 Geo Tracker
bruceisla is online now   Reply With Quote
Old 01-22-2015, 12:52 AM   #19
Senior Member
 
wanderso's Avatar
 
Fleetwood Owners Club
Join Date: Nov 2011
Posts: 1,045
On the question of modified sine wave on the tripplite, I have a lower wattage version of your same inverter that was installed by Chinook (my RV mfg). Folks seem to speak of the evils of modified sine wave but I can attest that mine works just fine with a DVD player/home theater combo with amp and subwoofer and a Vizio flat screen TV. No ground loop noise and great picture and sound when running on shore power, generator, or inverter.

Unless it is defective, there's nothing wrong with the quality of these tripplite inverters. Truckers have been using them for years as well.

On your audio setup, are any of the devices using a 3 prong plug? I predict that your amp is 2 prong. If so (3prong) and if they are connected to your amp, that may well also be where the loop lies or in the two grounds you mention. At home, I have a digital projector that is on a 3 prong plug while my amp is a 2 prong. If I plug them into the same power strip, it's usually not an issue. Same holds true of course if I remove the 3rd prong from the projector. The wire connection between the two (hdmi) allows for the loop problem when connected to different branch circuits. Before folks say my home wiring is screwed up, I have this issue wherever I take this setup, including commercial buildings. Of interest is that a different brand of audio amp that I also own does not exhibit the same issue. Have you tested a different amp?

I wonder also if you have a corroded chassis ground issue in the generator compartment or elsewhere. I count several chassis / frame rail grounds in my RV.

Don't know if this is of value in your troubleshooting but perhaps it is.
__________________
History: '08 View, '05 Chinook, '01 Jamboree 24D, '78 Apache Popup, 81 Komfort Tlr,
84 Mazda B2000 'w canopy,
Tent from wedding shower in '96
wanderso is offline   Reply With Quote
Old 01-24-2015, 01:58 PM   #20
Junior Member
 
Join Date: Jan 2014
Posts: 15
Quote:
Originally Posted by wa8yxm View Post
I will ask again, is the inverter a TSW or an MSW type..

What you have is most likely common-mode interference, Since both the inverter and the radio are sucking power from the same source, I'd suspect the power line before I suspecrted the ground pin.

HOWEVER, since it is an inverter.. Safety ground is basically useless, UNLESS... it is a pass through device (Inline type)

Inverters come in two types (Times two times many) for this discussion

Inline, where power comes in when you have it, and charges the batteries, and then when the external source is lost, power comes from the batteries.

And Stand alone (12 volt in, 120 volt out, no other option)

IF it is a stand alone you can safely LIFT the ground pin using one of the 3-wire to 2-wire plug adapters if you wish.

If it is a pass through. DO NOT DO THIS.

I won't go into the reasons for this here, but it has been covered in many other threads on Generators. Same things apply.

But I think what you have is common mode interference.. You can get a brute force filter that will reduce it but at 60/120/180 HZ, well, that's hard to block. Alternator whine is easier to block.
Thank you very much for your response. On post #4 i reply with the information and a link to the factory website of my actual inverter. It is a stand alone MSW inverter.
__________________

__________________
crosby716 is offline   Reply With Quote
Reply

Tags
inverter, wiring



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
SquaLor on inverter rogelling Entegra Owner's Forum 2 08-04-2014 02:17 PM
Solar Power - Generator - Inverter Question Rossi6998 Boondocking 7 03-09-2014 01:06 PM
Inverter or coach wiring diagram 2000 HR Endeavor jimbo2013 Monaco Owner's Forum 1 12-26-2013 03:05 PM
Full Time TV on Inverter max49 Technology: Internet, TV, Satellite, Cell Phones, etc. 18 12-23-2013 09:37 PM
Inverter question 93 Safari Continental ollison RV Systems & Appliances 10 11-20-2013 06:39 AM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 06:57 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.