EV Math: Electric Porsche 914 Range

by Kimura Kellen
(Salt Lake City, UT, USA)



I have just been doing a little bit of math, and I am missing something.

I was viewing a manufacturers website that does conversions for Porsche 914s, and it said, "Heavy cars use 288 Wh per mile" and then later on it said, "Use about 16-24 6v batteries." for your conversion. Now, the typical range I see on the converted 914s is 40-50 miles, but a 24 cell pack (6v * 240 Ah * 24cells/288 Wh) equals 118 miles. Where is all that range going? Why doesn't it add up?

Hi, Kimura -
Well, I can't speak for the website you visited, but I'm wondering if they weren't considering the Porsche 914 a heavy car, maybe.

Here's what I'm looking at: 6 volt batteries are almost always used in DC systems. The voltage range you described (96-144) would not move a heavy car much at all; the 96 volt DC system might power a fair VW bug or Geo Metro, and the 144v system might work pretty nicely for your Porsche.

As for the math, I suspect the 288 wh applies to something bigger than the 96-144v systems.

Regards,
Lynne

Comments for EV Math: Electric Porsche 914 Range

Average Rating starstarstarstarstar

Click here to add your own comments

Rating
starstarstarstarstar
Weight
by: Ken

How much does ur car weigh?

Rating
starstarstarstarstar
RE: Electric Porsche 914 Range
by: RayRay

Hi Kimura,
The 118 miles represents 100% of the pack. With lead acid you only want to discharge about 30% to 40% of the total pack, so that you can make them last for a few years.. So, if you take 40% of the 118 - that puts right at the 40 to 50 miles...
-ray

Click here to add your own comments

Join in and write your own page! It's easy to do. How? Simply click here to return to Conversion questions.

Share this page:
Enjoy this page? Please pay it forward. Here's how...

Would you prefer to share this page with others by linking to it?

  1. Click on the HTML link code below.
  2. Copy and paste it, adding a note of your own, into your blog, a Web page, forums, a blog comment, your Facebook account, or anywhere that someone would find this page valuable.