----- Original Message ----- From: "Roger Stockton" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, September 25, 2002 10:41 AM Subject: RE: Where to start?
> Jon "Sheer" Pullen wrote: > > > Putting the last battery in helped a lot, > > This is very surprising. You started with a 264V pack, right? So, > adding one additional 12V module only increases your pack voltage by > 4.5% and only decreases your current draw by a similar amount. Clearly, > this could not explain a 25% increase in range before the performance > starts to droop. No, I was at 21 batteries (252V). I also suspect that some of the change is due to a change in my charging regimine - instead of charging the batteries to 13.8 I'm charging them to 14.2, and the constant-voltage phase instead of 15 minutes is now 30. That is per the advice of Elio. I *know* that some of the change is the result of pulling the entire pack and balancing it with itself by paralleling it and charging it. But I don't know.. I should do a better job of keeping track of each individual change so that I can state with the assurance of experiments that 'X factor resulted in Y change'. But I don't. > > as did other modifications made to the car > > Wierder still, considering that your other mods include alignment > changes that increased your Wh/mi consumption from 160-200Wh/mi to > 200-230Wh/mi... despite the slight increase in pack voltage. That is correct. The battery pack is now more willing to give up watt-hours. > So, the car now uses 15-25% more Wh/mi than its original lower voltage > configuration, but goes 25% further before the performance starts to > sag? How is this possible? > > Some of your other mods must be pretty fancy <GRIN>. Not really. The battery pack was very poorly balanced before, and the results of adding more voltage are slightly nonlinear. I'm just reporting the data as I see it. S.
