NAC battery question

[Grant Lenahan]

Let's say 1W average output and 50% efficiency.  1W@ 8 ohms is about 
0.33A (i^2r=P).
So 0.33A for a 700A-H battery sounds like 2100 hours x 50% = 1050 hours.

Or, as we say technically, a long &%$#ing time.

Grant
On Dec 13, 2006, at 1:48 PM, Huw Powell wrote:

>
>>> ive got a quick battery question - if i were to use my car battery
>>>  to power a home reciever and speakers for a tailgate event how
>>> would i do that and how long could i expect it to play with say a
>>> 60 w.p.c. reciever? how would that work, would i need some kind of
>>> converter?
>>
>> I'd say that you'd do better hooking up a portable CD player to a
>> cheap-o car amp and some home speakers or an auto "wedge" speaker.
>
>> With a portable CD player (discman, etc), a car amp, and a reasonably
>> efficient speaker I'd expect you to get a few hours out of a car
>> battery.  Though, that kind of use is hard on car batteries.
>
> I generally agree.  You ought to get several hours at least out of a
> good well charged battery, though.  It will play until it is long past
> being able to start a car.
>
> How about an mp3 player instead of a cd player?  This is the 21st
> century, after all, as they tell me.
>
> Also, if you are obtaining speakers to do this, consider that the more
> efficient they are, the longer the system will play at a given volume
> level.  Music supply stores often have rental PA gear, those speakers
> tend to play very loud for given power input.  "Audiophile" level sound
> quality may not be there, but this doesn't sound like it's going to
> really matter, all you want is tunes.
>
> -- 
> Huw Powell
>
> http://www.humanspeakers.com/audi
>
> http://www.humanthoughts.org/
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