Re: [EVDL] Lithium Ion Battery Upgrade Cost for Solectria Force
[quote] Larry Fisher wrote:
> I am buying a 1997 Solectria Force that needs batteries. I keep hearing that
> lithium batteries are a good long term investment but capital intensive up
> front. How much would it cost to convert to lithium and extend effective
> range to 60 miles? What would be a good configuration, lots of 40ah or
> fewer 60ah or...?
> (I am hoping to move to a 144v system if it is practical in order to
> facilitate a better relationship with PV grid tie solar system at 48v)
For 144v, I would say that 100ah is the smallest cell you should
consider. The cheap cells (TS, CALB, etc) should not be depended on to
supply more than about 2C for any length of time. That means 200 amps
for 100ah cells. Keep in mind that they will run less than 1/2 hour
for 2C continuous discharge. 40ah, 60ah are just too small. Several
people are using 100ah but I think many of them think 100ah is too
small. I think you should consider 160ah, 200ah or even 260ah. Of
course you can parallel 2 or more 20ah, 40ah, 60ah cells to get more
capacity; that may be appropriate where you need to stuff them in
Also, consider that large cells with relative modest discharge rates
are supposed to lead to better longevity.
I am approaching 30K miles on a 260ah pack. Will post some detail in a
month or so when I reach 30K miles. I figure I've already gotten 2 or
3 lead packs out of it and have FAR greater range than I could hope
to get with lead. My pack will run about 3 hours at around 50mph at
about 1/4C. ROUGH averages. I rarely pull more than 400 amps.
Willie, ONWARD! Through the fog!
http://counter.li.org Linux registered user #228836 since 1995
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