# New Electric Car

5090 Views 23 Replies 6 Participants Last post by  EVEngineeer
How much hp do I need to get a top speed of 100 miles. The car will be a vw golf.

I will have a 14400 ah capacity battery.

Can someone please recommend a motor?

What range will I get at 55 to 60 miles an hour?

Also, can someone also give me a list of components I need for my conversion.

Thank you so much!
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Hi Skywalker

14400 ah
That is an odd number!
Are you sure it is not 14400 mAh?

You will also need to tell us about the voltage

Volts x Ah = Watthours - this is the energy - depending on the car it will take 200 - 300 watthours to go one mile

430Kg of lithium batteries will be about 40Kwatthours - 130 miles range
430 Kg of lead acid will get you around the block
I am sure it is 14400 ah.

The voltage for each battery is 3.2 V
very good
now how many batteries do you have?
But I only 144 volts for the motor.

72 batteries X 3.2 volts is 230.4 volts. That is too much!!

What do I do?
72 x 3.2 = 230v

You can have 230v and 200Ah
Single string all cells in series
Or
two strings of 36 x 3.2 = 115v
115v and 400Ah
Two strings of 36 cells in parallel (2 x 200 = 400Ah)

Or you can use a DC motor - (Warp 9/11 or ex forklift) and a Soliton Controller that will use 230v and drop it to a lower voltage for the motor
I really want to use a ac motor.

If I use a controller to lower the voltage, am I wasting charge from the batteries????

I think your two string solution might work for me.
I really want to use a ac motor.
AC is the way of the future BUT at present it is a lot more expensive for the same performance than DC

If I use a controller to lower the voltage, am I wasting charge from the batteries????
No
Controllers are power in = power out devices
At low speed your motor only needs a few volts
Motor - 23v - 1000amps
Battery - 230v - 100amps
23v x 1000amps = 230v x 100amps (the controller does the = step)

I think your two string solution might work for me.

You can use two separate strings but it is normally better to double the cells up and then couple then into a single string
they are the same thing but the second way copes better with cell variability
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