Quote:
Originally Posted by Yabert
The Headway are rated 909w/Kg (10 Ah) or 1500w/Kg (8 Ah).... so the max power you can produce with 65 lbs of cells will be : 65 / 2.2 = 29.5 x 1.5 = 44 Kw
But 44 Kw is 310 lbspi of torque at 1000 rpm or 62 lbspo of torque at 5000 rpm.
To Jr, the D&D is a great motor, so start with 5 or 6 lead batteries and later if you decide to go with lithium your motor will be good enough...

I'm not all that good with math, and those of you out there that know this stuff better then me please point out where I'm wrong
The 38120P battery is rated at 8 ah and 25C for at least 30 seconds. That equals 200 amps. I'm hoping that voltage drop at 25 C in a 50S/3P battery will not exceed 2.75 to 2.5 volts per cell. (Still waiting for the batteries to arrive so I can test this volts per cell premise)
So here is what I came up with
2.5 VPC under 200 amp load times 50 batteries per series string equals 125 volts.
3 parallel strings at 200 amps per string equals 600 amps total.
600 amps times 125 volts equals 75 kW battery output for about 30 seconds.
75 kW equals approx 100 horse power.
150 batteries at 300 grams per cell (
I goofed here) is 45 kg equals 99 pounds.
At approx 100 lbs of battery your math and mine are not too far apart.
Would you please post the formula that you are using to convert kW into torque. It would be a big help.
I also went back and edied my original post.
Thanks,
Jim