what type of up graded alternator should i use

[biggris79]

im looking to up grade my alternator on a 08 san 220 i have a 100 amp one right now im running 6 amps on my system i think its putting out about 2400 watts @4ohms what size of Alternator should i use i have 3 batteries right now

[bchesley]

RE: what type of up graded alternator should i use

If you do upgrade I want your used one. Thanks.

I know thread hijack, but I need a 100 amp cause my 55 amp is hurting...

[nauty220]

RE: what type of up graded alternator should i use

Why are you looking to upgrade your alternator?

[biggris79]

RE: what type of up graded alternator should i use

I have added the pair of the pro 80s with the pair of the 485s and every tower speaker has its own amp now and i added 500 more watts to my sub and more power to my speakers inside the boat and i put the 800 abyss lights on to and lights on the 80s and lights on the horns on the 485s

[nauty220]

RE: what type of up graded alternator should i use

I ask because I have recently added leds as well, its garrett with the blue and white 220 by the way. I added a 3rd optima battery and im nervous about them being drained. Are you having a problem maintaining voltage? I was , and havent tested since adding 3rd battery

[Andrew]

RE: what type of up graded alternator should i use

i would have a hard time believing that led's will draw very many amps.... i don't have any experience with those high output systems though...

[biggris79]

RE: what type of up graded alternator should i use

I had 3 batteries last year it didnt drain my to bad i got about 4 to 6 hrs but then i started leaving my boat running and i could crank all my speaker with my sub and i didnt have any problems.But i think with the more power and speakers and more amps i might not be able to keep everything going all day.

[Chexi]

There is a balmar 240 amp upgrade, but it is quite expensive (4 figures).
See this thread.

http://planetnautique.com/index.php?...sc&start=0

[AuMDLST]

At some point do you think that only having the 12v (while at engine off) available rather than the 14.4 (while charging) is going to cause issues?
I only ask because I'm at roughly 2000 watts rms with factory 100 amp alt and two batteries (factory interstates, soon to be replaced) and have no issues playing
for several hours.
I know that with the batteries just slightly drained (still enough to start without hesitation)(engine off)(not sure of the remaining voltage) the sub does not hit as hard (indication to start motor).

[Chexi]

I would carry a portable jump start if you use both your audio and cranking battery to power your audio when the motor is off (or even idling for that matter).

[kaikane]

Word of caution about upgrading to anything more than a 100 amp alternator without upgrading your stock wiring...your wiring will be a ticking time bomb under a high amp load. As both an RV/Nautique owner, i would suggest addressing your power supply issues in a safer, more efficient manner than doubling or tripling the alternator output.

There are essentially three types of batteries out there: Starter Batteries (for short intense voltage draws, not long power draws), Marine batteries (can act as starter battery and has some deep cell characteristics), and a True Deep cell battery (made to supply power for long current draws). Think about how long your car battery last if your trying to start a car...a few minutes of cranking and the thing is dead. Then think of an electric golf cart...you can drive those things all day on a single charge. Cars use starter batteries, golf carts use deep cycle batteries.

I would look at adding a properly isolated true Deep Cell battery (120 Amp Hour of greater) or two to your battery bank and stop worrying about having enough power to start the boat. You can even install a perko switch to help further isolate the starter & deep cycle battery. In order to calc out how much battery power you will need rember this formula (#of Amps * 20 = Number of amp hours used per 60 minutes of operation). For example my system uses 10amps * 20 = 200 amp hours. So if I wanted to play my stereo for 2 hours without charging the batteries i would need over 400 amp hours of capacity to keep the system running.

Beef up your battery bank capacity to match at leas 75% of your max power needs. From there, the next thing to remember is your batteries need 10% of their amp hour capacity to properly charge. So a 200 Amp hour battery needs a minimum of 20amps to properly charge back to capacity. So, figure out what your maximum totla amperage requirements will be from your system and that will tell you how big your alternator should be. For example, running boat pulls roughly 25amps on average, stater battery takes constant 10 amps, modified stereo is 20 - 30 amps, one additional 200 AH deep cell takes 20 amps to charge. give yourself 5 amps to spare and you only need a 90 amp alternator to efficiently charge the system.

Feel free to add all the amps you want...your real problem is capacity not size of the alternator.

[Chexi]

If you are going to isolate (recommended), think about the Blue Sea ystem.

http://bluesea.com/category/2/productline/overview/329

[biggris79]

I founded out by changing your alternator you void your warranty and you could have problems with the electrical system & computers.I decide to go with 3 battery banks 1 battery for the starting battery and 2 more banks with 2 batteries on each bank with volt meters on each battery with a perko between all the banks.Im going to have 5 batteries.