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


Reply
 
Thread Tools Display Modes
Old 05-07-2013, 01:41 PM   #1
Member
 
Join Date: Sep 2011
Location: Santa Rosa, CA
Posts: 43
2 battery w/switch wiring schematic

Hey everyone, Does anyone have an updated wiring schematic for parallel wiring of 2 batteries, I did a search and in those old posts the diagrams werent showing up so can anyone help me out? I want to use one of those red battery switches also because in my setup I need the extra battery when I cant run a genny at night and want to run my suburban furnace. With one battery it shuts down after a couple of minutes. but its fine with shore power. thanks again
__________________
2008 Rockwood 2701SS
2001 4.7 Tundra TRD
1995 K2500 Suburban 4X4 w/Towmaster chip
sprayking is offline   Reply With Quote
Old 05-07-2013, 02:22 PM   #2
Phat Phrog Stunt Team
 
TURBS's Avatar
 
Join Date: Aug 2011
Location: Iowa
Posts: 34,499
Quote:
Originally Posted by sprayking View Post
Hey everyone, Does anyone have an updated wiring schematic for parallel wiring of 2 batteries, I did a search and in those old posts the diagrams werent showing up so can anyone help me out? I want to use one of those red battery switches also because in my setup I need the extra battery when I cant run a genny at night and want to run my suburban furnace. With one battery it shuts down after a couple of minutes. but its fine with shore power. thanks again
If you are adding another battery you would be very wise to install a matched new set vs adding a new one with your old battery.

Turbs
TURBS is offline   Reply With Quote
Old 05-07-2013, 02:52 PM   #3
Member
 
Join Date: Sep 2011
Location: Santa Rosa, CA
Posts: 43
Oh yeah, I plan on going in to Interstate and get a pair of group 27's.
I want to fab a battery dual battery box and vent it under the front storage I am just not sure if I want to punch a hole through exterior of the TT for the vent, I could of course mount it where the single batt box is now right in front of the propane tanks but I sure would want that weight pushed back in the trailer tho.
__________________
2008 Rockwood 2701SS
2001 4.7 Tundra TRD
1995 K2500 Suburban 4X4 w/Towmaster chip
sprayking is offline   Reply With Quote
Old 05-07-2013, 11:13 PM   #4
Senior Member
 
Himcules's Avatar
 
Join Date: Feb 2011
Posts: 319
you could go with sealed batteries as well. you would not need to vent the enclosure. just another option for you to think about.

to wire 2 12v batteries in parallel, you just hook up positive to positive, then negative to negatiive. make sure the cables are the same length and thick enough gauge.

then to connect the battery bank to your trailer, connect to a negative terminal of 1 battery and the positive terminal of the other battery (the connections should not be on only 1 battery, but across the bank).

i'm assuming the red switch you are taking about is a battery cut off? if so, put that inline with the positive feed from the battery bank to the trailer.
__________________
============================
himcules (10x stronger than hercules)
2013 Forest River Berkshire 390BH-60
ex 2007 Jayco Greyhawk 31SS
Himcules is offline   Reply With Quote
Old 05-07-2013, 11:31 PM   #5
Senior Member
 
Iggy's Avatar
 
Join Date: Jul 2010
Posts: 7,882
sprayking

Not sure if yo are say you want to install two 12 volt batteries or two 6 volt battereis.
Here is the two ways to get 12 volt outputs.
Attached Images
  
__________________
By All
No longer a member here.
Dec 12, 2020
Iggy is offline   Reply With Quote
Old 05-08-2013, 01:02 AM   #6
Member
 
Join Date: Sep 2011
Location: Santa Rosa, CA
Posts: 43
Yes I want to use two full size 12 volt batteries and mount them in my front storage compartment, (which is under the bed). So I wanted to make a box and vent it but as Himcules said I might want to use sealed batteries. I have looked around on the net but there was a few different ways to do it so I thought I would double check it here and see if anyone had done any of these mods. Yes I asked about the red battery switch that lets you switch the batteries and combine them also. If I wire them in parallel I do not need the switch?? hmm. I guess I better be a good forum member and do some searching on recent posts with these types of mods.
__________________
2008 Rockwood 2701SS
2001 4.7 Tundra TRD
1995 K2500 Suburban 4X4 w/Towmaster chip
sprayking is offline   Reply With Quote
Old 05-09-2013, 11:02 AM   #7
Junior Member
 
Join Date: May 2013
Posts: 4
To piggy back off this thread, I had a couple questions. My wifes Uncle just gave us his newer (less than a year old) 12V battery since he switched to 6V. I was planning on parallel wiring both 12V batteries but it turns out his is a group 31 and mine is a group 27 so I won't be doing that anymore. I was going to look into some sort of switch to flip back and forth between each battery, but since this is our first trailer (first trip next week) I don't plan on doing it right away.

My plan is to not mount the battery box, I will just leave the battery in the box in the pass thru storage. When my group 27 gets low I will take the group 31 out and disconnect the group 27 and hook up the group 31. My plan was to just leave the group 31 on the ground when hooked up.

