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Old 15th March 2012, 10:15 AM   #1
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Default Will This battery work?

Hey everyone... my first post here but not my first visit.

I have a small project that I am undertaking. I want to build a portable sound system. I know which amp I will be getting. it is the sure electronics 2 x100watt tk2050

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I am now looking for a battery to power this. and i was thinking about going with lipo and using a sensor to tel me when its running low. Would this one work? It is 22.2v and 5000mAh.

Turnigy 5000mAh 6S 22.2v 25C 35C Lipo TREX 550 600 700 UK Seller | eBay

Any help from you would be greatly appreciated.

Thanks

Will
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Old 15th March 2012, 12:33 PM   #2
agdr is offline agdr  United States
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The LiPo cell would work, but at only 5Ah capacity would last about 30 minutes at the full 200 watts. At 50W total you would get a couple of hours, etc.

If you need to run it for many hours near full power you would be better off with car or motorcylce batteries. Here in the US the car batteries are 12Vdc, so two of them in series for 24Vdc. A pair of 200Ah batteries would run for 24 hours at full power.

Last edited by agdr; 15th March 2012 at 12:43 PM.
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Old 15th March 2012, 07:28 PM   #3
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thanks for reply.

Wouldnt car batteries be way too heave though? as This is a portable system much like a boombox/ghetto blaster. plus the batteries are pritty huge aswel?

thanks again
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Old 15th March 2012, 07:47 PM   #4
RJM1 is offline RJM1  United States
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Or airplane batteries rated 24V vs 12V for a car and charging volts at 28V
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Old 15th March 2012, 11:20 PM   #5
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OK so im a bit confused. LIPO batteries are no good as they will only stay charged for 30mins but a car or motorcycle battery would last longer but are really big and really heavy. is there no happy medium?
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Old 15th March 2012, 11:40 PM   #6
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Also i was thinking... could i use the old school D batteries and also have a mains power so that the batteries are only used when away from mains? If this is a good idea how many D batteries would i need? and is it relatively to make it so that mains has priority over batteries?
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Old 15th March 2012, 11:49 PM   #7
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How about using D batteries? So I would have a load D batteries for when the thing is portable and when its in the house use mains instead? How many D batterys would i need? to get around 22v? (i dont really know how you calculate it...do you just do volts x amount of batteries? )

also is it easy enough to have both batteries and mains...where mains takes over when pluggd in
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Old 25th March 2012, 06:08 PM   #8
norture is offline norture  Indonesia
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My advice is to just go on with the LiPo. It's the best option regarding power/weight ratio. Nevertheless you'd need a specially designed LiPo battery charger as well because you can't use ordinary battery charger.

And don't use those bulky one-time-use D batteries. Their days are gone and let them rest in peace now
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Old 25th March 2012, 06:15 PM   #9
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A 200 W amplifier playing loud music will average under 40 watts. So a 22 V 5 AH when new will run for over 2 1/2 hours.
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Old 25th March 2012, 06:54 PM   #10
sreten is offline sreten  United Kingdom
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Hi,

Take a look at the Podzuma :

Parts Express DIY Project

I'd substritute this is place of the Dayton PA driver, tuned a little lower, say 60Hz.
Aurasound NS525-255-8A 5.25" Paper Cone 8 Ohm: Madisound Speaker Store
(The dayton driver is out of stock, the aura is a better driver IMO)

The presumably quite high bass roll-off of the little t-amp will help
with preventing low bass overload, and you can't reproduce ]
low bass outdoors anyway.

You don't need 100+100W for a small portable boombox.

rgds, sreten.
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When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 25th March 2012 at 07:13 PM.
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