Quote:
Originally Posted by tinman01
I'm having a hard time wrapping my mind around the time frame they put on batteries. 75 amps for 2 hours how do they get 200 amps for 20 hours? Seems backwards. That seems to be on all the batteries, I just don't get how you can draw higher amps for longer times.
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You're not following the "units" of measure correctly, which is what's confusing you.
A 200 Amp-hour battery (if rated at common 20-hour rate) would only deliver 10 Amps for up to 20 hours. Multiply current in Amps (10) times duration in hours (20) to get AmpXhours, or 200 A-hour.
Amp-hours is a poor attempt to rate energy capacity of batteries (must be careful because it doesn't include voltage rating). I think engineers would prefer to use kW-hours which takes voltage into account (notice that's how electric car batteries are rated).
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