RV News RVBusiness 2021 Top 10 RVs of the Year, plus 56 additional debuts and must-see units → ×
 

Go Back   Keystone RV Forums > Keystone Fleet | Keystone RV Models > Travel Trailers
Click Here to Login

Reply
 
Thread Tools Display Modes
 
Old 07-07-2019, 08:36 AM   #21
Canonman
Senior Member
 
Canonman's Avatar
 
Join Date: May 2016
Location: South Jordan, Utah
Posts: 1,475
The converter will see the new set up as a single 12v battery and charge normally. It will charge slower since the batteries are larger but that's about the only change.
__________________

__________________
2017 Cougar 279RKSWE
2007.5 Dodge Ram 2500 6.7 Cummins
Retirement Training Completed
What happens when you get "Scared half to Death" a second time
Canonman is offline   Reply With Quote
Old 07-07-2019, 08:39 AM   #22
Bamabox
Member
 
Bamabox's Avatar
 
Join Date: May 2017
Location: CT frontier
Posts: 83
So no worries about overcharging when constantly hooked to 110 shore power?
__________________

__________________
2017 Cougar XLite 21 RBS

2015 Ram 3500 SLT 5.7 Hemi
Bamabox is offline   Reply With Quote
Old 07-07-2019, 08:41 AM   #23
Logan X
Senior Member
 
Logan X's Avatar
 
Join Date: Oct 2018
Location: Southern California
Posts: 1,275
Quote:
Originally Posted by Bamabox View Post
OK, got my Costco Interstate GC2ís couple days ago, got individual GC2 boxes, everything fit fine on the tongue rack. They are in, and wired. Each battery checked at 6.36V prior to installing. After install and jumpered in series, voltage checked at 12.72V. Love it when math works. After reconnecting the battery breaker, and connecting my 110/15A ďshore powerĒ from the barn, batteries were reading 13.41. Hereís the question. While Iím connected to my shore power, is the built in converter/inverter in my 2017 Cougar XLite 21RBS going to maintain a ďproperĒ charge level on these GC2ís? And not OVERCHARGE them?
Unless Iím mistaken, the onboard charger/converter sees your 2 GC2 batteries the same as 1 12v battery. Your battery set up is still flooded lead acid with 12v output. The charging profile is the same.
__________________
Mike
2017 F250 6.7 Powerstroke FX4 crew cab
2016 Hideout 24BHSWE (27 foot TT)

Check me out on YouTube if you love America:
https://www.youtube.com/channel/UCmF...gJpypWJz5Lgl3w
Logan X is offline   Reply With Quote
Old 07-07-2019, 08:45 AM   #24
JRTJH
Site Team
 
JRTJH's Avatar
 
Join Date: Mar 2011
Location: Gaylord
Posts: 20,297
Quote:
Originally Posted by Bamabox View Post
OK, got my Costco Interstate GC2’s couple days ago, got individual GC2 boxes, everything fit fine on the tongue rack. They are in, and wired. Each battery checked at 6.36V prior to installing. After install and jumpered in series, voltage checked at 12.72V. Love it when math works. After reconnecting the battery breaker, and connecting my 110/15A “shore power” from the barn, batteries were reading 13.41. Here’s the question. While I’m connected to my shore power, is the built in converter/inverter in my 2017 Cougar XLite 21RBS going to maintain a “proper” charge level on these GC2’s? And not OVERCHARGE them?
First, the "built in converter/inverter" is a "converter/charger" and there's no "inverter" that's built in as OEM equipment. CONVERTERS change 120VAC to 12VDC and are used to charge batteries. INVERTERS change 12VDC to 120VAC and are used to discharge batteries...

That said, IF (NOTE THE CAPS and underlined word) your OEM WFCO converter/charger is operating properly and the reverse polarity fuses are intact, then it should reliably charge and maintain your GC2 batteries without any problems. You WILL need to check battery electrolyte level regularly. When I first installed my GC2 system, I checked the batteries weekly until I was sure they weren't leaking or losing electrolyte. After a couple of months, I felt comfortable with them and now (for the past 6 years) I check them monthly when the trailer is in use and store them in the garage during the winter. While in storage, I do not "maintain them on a charger" but rather I connect them monthly to an automatic 12 amp battery charger and leave them connected overnight (usually about 12 hours). Otherwise, my GC2 system has required no maintenance or special handling.

