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Old 01-30-2009, 04:17 PM   #1
SAcharlie
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Default Voltage sag ???

Believe sag to take place under high amps or as DOD increases.
But is there sag when throttle is set for a lower voltage under high amps? As 48v from a 72v pack or 36v from a 48v pack.
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Old 02-03-2009, 09:47 PM   #2
Nate
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Default Re: Voltage sag ???

Pack voltage does not matter to the individual battery since current is the same in a series circuit. A battery in a 36V pack pushing 500 amps will drop to the same voltage as it would in a 72-volt pack at 500 amps. The difference is in the output; higher voltage equals higher wattages at same amps.
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Old 02-04-2009, 08:50 PM   #3
SAcharlie
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Default Re: Voltage sag ???

Quote:
Originally Posted by Nate View Post
Pack voltage... A battery in a 36V pack pushing 500 amps will drop to the same voltage as it would in a 72-volt pack at 500 amps. The difference is in the output; higher voltage equals higher wattages at same amps.
To clarify my question I'm talking about pulling 36v out of a 72v pack or 50% duty cycle.
When you are only pulling 36v out of a 72v pack I believe the controller is still pulling 72v but only at 50% duty cycle. So if the voltage sags when at 100% duty cycle(72v@500amp x100% =36000watts) does it still sag at 50% duty cycle(72v@500amps x50% =18000watts.
I guess it would sag but not as much.
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Old 02-04-2009, 10:06 PM   #4
Nate
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Default Re: Voltage sag ???

Charlie, you pretty much answered your own question; you pull half the watts your pack won't sag as much.

72V at 50% would average 250A if 100% equaled 500A.
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