Power requirements
By Lizzy - usenet poster
I'm posting this for a friend, so please reply to the address below.
--
Hello there,
I've bought a couple of amplifiers for my car, but when reading the specs I
found out I might not be able to feed 'em. Together both of my amplifiers
need 55A. My battery is 36A and the alternator is 45A. I'd like to know:
1. Is this is a problem even when playing with the engine running?
2. What's the max battery I can install without having to change the
alternator? I read in a magazine the alternator always needs some extra
power over the battery, but the magazine did not state how much. Can I
for example fit a 44A battery?
Is it true my alternator will suffer when I install a 45A or even
bigger batery?
Thanks for your time,
-Ivo
+///++
| Only AMIGA /// makes | Internet: |
| \\\/// it | notice : This is a shared account, please |
| \XX/ possible | use "ToIvo" as the subject header|
+++
--
Hello there,
I've bought a couple of amplifiers for my car, but when reading the specs I
found out I might not be able to feed 'em. Together both of my amplifiers
need 55A. My battery is 36A and the alternator is 45A. I'd like to know:
1. Is this is a problem even when playing with the engine running?
2. What's the max battery I can install without having to change the
alternator? I read in a magazine the alternator always needs some extra
power over the battery, but the magazine did not state how much. Can I
for example fit a 44A battery?
Is it true my alternator will suffer when I install a 45A or even
bigger batery?
Thanks for your time,
-Ivo
+///++
| Only AMIGA /// makes | Internet: |
| \\\/// it | notice : This is a shared account, please |
| \XX/ possible | use "ToIvo" as the subject header|
+++
Solution #1
posted on Aug 01, 2007
pandamama - usenet poster
Rank:
Apprentice
Rating: 0%, 0 votes
ApprenticeRating: 0%, 0 votes
(Anton H.J. Koning) writes:
I'm replying to everyone instead...
First of all, I think it's more likely to say that both amps CAN DRAW 55
amps, not NEED 55 amps. At low listening levels, they won't draw
anywhere near that much.
Probably not in most cases. At high volumes, you will probably be able
to drain the battery, but if you listen to them at full output for that
long, you are probably parked somewhere, and hopefully you can get a
jumpstart from someone parked nearby. Otherwise, you're probably deaf by
that point, and starting the car is the least of your headaches.
I would think that you could install as big a batter as you want...
My bug had two batteries in it, with the stock alternator. I only had
problems when I listened to it with the engine off for long periods,
and/or at high volume. Total fuse ratings for the ampifiers = 65A.
I don't know how powerful the stock bug alternator is, but I doubt it's
more than 45A or so.
Hope this helps.
--
Your VCR blinks "12:00" all day long? But you're using the internet?
#
I'm replying to everyone instead...
First of all, I think it's more likely to say that both amps CAN DRAW 55
amps, not NEED 55 amps. At low listening levels, they won't draw
anywhere near that much.
Probably not in most cases. At high volumes, you will probably be able
to drain the battery, but if you listen to them at full output for that
long, you are probably parked somewhere, and hopefully you can get a
jumpstart from someone parked nearby. Otherwise, you're probably deaf by
that point, and starting the car is the least of your headaches.
I would think that you could install as big a batter as you want...
My bug had two batteries in it, with the stock alternator. I only had
problems when I listened to it with the engine off for long periods,
and/or at high volume. Total fuse ratings for the ampifiers = 65A.
I don't know how powerful the stock bug alternator is, but I doubt it's
more than 45A or so.
Hope this helps.
--
Your VCR blinks "12:00" all day long? But you're using the internet?
#
Solution #2
posted on Aug 01, 2007
Jimmy NY - usenet poster
Rank: Apprentice
Rating: 0%, 0 votes
ApprenticeRating: 0%, 0 votes
These are peak ratings.
Idle ratings of amplifiers range from 3amps to 11 amps (Adcom GFA-4404/4702)
The PPI 2300AM has an idle current of 10 amps.
PPI A600 6 amps.
I will guess that the idle current of your amps are 5 amps each.
An easy way to estimate average current draw is listed just below.
I don't think you need to worry about changing battery or alternator
unless you add another amp or two.
The amplifier ratings are at peak power. The normal draw of the amplifiers will be
significantly less. Figure that the constant (average) draw of your amplifier will
be the idle current plus 1/3 the difference between the max and idle.
I will estimate that with a 55 amp peak your constant draw will be about 25 amps.
To tell the truth, I wouldn't worry too much about changing the front battery.
If you decide to add a 3rd and/or 4th amp later, you might want to use an
isolator to split the alternator current between two batteries: one for your
car and one for your stereo. Uprgrading the alternator will also help, but if
you have a battery charger and use it every month or so, you shouldn't have any
problems with a multi-battery setup.
No. Not really.
---
| justin.grochoski |*| Hope.College |*| |
| Phoenix Gold, Adcom, Precision Power, Alpine, Pioneer, |
| MB Quart, Canton, These are the things my dreams are made of.|
Idle ratings of amplifiers range from 3amps to 11 amps (Adcom GFA-4404/4702)
The PPI 2300AM has an idle current of 10 amps.
PPI A600 6 amps.
I will guess that the idle current of your amps are 5 amps each.
An easy way to estimate average current draw is listed just below.
I don't think you need to worry about changing battery or alternator
unless you add another amp or two.
The amplifier ratings are at peak power. The normal draw of the amplifiers will be
significantly less. Figure that the constant (average) draw of your amplifier will
be the idle current plus 1/3 the difference between the max and idle.
I will estimate that with a 55 amp peak your constant draw will be about 25 amps.
To tell the truth, I wouldn't worry too much about changing the front battery.
If you decide to add a 3rd and/or 4th amp later, you might want to use an
isolator to split the alternator current between two batteries: one for your
car and one for your stereo. Uprgrading the alternator will also help, but if
you have a battery charger and use it every month or so, you shouldn't have any
problems with a multi-battery setup.
No. Not really.
---
| justin.grochoski |*| Hope.College |*| |
| Phoenix Gold, Adcom, Precision Power, Alpine, Pioneer, |
| MB Quart, Canton, These are the things my dreams are made of.|
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