Go Back   iRV2 Forums > TRAVEL TRAILER, 5th WHEEL & TRUCK CAMPER FORUMS > Travel Trailer Discussion
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 03-14-2016, 10:30 AM   #29
Senior Member
 
dagmandt's Avatar
 
Outdoors RV Owners Club
Join Date: Feb 2013
Location: Auburn, WA
Posts: 427
I happen to be equipped to test this out and did just that yesterday. I have a trimetric and a video camera, that is all that was needed.

Battery resting voltage: 12.5v which has a little use on it.
Trailer hooked up at idle: 12.9v
Hauling the trailer at 65mph: 13.4v

So, there ya have it, as I predicted you will get a trickle charge while driving which is great for keeping an already charged battery topped off. If you rely on this solely you will greatly reduce your battery life. Charging fully before leaving or after arriving with a charger/generator would be the right thing to do for good battery life.
Darren
__________________

__________________
TV: 2012 Ford F350 CC 6.7L 4x4
TT: 2014 Wind River 250RDSW [Dual Crown 6v, Trimetric, Iota 15.4v 55A charger]
dagmandt 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 03-14-2016, 10:35 AM   #30
Senior Member
 
BrianGlenn's Avatar


 
Country Coach Owners Club
Join Date: Apr 2015
Location: Alberta
Posts: 897
Quote:
Originally Posted by dagmandt View Post
I happen to be equipped to test this out and did just that yesterday. I have a trimetric and a video camera, that is all that was needed.

Battery resting voltage: 12.5v which has a little use on it.
Trailer hooked up at idle: 12.9v
Hauling the trailer at 65mph: 13.4v

So, there ya have it, as I predicted you will get a trickle charge while driving which is great for keeping an already charged battery topped off. If you rely on this solely you will greatly reduce your battery life. Charging fully before leaving or after arriving with a charger/generator would be the right thing to do for good battery life.
Darren
Does your trimetric show instantaneous amperage, positive while charging? Did you record this at 65 mph? Curious.....

Brian
__________________

__________________
Towr: 2007 Country Coach Allure 470 - 37 Sunset Bay Cummins 400 ISL
Toad: 2016 F150 King Ranch - 3.5L EcoBoost 4x4 Supercrew (curb weight 4,775 lbs)
Toad: SOLD 2007 Jeep Grand Cherokee (yes, it has a Hemi) (curb weight 4,720 lbs)
BrianGlenn is offline   Reply With Quote
Old 03-14-2016, 10:35 AM   #31
Senior Member
 
dagmandt's Avatar
 
Outdoors RV Owners Club
Join Date: Feb 2013
Location: Auburn, WA
Posts: 427
Quote:
Originally Posted by BrianGlenn View Post
Does your trimetric show instantaneous amperage, positive while charging? Did you record this at 65 mph? Curious.....

Brian
Yes, it does and it is measuring what the battery is seeing. I did however forget to check amps, I only checked voltage. At 13.4v and < 15 amps you don't have much in the way of charging. Maintaining a charge would be good.
__________________
TV: 2012 Ford F350 CC 6.7L 4x4
TT: 2014 Wind River 250RDSW [Dual Crown 6v, Trimetric, Iota 15.4v 55A charger]
dagmandt is offline   Reply With Quote
Old 03-14-2016, 10:42 AM   #32
Senior Member
 
dagmandt's Avatar
 
Outdoors RV Owners Club
Join Date: Feb 2013
Location: Auburn, WA
Posts: 427
Folks that are calling their batteries "fully charged" need to see 12.6 - 12.8v resting (few hours of no use) to be fully charged. Anything less than 12.6v resting is not fully charged and will reduce battery life. If you are checking voltage right after charging you are seeing residual charge voltage, that isn't what your battery is really at. You can also check charge state with a cheap hydrometer if you don't have a good means for testing voltage. Using the panel they supply in travel trailers is a very poor way to understand the true charge state of your battery. I know this works for many folks and if you don't care then keep on doing it. It isn't harming anyone. I'm just pointing out what I've learned over the last 3 years via experience and reading a lot on the subject. Good battery maintenance and charging procedures will give you many years of service. It can save you several hundred bucks every 2-3 years... that's why I invested in the trimetric and charger. It isn't for everyone though.
__________________
TV: 2012 Ford F350 CC 6.7L 4x4
TT: 2014 Wind River 250RDSW [Dual Crown 6v, Trimetric, Iota 15.4v 55A charger]
dagmandt is offline   Reply With Quote
Old 03-14-2016, 10:57 AM   #33
Senior Member
 
Join Date: Jul 2014
Posts: 9,796
Quote:
Originally Posted by dagmandt View Post
I happen to be equipped to test this out and did just that yesterday. I have a trimetric and a video camera, that is all that was needed.

Battery resting voltage: 12.5v which has a little use on it.
Trailer hooked up at idle: 12.9v
Hauling the trailer at 65mph: 13.4v

So, there ya have it, as I predicted you will get a trickle charge while driving which is great for keeping an already charged battery topped off. If you rely on this solely you will greatly reduce your battery life. Charging fully before leaving or after arriving with a charger/generator would be the right thing to do for good battery life.
Darren
Redo the rest with a battery voltage of 12.1 to 12.3 then report readings.

