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Battery Voltage?

 
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Old 08-31-2009, 05:55 PM
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Battery Voltage?

Im just curious, my battery voltage on the vafc was always 14.1 or 14.2 or start up or idle.

Now its 12.6 but it seems like it idles fine..... but is this something i should worry about?

I noticed this after i installed my mtx amp, when it use to hit the rpms would drop like 100-200 on idle.

Then i had to jump my dads car in florida (weird he always has to help me now im helping him !! LOL)

anyway do you guys think my battery is warned out from all this???

Right now i had a sony xplod amp, and i always had it so its not draining that much out of my battery..its a sony, and since this just happened today it was during the day..so none of my lights were on or i cant see anything else drawing a little bit more electricity then the sony amp and radio.

Is 12.6 something i should worry about when im at a light? like i should be reving it up so i dont stall out, or is that ok????

Thanks! i only put this in general tech since all gens have a battery lol
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Old 08-31-2009, 11:07 PM
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Re: Battery Voltage?

Where are you measuring it from? Where you measure the voltage makes a difference on how it reads.
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Old 09-01-2009, 12:30 AM
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Re: Battery Voltage?

the vafc the reading its giving me it drops to 12.6 then it boosts itself up to 13 and climbs all the way to 14 then drops back to 12.6 noticed this quite a few times today
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Old 09-01-2009, 03:18 PM
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Re: Battery Voltage?

I was told that it's normal. Maybe it's just me but that my cap has a read meter on the top and it also jumps depending on how how hard you push it. Mine varies from 12-14 in matters of seconds!!!
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Old 09-01-2009, 04:51 PM
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Re: Battery Voltage?

Alternators have many myths that revolve around them, lets lay one or two to rest real quick. If you have a 100Amp alternator and you have a 100Amp battery this does not mean your alternator will charge your battery from dead to full in 1 Hr (not that the engine could get started from a dead battery this is just for instance).

Alternators typically work in cycles, when your engine has been off for a while and your battery is at rest voltage should be 12.6-12.7V. If your battery was recently charged it would rest at 13V or maybe a little over but after it sits for a while it will go back down to 12.7. When you start your engine your alternator will kick in, usually full blast, bringing the voltage to around 14 +/- a small bit. The alternator will continue to run full blast until it reaches a certain temperature, then it puts out like 5-10% of what it is rated (voltage also drops here, possibly as low as 12.6) at until it cools off enough to run full blast again. The ~10% is enough to run all STOCK accessories in your car with ease. It will take a very long time to charge a dead battery from dead to full, that's what battery chargers are for.

Long story short: I wouldn't want to replace anything if it wasn't broken and if your alternator wasn't working you would know because as soon as you started your engine and ran that amp for a while your battery would be dead, so your car would die because your alternator wasn't charging it. All of your electronics are routed through the battery. Your battery acts as a voltage regulator so that when your alternator spikes to like 14.5V your headlights don't pop, the battery will still output a steady 12.6-12.7V. This means if your battery dies your whole car will die because everything depends on that battery.

Your battery might be on it's way out too and it's hard to know without testing it.
To test your battery you have two options:
1) take your car to autozone, or wherever offers that service, and have them load-test your battery.
2) ghetto-style. grab a volt meter and establish a baseline voltage on your battery (12.7V+ is 100%) and have someone sit there and hold the voltmeter on as you crank the engine. If you crank the car and the voltage drops to 0 really fast then you have a bad cell. A good battery will sustain over 10V under full crank load. If your battery is dropping below 9.5V under crank then your battery is sulfated and will need to be replaced soon enough anyway. Once the engine turns over and is running if your alternator is working the voltage on your battery will rise (13.8-14.5V is typical of most alternators).

I can also explain battery maintenance and any terms you don't understand such as sulfation, bad cell, etc. Feel free to ask, that is my specialty.

I personally have over a 800W system (Mostly JL) and use a Odyssey PC1200 battery that I regularly pulse, with a pulsetech xtreme XC-100P, to maintain full capacity and cranking potential. I am a battery nerd, please direct all related questions to me.
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Old 09-01-2009, 04:56 PM
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Re: Battery Voltage?

After typing my post and reading it over I'm sure I gave way too much information, but I would rather too much then not enough. Plus you never know when this type of knowledge could be handy. Sorry if I bored you, but if you got what I said then congratulations.
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