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Friday, 21 October 2011

Oh SH...T


After last night's electric vehicle club meeting I found a member who's converted a Lotus Elise to electric. He had laid down 25 of his 40+ Lithium batteries, to find out 12 of the 25, in the laid down position failed after a short time - nearly 50%. It appears the electrolyte can't come in contact with all the plates in the battery.  So I have nearly finished my battery frame, which has all 16 batteries laying down. So out with the grinder and chop! chop! chop! 







So the "dummy" packs for the batteries are no good, I'll just use a measuring tape





Again I can use the original engine mountings for the battery pack


There! That will have them all standing up like little soldiers. There was a good picture for the electrolyte and how it could not contact all the lithium "plates" when the cell was laid flat, I'll try and get this.
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Saturday, 15 October 2011

Spex

Someone has
asked for a specification / parts list so here it is


Item
Description
Cost Au $
Weight  Kgs
Size
Alltrax  AXE4834 DC Motor Controller
24-48V 300A, for Series and PM motors
$415
2.9
195 x 146 x 71
Motenergy ME0708
48V Brushless DC Motor, 6-12kW
450
15
149 D x150
Thunder Sky LFP060AHA
LiFePO4 Cell 3.2V 60Ah Pack of 16
1360
34.5
61 x 114 x 203  915
battery charger Kingpan KP4810EL(600W)
LiFePO4 Cell 3.2V 100Ah 48V 10A switchmode
225
3
220x120x70
HWZ Series DC/DC Converter
48V to 13.5V 25A
149
2
200 x 140 x 72
BMS-CM160-V6
LFP100AH BMS Cell Module x 15
195
0.225
n/a
BMS-MCU-EV2
Single channel Master Unit for Evs
179
2
170 x 100 x 75
ZJW200A Contactor
200A rated contacts, 12V coil
49
0.9
n/a
Precharge Resistor
1kohm 10W resistor with 3/8in ring terminals
4.5
0.05
n/a
ANN Fuse, 400A
For low voltage circuits (72VDC max)
13.5
0.1
n/a
Inertia Switch
Vehicle crash sensor, 8-14G
22.5
0.06
n/a
250A Emergency Disconnect Switch
Big Red Button, 250A continuous
26.5
0.5
n/a
Power Cable, 25mm² Orange
Double insulated, sold by the metre x 3mtrs
19.5
0.9
n/a
$3,109
62.135

Dummy battery packs


Photos showing mock ups of the battery pack size required to make sure all will fit.


Total of 16 60 amp hour lithium batteries stacked on the their side, each individual battery has the dimensions 203mm x 114mm x 61mm


This shows there will be 3 stacks arranged vertically. two stacks will have 6 cells and the smaller stack at the back will have 4 cells 





The foam block at the base shows the size of the Altrax controller