Jayco RV Owners Forum
 


Reply
 
Thread Tools Display Modes
 
Old 10-04-2011, 11:46 PM   #1
Junior Member
 
Join Date: Oct 2011
Posts: 2
Charging 26BH from Tow Vehicle

I recently purchased a 2012 Jay Flight TT and expect to do some dry camping from time to time at the ocean. After weighing the plusses and minuses of purchasing and lugging and storing a generator, I decided to make a 4gauge 10' extension cable using the 7pin tow vehicle cable to connect my Ford Expedition to the trailer. The 100+ amp alternator in the Expedition should deliver a significant charge through the heavy wire (limited by a realistic fuse). This will require no mods to the TT and I can then use a 2000watt inverter to run the tv, a few short bursts of the microwave and even a pot of coffee in the morning. Running the tow vehicle will eliminate any noise problems and should top off the TT batteries in less than an hour. All of this assumes doubling up on the supplied battery or going the golf cart battery route. Has anyone tried anything like this? Ed, Albany, NY
__________________

foodwatch2003 is offline   Reply With Quote
Old 10-05-2011, 11:34 AM   #2
Senior Member
 
Terry's Avatar
 
Join Date: Feb 2011
Location: Germantown, TN
Posts: 4,923
I think you may be a little overly optimistic on the charging capability of the 7 pin. I have not seen my battery take more than 7 or 8 amps charging from the vehicle. I am sure the larger gauge wire will help some, but I think the limitation is the internal vehicle wiring.

I think for that level of charging, you would be better off with some type of direct battery connection such as this:


Having said that - I am not sure how the deep cycle batteries would handle that kind of charging all the time directly from the alternator - Occasionally it would be fine, but I would think repeated rapid charging like that would lessen the life.

Now this is just me - I would make sure I had a good pair of 6 volts all charged up for the camping trip and rely on the 7 pin for occasional top-offs and for use in the event you run out and need power in a pinch. I dont think I would rely on it as a power strategy.
__________________

__________________
Terry
2009 Jayco 26BH
2004 Chevy Silverado 1500
2009 JayFlight Manual Library

Want to add a signature to your posts? --> Click Here
Terry is offline   Reply With Quote
Old 10-05-2011, 12:47 PM   #3
Senior Member
 
3'senough's Avatar
 
Join Date: Sep 2010
Location: New York
Posts: 2,072
Spend the extra $ on upgrading to 6V true deep cycles and using the existing 7 pin as stated. Do a search in this forum on batteries and you'll see several reccomendations from other members.

I have 2-6V in my rig and they will last several days under normal use. Your TV usually can keep up with them enough. If your going to do a week you will need a genny. But if only for charging and light use then you can get away with a small cheaper one as a hour twice a day will suffice in keeping them up full though your converter.
__________________

2014 375 BHFS Eagle Premier
2014 Ram 3500 Longhorn DRW CC
6.7 CTD, Aisin, 4.10's
Yamaha EF3000iSEB
3'senough is offline   Reply With Quote
Old 10-05-2011, 04:36 PM   #4
Moderator Emeritus
 
Rustic Eagle's Avatar
 
Join Date: Apr 2011
Location: Michigan
Posts: 7,370
Ed,

Welcome to the Jayco forums.

I have to concur with the thoughts that "Terry" and "3'senough" offered.

Quote:
Originally Posted by foodwatch2003 View Post
snip.....All of this assumes doubling up on the supplied battery or going the golf cart battery route.....snip
Since you apparently will be doing some degree of boondocking, two 6V 100%True Deep Cycle batteries would be a good investment for a number of reasons. The biggest advantage is the additional AMP capacity, but equally important is that a 100% true deep cycle battery will take a whole lot more discharge/charge cycles over a standard 12V RV/Marine battery, this means longer life.

For example......,

A shallower average DoD (Depth-of-Discharge) will increase battery life. A deep cycle battery with an average 50% DoD will last at least twice as long as an 80% DoD. A typical GC-2 deep cycle battery will average 225 cycles at 80% DoD, but will increase to 750 cycles at 50% DoD.


**Cycles**



****************** % Depth of Discharge *************

Just some additional food for thought. Also, check out the "Jayco Mods" section of this forum for both 12V and 6V battery upgrades.

