Batteries Explained

[thatsgonnahurt 10+ year member]

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[thatsgonnahurt 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?

alot of stress? depends. if you're looking to get the most power from your alternator adding a second battery won't help. it will appear as an additional load to the alternator depending on its state of charge. the more its discharged the greater the load.

 

[SyKo13 5,000+ posts]

No nG..............//content.invisioncic.com/y282845/emoticons/eyebrow.gif.fe2c18d8720fe8c7eaed347b21ea05a5.gif

 

[Thnking 10+ year member]

//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...........

The purpose of Peukerts would be to mathematically define the averaged capacity over time.

Who cares if the number is even as high as 20% off, it's still going to give a better capacity than any manufacturer supplied number,

I could take a wild guess and say that a 400watt amp is going to create a 30A average load over (T) time and the resultant capacity is going to be © capacity.

The number is still going to be much closer than any other defined spec.

If I had a clamp and a computer I could simply plot it. I'd be very very close to the actual number. Like I said within a couple percentage.

If you're trying to tell me that it's hard for someone to guess exactly what the actual load is based on music, sure its true I wouldn't imagine anyone could guess an exact number. But who cares, no one needs an exact number if they are going to guess, Like I said, someone should use it for a batter defined capacity than a manufacturer spec.

 

[audiolife 5,000+ posts]

then if it doesn't do that then its no different (and i bet its more than 20% off lol) and with that being said as long as there is a standardization in capacity this isn't needed more is more less is less and it will be proportional IF it is standardized with what you are doing is +/- 20% or more off how is that standardized. im not jumping on you or anything but when there is standards you follow and if you know your stuff you know what the specs mean...

 

[audiolife 5,000+ posts]

The purpose of Peukerts would be to mathematically define the averaged capacity over time. Who cares if the number is even as high as 20% off, it's still going to give a better capacity than any manufacturer supplied number,

I could take a wild guess and say that a 400watt amp is going to create a 30A average load over (T) time and the resultant capacity is going to be © capacity.

The number is still going to be much closer than any other defined spec.

If I had a clamp and a computer I could simply plot it. I'd be very very close to the actual number. Like I said within a couple percentage.

If you're trying to tell me that it's hard for someone to guess exactly what the actual load is based on music, sure its true I wouldn't imagine anyone could guess an exact number. But who cares, no one needs an exact number if they are going to guess, Like I said, someone should use it for a batter defined capacity than a manufacturer spec.

and i bet you could be off by alot because it depends on ALOT of variables + music isnt constant with 2 different songs you could have 70% percent differences..

 

[Thnking 10+ year member]

then if it doesn't do that then its no different (and i bet its more than 20% off lol) and with that being said as long as there is a standardization in capacity this isn't needed more is more less is less and it will be proportional IF it is standardized with what you are doing is +/- 20% or more off how is that standardized. im not jumping on you or anything but when there is standards you follow and if you know your stuff you know what the specs mean...

Specs don't have any meaning with simple numbers when it comes to batteries. An ESR rating for example, is taken at a specific temperature at a specific frequency at a specific discharge rate. Placing that number into the real world, shows it's insignificant to how the ESR of a battery changes as the conditions change. Differently structured batteries have different ESR curves.

When someone is trying to determine how many batteries they need to run a stereo off of a bank of batteries, looking at the AH rating isn't going to be helpful. If someone is serious about this they are going to take a clamp and average the readings over a period. Yes it’s going to vary song to song and volume to volume and time to time, but there is usefulness depending on the situation. Competing with banks for example.

I also never said someone should expect their capacity to be on the money with music, obviously it's going vary. You’re incorrectly applying what I said about using Peukerts formula to a standard with every situation in terms of battery capacity. But if someone is going to select the # of batteries vs. anticipated current draw vs anticipated time, Peukerts formula is a necessity. No spec can identify this better than Peukerts formula.