# New Electric Car

5093 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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That is a lot of ah. I can go 100 mph with my 200 ah pack, but 14000 ah may be a bit too heavy.
I calculate that the batteries will weigh about 430 KG.

Is this too much?
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
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?
There will be 72 batteries in total. Each one is 200 ah and weighs about 5.70kgs.

Also, is this motor good? Will it be enough for a VW golf?

AC 3Xx2-26.26
Dual Shaft
There will be 72 batteries in total. Each one is 200 ah and weighs about 5.70kgs.
The mystery of 14400ah is solved!

I'm guessing you double multiplied your batteries, e.g. 72 x 3.2 = 230V, and then 72 x 200 = 14400Ah. You don't multiply Ah together unless you're connecting them in parallel.
So is the motor good?

Or is the warp 9 or 11 better??

You can find my requirement in my original post.

Also, new question, is a BMS Necessary??
The motor is good. Some will say you don't need a bms, some will say you do. I would say you do. Your pack btw, is 115 volts, 400ah, and 46kwh,
So the AC 3Xx2-26.26 Dual Shaft can get a golf to 100 miles an hour?

Also, at 55-60 miles an hour, how fast will this motor consume all 14400 ah?

What range will I approximately get (If I never stop and the terrain completely smooth.)?

I have hever heard of aj electric car with 14000 ah. Earlier you said that you were going to use 72 200ah cells that were 3.2 volts each. To use a 35x2 double motor with 72 cells, you will be wiring 36 groups of two parallel cells into a string of 36 cells to get 115vdc each group of two cells will be 400 ah. To see how many ah your pack will be, multiply 115 vdc times 400ah. I was once new to building EVs and understand the confusion, so if you need further help with understanding how many ah you will have, let me know and I can further clarify.
72 X 200ah batteries is 14400 ah right?
nahh, it's still 200ah, unless you plan on using the car at 3.2V
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?
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
But more batteries give me a longer range!
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.

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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