quote:

Originally posted by astroboy I've recently been voted into a student committee, and I'm basically in charge of organising all the parties. I want to appropriate some cash for a gasoline generator to power a basic dj setup, (decks, mixer and a couple of powered speakers) so I can throw some beach parties andwhat not. Any recommendations as to the kind of generator I will need and how much it would cost or where to buy it would be much appreciated. I've posted this in the COR, but thought I'd post here as well just to get some local info on retailers etc... Cheers!

we sell small ones at bunnings, how powerful is the gear you want to run?

Probly only two 800W speakers, plus decks and mixer. I guess it'd have to have some kind of voltage regulator to stop it from blowing the equipment, and it'd have to be portable and reasonably quiet.

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dont think we stock anything that would be big enough, its probably worth giving your local store a call cause they can be special ordered in, i know dewalt makes some pretty beefy generators, i am unsure how suitable they would be for stereos with the surging power and all though, like you said you need one with a decent amount of voltage stabilisation

quote:

Originally posted by astroboy Probly only two 800W speakers, plus decks and mixer. I guess it'd have to have some kind of voltage regulator to stop it from blowing the equipment, and it'd have to be portable and reasonably quiet.

i think there's not a lot of outdoor party people here, Astroboy

try www.oztrance.com

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My suggestion would be the DC/AC inverters operated from a car battery as they would be cheaper at required power levels!!! (I assume u gonna need at least couple of Kilowatts of power depending on the size of the event though). May have to run the cars from time to time to recharge the batteries though
Jaycar electronics has a variety of them. There are a couple of really large models which I think adequetly can supply power levels required. If required more than two units can be utilized!
Cheers......

quote:

Originally posted by Tranceilvania Anything Electrical/Electronics ask your questions here!==> http://www.austech.info/forumdisplay.php?f=76 My suggestion would be the DC/AC inverters operated from a car battery as they would be cheaper at required power levels!!! (I assume u gonna need at least couple of Kilowatts of power depending on the size of the event though). May have to run the cars from time to time to recharge the batteries though Jaycar electronics has a variety of them. There are a couple of really large models which I think adequetly can supply power levels required. If required more than two units can be utilized! Cheers......

i doubt you are going to be able to use cars for this, i know my alternator puts out something like 60-70A peak, at idol its probably only something like 40A, 40A at 12V is only 480w, this is probably a generous estimate too considering the car electrics will use some of this power, this is not even going to be enough to run the equipment let alone charge the batteries back up too.

Also completly draining standard car batteries isnt good for them, it will shorten their useful life and the amount of power they will store.

So either use cars with big alternators and good batteries that are designed to be deep cycled like the optima yellow ones or ditch this idea

Hey do not underestimate the car batteries, they minumum put out a whopping 300A power without the help of an alternator. A good size battery providing that the car runs on idle should last very long hours no problems! A generator would be better but the price range for a good one would be prohibitive.
Plus most hi-power inverters have good regulation and protection against surges and drains...

quote:

Originally posted by Tranceilvania Hey do not underestimate the car batteries, they minumum put out a whopping 300A power without the help of an alternator. A good size battery providing that the car runs on idle should last very long hours no problems! A generator would be better but the price range for a good one would be prohibitive. Plus most hi-power inverters have good regulation and protection against surges and drains...

Even a decent battery isnt going to have the capacity of more than about 50AH, so at 300A you could run the system for a grand total of.... 10 minutes, or 10 and a half minutes with the alternator running.

300A may be a reasonable number for CCA, but there is no way an ordinary car battery would put up with that kind of constant abuse

Even at 100A (1200w) the system will only stand up for half an hour, you could probably push that too 2 hours having the alternator running depending on the size of the alternator and the size of the battery, 2 hours isnt much of a party

Agreed, a car battery wouldn't do it for you, even a deep cycle SLA battery would't last the distance.

I would hire a generator from Aggreko if you are looking for something beefer that what you can find at home use level.
There are many places the hire them out, try looking in the yellow pages.

a fellow engineer

how are you exams going? i'm completly fucked for electromagnetics 2moro :S

I am but a poor little first year, probably seems pathetic that I would complain about how hard it is, I assume your in ECSE, which I've heard is that hardest (and my first prefence, why do I keep doing this to myself ), but I'm gonna do it anyways.

I've got one tomorrow (Mechanical) not too worried about that one.
And Monday is Materials, that'll be a walk in the park.

But today I had Systems.. *shudder*
I really hate that subject, should be a pass however.

1902 was a bit of a prick, but that should be fine too.