How much watts rms does your stock alty handle?

[Nico Koutouzis 10+ year member]

It's a 110 a stock alty from a 2004 infiniti g35 coupe. Pretty much the same altu as the 350 z

 

[dragon.breath 10+ year member]

i have a 85 amp alternator, two optima 34/78 yellow tops and the big 3. i am running a total of 1850 watts rms. my running voltage rarely falls below 13.5 volts and never goes below 13 volts.

 

[Nico Koutouzis 10+ year member]

Then I should be all good just a good battery up front cause I don't know what's there now (ill check) and the big 3 and I could be jammin

 

[smgreen20 10+ year member]

This very Q was in a recent issue of PA&S mag.

It was said that your vehicle will use on average 60% of the alt that's stock. So the rest is just math. As it was stated above, as well in the mag, that your listening styles and vehicle will be different for everyone.

So for you, a base reading if you will, is as follows:

110 ampere alt- 66 amperes (the vehicles 60%) that leaves you with 44 amperes.

44 x the avg voltage output of 14.4v = 633.6 watts

So you have up to 633.6 watts via this method of CONSTANT output available. With typical music this is not a problem and could expect 2x that output before you'll need to upgrade the electrical. In short that's 1267.4 watts worth.

BUT, there's another thing we have to consider, your AMPS efficiency. That will need to be considered too.

 

[Nico Koutouzis 10+ year member]

**** need more power!!!!

 

[lowriderram_95 10+ year member]

I was runnin 4k on stock alt but with the 4 dekas added. Bout to switch to two sprinter 370's for a little more batt capacity. And yes I do plan to upgrade alts soon

 

[Crownvicon28s 10+ year member]

OP How much power are you running now? Any voltage drop? Are you running an amp on your mids? I would do the big 3 if you were to upgrade in power or not, then add a new/2nd battery as needed. As mentioned earlier this will vary from car to car. You could try it and if you get substantial drops you can make the necessary adjustments.

 

[Nico Koutouzis 10+ year member]

If I get a good amount of drop I can just wire the subs at 4 ohms coming out with 1000 rms instead of 1500

 

[Crownvicon28s 10+ year member]

sorry. dbl post.

 

[Nico Koutouzis 10+ year member]

Yea I found a Ho alt on eBay rated at 220 amp by powermaxx USA for 250 shipped

 

[Nico Koutouzis 10+ year member]

BTW both amps are mb quart onyx amps.

 

[IonRL205 10+ year member]

If I get a good amount of drop I can just wire the subs at 4 ohms coming out with 1000 rms instead of 1500

The ONX1.1500D is 500 watts RMS at 4 ohms, not 1000. It does 1000 at 2 ohms.

 

[audioholic 5,000+ posts]

I always hate these threads, because while the people in them are trying to be helpful and mean well, they end up giving information that may or may not apply to someone elses situation. A stereo does not create a static current draw. The type of music you listen to, how loud you listen to it, and even how often you listen to the stereo while the engine is running, all contribute to whether or not a specific alt will be able to handle a specific stereo/user.

Like I said, no offense to you guys who are trying to help the OP, just saying...

 

[snoopdan 5,000+ posts]

stock 90 amp alternator here and 5kw .... and 7 group 31's in parallel.

 

[bgowdy 5,000+ posts]

i have a stock 100a alt with 2400. 1 batt under hood and 1 in hatch(cant remeber name lol) idles @ 14.7 or 14.8v. drops to 13.1v full tilt(wile @ idle)