Chaps
Connecting a battery to a power point
Hi,
I just installed a new sound system and soon to upgrade to a 100amp alternator and have a 1.5f capacitor installed.
When i go on holidays i want to hook my car battery up to the power so that i can set my laptop sound to the car.
I was wondering how to connect the battery to the power so i dont need to leave the car running.
System will include 3 amps, 2 600 RMS subs, 2 x 6*9 and 2x Splits.
What do you recommend?
why not just get a battery charger?
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Donating Member
You could always take a battery charger and have that hooked up...only way you would really be able to do it without draining your battery
um.... unless the stereo draws more than the charger can supply.....
Chaps
oh kk so all i need is a big arse charger
lol
and as long as i dont max it should be alright.
Not a valid input....
right...should only set you back 500-700 bucks
You put you left foot in, your put your right foot in , you take your left foot out and you slide it all about!
Custom Car Stereo Systems
lol....
How much power do the amps make (rms) ?
Could always get one of these;
Jaycar Electronics
Puts out 13.8v at around 40A.
I think you'll have to disconnect the amps' power cables from the battery and connect it to the PSU above, and connect a 8awg earth cable to the negative terminal. Not too sure about that tho.
Saw a few of the cars at Autosalon using these babies to power their systems while on show.
Not a valid input....
chances are that one won't be enough. especially with 3 amps.
You put you left foot in, your put your right foot in , you take your left foot out and you slide it all about!
Chaps
Yeah,
2 amps at 600 RMS (mono sub ones)
1 amp at 600 or so rms
Custom Car Stereo Systems
Do you wanna run the system at full volume?
I would suggest buying one of the PSU and slowly turn the system up, that unit has an amperage display so you should be able to turn it up maybe just under half volume and the amps shouldnt pull more than 40A...it'll mainly pull alot of current on bass notes.
Buy one, see how far you can turn it up before the system starts pulling 35 or so amps, and if that volume isnt enough then you'll need two.
or buy a cheaper stereo and run it from the GPO......
Chaps
Yeah, half is damn loud still.
And it might just b easier to take a power adapter (4 pronga) and my mini 5.1 speakersand laptop power
lol
thanks anyway
Last edited by korn3172; 15-10-2008 at 07:55 PM. Reason: Just added more detail
Custom Car Stereo Systems
Yeah i would probably go with that option
Banned
considering that music has transients, and isn't a constant load on the power supply and battery, a 40 amp PSU will probably be enough.Originally Posted by .
Jaycar Electronics
the one above should do just fine, and its cheaper than the other one posted as it doesn't have all the features.
Chaps
Yeah i guess that would be a option.
But i think the speakers and extension cord will b easier
Not a valid input....
Considering each time his bass hits he will probably pull 80-100Amps... sure, that probably won't pop the fuse in the PSU but considering I don't know him and neither do you..I'm not going to say "She'll be right mate!"
You put you left foot in, your put your right foot in , you take your left foot out and you slide it all about!
Car Audio Installer
Lol. Our Alpine demo board has 2 40 amp regulated power supplies, we took one out and the music cut out running 4 speakers and one sub and mid volume. " She might be right Mate"
maybe just buy another battery, that way you could have one on charge while you use the other to play music with, but ur car will prob drain the battery faster than a charger will charge it
Chaps
LOL
See above what im doing
5.1 ftw
Banned
and considering that he's running the PSU along with a battery, a battery that can give 300+ amps, yes, it will be fine.
and during the periods in the music when the amps are only drawing 10 amps or whatever, the battery will get topped back up.
Not a valid input....
that system will not charge a battery man...it puts out a regulared 13.8 Volts....without a load. that won't charge a battery.
You put you left foot in, your put your right foot in , you take your left foot out and you slide it all about!
Banned
of course it will charge a battery most cars charge their batteries at between 13.8 and 14.2 volts.
a 13.8 volt regulated PSU will quite happily charge a battery.
Custom Car Stereo Systems
Its irrelevant anyways cos he's going with the 5.1 speakers off the laptop.
But....
As the PSU dosent have a regulator (like an alternator) you run the risk of overcharging the battery.
Banned
no you don't.
its a regulated 13.8 volt powersupply, which is perfect for charging a battery.
if anything, the cars alternator is a lot worse because it isn't regulated, the voltage from an alternator will fluctuate with load, and engine rpm.
Not a valid input....
a cars alternator is heavily regulated...at over 14 volts. The amount of current that can be supplied for charging purposes is what varies.
Yes, voltage is a little lower at idle..but not less then half a volt.
13.8V with a maximum current draw of 40A is not going to sustain a battery AND a car stereo.
You put you left foot in, your put your right foot in , you take your left foot out and you slide it all about!
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