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12v car battery

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Ryan94 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ryan94 Quote  Post ReplyReply Direct Link To This Post Topic: 12v car battery
    Posted: 16 July 2014 at 2:43pm
Hi guys,

I need to sort a battery for a little 12v system we are taking to a festival this weekend and I havnt got time to get one delivered of the Internet. I can't seen to find a sealed lead acid battery for sale in any shops so was wondering if a car battery would be Alrite?
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studio45 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote studio45 Quote  Post ReplyReply Direct Link To This Post Posted: 16 July 2014 at 3:42pm
Yeah it'll work but if it's a flooded type make sure you keep it upright at all times, if you put it on its side for any length of time the acid will dribble out of the vents. The weight/ run-time ratio will not be as good as an SLA but it will power up your gear no problem.
Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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luke_0301 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote luke_0301 Quote  Post ReplyReply Direct Link To This Post Posted: 16 September 2014 at 5:06pm
What run time could be expected running off an 110ah car battery? I'm also looking to run a head unit and a couple of small speakers for a festival this wkend
more bass please
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Saturnus View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Saturnus Quote  Post ReplyReply Direct Link To This Post Posted: 16 September 2014 at 5:26pm
Difficult to say as it depends on the head unit, how much energy is wasted in redundant electronics such as blinking lights and because it will likely be a very inefficient class AB amplifier the current drain will also depend a lot on how loud you play so somewhere between 24 and 40 hours is likely.

For comparison a 110Ah deep cycle battery will run a TA2020 (or similar) amp at maximum volume for at least 9 days, 24/7. The output of a TA2020 amp is identical to the output of a car head unit amp so the efficiency difference is enormous. 


Edited by Saturnus - 16 September 2014 at 5:27pm
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amlu View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amlu Quote  Post ReplyReply Direct Link To This Post Posted: 17 September 2014 at 7:59pm
for sla batteries look in toolstation - http://www.toolstation.com/shop/Electrical/Batteries/Sealed%20Lead%20Acid%20Battery/d190/sd2450/p62033


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luke_0301 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote luke_0301 Quote  Post ReplyReply Direct Link To This Post Posted: 17 September 2014 at 11:18pm
Thanks guys will report back after the weekend to tell how long it lasts!
more bass please
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Blaize110 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Blaize110 Quote  Post ReplyReply Direct Link To This Post Posted: 18 September 2014 at 12:10am
Also beware discharging car batteries completely, they won't tolerate it as much as deep cycle leisure batteries.
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