Battery weight loss :)
#2
Today I got
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Sounds awesome, please keep us updated. Now my mind is spinning with ideas to make one of these
#3
Three Wheelin'
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It can be done much neater: four A123 LiFePo4 cells (prismatic, 5mm thick and ~120x200 mm) packed into sawn-off battery casing.
20Ah and can easily crank Jaguar 4.0 Supercharged V8 in winter (tested). 20Ah in LiFe cells is the same as 60Ah in lead acid battery because you can use only 30% or the capacity of the lead acid battery, otherwise you ruin it.
20Ah and can easily crank Jaguar 4.0 Supercharged V8 in winter (tested). 20Ah in LiFe cells is the same as 60Ah in lead acid battery because you can use only 30% or the capacity of the lead acid battery, otherwise you ruin it.
![](http://www.porsche-foorum.org/album/albums/userpics/10026/kerge_aku_1.jpg)
#7
Burning Brakes
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Hmmm, 100 USD for the batteries : http://www.ebay.com/itm/Recommend-4x...2594b0&vxp=mtr
And a controller that costs a few bucks.
A ruined lead acid battery and one to two hours of assembly![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Maybe this controller can be used ? : http://www.ebay.com/itm/BMS-LiFe-4-S...item4acee5bdd1
And a controller that costs a few bucks.
A ruined lead acid battery and one to two hours of assembly
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Maybe this controller can be used ? : http://www.ebay.com/itm/BMS-LiFe-4-S...item4acee5bdd1
Last edited by Akerlie; 04-21-2014 at 10:14 PM.
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#8
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Apparently Lifepo4 and super capacitors are different in that lifepo4 are still batteries whereas super capacitors are rated in farad. super capacitors are 95% efficient whereas lifepo4 are only 90% efficient (still very impressive considering traditional batteries are only 60% efficient at max)
I like the hacked up battery casing, but I will be going with super capacitors on the inside
I like the hacked up battery casing, but I will be going with super capacitors on the inside
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
#9
Advanced
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I'm not sure about supercaps, but LiFePO4 batteries can also get a bit dodgy if subjected to high voltages. They're getting popular in motorbike custom builds since they're so much smaller and lighter, but special care has to be taken to make sure the voltage regulator is operating normally. They are much more sensitive to overvoltage, and even around 15V have been known to smoke. Here's a thread of a guy who's bike looked like it almost caught fire as a result of a bad regulator + LiFePO4 battery
http://www.superhawkforum.com/forums...ic-fail-24934/
http://www.superhawkforum.com/forums...ic-fail-24934/
#10
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2 lithium car batteries and done.
damn sweet setup !
It can be done much neater: four A123 LiFePo4 cells (prismatic, 5mm thick and ~120x200 mm) packed into sawn-off battery casing.
20Ah and can easily crank Jaguar 4.0 Supercharged V8 in winter (tested). 20Ah in LiFe cells is the same as 60Ah in lead acid battery because you can use only 30% or the capacity of the lead acid battery, otherwise you ruin it.
![](http://www.porsche-foorum.org/album/albums/userpics/10026/kerge_aku_1.jpg)
20Ah and can easily crank Jaguar 4.0 Supercharged V8 in winter (tested). 20Ah in LiFe cells is the same as 60Ah in lead acid battery because you can use only 30% or the capacity of the lead acid battery, otherwise you ruin it.
![](http://www.porsche-foorum.org/album/albums/userpics/10026/kerge_aku_1.jpg)
![thumbup](https://rennlist.com/forums/graemlins/thumbup.gif)