Car Battery capacity

[Grant Lenahan]

Probably true - I did make that unsubstantiated leap.

That said, I have placed a heavy (amplifier) draw on car batteries for  
quite some time.

We're talking multi-hundred watt class-A jobs.  Thee things will run  
quite a while.

Grant
On Dec 14, 2006, at 7:30 AM, William Magliocco wrote:

> I haven't read the whole thread, but I think I see a
> problem:
>
> "So 0.33A for a 700A-H battery sounds like 2100 hours
> x 50% = 1050 hours."
>
> Someone has mistaken the "700" figure for amp-hours.
> The "700" is probably Cranking Amps (CA) or Cold
> Cranking Amps (CCA).  Just looked at a bunch of
> batteries at a Sears yesterday and that is a pretty
> typical figure for CA/CCA performance.
>
> They are NOT the same as Amp-Hours.  Based on past
> surveys, figure your car battery to be somewhere
> around 50~75 Amp Hours.  That is at least 90% less
> than the CA/CCA figures.
>
> When shopping for batteries, CCA is always lower than
> CA, as CCA is measured at 0 degrees C, IIRC, and CA is
> measured at 20 Deg. C or better.
>
> Car batteries are seldom specified with their AH
> capacity, as their job is to start your car.  Deep
> cycle marine batteries are more likely to be spec'd in
> AH due their application.  Also, there are differences
> in how deep cycle and car batteries are made owing to
> the differences in how they are used.
>
> Sorry to bore the gallery...
>
> Bill M., BSEE & a bunch of TV Engineering & IT certs
> Atlanta.
>
>
>
>
> _______________________________________________________________________ 
> _____________
> Do you Yahoo!?
> Everyone is raving about the all-new Yahoo! Mail beta.
> http://new.mail.yahoo.com
> _______________________________________________
> quattro mailing list
> quattro at audifans.com
> http://www.audifans.com/mailman/listinfo/quattro
> ---
> Watch this space for ads :)