You might want to buy a battery handling strap to lift the batteries in and out of the battery boxes. They are an excellent addition to any golf cart battery system. The first time you "crush a finger" lifting a battery by the sides of the case, you'll appreciate the handling strap. https://www.amazon.com/3G-Golf-Batte...s%2C174&sr=8-3
__________________
John



2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
JRTJH is offline   Reply With Quote
Old 07-07-2019, 08:49 AM   #25
Gizmo2
Junior Member
 
Join Date: Jul 2018
Location: Satellite Beach
Posts: 5
I have owned multiple RVs and boats with both dual 12v and 6 volt battery configurations. Two 12v batteries in parallel can suffer from loss of capacity as the stronger battery will discharge thru the weaker until they are the same voltage. This isn't much of an issue when they are new but can be as the batteries age. With dual 6 volts in series one weak cell will have a fraction of the effect on the total bank voltage as 12s in parallel.

I also completely agree with what's been posted about the cycle life of 12v vs 6v. To get good cycle life from a 12v you should really consider AGM batteries. They are twice the price or more however.

One issue with golf cart batteries is that they consume water over time and you have to top them up periodically with pure water. I think 6v is worse than 12 because of the way they are vented. I've noticed the 12 v batteries on my boat were low on water after a year of use so the maintenance free claim is just a marketing slogan.

I worked on a project involving a battery powered refrigerated shipping container a couple of years ago. The original system used 4 six volt AGM batteries in series that could keep the system cold for 5 days. I modified it to use LiFePo lithium batteries. It's was amazing what a difference they made. The system had double the capacity at half the weight. I know there are golf carts using this technology along with a few RVs. It will be a game changer if the price ever becomes competitive.
Gizmo2 is offline   Reply With Quote
Old 07-07-2019, 08:49 AM   #26
Ccsluke
Junior Member
 
Join Date: Jun 2018
Location: Purvis
Posts: 13
Just do the math!
Two 6v 100ah batteries seriesíd Together gives you 12v at 100ah. So expect to pay much more for one 12v 100ah battery. Youíll get the same output from the one 12v as two 6vís. In my research (donít take my word, do your own), One 12v battery is cheaper than two 6v when you compare total ah output. As an electrical engineer Iíve dealt with all types of batteries in various applications for the past 40 years. IMO I would never put a 6v battery on my RV!
Ccsluke is offline   Reply With Quote
Old 07-07-2019, 08:50 AM   #27
Canonman
Senior Member
 
Canonman's Avatar
 
Join Date: May 2016
Location: South Jordan, Utah
Posts: 1,475
Depending on the model converter in your Cougar, you should have 3 charge stages. Our Cougar is equipped with the WFCO 8955 converter.
Bulk, 14.4 vdc; Absorption, 13.6vdc and Float, 13.2vdc. The float function is meant to maintain your batteries while the other two are for bringing the batteries up to full charge.
The 8955 is capable of monitoring the battery load and automatically adjusts from absorption to float mode. If there is any load detected while in float mode the converter will switch back to absorption mode.
__________________
2017 Cougar 279RKSWE
2007.5 Dodge Ram 2500 6.7 Cummins
Retirement Training Completed
What happens when you get "Scared half to Death" a second time
Canonman is offline   Reply With Quote
Old 07-07-2019, 08:53 AM   #28
Logan X
Senior Member
 
Logan X's Avatar
 
Join Date: Oct 2018
Location: Southern California
Posts: 1,275
Quote:
Originally Posted by Ccsluke View Post
Just do the math!
Two 6v 100ah batteries series’d Together gives you 12v at 100ah. So expect to pay much more for one 12v 100ah battery. You’ll get the same output from the one 12v as two 6v’s. In my research (don’t take my word, do your own), One 12v battery is cheaper than two 6v when you compare total ah output. As an electrical engineer I’ve dealt with all types of batteries in various applications for the past 40 years. IMO I would never put a 6v battery on my RV!
...except one of my 6v batteries is 240 amp hours. I haven’t seen a single 12v battery that can match that.
__________________
Mike
2017 F250 6.7 Powerstroke FX4 crew cab
2016 Hideout 24BHSWE (27 foot TT)

Check me out on YouTube if you love America:
https://www.youtube.com/channel/UCmF...gJpypWJz5Lgl3w
Logan X is offline   Reply With Quote
Old 07-07-2019, 09:07 AM   #29
Ccsluke
Junior Member
 
Join Date: Jun 2018
Location: Purvis
Posts: 13
Again, if you compare ah to ah, I can also get two 12v 150 ah batteries for about the same price as two 6v 240 ah batteries. You have to series the 6v’s to get 12v at 240ah. If you parallel the two 12v’s you’ll get 12v at 300ah...and if one of my batteries goes bad, I can just disconnect it and still have 150ah capacity. This is not an opinion, it’s fact. Again, I see absolutely no use for 6v batteries on an RV!
Ccsluke is offline   Reply With Quote
Old 07-07-2019, 09:11 AM   #30
MarkEHansen
Senior Member
 