12.5 is 90% state of charge. The alternator is not going to see that small a defecit.
__________________
twinboat is offline   Reply With Quote
Old 03-14-2016, 10:59 AM   #34
Senior Member
 
BrianGlenn's Avatar


 
Country Coach Owners Club
Join Date: Apr 2015
Location: Alberta
Posts: 897
Quote:
Originally Posted by dagmandt View Post
Yes, it does and it is measuring what the battery is seeing. I did however forget to check amps, I only checked voltage. At 13.4v and < 15 amps you don't have much in the way of charging. Maintaining a charge would be good.
Agreed, but curious to know your measured results for current. I could not get more than 15-20 Ah into my batteries over 3 hours with 7-pin charge wire (5-7 A DC instantaneous). See my previous post #26. I did not have a video camera at the time to view instantaneous current in the trailer while I was travelling down the highway.

My conclusion at the time was the small gauge OEM charge wire (14 AWG?) limited voltage at trailer batteries. The tow vehicle alternator is voltage controlled (14.4v?) and voltage loss limited max voltage seen at the trailer batteries. I know others who have run dedicated 10 or 8 gauge wire from alternator output to new charge connector at back of truck, especially those who run a 12V lift/dump trailer.

Thanks for posting the voltage results.

Brian
__________________
Towr: 2007 Country Coach Allure 470 - 37 Sunset Bay Cummins 400 ISL
Toad: 2016 F150 King Ranch - 3.5L EcoBoost 4x4 Supercrew (curb weight 4,775 lbs)
Toad: SOLD 2007 Jeep Grand Cherokee (yes, it has a Hemi) (curb weight 4,720 lbs)
BrianGlenn is offline   Reply With Quote
Old 03-14-2016, 11:13 AM   #35
Senior Member
 
dagmandt's Avatar
 
Outdoors RV Owners Club
Join Date: Feb 2013
Location: Auburn, WA
Posts: 427
Quote:
Originally Posted by twinboat View Post
Redo the rest with a battery voltage of 12.1 to 12.3 then report readings.

12.5 is 90% state of charge. The alternator is not going to see that small a defecit.
Actually, at that state the alternator would be pushing the most voltage. As the battery charges, the voltage supplied goes up. For instance: When I'm charging with my Iota, it starts out under 14v, then when near complete I see ~15v. I can certainly try to remember to record it for real world testing but I doubt there will be anything much higher than the 13.4v. Even if it did approach 14v, with a max of maybe 15 amps you aren't going to charge very fast and still haven't reached bulk charge voltage.
__________________
TV: 2012 Ford F350 CC 6.7L 4x4
TT: 2014 Wind River 250RDSW [Dual Crown 6v, Trimetric, Iota 15.4v 55A charger]
dagmandt is offline   Reply With Quote
Old 03-14-2016, 11:14 AM   #36
Senior Member
 
dagmandt's Avatar
 
Outdoors RV Owners Club
Join Date: Feb 2013
Location: Auburn, WA
Posts: 427
Quote:
Originally Posted by BrianGlenn View Post
Agreed, but curious to know your measured results for current. I could not get more than 15-20 Ah into my batteries over 3 hours with 7-pin charge wire (5-7 A DC instantaneous). See my previous post #26. I did not have a video camera at the time to view instantaneous current in the trailer while I was travelling down the highway.

My conclusion at the time was the small gauge OEM charge wire (14 AWG?) limited voltage at trailer batteries. The tow vehicle alternator is voltage controlled (14.4v?) and voltage loss limited max voltage seen at the trailer batteries. I know others who have run dedicated 10 or 8 gauge wire from alternator output to new charge connector at back of truck, especially those who run a 12V lift/dump trailer.

Thanks for posting the voltage results.

Brian
I'll do my best to test it out for you when I get to the trailer next.
__________________
TV: 2012 Ford F350 CC 6.7L 4x4
TT: 2014 Wind River 250RDSW [Dual Crown 6v, Trimetric, Iota 15.4v 55A charger]
dagmandt is offline   Reply With Quote
Old 03-14-2016, 11:30 AM   #37
Senior Member
 
Outdoors RV Owners Club
Join Date: Dec 2014
Location: Nowhere, now here. Freedom!
Posts: 2,998
Thanks for your testing and reporting dagmandt. This is interesting.
__________________
ORV 19B Full Timer, '14 Ram 2500 Diesel and a GSD. This signature updated, May 1, '17.
Currently funemployed in Vancouver WA de K7NOL 146.52Mhz Safety? (CLICK ME!)
1bigmess is offline   Reply With Quote
Old 03-14-2016, 11:33 AM   #38
Senior Member
 
dagmandt's Avatar
 
Outdoors RV Owners Club
Join Date: Feb 2013
Location: Auburn, WA
Posts: 427
Quote:
Originally Posted by 1bigmess View Post
Thanks for your testing and reporting dagmandt. This is interesting.
No problem. I like to see the math work out in real world testing so it is kind of fun/educational.
__________________

__________________
TV: 2012 Ford F350 CC 6.7L 4x4
TT: 2014 Wind River 250RDSW [Dual Crown 6v, Trimetric, Iota 15.4v 55A charger]
dagmandt is offline   Reply With Quote
Reply

Tags
batteries, charging



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
Batteries, Batteries, Batteries... JasonDean Newmar Owner's Forum 46 07-09-2016 08:58 AM
Auxiliary Batteries vs. Main Batteries - which is which? Batteries dying.......😞 Napabeth Fleetwood Products Owner's Forum 16 08-05-2015 01:54 PM
"Charging Station" USB chargers not charging scottandanna Forest River Owners Forum 28 06-24-2015 08:11 PM
charging system not charging carguru1 Vintage RV's 1 08-16-2011 10:10 AM
Charging System Not Charging scaragon Travel Trailer Discussion 22 08-06-2009 11:41 AM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:36 AM.


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