How many Amp can delivred our controler?
The controller is still under developement. My partner (an EE) in this madness, has bought a bunch of 600 volt 400 amp IGBTs and is slowly collecting the necessary stuff to do an at least 1000 amp 300+ volt controller using the Paul and Sabrina board.
Otherwise I keep looking at the other high end big voltage big current controllers. We will see how he does.
I use Headway 38120S 10Ah on my suzuki DRZ coupled at a 700A controller. In my 26S 3P configuration the voltage drop at 2.3v per cell at 600A (20C) in the first second (1-2 sec.) of acceleration. After my small motor isn't capable to pull higher Amps.
If you use 1000A controller the 2P configuration will be not enought!!!
Depending of your gear ratio you probably need more Amps (torque) and less voltage (speed).
So, for a bit more money, a configuration 30S 4P could give to your 13" motor a good power for 15s. But you will be over the battery spec!!
Use headway at 30C discharge probably reduce a lot his life....
But it's probably a good test for not to much money....
I have decided, after all of the advise I have recieved, to purchase 155 38120P 8 ah cells for their high C rating with decent capacity.
We will use them in either a 50S 3P or a 36S 4P configuration. with the extras as spares. We need fairly high rpm from the motor to keep the wheels spinning but still need grunt when the weight transfer box starts loading the pan, with the 36S and 4P configuration we are looking at 800 amps at 90 volts. Assuming the cells maintain at least 2.5 volts when under max C. we may change to a 50S 3P pack if we don't have enough wheel speed or need al of the power at the end of the pull.
The actual power curve should look something like 110 to 115 volts with maybe 300 amps for the first few seconds (5 to 7) then slowly rising to peak at at as much as 800 amps at 90 volts for the last 2 or 3 seconds. Total time span 13 to 18 seconds. eventually we want to get to a 50S 4P pack. Total gearing could vary from about 4 to 1 up to 20 to 1 depending on the sprocket selection.
There are so many variables it may take years to get it right. With tractor pulling you generally get one try to get it right. All of the tuning is done in your head. No practice or tuning runs. Thats part of what makes it fun
So you have pretty much confirmed that I am on the right track. THANKS
Also want to tell you how very impressed I am with the quality of craftmanship on your bike. With a little tweeking and optimizing of the overall bike design as a true electric I believe it would compare favorably with any comercial product out there.