High Output alternator

[Tail_Gunner]

Re: High Output alternator

I am sorry, running what parallel?

Opps your battery's...here How to Connect Multiple Deep Cycle Batteries | eHow


I guess id better slow it down..One battery for the boat...two battery's for the audio..the audio battery's are isolated from the entire system...the amount of current needed to keep them up fresh is staggering..to get a ideal if one ran them dry and then charged them up in parallel @ 30 amp would take about 10 hour's/

 

[bruceb58]

Re: High Output alternator

Lol , yes you can say that. That is why i was hoping to put extra alternator

I still want to know how you figured out 160-180A. Seems VERY high.

 

[Kamilo]

Re: High Output alternator

Opps your battery's...here How to Connect Multiple Deep Cycle Batteries | eHow


I guess id better slow it down..One battery for the boat...two battery's for the audio..the audio battery's are isolated from the entire system...the amount of current needed to keep them up fresh is staggering..to get a ideal if one ran them dry and then charged them up in parallel @ 30 amp would take about 10 hour's/

Thank you

 

[Kamilo]

Re: High Output alternator

I still want to know how you figured out 160-180A. Seems VERY high.

I remember reading somewhere that 800W amplifier consume around 60W . I have 3, That is how i got 180. I am running 8ohm speaker as well, thank you

 

[bruceb58]

Re: High Output alternator

I remember reading somewhere that 800W amplifier consume around 60W .

Assuming you meant 60A, that would be the max an amplifier will draw assuming the outputs are saturated which never happens in real life. My bet that real life use on average would never exceed 25% of that.

How do you use this stereo? You sit in one spot with the engine off and stereo for long periods of time? How long do you run it when you do?

When you finally turn the engine on, How long do you think it runs before you finish for the day?

The reason I am asking all of this is that I am not convinced you need to do anything.

 

[Kamilo]

Re: High Output alternator

Assuming you meant 60A, that would be the max an amplifier will draw assuming the outputs are saturated which never happens in real life. My bet that real life use on average would never exceed 25% of that.

How do you use this stereo? You sit in one spot with the engine off and stereo for long periods of time? How long do you run it when you do?

When you finally turn the engine on, How long do you think it runs before you finish for the day?

The reason I am asking all of this is that I am not convinced you need to do anything.

With running engine i could do 2 hours. Seating just with engine on about 1,5h. With out engine on about 1h.

 

[Kamilo]

Re: High Output alternator

I am currently looking for some decent 120amp alternator. I see some on ebay and amazon for $150 but not sure if they are worth buying. I cant afford belmar.

 

[thumpar]

Re: High Output alternator

A 180 amp alternator will put out 2592 watts at 14.4v. I know they don't usually put out full power but that is way more power than you use and this is only if you have everything at full power which I doubt. With 8 ohms speakers you are not going to get full power from your amps either unless you are running the in parallel to get 4 ohms.

 

[bruceb58]

Re: High Output alternator

With running engine i could do 2 hours. Seating just with engine on about 1,5h. With out engine on about 1h.

So even with your current battery setup you will need your engine on. You do realize that to get the rated power out of the alternator, you will have to have the engine RPM up above 2500 RPM likely to get the full output of the alternator. So you are going to sit for hours at a time with your engine idling at this high RPMs?

 

[Kamilo]

Re: High Output alternator

A 180 amp alternator will put out 2592 watts at 14.4v. I know they don't usually put out full power but that is way more power than you use and this is only if you have everything at full power which I doubt. With 8 ohms speakers you are not going to get full power from your amps either unless you are running the in parallel to get 4 ohms.

Thnx, i have them hooked up so the jl is giving 8ohm to speaker. Are you saying that i should change connections to 4ohm?
Thank you

 

[Kamilo]

Re: High Output alternator

So even with your current battery setup you will need your engine on. You do realize that to get the rated power out of the alternator, you will have to have the engine RPM up above 2500 RPM likely to get the full output of the alternator. So you are going to sit for hours at a time with your engine idling at this high RPMs?

Well. I was hoping that i can do mix seat and run to charge batteries. I usually move from spot to spot.
If i could safely install and use 120amp alternator then i would go with it and then see how that goes. I will put amps output a bit down to save some juice. Do u think that this would a good option for now?
Thnx

 

[bruceb58]

Re: High Output alternator

I will put amps output a bit down to save some juice.

The amount of current you draw is in direct proportion to how loud you have the sound turned up.

 

[thumpar]

Re: High Output alternator

Thnx, i have them hooked up so the jl is giving 8ohm to speaker. Are you saying that i should change connections to 4ohm?
Thank you

An 8 ohm load will not draw as much current. Most amps (except home amps) are rated for 4 ohm or less. As you go lower some are designed to give full power. I had some that where 1/4 ohm stable and you had to get to 1 ohm to get the most out of them.

 

[bruceb58]

Re: High Output alternator

Out of curiosity, what's the model number of your amp?

 

[Kamilo]

Re: High Output alternator

Out of curiosity, what's the model number of your amp?

1. M4500
2.M6450
3.A1800

3 pieces

 

[Kamilo]

Re: High Output alternator

An 8 ohm load will not draw as much current. Most amps (except home amps) are rated for 4 ohm or less. As you go lower some are designed to give full power. I had some that where 1/4 ohm stable and you had to get to 1 ohm to get the most out of them.

Thank you

 

[thumpar]

Re: High Output alternator

1. M4500
2.M6450
3.A1800

3 pieces

The M4500 is 80 X 4 RMS
The M6450 is 45 X 6 RMS
The A1800 is 1000 X 1 RMS but at 1 ohm

RMS is the way you want to look at the ratings. That is the constant power they can put out. Anything more than that is just a peak and not sustained. I think a 120 amp alternator would be more than enough with the 2 stereo batteries unless you plan to sit all day and night at full volume without running the engine. If you really want to check how much power you are pulling they make a clamp on a meter that will give you the RMS at the speaker.

 

[fishrdan]

Re: High Output alternator

So even with your current battery setup you will need your engine on. You do realize that to get the rated power out of the alternator, you will have to have the engine RPM up above 2500 RPM likely to get the full output of the alternator. So you are going to sit for hours at a time with your engine idling at this high RPMs?

The OP will need to check the alternator specs as it could put out a significant amount of power off idle. I have a 105 amp alt that supposedly puts out 60 amps at idle. I'm pretty sure it's close to 60 amps as it really lugs down the engine when I'm charging my trolling batteries,,, while trolling off the main (idling).



I wouldn't be too thrilled about having to run the engine to listed to the stereo, carbon monoxide, drunk falling on shifter, etc...

 

[bruceb58]

Re: High Output alternator

The M4500 is 80 X 4 RMS
The M6450 is 45 X 6 RMS
The A1800 is 1000 X 1 RMS but at 1 ohm

Next question, do you actually have 10 speakers hooked up to the top 2 amps?

 

[Kamilo]

Re: High Output alternator

This are great comments thank you! I will be moving form place to place. I just dont like batteries to be drain at half a day with out possibility to charge them. And yes even that we r not drinking to much anything can happened...
So i just would like to have possibility even with stereo off for some time to recharge while cruising. Happy that 120 would be the way to go!