Joined
·
1,500 Posts
Hi Karl,
I'm not in sacremento, but willing to give your questions a shot.
1) 144v would be the absolute minimum to attempt that sort of speed. 192v would be more likely to get you there. The higher the voltage, the faster the motor can turn, the faster the motor can turn under load, the more efficient it is.
2) 40 miles is an obtainable goal in that car, but I would venture a guess that you won't hit 40 miles at a 75 mph speed, but perhaps at 40 mph. 100Ah isn't going to have enough capacity to haul you at your "at least 75 mph" speed for 40 miles.
3) Hub motors are an interesting concept, but like any direct-drive setup, they will require big amps to get you moving. There are easily obtainable hub motors, but they are not sized adequately for your application. Furthermore, the ones that are available that would work well in an EV that will weigh as much as yours when complete may weigh too much for your suspension, adding significant unsprung weight, which translates into poor ride and handling. It is more effective for most folks (unless they're on an unlimited budget) to utilize an existing gearbox to perform gear reduction to make the job easier on a larger sized motor.
4) If the vehicle was offered with AC to begin with, you may be able to find the parts required to add it to your conversion. Otherwise, an aftermarket unit may be required, which typically is a box with a blower, evaporator, and a few vents which is designed to mount under the dash (typically in a pickup truck or other "large under-dash space" vehicle like a large american classic car). Not saying it's impossible if your car didn't have the option of an AC when it was new, but will certainly take some clever fabrication. There are many ways to handle the compressor, check the wiki for some ideas on that subject.
I don't want to rain on your parade, but I think you may need to refine your speed and/or range goals, given the limited payload capacity of your vehicle, unless you can afford tens of thousands expense in LiFePo4 batteries and associated items like BMS and charger.
Good luck, and hope to see your project progress.
I'm not in sacremento, but willing to give your questions a shot.
1) 144v would be the absolute minimum to attempt that sort of speed. 192v would be more likely to get you there. The higher the voltage, the faster the motor can turn, the faster the motor can turn under load, the more efficient it is.
2) 40 miles is an obtainable goal in that car, but I would venture a guess that you won't hit 40 miles at a 75 mph speed, but perhaps at 40 mph. 100Ah isn't going to have enough capacity to haul you at your "at least 75 mph" speed for 40 miles.
3) Hub motors are an interesting concept, but like any direct-drive setup, they will require big amps to get you moving. There are easily obtainable hub motors, but they are not sized adequately for your application. Furthermore, the ones that are available that would work well in an EV that will weigh as much as yours when complete may weigh too much for your suspension, adding significant unsprung weight, which translates into poor ride and handling. It is more effective for most folks (unless they're on an unlimited budget) to utilize an existing gearbox to perform gear reduction to make the job easier on a larger sized motor.
4) If the vehicle was offered with AC to begin with, you may be able to find the parts required to add it to your conversion. Otherwise, an aftermarket unit may be required, which typically is a box with a blower, evaporator, and a few vents which is designed to mount under the dash (typically in a pickup truck or other "large under-dash space" vehicle like a large american classic car). Not saying it's impossible if your car didn't have the option of an AC when it was new, but will certainly take some clever fabrication. There are many ways to handle the compressor, check the wiki for some ideas on that subject.
I don't want to rain on your parade, but I think you may need to refine your speed and/or range goals, given the limited payload capacity of your vehicle, unless you can afford tens of thousands expense in LiFePo4 batteries and associated items like BMS and charger.
Good luck, and hope to see your project progress.