MarkEHansen's Avatar
 
Join Date: Oct 2018
Location: Sacramento
Posts: 813
Quote:
Originally Posted by Ccsluke View Post
Just do the math!
Two 6v 100ah batteries seriesíd Together gives you 12v at 100ah. So expect to pay much more for one 12v 100ah battery. Youíll get the same output from the one 12v as two 6vís. In my research (donít take my word, do your own), One 12v battery is cheaper than two 6v when you compare total ah output. As an electrical engineer Iíve dealt with all types of batteries in various applications for the past 40 years. IMO I would never put a 6v battery on my RV!
Okay, here's my math. Regarding FLA batteries only, the best Bang-for-the-buck 12V battery I could find was the Trojan SC S225. This can be had for a little over $200 and has a 20-hour capacity of 130AH.

A reasonable 6V battery is the Interstate GC2 which can be had from Costco for around $100. This has a 20-hour rate of 210AH.

Dual 12v batteries means 260AH for around $400.

Dual 6v batteries means 210AH for around $200

In my opinion, the clear winner is the 6v set. Not only better AH per dollar, but you get other benefits from 6V batteries, such as heavier plates, better discharge levels, longer life, etc.

If you're looking for more AH capacity, you can go with the Duracell SLI6V225S 6v battery. It has a 20-hour rating of 250AH but cost around $200. Using two of these, you would get 250AH for around $400. Not quite as good as the Trojan, but you still get all the other 6v benefits.

I still think 6v batteries win, easily.
__________________
2019 Cougar Half Ton 26RBSWE - "Bertha"
2019 GMC Sierra 3500 Denali HD 6.6L Duramax TD, CC, 4WD, DRW - "Mr. Beefy"
MarkEHansen is offline   Reply With Quote
Old 07-07-2019, 09:11 AM   #31
Logan X
Senior Member
 
Logan X's Avatar
 
Join Date: Oct 2018
Location: Southern California
Posts: 1,275
Quote:
Originally Posted by Ccsluke View Post
Again, if you compare ah to ah, I can also get two 12v 150 ah batteries for about the same price as two 6v 240 ah batteries. You have to series the 6vís to get 12v at 240ah. If you parallel the two 12vís youíll get 12v at 300ah...and if one of my batteries goes bad, I can just disconnect it and still have 150ah capacity. This is not an opinion, itís fact. Again, I see absolutely no use for 6v batteries on an RV!
Could you share a link to the 12v 150 amp hour battery please?
__________________
Mike
2017 F250 6.7 Powerstroke FX4 crew cab
2016 Hideout 24BHSWE (27 foot TT)

Check me out on YouTube if you love America:
https://www.youtube.com/channel/UCmF...gJpypWJz5Lgl3w
Logan X is offline   Reply With Quote
Old 07-07-2019, 10:28 AM   #32
Bamabox
Member
 
Bamabox's Avatar
 
Join Date: May 2017
Location: CT frontier
Posts: 83
Quote:
Originally Posted by Logan X View Post
Could you share a link to the 12v 150 amp hour battery please?
I might be a bad searcher on the internet, but when I was deciding on the battery upgrade issue, I did a LOT of searching and I donít recall a 12V true deep cycle (no cold cranking spec) with 150 AH @20 hours.
__________________
2017 Cougar XLite 21 RBS

2015 Ram 3500 SLT 5.7 Hemi
Bamabox is offline   Reply With Quote
Old 07-07-2019, 11:07 AM   #33
Bamabox
Member
 
Bamabox's Avatar
 
Join Date: May 2017
Location: CT frontier
Posts: 83


Well, the 6Vís are in. Happy except for the batter straps. Tough to get really tight. Maybe theyíre tight enough, but if I have to keep an eye on water level in the batteries Iíd like to come up with something better and easier. They fit OK on the tongue rack, but not much room to spare from side to side with the individual boxes. If I had used a single box to hold both, would have needed to reroute the propane line. This was it just went in between the two boxes. Thanks to all for the advise and help.
__________________
2017 Cougar XLite 21 RBS

2015 Ram 3500 SLT 5.7 Hemi
Bamabox is offline   Reply With Quote
Old 07-07-2019, 11:31 AM   #34
Canonman
Senior Member
 
Canonman's Avatar
 
Join Date: May 2016
Location: South Jordan, Utah
Posts: 1,475
A FINE JOB...Finally Done!!
__________________
2017 Cougar 279RKSWE
2007.5 Dodge Ram 2500 6.7 Cummins
Retirement Training Completed
What happens when you get "Scared half to Death" a second time
Canonman is offline   Reply With Quote
Old 07-07-2019, 11:35 AM   #35
Ccsluke
Junior Member
 
