[brian_]

My plan is to mount the motor through the PTO so there is no centre tunnel and put the motor under the seat ( nice and clean)?

I saw that in the drawing and thought it was an interesting approach. If the space between the frame rails in the middle of the wheelbase wouldn't fit any of the battery anyway, this is a clever way to free up space in the engine bay and transmission tunnel.

 

[brian_]

For 100km range i only need 17kwh battery

For a typical modern EV that would be correct, but when pushing a barn door through the air on off-road tires 17 kWh might not be enough for 100 km.

 

[brian_]

Motor is including brake system if I understand correctly. The mounting bracket for the calliper should be custom made.

The brake rotors are supplied, but calipers are not, so you would need both the brackets and the calipers that mount on them. The listing says "u could use original brake calipers", but calipers must fit the thickness and the diameter of the rotors, and does a Series III Land Rover even have calipers?

 

[brian_]

Questions unaswered:

• Weight baring capacity electric motors..

The listing has reasonably complete motor specs, but no information (beyond the dimensioned drawing) about the mechanical specifications. Hub and bearing load capacities are significant considerations, especially since these hub-motor units are intended for a very light car and the proposed project is heavier and has large tires (which increase bearing loads when the vehicle is cornering).

 

[brian_]

Questions unaswered:

• ...
• ...
• How much power do we need to have a car that can do 80km/h and have a decent acceleration? 20kw? 40kw?

To just maintain 80 km/h the vehicle will need at least 15 kW, but to accelerate to that speed in any reasonable time will need much more.

Another concern is power available at low speed. Power is the product of torque and speed, so less power is needed at lower speed for the rate of acceleration or grade climbing ability; for starting off from a standstill, you only need to consider torque to the wheels at zero motor speed.

A normal EV has gearing with a substantial speed reduction ratio between the motor and the wheels (for example, about 8:1 for a Nissan Leaf and 10:1 or more for a Tesla), and the speed reduction ratio is also the torque multiplication ratio. So the 320 N⋅m motor output of a Nissan Leaf is multiplied by 8 to be about 2500 N⋅m at the wheels. These hub-motors are specified at "about 350N⋅m" peak, so 700 N⋅m for two or 1400 N⋅m for four... and that's only briefly before the motor overheats and the controller must reduce current and torque. These motors look just adequate for a small car, and that's the suggested application, but a Land Rover is unlikely to be acceptable with them.