I know it seems like a pain, but it's something I am willing to do for now since it's a free group 31 battery and we already purchased a new group 27. I guess my only question is will there be any issue leaving the battery on the ground while it's hooked up?
Rookie_Mistake is offline   Reply With Quote
Old 05-09-2013, 12:05 PM   #8
Member
 
Join Date: Sep 2011
Location: Santa Rosa, CA
Posts: 43
Thats exactly what I've been doing too, but no switch just disconnecting wires and reconnecting wires. So now I want to put a battery box in my pass through storage with one of those red battery switches with them both wired in. So they both get charged when genny is on during the day. anyways remember if you wire them together they should be a matching set of batteries, also having it resting on the ground has never been a problem for me but there is a lot of battery myths out there. FYI , I originally wanted to add the second battery to run the furnace at night when I could not run my genny but it seems that would drain the heck out of both batteries so I changed my plan and purchased a vent free propane heater so now I am in no rush for the second battery. I am fine with one battery for the lights, pump, etc.
__________________
2008 Rockwood 2701SS
2001 4.7 Tundra TRD
1995 K2500 Suburban 4X4 w/Towmaster chip
sprayking is offline   Reply With Quote
Old 05-09-2013, 12:10 PM   #9
Site Team - Lou
 
Herk7769's Avatar
 
Join Date: Oct 2009
Location: South Eastern PA
Posts: 22,872
Quote:
Originally Posted by sprayking View Post
If I wire them in parallel I do not need the switch?? hmm. I guess I better be a good forum member and do some searching on recent posts with these types of mods.

Yes, but if you keep a matched set you only need an "ON/OFF" switch.

I am not a fan of sealed batteries because they are expensive and have low AH ratings for the cost. Flooded cell batteries have much higher AH ratings per dollar.

However, having ruined more than one set of clothes getting the batteries in and out of the camper, I can certainly see the advantage.
__________________
Lou, Laura, & Freya the wonder dog
2008 GMC Sierra 3000HD Crewcab SB Allison Duramax
2019 Flagstaff 8529FLS - Pullrite 3300
HAM CALLSIGN - KC3FFW
Herk7769 is offline   Reply With Quote
Old 05-09-2013, 12:17 PM   #10
Senior Member
 
Iggy's Avatar
 
Join Date: Jul 2010
Posts: 7,882
sprayking

Also remember that you double the amperage rating but you are not increasing your battery charger output rating.
So what this means it will take double the time to charge them at your existing charger rate.
__________________
By All
No longer a member here.
Dec 12, 2020
Iggy is offline   Reply With Quote
Old 05-09-2013, 12:22 PM   #11
Site Team - Lou
 
Herk7769's Avatar
 
Join Date: Oct 2009
Location: South Eastern PA
Posts: 22,872
Quote:
Originally Posted by Iggy View Post
sprayking

Also remember that you double the amperage rating but you are not increasing your battery charger output rating.
So what this means it will take double the time to charge them at your existing charger rate.
This is correct, you are pumping twice the number of electrons in there. Filling a bathtub takes less time than a swimming pool. The plates can only take so many electrons at a time without overheating when charging. As they fill you have to slow down the rate you pump the electrons in. That is why a multi stage charger is so important.
__________________
Lou, Laura, & Freya the wonder dog
2008 GMC Sierra 3000HD Crewcab SB Allison Duramax
2019 Flagstaff 8529FLS - Pullrite 3300
HAM CALLSIGN - KC3FFW
Herk7769 is offline   Reply With Quote
Old 05-09-2013, 12:23 PM   #12
Member
 
Join Date: Sep 2011
Location: Santa Rosa, CA
Posts: 43
Herk, Originally I wanted a schematic for the wiring of the dual battery switch and batteries just like your setup except for 2 12 volt batts, but yes I know I do not need the switch, Just the "disconnect" switch. Then I found that my furnace would not run for many hours with 2 batteries anyway. So I then trashed the idea and bought a vent free heater and small solar panel to trickle my single battery during the day. 1 single optima battery will run my pump, lights, and keep my fridge on for a couple of days. during the day I can run my genny but the converter does not charge very well, but it does charge some. hope my rambling makes sense
__________________
2008 Rockwood 2701SS
2001 4.7 Tundra TRD
1995 K2500 Suburban 4X4 w/Towmaster chip
sprayking is offline   Reply With Quote
Old 05-09-2013, 01:31 PM   #13
Site Team - Lou
 
Herk7769's Avatar
 
Join Date: Oct 2009
Location: South Eastern PA
Posts: 22,872
Quote:
Originally Posted by sprayking View Post
Herk, Originally I wanted a schematic for the wiring of the dual battery switch and batteries just like your setup except for 2 12 volt batts, but yes I know I do not need the switch, Just the "disconnect" switch. Then I found that my furnace would not run for many hours with 2 batteries anyway. So I then trashed the idea and bought a vent free heater and small solar panel to trickle my single battery during the day. 1 single optima battery will run my pump, lights, and keep my fridge on for a couple of days. during the day I can run my genny but the converter does not charge very well, but it does charge some. hope my rambling makes sense
I am using 2 - 12 volt batteries.
I don't know how you got the idea that I was not...
Attached Thumbnails
Click image for larger version

Name:	My wiring diagram.jpg
Views:	2876
Size:	60.9 KB
ID:	29997  
__________________
Lou, Laura, & Freya the wonder dog
2008 GMC Sierra 3000HD Crewcab SB Allison Duramax
2019 Flagstaff 8529FLS - Pullrite 3300
HAM CALLSIGN - KC3FFW
Herk7769 is offline   Reply With Quote
Old 05-09-2013, 02:29 PM   #14
Member
 
Join Date: Sep 2011
Location: Santa Rosa, CA
Posts: 43
Thx, Sorry I thought you had a 6volt setup. I was reading a lot of threads so I got mixed up
__________________
2008 Rockwood 2701SS
2001 4.7 Tundra TRD
1995 K2500 Suburban 4X4 w/Towmaster chip
sprayking 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


» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Forest River, Inc. or any of its affiliates. This is an independent, unofficial site.



All times are GMT -5. The time now is 06:46 AM.