The BMS only controls the LVC and OCP during discharge. If we bypass the BMS we run into the problem of longevity. Bypassing the BMS and using the Cycle Analyst gives US control over the DOD and current output and hurts longevity if we increase DOD and over current. But, I'm not sure we want control over them? Homostupidous? The built in Dewalt BMS protects the pack from us. We can only increase the amount of packs we use to a 2s setup? Not much better. Like this?
At 36V/2.4Ah each, this setup would be 72V/4.8Ah? And if 2s is the most they can handle and I need 36V, 2s2p is the best I can do with unaltered Dewalts?
How much voltage the BMS can take is dependent on what FETs are used to provide LVC. The higher voltage the FETs are rated for, the higher voltage system can be used.
This and 2s max may be why several people are taking apart Dewalts for the cells. They are eliminating the 15A fuse too.
No, that's a disaster. Eliminate all the grey wires and then you have a 4s string.
Damn it. I keep doing that. Sorry, I was tired :(
You got the parallel right, though.
I finally did something right :)
Easiest way to keep the packs from trying to supply more than 15A is to use enough so that the controller ends up limiting the C-rate to 7 or less (e.g. you'd need about 60Ah worth of packs on your 400A controller).
LOL 60Ah with Dewalts? How? 25 packs in series? 2.4Ah x 25 = 60Ah. That would be sweet, a 36V/60Ah Dewalt A123 25s1p pack :)
Regarding LiFePO4 PHEV and BEV...
Okay in lameman terms, dont we need the BMS to limit usage of the batteries to only the middle 50% to get 100,000 miles out of the batteries. So to get the longevity necessary and to make it useful in a PHEV or BEV can we simply increase the size of the bank and the Ah of the LiFePO4 pack?
30kWh is what the average car would need for 100-150mi range).
Why medium sized? You planning on having lots of kids soon? What Year? Make? Model? Give me your 1st and 2nd choice.
Have you seen the new Ka-dill-e-ak Escalade hybrid? A whopping 12 MPG in the city! Whoohoo! The rich are trying to be environmentally conscience at least. *cough* No wonder GM is bankrupt!
Is combining different voltages okay? Like combining a 24V pack with a 36V pack in series, totalling 60V. Or is this another disaster?
Combining different AH levels may/will hurt the lower Ah pack?
Regarding Kelly controllers...
My present controller is 24V-36V/400A. I can theoretically run 100s of Ah's through it, right? Can I theoretically run a 1000A to it without hurting it? Will it simply cut out or only allow 400A max or will it be a little melted hunk of metal fused to the road. If I hook up a 48V pack to my controller, will the controller OVP kick in and shut down, or will it only allow 36V to flow somehow?
LiFe is just getting started.
Your life is :)
If they can make more money on something else, they will kill LiFers.
Prices HAVE been slowly coming down as more competition comes on the market.
Seems like it. I found 48V/20Ah pinglike Lifers for $88. Dont ask me how many you have to buy though :)
LiCo too dangerous? LOL You are assuming that big business and our government cares. Ever heard of a Corvair, Pinto, gas tanks on the outside of the frame rails on Chebby trucks, firestone, single hull Exxon Valdez, DCB, alcohol, cigarettes, prescription medicines, over-the-counter medicines, DDT, insecticides, red dye #5, flouride, preservatives, global warming, tap water, HMOs, war, etc. etc. etc.....
Yes, the chance of something going wrong is slim,
Thats why they do an Actuarial Analysis... Share holder profits versus Lawsuit judgments and settlements...
There will just be a melted hunk of metal fused to the road.
LiCo Police BEV half way into a hot pursuit car chase. :)
$10/gal would be peanuts overall.
Life will be like Mad Max when that happens. WWIII is almost here. Why do you think we are in Iraq? 911? Nope, that was the excuse they needed. At least their will be lots of LiFers to power the guidance systems on the nukes. When its over we will have access to cheap LiFers, but they may have a little dried blood on them.
you can already build a BEV with 300mi+ range if you've got the money.
Not me yet, but thats that the plan someday. Right after my pyramid :)
I still think I don't have near enough power to win.
Good! I want to win the drag race. You win the 50 mile marathon... for now :)