So based on the 100 amp dis charge results what kind of voltage per cell do you think Joerg was getting during his 120mph run Steve?
Steven
www.OffshoreElectrics.com
Just so you understand, I never started this thread to calculate the current or voltage of Joerg's motor. This is a informational thread for the GP3300 cell (green / yellow) in this case.
Steven
We don't know whether Joerg's motor was drawing anywhere near 100 amps. What we could do is work backward from the known data. We know from audio spectral analysis that his motor was turning in the region of just under 50,000 rpm (loaded) If we know the Kv of his motor then we could estimate what kind of voltage per cell it would take to achieve this rpm. For maximum efficiency and performance his loaded rpm was probably in the region of 75-80% of the motor's unloaded rpm. This would mean that the unloaded rpm would have been in the region of 65K.
If we use y as the cell voltage under load then:
32y times Kv = 65,000
Disclaimer: this is a ballpark calculation![]()
Thats what I was getting at. I didnt mean to change your topic Steve.Just so you understand, I never started this thread to calculate the current or voltage of Joerg's motor. This is a informational thread for the GP3300 cell (green / yellow) in this case.
But you can see that the cells could not keep the boat running fast if it used 100 constant amps. Looks like he was running an average of 60-70 amps
By the way thanks for all the hard work. Is there a way to figure the long term effects of say 60 amps discharge? Without the field testing.
Steve
great stuff
any info on how the cells were after a 100amp discharge?
Steve I think I worked out joergs motor seemed to be runnign about .97v to turn the rpm it did that knocks i guess somewhere near 100 looks about right
Yes, flat tops have arrived. There is no performance difference so far. Only the button top is different.TRUCKPULL said:joergs made a post that his 3300's were some new flat top cells.
LARRY
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