Batteries Explained

[acold7dusta 10+ year member]

learned some things from that, sticky?

 

[SyKo13 5,000+ posts]

A couple of corrections:
10% isn’t a very realistic typical percentage when comparing discharge rates C/100 and C/20 or C/8. That number can vary from a small percentage to over 50%.

Peukerts formula can’t be used in that form, because it wasn’t devised to find relationships between varying discharge rates using a specific battery capacity. It’s a pretty common mistake with textbooks.

How it’s written for specific battery capacity is:

[T/(R*C)]*[i/(C/R)]^n=C

Where R equals the battery amp hour rating ( ie, 20 or 8 or etc)

Well, I had trouble learning that formula and still have trouble understanding it, it pissed me off and I kinda left it alone for a while, and yea the book has its flaws but not every textbook is perfect ya know //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[.::DuD3::. 10+ year member]

learned some things from that, sticky?

x2, i say sticky this. great write up. //content.invisioncic.com/y282845/emoticons/woot.gif.aaa6090e619a97b6090d16dd863c5a69.gif

 

[audiolife 5,000+ posts]

Peukerts formula cant even be used as part of figuring out how long a battery will last in a system. there is NOTHING constant powerwise in a car audio system unless you plan on listening to 15 minute test tones lol

 

[Thnking 10+ year member]

Repeated reply

 

[Thnking 10+ year member]

Nothing needs to be constant.. Specd capacity of a battery with a linear or non-linear discharge is a integration of an average energy vs time.

And for the record no one said the resultant is dead on the money, but by using Peukert's formula it will be within a couple %. It's the absolute best way to mathematically determine the relationships of the battery with varying discharge rates.

 

[audiolife 5,000+ posts]

will be alot more than a few % off when your figuring out the rate that energy is being pulled to by music. your current will vary from 2 amps to 110 amps (between songs there will be a huge difference in power consumption with SAME volume setting). that equation is more for trolley motors and RV refrigerators

 

[Thnking 10+ year member]

will be alot more than a few % off when your figuring out the rate that energy is being pulled to by music. your current will vary from 2 amps to 110 amps (between songs there will be a huge difference in power consumption with SAME volume setting). that equation is more for trolley motors and RV refrigerators

Not very good at reading what I type are you:eyebrow:

Nothing needs to be constant.. Specd capacity of a battery with a linear or non-linear discharge is a integration of an average energy vs time.

Enough said.

It is only going to be a few percentage off at most, with a decent guess at average current. If someone really is clueless they can take a wild guess and bump load up 50% and they'll still be much closer to capacity than the spec'd AH rating.

The AH rating would be used for something like refrigerators in a RV. You're definitely a confused individual.

 

[Jared530 10+ year member]

so if i were to get a second batt, would that put alot of stress on my alty? or would it matter? Would it be a better idea to not put a second batt if i only had a 90A alty?

 

[audiolife 5,000+ posts]

Not very good at reading what I type are you:eyebrow:
Nothing needs to be constant.. Specd capacity of a battery with a linear or non-linear discharge is a integration of an average energy vs time.

Enough said.

It is only going to be a few percentage off at most, with a decent guess at average current. If someone really is clueless they can take a wild guess and bump load up 50% and they'll still be much closer to capacity than the spec'd AH rating.

The AH rating would be used for something like refrigerators in a RV. You're definitely a confused individual.

//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif :laugh: //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif :laugh: //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif :laugh: //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif :laugh: ok what is the average current of a 400 watt amp playing full range to the Ghostbusters soundtrack at 69.2% full volume...........

 

[CBFryman2 5,000+ posts]

Ummm, voltage isnt deadly //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

 

[audiolife 5,000+ posts]

voltage isnt deadly? to an amp?

 

[Jared530 10+ year member]

someone help me out plz...

 

[ngsm13 5,000+ posts]

So, you copied sections directly from your book... and typed them out.

Cool.

nG

 

[CBFryman2 5,000+ posts]

voltage isnt deadly? to an amp?

The part about the higher the voltage the more dangerous to your heath is a massive ****ing lie. Static electricity builds to thousands of volts but cant carry enough current to do more than give a little pop. On the other hand, people have defribulated people's hearts using 2-3 car batteries in series.

Current is deadly, not voltage.