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  #1  
Old 12-25-2011, 02:56 PM
MorphinRedRanger MorphinRedRanger is offline
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Lightbulb How much can my battery take?

ok well I currently got 2 fog/driving lights hooked up to the battery and my sub. I wanted to add 2 more lights under them, same exact ones and also cab lights on my roof, and to top it off 2 little fog lights in the rear bumper. do you think that my battery can hold all that or will i have to get a better one. i know it depends on what kind of battery i got but lets just say its a normal run of the mill one. ok thanks everyone!
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  #2  
Old 12-26-2011, 12:46 AM
skulldrinker skulldrinker is offline
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Default Re: How much can my battery take?

They all put out 12 volts is what I suspect everyone is trying to tell you. The difference between them is their amperage output. Amperage is the thing you're to be concerned with here.

The total amperage usage of all your lights and stock accessories must be less than what your alternator is putting back into the battery. Otherwise with everything turned on you will run down the battery eventually.

Start out by finding out how many amps your alternator puts out. If it is an 100 amp unit then you can run 100 amps of lights and accessories and stay even. Just remember that a 100 amp alternator only puts that out at a certain RPM. So when you're sitting at a stop light or you're parked idling or have the motor shut off you will be in the dark as soon as your battery gives you all it's amperage it was storing. Just like when a flashlight goes dead. Now if you had a rechargeable flashlight and you plugged it in you could run the flashlight all day because the charger is charging the batteries faster than the bulb is burning up the juice. Know what I mean?

Many ways to prolong the length of time before the battery goes dead. Get a bigger alternator, get a larger capacity battery (or connecting two together for example) increasing the available amperage not the voltage, and keep the motor running.
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Last edited by skulldrinker; 12-26-2011 at 12:56 AM.
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Old 12-26-2011, 01:20 AM
pooleo pooleo is offline
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Default Re: How much can my battery take?

I would start by making sure all your fogs are wired to relays! I recently found the benefit of using relays, I never did in the past. Next, I would upgrade your alt. Assuming your battery is good. I just bought a yellow top optima, that thing it grrrrrreat!
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Old 12-27-2011, 05:48 PM
oldcarfart oldcarfart is offline
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Default Re: How much can my battery take?

add up all your electrical accessory amperage draw and this is what your system needs to maintain, use the battery with highest CCA you can fit so the battery does not have to work at maximum all the time, same with alternator, go with highest amp output you can find. The battery starts the vehicle, the alternator carries the load.

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Quote:
Originally Posted by Superlifted06FX4 View Post
So a 325CCA lawnmower battery has the same amperage as a 1000CCA?
no way, but my jumper box has a motorcycle battery in it, it will start a car or two but then needs recharge.
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Old 12-27-2011, 06:20 PM
FireRanger FireRanger is offline
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Default

Your battery has nothing to do with anything. It is for starting the engine and powering accessories while the engine is off. It is your ALTERNATOR that provides power while the engine is running. If you have a standard 90 amp alternator, figure on having about 30 amps of extra juice. If you have more than 30 amps of extra stuff, you will need a higher capacity alternator.

[Posted with my Android mobile device using Tapatalk Pro]
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Last edited by DieHard4rd; 12-28-2011 at 11:55 AM.
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Old 12-27-2011, 07:02 PM
FireRanger FireRanger is offline
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Last edited by FireRanger; 01-02-2012 at 06:42 AM.
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  #7  
Old 12-27-2011, 07:14 PM
FFparker FFparker is offline
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Default Re: How much can my battery take?

Thank you sir
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  #8  
Old 12-30-2011, 05:58 PM
MorphinRedRanger MorphinRedRanger is offline
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Default Re: How much can my battery take?

thanks guys i think imma get a bigger Alt.

----------

i was checkin on ebay on bigger alt. do you think a 250 amp one will do the trick?
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Old 12-30-2011, 06:09 PM
FFparker FFparker is offline
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Default Re: How much can my battery take?

You never said you were having any troubles in the first place?
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Old 12-30-2011, 11:03 PM
FireRanger FireRanger is offline
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Default Re: How much can my battery take?

Haha. Ya man, sean makes a good point. You don't need a bigger alternator just because you're adding two new lights. If these are all 55 watt lights, chances are you're stock alternator will be fine.

Turn on all the lights, the HVAC, windshield wipers, and AC. See if the voltage at idle is 13.2 to 14 volts. If so, you're doing fine.
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  #11  
Old 01-01-2012, 06:28 PM
peppy121 peppy121 is offline
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Default Re: How much can my battery take?

just put on one size bigger alt from facory that you have and you be fine
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Old 01-01-2012, 07:05 PM
Superlifted06FX4 Superlifted06FX4 is offline
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Default Re: How much can my battery take?

as i said in my deleted posts. id recommend getting a capacitor to smooth out voltage spikes and since it will respond faster when your sub hits. and ford alternators usually are underrated from the factory. if you have the 95 amp 3g alt, i would upgrade to a 130 amp, which usually puts out 180 amps.
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Old 01-01-2012, 08:26 PM
FireRanger FireRanger is offline
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Default Re: How much can my battery take?

Quote:
Originally Posted by Superlifted06FX4 View Post
as i said in my deleted posts. id recommend getting a capacitor to smooth out voltage spikes and since it will respond faster when your sub hits.
You could do this if you don't want it to work right and desire dead batteries, and dim lights. A capacitor has nothing to do with lighting and other continuous current drawing devices. They are a bandaid for improperly designed stereo systems. Not lights.
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  #14  
Old 01-01-2012, 09:06 PM
Superlifted06FX4 Superlifted06FX4 is offline
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Default Re: How much can my battery take?

Quote:
Originally Posted by FireRanger View Post
You could do this if you don't want it to work right and desire dead batteries, and dim lights. A capacitor has nothing to do with lighting and other continuous current drawing devices. They are a bandaid for improperly designed stereo systems. Not lights.
I work in an alternator shop, if you hook it up right, they will not give you problems and will keep your lights from dimming when the sub hits. Your alternator can not react fast enough.
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Old 01-01-2012, 09:15 PM
FireRanger FireRanger is offline
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Default Re: How much can my battery take?

Except this thread is about adding additional lights to his truck. Not adding additional subwoofers. A capacitor and/or stereo equipment have nothing to do with this at all.
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How to: Aux light wiring, relays, & fuses
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