Portable Power supply for 2ch amp - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 23rd July 2008, 08:07 PM   #1
diyAudio Member
Join Date: Jul 2008
Default Portable Power supply for 2ch amp

Hello Everyone,

Just a warning. I am ridiculously new at this, so please don't flame me.

I currently have a small 2 channel Amp that I would like to use portably. (Scythe "KAMA BAY AMP" 2ch Amplifier) . The AC adapter has an output of 12v 3000mA

I also have a couple of Portalac pxl12090 12v 9ah batteries. (but rather only use one at a time)

So my question before blowing everything up, what would be your first steps in making it work. Should I use different batteries? I would like the "stereo" to last for a few hours. Or am I just totally out of wack and do not understand at all, and this can't be done.

  Reply With Quote
Old 26th July 2008, 04:15 AM   #2
diyAudio Member
Join Date: Apr 2003
Location: Portland,Oregon
Blog Entries: 4
Send a message via AIM to DigitalJunkie
Those batteries should work fine.

Assuming no losses,100% battery efficiency,etc... (not real-world!) with 3A of draw,your 9AH batteries would last 3 Hours.

Now,Battery capacity isn't a linear curve...And generally for long-life,you don't want to discharge a lead-acid type battery more than 50% (you can go a bit 'deeper',but 50% is a nice round number)
So,that would drop the usable time to roughly 1.5hours.

That is assuming a *constant* 3A load,which I doubt the amplifier will present,unless you are playing sine waves at full volume. The average draw will likely be much less than 3Amps.

I'd guesstimate that one of your 9AH batteries would run your amp for 3hours,or more before needing to be recharged,depending on volume level,etc.

If that's not long enough,parallel the other battery on there,and double the run-time.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
How can I power my amp (200w) to make it portable (away from the car) samsunnyuk Power Supplies 5 13th July 2006 07:07 PM
Wanted: External, portable CD-ROM or DVD drive; decent USB DAC, portable speakers. Spasticteapot Swap Meet 0 31st May 2006 02:13 AM
Portable Class D Power! Choices? Andres83 Class D 16 28th November 2005 05:32 AM
What about a forum dedicated to portable/low power? Bricolo Everything Else 12 10th November 2003 12:52 AM
heater supply (xformer specs are 6.3V 2.5A) as supply for a power LED? jarthel Tubes / Valves 10 21st July 2003 01:30 PM

New To Site? Need Help?

All times are GMT. The time now is 09:11 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2