Join Date: Jun 2018
Location: Purvis
Posts: 13
Can’t vouch for your internet search skills one way or another. I provided facts backed up by science. you provided an opinion which you are certainly entitled to! I guess it’s just what you feel the most comfortable with. That’s why I only try to post science based facts and let the readers make up their own minds and form their own opinions.
Ccsluke is offline   Reply With Quote
Old 07-07-2019, 11:49 AM   #36
JRTJH
Site Team
 
JRTJH's Avatar
 
Join Date: Mar 2011
Location: Gaylord
Posts: 20,297
Gil,

Have you considered changing out those battery box straps for cheap 1.5" ratchet cargo straps? You can get them at WalMart for around $5 each. Just thread them up, ratchet them tight and tuck the loose end under the strap. When you need access, loosen the ratchet slightly, slide off the side of the box and open the lid. Easy to keep track of since they don't ever leave the battery tray and "finger tight on the ratchet handle" is all the strength needed to keep them tight.
__________________
John



2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
JRTJH is offline   Reply With Quote
Old 07-07-2019, 11:53 AM   #37
Bamabox
Member
 
Bamabox's Avatar
 
Join Date: May 2017
Location: CT frontier
Posts: 83
Yes, there are lots of opinions about 6v vs 12v on a trailer. And your facts might be based on hard science. Just provide us with the brand and a link to the 12V 150AH @ 20 hour battery. That would be a fact as well.
__________________
2017 Cougar XLite 21 RBS

2015 Ram 3500 SLT 5.7 Hemi
Bamabox is offline   Reply With Quote
Old 07-07-2019, 11:54 AM   #38
Bamabox
Member
 
Bamabox's Avatar
 
Join Date: May 2017
Location: CT frontier
Posts: 83
Quote:
Originally Posted by JRTJH View Post
Gil,

Have you considered changing out those battery box straps for cheap 1.5" ratchet cargo straps? You can get them at WalMart for around $5 each. Just thread them up, ratchet them tight and tuck the loose end under the strap. When you need access, loosen the ratchet slightly, slide off the side of the box and open the lid. Easy to keep track of since they don't ever leave the battery tray and "finger tight on the ratchet handle" is all the strength needed to keep them tight.
Done. Thanks.
__________________
2017 Cougar XLite 21 RBS

2015 Ram 3500 SLT 5.7 Hemi
Bamabox is offline   Reply With Quote
Old 07-07-2019, 11:55 AM   #39
Logan X
Senior Member
 
Logan X's Avatar
 
Join Date: Oct 2018
Location: Southern California
Posts: 1,275
Quote:
Originally Posted by Ccsluke View Post
Canít vouch for your internet search skills one way or another. I provided facts backed up by science. you provided an opinion which you are certainly entitled to! I guess itís just what you feel the most comfortable with. Thatís why I only try to post science based facts and let the readers make up their own minds and form their own opinions.
You said that you could get a 150amp hour 12v battery for the same price as a 240 amp hour 6v battery. Can you provide a link to a specific battery or name the specific battery? I would be interested in that when I need new batteries.
__________________
Mike
2017 F250 6.7 Powerstroke FX4 crew cab
2016 Hideout 24BHSWE (27 foot TT)

Check me out on YouTube if you love America:
https://www.youtube.com/channel/UCmF...gJpypWJz5Lgl3w
Logan X is offline   Reply With Quote
Old 07-07-2019, 12:28 PM   #40
WestCoastWanderer
Member
 
WestCoastWanderer's Avatar
 
Join Date: May 2018
Location: San Joaquin Valley
Posts: 40
Nice!

Looks good!

I don't think I could get those 6V batteries into the tray on my 2018 21RBSWE.

I have installed a second battery into the rack. Interstates, because I love the warrantee. Of note, I had to trim the back off of the plastic battery box covers in order for them to fit. It's too tight against the front of the trailer. I get two nights of dry camping without drawing down the batteries too much. By then, I want full hookups, and away I go.

Of note, I drilled several holes into the bottom of the battery boxes to drain any rain/road spray that accumulates (another tip from this forum).
Attached Thumbnails
Click image for larger version

Name:	IMG_0668.jpg
Views:	50
Size:	186.8 KB
ID:	22701   Click image for larger version

Name:	IMG_5467.jpg
Views:	49
Size:	186.9 KB
ID:	22702  
__________________

WestCoastWanderer is offline   Reply With Quote
Reply

Tags
upgrade

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
Forum Jump

Powered by vBadvanced CMPS v3.2.3
Disclaimer:

This website is not affiliated with or endorsed by the Keystone RV Company or any of its affiliates in any way. Keystone RVģ is a registered trademark of the Keystone RV Company.


All times are GMT -8. The time now is 06:19 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
×