On Tue, Feb 15, 2011 at 10:03 PM, Kerry Wentworth wrote: > Actually, it says "also note that vehicle weights around 1100kg" Not if you look at the site (which is where Isaac was getting his battery spec) - the one with 4 150Ah batteries has claimed weight of 550kg (I was looking at chassis weight before). If I plug 550kg (rather than 470kg) in, then the PE requirement is actually almost 27MJ, hence not quite enough energy in the batteries even assuming perfect conversion. Chris --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .