I can't help you with this too much yet...as I havn't received my Li yet. I do recall reading some posts about this though...do some searching and perhaps you will find it.Just curious what changes you noticed in your conversion for those of you who have made the jump to lithium. My 91 S10 truck averages about 480wh/mile now. The current weight is 4147 lbs. 1500lbs of that is battery.
I figured if I switched to one string of 130ah 3.4V Calb batteries I would lose about 1100lbs of batteries, cable and steel rack. That's 25% of the current truck weight!
My lead pack is 33.4kw. The new pack would be 19.9kw after bumping to 153V from 144. The higher voltage should also lower my required amps for a given speed/load thus lowering the peukert losses somewhat further extending max range.
So I'm really excited about the new wh/mile and range possiblilties with the switch. Any real world experiences you folks can share with us lead heads???
Couple of comments though... I would recommend going with 180Ah cells minimum on your truck. Your pack will last much longer and you won't worry about stressing it. This is the smallest I would recommend for a small pick up truck.
Nominal voltage is generally accepted as being 3.2 on this chemistry..not 3.4 I think. You really should calculate your pack and nominal on this number as this is where the majority of the discharge will be at (for low current draw). Based on your number of 153 and 3.4 I assume you are considering 45 cells. This would give you a nominal pack voltage of 144, not 153 and about 18.7 KWh.
Peukerts plays very little role in LiFePo... but it's true that your current will go down with higher voltage... not sure that it will in this case though.
Good luck! I'm excited to go Li also! 65 Calb 180Ah cells coming...
Edit... Rickard talks about a rule of thumb using .11 x vehicle weight for calculating efficiency in WH/mile. Assuming your truck is 4000lbs with lead, that's 440 wh/mile. If you dropped 1000 lbs and had a weight of 3000, your efficiency should go to around 330 wh/mile. This may not be exact...but an indicator for you. Charge efficiency of Li is better also which helps....