Bob
__________________

2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (integrated sway control)
Rustic Eagle is offline   Reply With Quote
Old 10-05-2011, 06:25 PM   #5
Senior Member
 
Terry's Avatar
 
Join Date: Feb 2011
Location: Germantown, TN
Posts: 4,923
Just a few more thoughts on your original post - where are you camping and for how long at a time? I know you said by the ocean, but do you anticipate running the furnace much? That is going to be a huge draw and will really shorten the run time. On the coffee, I would do the old fashioned perc. Trying to run that from an inverter would also suck a lot of power. The micro - would be iffy - again would suck a lot of power. If I was going to run it, I would do so on generator. Television is good, but be careful. I have a flat screen that uses like 75 watts. They have them now that are half that.
__________________
Terry
2009 Jayco 26BH
2004 Chevy Silverado 1500
2009 JayFlight Manual Library

Want to add a signature to your posts? --> Click Here
Terry is offline   Reply With Quote
Old 10-05-2011, 06:38 PM   #6
Junior Member
 
Join Date: Sep 2011
Posts: 6
I went with the large wire approach shown in the picture above (but no jumper cable ends). I ut in a circuit breaker, 4AWG from the burbs engine compartment to the rear, with the quick disconnects wired to the batteries. We often drive for hours between destination and it seems to help. I also run the fridge off the inverter while doing so and this keeps em from depleting.
shenandoah75 is offline   Reply With Quote
Old 10-06-2011, 09:10 AM   #7
Senior Member
 
Terry's Avatar
 
Join Date: Feb 2011
Location: Germantown, TN
Posts: 4,923
So things brings up another question I alluded to in my original reply -

Does charging a deep cycle with an alternator for long periods of time have any impact on the battery? I am used to the 3 and 4 stage chargers, but what is the charge pattern for an alternator? I realize this is probably no big issue for occasional charging, but how would the battery react to long and repeated charging with an alternator? Come to think of it, boats do it all the time - so I guess it is ok?
__________________
Terry
2009 Jayco 26BH
2004 Chevy Silverado 1500
2009 JayFlight Manual Library

Want to add a signature to your posts? --> Click Here
Terry is offline   Reply With Quote
Old 10-06-2011, 10:18 AM   #8
Moderator Emeritus
 
Rustic Eagle's Avatar
 
Join Date: Apr 2011
Location: Michigan
Posts: 7,370
Quote:
Originally Posted by tafische View Post
snip......Does charging a deep cycle with an alternator for long periods of time have any impact on the battery? I am used to the 3 and 4 stage chargers, but what is the charge pattern for an alternator?.......snip
Terry,

Even though a high output alternator can deliver high voltage capacities, the voltage regulator controls the amount of output to the TV battery based on the TV battery's charging requirements. The alternator is also supplying the TV's electrical system needs separate from the TV's battery charging requirements, thus the TV battery is a "backup" for those times when the alternator can't meet the electrical systems demands. The main purpose of a battery in a TV is to start the engine.

Now, I can only assume that the dedicated 12V battery connection (#4 pin) on the 7 pin connector is somehow tied into the TV's battery charging system. If this is true, this might explain the low amp output at the #4 pin connection, and may also provide some protection from over charging the TT battery (?).

So, could one assume that the voltage regulator is controlling the "charge pattern" (amp output) from the alternator to the TV and TT batteries?

Well, it sounds good anyways

Bob
__________________

2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (integrated sway control)
Rustic Eagle is offline   Reply With Quote
Old 10-06-2011, 12:45 PM   #9
Senior Member
 
3'senough's Avatar
 
Join Date: Sep 2010
Location: New York
Posts: 2,072
Eagle is correct #4 pin on the TV, black wire lead is the charging lead from your TV 12V system. As far as regulation goes the alternators are just like generators in that the faster they turn to more they generate, when activated by the regulator. With that being said your charge times will be longer as it idles but due to the draw from your TT the alternator should be putting out as much as it needs to meet demand. It won't spike like your convertor to 14.4V in stage one but you should be putting out 13.8V or so from your TV to bump them up. During Irene I had to use my TV for two days and according to my inverter read out I was as low as 12.2 and within an hour back to 12.7-12.8. I just let my truck idle since my genny was home due to being at a full hook up facility.

If your going to do weeks dry camping though your going to want to invest in the battery upgrade and if you don't need the other amenities like A/C, coffee pots, or micros get a small 1K genny so you will be able to keep up with your usage. As mentioned above, if your going to use your heater your batteries are going to take a hit overnight. Which ocean location?
__________________

2014 375 BHFS Eagle Premier
2014 Ram 3500 Longhorn DRW CC
6.7 CTD, Aisin, 4.10's
Yamaha EF3000iSEB
3'senough is offline   Reply With Quote
Old 10-06-2011, 05:24 PM   #10
Senior Member
 
Terry's Avatar
 
Join Date: Feb 2011
Location: Germantown, TN
Posts: 4,923
Quote:
thus the TV battery is a "backup" for those times when the alternator can't meet the electrical systems demands
I will agree with you mostly! I had a Dodge van that required a battery. Without it, the computer would not run and thus the car would not run. I hated that car! I had the battery drop a cell - would jump it - and as soon as I pulled the cables - it would die. Was told that was how they were....
__________________

__________________
Terry
2009 Jayco 26BH
2004 Chevy Silverado 1500
2009 JayFlight Manual Library

Want to add a signature to your posts? --> Click Here
Terry is offline   Reply With Quote
Reply

Thread Tools
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


» Virginia State Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -6. The time now is 04:52 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2002-2016 Social Knowledge, LLC All Rights Reserved.