Dual battery -- why bother? - Toyota FJ Cruiser Forum
Newbie Discussions A flame free zone

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 48 (permalink) Old 08-15-2013, 12:28 PM Thread Starter
Forum Regular
 
maxtor's Avatar
 
Join Date: Mar 2011
Location: Sharjah, UAE
Posts: 227
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
(Thread Starter)
Dual battery -- why bother?

As far as I know, the battery in a car is only needed to start the engine. Once the engine starts, the power needed to run the radio, speakers, and all fancy electrical components, are all powered by the alternator.

To me it seems if one needs more power (due to added equipments that need more power), one needs a better alternator.

Could someone tell me what's going on?
maxtor is offline  
Sponsored Links
Advertisement
 
post #2 of 48 (permalink) Old 08-15-2013, 12:32 PM
Forum Superstar
 
2010armygreen's Avatar
 
Join Date: May 2010
Location: Washington State
Posts: 7,367
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 625 Post(s)
Re: Dual battery -- why bother?

Winching is going on. Winching uses alot of battery
As is running Fridges. Able to run fridges for days on end
And lots of other accessories.

>>>>>>>>>>2010armygreens slow build<<<<<<<<<<

>>>>>>>>ArmyGreens M416 Build<<<<<<<<




Garage
2010 FJ Army Green
2014 FJ Iceberg
M416 Trailer
Maggiolina Grand Tour Roof Top Tent
2010armygreen is offline  
post #3 of 48 (permalink) Old 08-15-2013, 12:54 PM
Forum Superstar
 
sinerasis's Avatar
 
Join Date: Mar 2009
Location: Washington
Posts: 2,032
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Garage
Re: Dual battery -- why bother?

Think of all the power your rig uses as a river.

The river is fed by a lake (battery), so naturally if your river gets big enough, the lake will dry up.

Your alternator is like another river, which feeds the lake. Your alternator works when the engine is running, so your lake can only fill at those times.

Lights, stereos and stuff that you generally use only when the rig is on would benefit from a larger alternator, as the lake wouldn't need to be used as much.

Winches (which pull more power than any alternator can possibly supply) benefit from a larger lake (battery). This goes for anything that you plan to use while the engine is off too.

sinerasis is offline  
Sponsored Links
Advertisement
 
post #4 of 48 (permalink) Old 08-15-2013, 01:13 PM
Forum Veteran
 
FJ_Xplore's Avatar
 
Join Date: May 2012
Location: Lee's Summit, MO
Posts: 522
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 15 Post(s)
Garage
Lifetime Supporting Member
Re: Dual battery -- why bother?

I agree with 2010army green, winching will discharge the battery faster than the alternator can recharge it (if use is prolonged) and a fridge for a few days can drain enough battery to keep it from starting. Getting a jump start in the woods can prove difficult! Plus, it's cool.


2011 Army Green Trail Team SE - Custom XPLORE Package
XPLORE Vehicles
FJ_Xplore is offline  
post #5 of 48 (permalink) Old 08-15-2013, 01:24 PM
I Have a V-8!! Moderator
 
BIGGUY's Avatar
 
Join Date: May 2006
Location: WY
Posts: 28,832
Mentioned: 353 Post(s)
Tagged: 3 Thread(s)
Quoted: 7041 Post(s)
Garage
Lifetime Supporting Member
Re: Dual battery -- why bother?

If you are out somewhere and your battery fails, you're done. If you have dual batteries you can use the second battery to get you back to where you are going. I had to use mine this way for a few days until I could replace my main battery that died.

Go ahead, skin it! Skin that smoke wagon and see what happens...

I'll ride in on a sunny day, Sing you a song, steal your heart away Like a cowboy Hang my hat like I'm here for awhile Kick off my boots and drive you wild Like a cowboy Well baby you know I can't stay long You wake up, I'll be gone Until then I'll hold on Like a cowboy.

TLCA #9031
BIGGUY is offline  
post #6 of 48 (permalink) Old 08-15-2013, 01:29 PM
Forum Veteran
 
Join Date: Aug 2010
Location: Tempe Az
Posts: 639
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Re: Dual battery -- why bother?

To power the fridge!
huckfinn is offline  
post #7 of 48 (permalink) Old 08-15-2013, 01:35 PM
Forum Veteran
 
Join Date: Jul 2013
Location: Huntington Beach, CA
Posts: 356
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Garage
Re: Dual battery -- why bother?

Quote:
sinerasis previously said: View Post
Winches (which pull more power than any alternator can possibly supply) benefit from a larger lake (battery). This goes for anything that you plan to use while the engine is off too.
Is second battery mandatory if you plan on using a winch?
FJFreddie is offline  
post #8 of 48 (permalink) Old 08-15-2013, 02:25 PM
Forum Superstar
 
Lmmmmm's Avatar
 
Join Date: Apr 2011
Location: Kirkland, WA
Posts: 6,607
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 137 Post(s)
Garage
Lifetime Supporting Member
Re: Dual battery -- why bother?

No. But, using a winch will drain your OEM battery pretty quick.

I use a single PM-1 battery and carry a Jump N Carry. I didnt want to deal with 2 batteries.

Quote:
FJFreddie previously said: View Post
Is second battery mandatory if you plan on using a winch?

2011 NSSE - Icon coilover - TotalChaos UCA - SAW rear coils - OME 895 rear medium shocks - Metal Tech slider - Metal Tech tube bumper - Viper Elite 10k Winch - PIAA 520 ATP - Midland 75-822 CB - Boztec antenna mount - Duratrac 285/70x17 - Scuba Mod - Ricochet skids - PIAA dual horn 400/500 - sPOD - Ellis Stealth Shift Knobs - MPAC rear/side rack - PLX Kiwi Bluetooth OBDII - Nestah Edition Firestik Radio Antenna - National Luna Single Battery Monitor - Tantrum Rock Lights - Outrider Shock Armor - Toy Outfitter LCA - Switched DRL's - Front rock cameras - Custom Rear Cargo Storage - Platinum PM-1 Battery - Raingler Cargo Nets - 10LB Powertank
Lmmmmm is offline  
post #9 of 48 (permalink) Old 08-15-2013, 02:58 PM
Forum Superstar
 
sinerasis's Avatar
 
Join Date: Mar 2009
Location: Washington
Posts: 2,032
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Garage
Re: Dual battery -- why bother?

Another reason is you can use a second battery as a backup. You'd have your "primary" battery, that does all the work under normal conditions and a "auxiliary" battery that is just maintained.

If for some reason your primary battery dies, you can switch over to your aux and still start your engine.

sinerasis is offline  
post #10 of 48 (permalink) Old 08-15-2013, 03:25 PM
Forum Veteran
 
Join Date: Jan 2013
Location: Alberta
Posts: 613
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 87 Post(s)
Re: Dual battery -- why bother?

Quote:
sinerasis previously said: View Post
Another reason is you can use a second battery as a backup. You'd have your "primary" battery, that does all the work under normal conditions and a "auxiliary" battery that is just maintained.

If for some reason your primary battery dies, you can switch over to your aux and still start your engine.
^^^^^^ this

already self-boosted once

makes you wonder why all cars don't come with a 2nd battery?!
hiflyerx is offline  
Reply

  Toyota FJ Cruiser Forum > Newbie Town > Newbie Discussions

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Toyota FJ Cruiser Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome