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#51
05-31-2012, 01:51 PM
 Ziggythewiz Senior Member Join Date: May 2010 Location: Houston Posts: 3,722
Re: Formula ?

Quote:
 Originally Posted by EVEngineeer who knows what car I will get, all I know is that it will be real cheap or free
If you're serious about building a 100 mile car a free donor would be a terrible choice. That's the place I most wish I had spent more. Why would you spenk \$30K and hundreds of hours on something worth nothing?
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1 EV - 8,530 e-miles in 2 years (2/11/13) - http://www.evalbum.com/4000
#52
05-31-2012, 01:55 PM
 ruckus Senior Member Join Date: Apr 2009 Posts: 638
Re: Formula ?

Quote:
 Originally Posted by EVEngineeer I'm sorry but that calculator is to much for me..
How is that possible? They already fill it out for you with an "average" car like the Passat. Look at the watts needed to go 70mph. 15000w. My 3rd grader knows that 15000w = 15kw. If you drive at 70 for an hour you will need 15kwh and go exactly 70 miles. But you want to go 100 miles so you take 15 x 1.3 and get 19.5kwh. Since the battery will weaken with age you need to start out using 70%. 19.5 x 1.3 = 25kwh.

Simple.

If you get a small aerodynamic car and do a few aero modds (ecomodder.com) you can get that down to about 12 x1.3 x1.3 = 20kwh

If you run a 120v system it would be 20000w / 120v = 160ah batteries
If you run a 240v system it would be 20000w / 240v = 83ah batteries

Now since this is just an estimate you should get another 20% just to be safe. So you are in the 24-26kwh range for your pack.

I get a price of about \$10,000 minimum for the pack. But I am terrible at doing math in public and probably made a glaring mistake..

If you read a couple of blogs or build threads they will explain all this for you. If you are 5 years out from building, then read for a bit, there is no need to hurry.
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#53
05-31-2012, 03:14 PM
 EVEngineeer Senior Member Join Date: Apr 2012 Location: Florida Posts: 221
Re: Formula ?

i've been reading all over the place. I will continue to read books about this and more stuff on this forum. I just like to post these questions, because I figure that it would help me understand things quicker and more efficiently if they are direct questions instead of the general ones that I see constantly. I want specific answers.
#54
05-31-2012, 05:19 PM
 TigerNut Senior Member Join Date: Dec 2009 Location: Calgary Posts: 277
Re: Formula ?

Quote:
 Originally Posted by EVEngineeer I want specific answers.
That's nice, but what we're mostly trying to get across here, is that it's up to YOU to take the general information that exists (and that we're giving you), and apply it your specific wants, needs, and budget.

What you're asking for, by way of a kindergarten analogy, is cardboard stars, when you've already got a sheet of cardboard, scissors, and pictures of other stars in front of you. A kindergartener will learn a lot from picking up the scissors and doing some cutting. You will learn a lot from trying to fit the various pieces of Internet EV-car lore into your dream. Just don't run with the scissors
#55
05-31-2012, 05:59 PM
 SandRailEV Member Join Date: May 2012 Posts: 69
Re: Formula ?

Quote:
 Originally Posted by EVEngineeer i've been reading all over the place. I will continue to read books about this and more stuff on this forum. I just like to post these questions, because I figure that it would help me understand things quicker and more efficiently if they are direct questions instead of the general ones that I see constantly. I want specific answers.
Having others give you specific answers won't help you learn a thing. Doing your own math will likely help you to understand the physics needed to design an EV of your own... All I see in most of your posts is "I want" "I want" "I want" "I want" "I want" "I want" "I want" "I want".....

It's time to start doing for yourself...
#56
05-31-2012, 06:03 PM
 ruckus Senior Member Join Date: Apr 2009 Posts: 638
Re: Formula ?

SO THIS THREAD IS CLOSED THEN? All in favor no longer reply... anyone?.... anyone?... GOOD.

You will continue reading and take what we have given you and run a BUNCH of calculations and then open another thread at a later date in which you ask intelligent questions and have a little bit of an idea what you are talking about at least enough to PROPOSE a system for us to critique rather than ask us to do 3rd grade math for you?

Cheers everybody!
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www.northvalleyev.com

Last edited by ruckus; 05-31-2012 at 06:06 PM.
#57
05-31-2012, 08:17 PM
 EVEngineeer Senior Member Join Date: Apr 2012 Location: Florida Posts: 221
Re: Formula ?

Thanks everyone for helping me

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