Tell us about yourself!
This is a 200KW speed-controlling inverter. That is about 268HP with the right motor and batteries! For a wheel-chair 2KW/2.68HP would be more than enough and you wouldn't need the "Regenative braking" either so you could happily go for DC motors. There are lots of off-the-shelf solutions for low powered stuff. What makes MPaulHolmes project great is that now there is a feasible solution for converting a car to electric where before it was cost prohibitive.