Reply
 
Thread Tools Display Modes
Old 05-21-2018, 04:53 PM   #1
Junior Member
 
Wprather's Avatar
 
Join Date: Apr 2018
Location: Granite Bay California
Posts: 27
Roughly how long do 2 12V batteries last?

Hi, I know this is a "it depends" question, but I'm looking for any kind of rough guess here. We are first time RV'ers, new 233S, lots to learn. We are going out for first trip this weekend. 3.5 days, 3 nights. No hookups. I saw a video showing that 2 12V batteries with a constant 5A drain (3 led lights, a small fan, and a small stereo) lasted 17 hours. I guess that seems short to me! We will of course try and not use lights, won't need the heater, but will use the water pump, refrigerator, some cooking (gas), some light usage at night but we will bring lanterns, etc. I guess I just have NO IDEA what to expect as far as how fast our 2 12V batteries will drain! Was sort of hoping that they would get you through a long weekend and get the slide back in! Any feedback is appreciated. Thanks!
__________________

Wprather is offline   Reply With Quote
Old 05-21-2018, 04:58 PM   #2
Site Team
 
bikendan's Avatar
 
Join Date: Jan 2007
Location: Camano Island, Washington
Posts: 14,751
Guessing that they are dual purpose batteries(not true deep cycle batteries)and you don't use the furnace, 3-4 days if they are fully charged on arrival. That's what we would get.

But that was just the two of us and we are long time dry campers.
__________________

__________________
Dan-Retired Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 4x4 3.5 Ecoboost w/Max Tow Package
Equalizer WDH and Prodigy BC
bikendan is online now   Reply With Quote
Old 05-21-2018, 05:05 PM   #3
Senior Member
 
rsdata's Avatar
 
Join Date: Aug 2014
Location: Northern KY
Posts: 1,956
Quote:
lasted 17 hours. I guess that seems short to me!
You might be surprised that this quote is close to being correct.

You might make it 3-4 days with light (not constant ) usage...

You need to pack a cheap VOM to measure voltage and not drop those batteries to less than 12.1 to 12.2 VDC ( 12.7+ VDC is nominal @ full charge)... and then quickly (within 24-36 hours) charge them back up otherwise you will permanently compromise the batteries... that is you will never be able to get them back to 100% capacity again.

ASSUMING you are boondocking and not within a good earshot of your camping neighbors... I would get to a Harbor Freight and pick up one of their cheap $100-$120 generators (900 watts) and charge the batteries for 8 hours (about 1 tank of gas) at least once during your trip. Be sure to get a dogbone adaptor ( 30A to 15 Amp) for the TT hookup or get a separate charging appliance to hook to the batteries.
__________________


2014 Shamrock 183
2014 RAM 1500 Bighorn Crew Cab, HEMI, 3.21 gears, 8 Spd, 4X4
rsdata is offline   Reply With Quote
Old 05-21-2018, 05:08 PM   #4
Senior Member
 
Join Date: Feb 2017
Location: Spartanburg, SC
Posts: 278
The high tech guys will tell you that you should never run batteries down more than 50%. The low tech guys (like me) don't hesitate to run them flat, so I'd just isolate one battery and run whatever you want on the other. If that battery dies you'll know how long you 'should' go with two, and will also have a spare to bring that slide in when you break camp. I'm sure you'll also hear from the solar crowd - personally, I'm a generator kind of guy.
jeffnick is offline   Reply With Quote
Old 05-21-2018, 05:11 PM   #5
Retired Navy
 
Join Date: Mar 2018
Location: Afton, VA
Posts: 34
Quote:
Originally Posted by Wprather View Post
Was sort of hoping that they would get you through a long weekend and get the slide back in! Any feedback is appreciated. Thanks!
The instructions for my RV say to use the slide either under generator power, or under 30 amp plug in power. It indicates not under the house batteries only power. I would consider it under an emergency situation only, not a routine procedure.
__________________
2012 Lexington C Class
Toad: 2009 Honda Fit
Bob_K is offline   Reply With Quote
Old 05-21-2018, 05:15 PM   #6
Scoundrel
 
HangDiver's Avatar
 
Join Date: Feb 2017
Location: Salida, Colorado
Posts: 993
If you check to see how many amps each of your batteries are you can use the chart in the link below to guestimate your amp hour usage. Like some of the others stated above I never run my 2 12v batteries down below 50%.

RV Converters and Amp Draw - RV Information (RV Maintenance)
__________________
2014 Micro Lite 19fd
2015 F-150 Crew Cab, 4x4, Tow Package, 36 gal tank, 3.55 locking rear axle, road sofa package

Wooden Spoon Survivor
HangDiver is offline   Reply With Quote
Old 05-21-2018, 05:23 PM   #7
Senior Member
 
cavie's Avatar
 
Join Date: Apr 2016
Location: Port Charlotte Fl
Posts: 2,171
Run the refrigerator on GAS. Charge the batteries up and practice in the driveway. That will give you a good guess as to how long things will go.

If you doo buy a generator, read up on them in the search box. If you gonna boondock often I'd buy a Honda/Yamaha/Champion 2000 inverter/generator.

If one doesn't do it for you, you can buy a 2nd and run them in parallel. 4000 Watts. 1- 2000 will run your AC but not leave you for much else.
__________________
2002 27rk Wildcat 5er.
Port Charlotte Fl/Hinsdale Ma
Newley Retired.
cavie is offline   Reply With Quote
Old 05-21-2018, 06:19 PM   #8
Senior Member
 
Join Date: Feb 2018
Location: TEXAS
Posts: 235
No idea how long your batteries will last.

We're former tent campers, so we bring solar/battery powered lights, fans,radio, and a solar charger and charged battery pack for the phones.

Critical is keeping that battery up for the electric ignition for the refrigerator on propane and the water pump. I'd leave the lights off inside at night unless absolutely necessary. Your lanterns should do the job.
__________________
Happy Camping!

2015 Dynamax REV 24TB class C
2nd rig 2006 Toyota Tundra &
2010 Cikira 21RB 19' travel trailer
Reverse_snowbird is offline   Reply With Quote
Old 05-21-2018, 06:28 PM   #9
Junior Member
 
Join Date: Jun 2016
Posts: 6
In a pinch you can also plug into your tow vehicle and run it for a time. Works for retracting slide and/or awning.
henrypretz is offline   Reply With Quote
Old 05-21-2018, 06:53 PM   #10
Senior Member
 
Join Date: Nov 2017
Location: Dayton Ohio
Posts: 218
The math is easy.
Find the available amps on a battery. Likely a dealer installed battery is 85. Divided by two is about 43 available. 8 hours at 5 amps. 16 hours for two. No day two and three.

If you run them down more it damages them. I. E. They hold less. Should last 6-8 years or 18 months. Your choice.

Get a table with usage by item. Easy.

My solution is 4 six volts. 520 amps. 260 usable. Makes 3 days easy. We have 85 a day.
__________________

tomkatb is offline   Reply With Quote
Reply

Tags
batteries

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




ForestRiverForums.com is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 01:26 PM.