Go to optima's site, and look at the "Amp Hours" rating for the battery. Take the number of amp-hours, and either divide or multiply depending on the number of amps you're drawing. I think the rating on a yellowtop might be 55 Amp-Hours, but I'm not positive.
All you have to divide is the number of amps you're drawing by the number of amp-hours the battery can supply.
Example:
110 Amps for 30 minutes (110 Amps / 55 Ah = .5 Hours)
50 Amps for 54.5 minutes (50 Amps / 55 Ah = .909 Hours)
If the number is something really strange, for example, .909, just multiply it by 60 to find the number of minutes you can last.
All you have to divide is the number of amps you're drawing by the number of amp-hours the battery can supply.
Example:
110 Amps for 30 minutes (110 Amps / 55 Ah = .5 Hours)
50 Amps for 54.5 minutes (50 Amps / 55 Ah = .909 Hours)
If the number is something really strange, for example, .909, just multiply it by 60 to find the number of minutes you can last.
- Thread Starter
- #3
man, I do not need minutes, I need seconds....... 30 to be exact
Look at cranking amps, then.
That's the max current flow from the batt.
The yellowtops are usually lower than the red tops, but ignition-off useage makes redtops cry.
That's the max current flow from the batt.
The yellowtops are usually lower than the red tops, but ignition-off useage makes redtops cry.
jujumantb
10+ year member
Duke of Earl
thats rated for 7volts though, I dont know of any amps than can run off 7 volts.
- Thread Starter
- #6
i will have ignition on,,, db drags bassrace is a 30 second average.....
SUB_URBAN
10+ year member
Almost ******
get an alt!
- Thread Starter
- #8
got one, 280 iraggi, i just need to be able to run 450 amps for 30 seconds, with 2 yellowtops and the current alt do it?
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