Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Newmar Owner's Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  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 06-17-2021, 10:30 AM   #1
Senior Member

Join Date: Sep 2016
Posts: 537
Electrical issue

Evey now and then, when there is a large electrical load, the ceiling lights will flicker and the voltage will drop to 10.1 volts on the panel in the front overhead cabinet. Then it bounces back to 12.6 volts. During the low voltage, the inverter switches to inverting. When the load drops, the inverter goes back to float charging.
Every month I check the house batteries, clean up the posts and add distilled water as required.
I'm thinking (which gets me in trouble) there's a continuity problem with the battery cables. I've seen cables corrode under the insulation. Would bad battery cables cause the problem I'm having? Or is it something else.
I'm open to any suggestions. TIA
John & Deb
Full Time since 2016
2016 Dutch Star 4369
Webz is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free! 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 06-17-2021, 10:58 AM   #2
Senior Member
Damon Owners Club
Join Date: Apr 2020
Posts: 2,303
Blog Entries: 3
When the inverter switches to inverting, it indicates that you lost 120VAC to the inverter, which may explain why the DC system voltage takes a big hit, because the inverter is now providing all your AC requirements. I'd be looking at the ATS for loose connections or damaged contacts, of course only with all the power disconnected.
2006 Damon Daybreak 3276 35'with 5 Star Tuner. 3 200 Amp Lithium batteries and 2000 watt PSW inverter/charger. 2013 Elantra on a Master Tow dolly.
Retired AF
HarryStone is offline   Reply With Quote
Old 06-17-2021, 11:51 AM   #3
Senior Member
Join Date: Aug 2017
Location: St. Louis, MO
Posts: 335
- Usually the problem turns out to be something other than what you first suspected
- the problem could be an intermittent open in a battery, an intermittent inverter issue, a bad AC circuit breaker, a poor wire termination somewhere, the main 300a fuse breaking down, etc
- So if it were me, I would start at the batteries and check everything on the DC side and start at shore power & check every thing on the AC side
- I agree with the prior post that the AC side might be the source
- regarding under the insulation - on a DC cable under the insulation is just a large wire. unless the wire is broken in two under the insulation, if there were corrosion it shouldn't cause a problem. I've never seen corrosion under the insulation on a wire. It is possible that there could be corrosion at a connection point, for example where a wire is crimped into a lug at the end.
-corrosion = bad connection = heat if you have a bad connection that point should get hot. you could feel the connection points to look for heat.
- I'd look for a loose connection
- it could be the inverter. you could remove and bypass the inverter then send it to the vendors depot, e.g. Xantrex has 4 major depots, I've had them check mine and send it back no charge except shipping
- in industry we survey equipment with a heat gun, if you have a temperature thermometer scanner gun/tool you could scan the breakers and terminations for hot spot.
- the pedestal circuit breaker regularly cause trouble as they are not intended to be switches unless they are bought as SWD switching duty which you rarely see. The internal contacts get pitted and cause a poor connection.
just some thoughts

swduns is offline   Reply With Quote
Old 06-17-2021, 12:03 PM   #4
Senior Member
Skip426's Avatar

Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 24,337
At 10.1 volts of available power the inverter , shouldn't be trying to invert , it should be giving a low battery warning .
Inverter float charge should be higher than 12.6 volts ; 13>13.2 would be normal.
Have you had your batteries load tested ?
Disconnected them from each other and done a voltage test ?
The condition you describe , sounds more like the inverter's internal charging circuit is shutting down due to an overheat condition ( possibly from trying to charge a bad battery ) then restarting after a cool down period.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is online now   Reply With Quote

electric, electrical

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
No electrical power at one lug (3) Left Front Electrical Center RobRoy Monaco Owner's Forum 18 03-31-2017 11:59 AM
Southwind 36D Issue after issue after issue.... fixn2gocamp Fleetwood Owner's Forum 4 10-21-2009 07:05 PM
electrical issue...maybe Gdlow MH-General Discussions & Problems 6 07-18-2008 04:57 AM
GFCI Electrical Issue Roam America 5th Wheel Discussion 2 06-04-2008 10:31 AM
breaker- electrical issue 2racer RV Systems & Appliances 5 10-02-2007 04:03 AM

» Featured Campgrounds

Reviews provided by

All times are GMT -6. The time now is 10:46 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.