Go Back   iRV2 Forums > iRV2.com COMMUNITY FORUMS > Vintage RV's
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 04-28-2011, 05:32 AM   #1
Senior Member
 
tekrsq's Avatar
 
Mid Atlantic Campers
Forest River Owners Club
Join Date: Mar 2011
Location: Richmond, Va
Posts: 240
Battery disconnect on house battery?

Can I put a disconnect on the house battery without screwing up the converter when plugged into 110 v?

The reason I ask: I think my converter may be overcharging the house battery when I'm plugged into 110v. I've had the rig plugged in for the last few weeks while I've been working on it, and I've noticed when I move it, the alternator is charging higher than it should, and when I checked the "panel" it shows the battery at only half charge. I haven't had a chance to put a volt meter on the system yet because of the storms, but I've heard about converters overcharging the house batteries and frying them if plugged in for extended periods. I don't need the 12v battery when plugged in, correct ?
__________________

__________________
'87 Coachmen Leprachuan 27' on Ford E 350 w/ 460 cid, Hedman Headers, dual flowmaster exhaust
tekrsq 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 04-28-2011, 06:48 AM   #2
Senior Member
 
tomwalt's Avatar
 
Tiffin Owners Club
Workhorse Chassis Owner
Join Date: Dec 2010
Location: Northern Virginia
Posts: 1,318
I'm not an expert, my OEM cheap-o converter provides 13+V to the coach when plugged into 110VAC and provides a trickle charge to the house batteries. If I disconnect the batteries, I still have 12VDC in the coach. I don't think this harms anything. I recommend you figure out the 1/2 charge issue raather quickly. A bare bones cheap-o converter doesn't overcharge, just too much constant charging. This constant charging causes battery low water and I must add water to the batteries every couple months. The panel should read full charge when plugged in or the engine is running. The panel showing 1/2 charge is a concern - weak battery or shorted cells. I would disconnect and figure this out soon. I just had a weak house battery explode and I suspect the constant charging and hot weather contributed to the water level going down and pow (see the recent post "Battery be gone").
__________________

__________________
Tom and Amy from Northern Virginia.
2000 Allegro 454/Workhorse P32/TST/Crossfire
Life is a DIY project - enjoy it.
tomwalt is offline   Reply With Quote
Old 04-28-2011, 07:01 PM   #3
Senior Member
 
tekrsq's Avatar
 
Mid Atlantic Campers
Forest River Owners Club
Join Date: Mar 2011
Location: Richmond, Va
Posts: 240
I got a chance to put a volt meter on my batts today. I think I have a bad panel gauge, and possibly a bad battery isolator. Since I'm totally new at this, I still have a lot of research to do. Is there a way to adjust the panel ? Or is there something I can test and/or replace to make it read correctly ?

Here's what I found with the volt meter:
House battery- 12.2v at rest, 12.5v on the shoreline, 16.6v with the engine running (alternator)

Chassis battery- 12.3v at rest, 12.3v on the shoreline, 12.0v with the engine running. I'm a little confused the voltage went down with the engine running.
__________________
'87 Coachmen Leprachuan 27' on Ford E 350 w/ 460 cid, Hedman Headers, dual flowmaster exhaust
tekrsq is offline   Reply With Quote
Old 04-28-2011, 07:52 PM   #4
Senior Member
 
Wanabee FTer's Avatar
 
Gulf Streamers Club
Ford Super Duty Owner
Join Date: Jul 2010
Location: Golden Village Palms, CA
Posts: 1,988
Blog Entries: 12
Quote:
Originally Posted by tekrsq View Post
Here's what I found with the volt meter:
House battery- 12.2v at rest, 12.5v on the shoreline, 16.6v with the engine running (alternator)
The House batteries are being charged quickly by the engine alternator @16.6 volts, but they are not being charged enough by shore power (the converter) @12.5 volts. A full charge on a 12 volt battery is 12.7 volts, charging at 12.5 volts will never fully charge the batteries. Check the converter fuses, output voltage to see if there is a problem there. It also would be a good idea to check your batteries with a hydrometer to see if there are any dead cells.

Quote:
Originally Posted by tekrsq View Post
Chassis battery- 12.3v at rest, 12.3v on the shoreline, 12.0v with the engine running. I'm a little confused the voltage went down with the engine running.
At 12.3v the chassis battery is appx 60% charged. 100% charge would be 12.7 volts.
Because of the high voltage reading from the alternator on the house batteries I would say the alternator is working. The low alt. reading on chassis battery leads me to suspect there is a problem in the battery isolator circuit. See if the MH is equipped with a BIRD (Bi-Directional Isolator Relay Delay) the BIRD charges batteries when either one is being charged. When the coach is being driven, batteries will be charged from the engine's alternator. When the coach is plugged into shore power, batteries will be charged from the converter. If neither battery is being charged, the batteries are fully isolated. The BIRD controller also senses heavy loads on either battery to prevent the wrong battery from being inadvertently discharged.

On my coach the converter charges at 13.6 volts when on shore power, 14.5 volts when running from alternator. MY coach is equipped with a BIRD.
The other suggestion I have is to physically inspect all of your ground connections in and around the battery circuit.

One more thing, the alternator gauge on the dash reading high and voltage reading over 16 volts could mean the alternators built in voltage regulator is faulty.

If your coach has a Bird it looks like this...
Attached Thumbnails
Click image for larger version

Name:	BIRD1.jpg
Views:	86
Size:	120.8 KB
ID:	9929  
__________________
John
'98 Gulf Stream Sunsport 325, 7.5L Banks Power Pack, Koni FSD's, Air Bags, ReadyBrute Elite,
2000 Honda Accord

Wanabee FTer 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
MH converter charge both house AN engine battery? Gary - K7GLD Vintage RV's 12 02-27-2011 01:32 PM
6v House battery conversion McDanie1 Newmar Owner's Forum 18 07-13-2009 07:45 AM
My twin house battery set-up. fleamarketer Vintage RV's 3 04-10-2009 11:56 PM
House battery disconnect Dave&Kacy Alpine Coach Owner's Forum 5 09-13-2008 09:54 PM
Installation of a Battery Disconnect Switch SteveG Winnebago Industries Owner's Forum 7 07-09-2007 07:53 AM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:40 PM.


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